Rename import due to dexon-consensus rename

101 files changed, 10200 insertions, 423 deletions

diff --git a/cmd/monkey/monkey.go b/cmd/monkey/monkey.go
index 76a306c7a..8655b99e8 100644
--- a/cmd/monkey/monkey.go
+++ b/cmd/monkey/monkey.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 // A simple monkey that sends random transactions into the network.
diff --git a/core/blockchain.go b/core/blockchain.go
index 8b5670081..953e461b1 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -28,8 +28,8 @@ import (
 	"sync/atomic"
 	"time"
 
-	coreCommon "github.com/dexon-foundation/dexon-consensus-core/common"
-	coreTypes "github.com/dexon-foundation/dexon-consensus-core/core/types"
+	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
 	"github.com/hashicorp/golang-lru"
 
 	"github.com/dexon-foundation/dexon/common"
diff --git a/core/vm/governance.go b/core/vm/governance.go
index b36c01e43..6ab6f173e 100644
--- a/core/vm/governance.go
+++ b/core/vm/governance.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package vm
@@ -28,12 +28,12 @@ import (
 	"github.com/dexon-foundation/dexon/params"
 	"github.com/dexon-foundation/dexon/rlp"
 
-	coreCommon "github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core"
-	coreCrypto "github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa"
-	coreTypes "github.com/dexon-foundation/dexon-consensus-core/core/types"
-	dkgTypes "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core"
+	coreCrypto "github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa"
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
+	dkgTypes "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 )
 
 var GovernanceContractAddress = common.HexToAddress("5765692d4e696e6720536f6e696320426f6a6965")
diff --git a/core/vm/governance_test.go b/core/vm/governance_test.go
index 5f6d38a50..ebdca7fd8 100644
--- a/core/vm/governance_test.go
+++ b/core/vm/governance_test.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package vm
diff --git a/dex/app.go b/dex/app.go
index a3bc9f4c5..82e230299 100644
--- a/dex/app.go
+++ b/dex/app.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package dex
@@ -23,8 +23,8 @@ import (
 	"sync"
 	"time"
 
-	coreCommon "github.com/dexon-foundation/dexon-consensus-core/common"
-	coreTypes "github.com/dexon-foundation/dexon-consensus-core/core/types"
+	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
 
 	"github.com/dexon-foundation/dexon/common"
 	"github.com/dexon-foundation/dexon/core"
diff --git a/dex/backend.go b/dex/backend.go
index 2ad7c16be..3a50eb649 100644
--- a/dex/backend.go
+++ b/dex/backend.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package dex
@@ -22,10 +22,10 @@ import (
 	"path/filepath"
 	"time"
 
-	dexCore "github.com/dexon-foundation/dexon-consensus-core/core"
-	"github.com/dexon-foundation/dexon-consensus-core/core/blockdb"
-	coreEcdsa "github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa"
-	coreTypes "github.com/dexon-foundation/dexon-consensus-core/core/types"
+	dexCore "github.com/dexon-foundation/dexon-consensus/core"
+	"github.com/dexon-foundation/dexon-consensus/core/blockdb"
+	coreEcdsa "github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa"
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
 
 	"github.com/dexon-foundation/dexon/accounts"
 	"github.com/dexon-foundation/dexon/consensus"
diff --git a/dex/cache.go b/dex/cache.go
index f373a642e..e56e706f9 100644
--- a/dex/cache.go
+++ b/dex/cache.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package dex
@@ -20,8 +20,8 @@ package dex
 import (
 	"sync"
 
-	coreCommon "github.com/dexon-foundation/dexon-consensus-core/common"
-	coreTypes "github.com/dexon-foundation/dexon-consensus-core/core/types"
+	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 type voteKey struct {
diff --git a/dex/cache_test.go b/dex/cache_test.go
index 96e07aa17..0ab426f3a 100644
--- a/dex/cache_test.go
+++ b/dex/cache_test.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package dex
@@ -20,8 +20,8 @@ package dex
 import (
 	"testing"
 
-	coreCommon "github.com/dexon-foundation/dexon-consensus-core/common"
-	coreTypes "github.com/dexon-foundation/dexon-consensus-core/core/types"
+	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 func TestCacheVote(t *testing.T) {
diff --git a/dex/governance.go b/dex/governance.go
index bbb34ca50..61dddf0e6 100644
--- a/dex/governance.go
+++ b/dex/governance.go
@@ -7,12 +7,12 @@ import (
 	"math/big"
 	"time"
 
-	coreCommon "github.com/dexon-foundation/dexon-consensus-core/common"
-	dexCore "github.com/dexon-foundation/dexon-consensus-core/core"
-	coreCrypto "github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	coreEcdsa "github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa"
-	coreTypes "github.com/dexon-foundation/dexon-consensus-core/core/types"
-	dkgTypes "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
+	dexCore "github.com/dexon-foundation/dexon-consensus/core"
+	coreCrypto "github.com/dexon-foundation/dexon-consensus/core/crypto"
+	coreEcdsa "github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa"
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
+	dkgTypes "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 
 	"github.com/dexon-foundation/dexon/common"
 	"github.com/dexon-foundation/dexon/core/types"
diff --git a/dex/handler.go b/dex/handler.go
index 5662e2b84..68c682eda 100644
--- a/dex/handler.go
+++ b/dex/handler.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 // Copyright 2015 The go-ethereum Authors
@@ -43,10 +43,10 @@ import (
 	"sync/atomic"
 	"time"
 
-	coreCommon "github.com/dexon-foundation/dexon-consensus-core/common"
-	coreCrypto "github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	coreTypes "github.com/dexon-foundation/dexon-consensus-core/core/types"
-	dkgTypes "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
+	coreCrypto "github.com/dexon-foundation/dexon-consensus/core/crypto"
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
+	dkgTypes "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 
 	"github.com/dexon-foundation/dexon/common"
 	"github.com/dexon-foundation/dexon/consensus"
@@ -941,7 +941,7 @@ func (pm *ProtocolManager) BroadcastRandomnessResult(
 }
 
 func (pm *ProtocolManager) SendDKGPrivateShare(
-	pub coreCrypto.PublicKey, privateShare *coreTypes.DKGPrivateShare) {
+	pub coreCrypto.PublicKey, privateShare *dkgTypes.PrivateShare) {
 	id := string(pub.Bytes()[1:])
 	if p := pm.peers.Peer(id); p != nil {
 		p.AsyncSendDKGPrivateShare(privateShare)
diff --git a/dex/network.go b/dex/network.go
index 4f5c5ac5c..38ee614ad 100644
--- a/dex/network.go
+++ b/dex/network.go
@@ -1,27 +1,27 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package dex
 
 import (
-	coreCommon "github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
-	dkgTypes "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	dkgTypes "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 )
 
 type DexconNetwork struct {
diff --git a/dex/peer.go b/dex/peer.go
index 2fe8cac08..b350412f3 100644
--- a/dex/peer.go
+++ b/dex/peer.go
@@ -24,9 +24,9 @@ import (
 	"time"
 
 	mapset "github.com/deckarep/golang-set"
-	coreCommon "github.com/dexon-foundation/dexon-consensus-core/common"
-	coreTypes "github.com/dexon-foundation/dexon-consensus-core/core/types"
-	dkgTypes "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
+	dkgTypes "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 
 	"github.com/dexon-foundation/dexon/common"
 	"github.com/dexon-foundation/dexon/core/types"
diff --git a/dex/protocol.go b/dex/protocol.go
index f33179b69..aabce3bf9 100644
--- a/dex/protocol.go
+++ b/dex/protocol.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 // Copyright 2014 The go-ethereum Authors
diff --git a/dex/protocol_test.go b/dex/protocol_test.go
index 55d7abc69..2e9ba3470 100644
--- a/dex/protocol_test.go
+++ b/dex/protocol_test.go
@@ -23,11 +23,11 @@ import (
 	"testing"
 	"time"
 
-	coreCommon "github.com/dexon-foundation/dexon-consensus-core/common"
-	coreCrypto "github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg"
-	coreTypes "github.com/dexon-foundation/dexon-consensus-core/core/types"
-	dkgTypes "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
+	coreCrypto "github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto/dkg"
+	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
+	dkgTypes "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 
 	"github.com/dexon-foundation/dexon/common"
 	"github.com/dexon-foundation/dexon/core/types"
diff --git a/test/sync_core.sh b/test/sync_core.sh
index 13f78c2aa..5e09c47cc 100755
--- a/test/sync_core.sh
+++ b/test/sync_core.sh
@@ -1,3 +1,3 @@
 #!/bin/bash
 
-govendor fetch github.com/dexon-foundation/dexon-consensus-core/...
+govendor fetch github.com/dexon-foundation/dexon-consensus/...
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/common/event.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/common/event.go
index dab34a5f6..6c6bf49d4 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/common/event.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/common/event.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package common
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/common/logger.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/common/logger.go
index 9dc5d231c..2eb1e2bd0 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/common/logger.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/common/logger.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package common
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/common/types.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/common/types.go
index f51a51953..a5dfab10e 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/common/types.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/common/types.go
@@ -1,35 +1,35 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it and/or
+// The dexon-consensus library is free software: you can redistribute it and/or
 // modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be useful,
+// The dexon-consensus library is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 // GNU Lesser General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package common
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/agreement-state.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/agreement-state.go
index 4997ddcf3..77569d549 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/agreement-state.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/agreement-state.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -20,8 +20,8 @@ package core
 import (
 	"fmt"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 // Errors for agreement state module.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/agreement.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/agreement.go
index 72aefc6b2..8741baf10 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/agreement.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/agreement.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -23,8 +23,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 // Errors for agreement module.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/authenticator.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/authenticator.go
index 60a4cf847..5d176cfee 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/authenticator.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/authenticator.go
@@ -1,27 +1,27 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
 
 import (
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
-	typesDKG "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 )
 
 // Authenticator verify data owner.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/interfaces.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/interfaces.go
index fd176bc11..c85630775 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/interfaces.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/interfaces.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package blockdb
@@ -21,8 +21,8 @@ import (
 	"errors"
 	"fmt"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 var (
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/level-db.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/level-db.go
index 79099c0f1..76730fc9c 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/level-db.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/level-db.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package blockdb
@@ -22,8 +22,8 @@ import (
 
 	"github.com/syndtr/goleveldb/leveldb"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 // LevelDBBackedBlockDB is a leveldb backed BlockDB implementation.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/memory.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/memory.go
index eeda47772..760646e10 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/memory.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockdb/memory.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package blockdb
@@ -23,8 +23,8 @@ import (
 	"os"
 	"sync"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 type seqIterator struct {
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockpool.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockpool.go
index 60b8f5dcd..261966719 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockpool.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/blockpool.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -20,7 +20,7 @@ package core
 import (
 	"container/heap"
 
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 // blockPool is a slice of heap of blocks, indexed by chainID,
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/compaction-chain.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/compaction-chain.go
index 50056a9d8..65592f1d0 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/compaction-chain.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/compaction-chain.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -22,9 +22,9 @@ import (
 	"fmt"
 	"sync"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 // Errors for compaction chain module.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/configuration-chain.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/configuration-chain.go
index bf24c31dc..5e5a587cb 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/configuration-chain.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/configuration-chain.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -22,10 +22,10 @@ import (
 	"sync"
 	"time"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
-	typesDKG "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 )
 
 // Errors for configuration chain..
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/consensus-timestamp.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/consensus-timestamp.go
index 03a6f10d7..9750a74c3 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/consensus-timestamp.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/consensus-timestamp.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -21,7 +21,7 @@ import (
 	"errors"
 	"time"
 
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 // consensusTimestamp is for Concensus Timestamp Algorithm.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/consensus.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/consensus.go
index 525616892..7e6934f45 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/consensus.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/consensus.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -24,11 +24,11 @@ import (
 	"sync"
 	"time"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/blockdb"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
-	typesDKG "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/blockdb"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 )
 
 // Errors for consensus core.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto.go
index 52f1c9167..2b7f7a7fc 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -20,10 +20,10 @@ package core
 import (
 	"encoding/binary"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
-	typesDKG "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 )
 
 func hashWitness(witness *types.Witness) (common.Hash, error) {
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/constant.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/constant.go
index 91453912f..3e7ef4574 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/constant.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/constant.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package dkg
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/dkg.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/dkg.go
index fca3fcd96..5be16847d 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/dkg.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/dkg.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package dkg
@@ -25,8 +25,8 @@ import (
 	"github.com/dexon-foundation/bls/ffi/go/bls"
 	"github.com/dexon-foundation/dexon/rlp"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
 )
 
 var (
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/utils.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/utils.go
index f8d11b3c9..fa4ad9f05 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/utils.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg/utils.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package dkg
@@ -22,7 +22,7 @@ import (
 
 	"github.com/dexon-foundation/bls/ffi/go/bls"
 
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
 )
 
 // PartialSignature is a partial signature in DKG+TSIG protocol.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa/ecdsa.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa/ecdsa.go
index 49d5b28a2..82e4dca4b 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa/ecdsa.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa/ecdsa.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package ecdsa
@@ -22,8 +22,8 @@ import (
 
 	dexCrypto "github.com/dexon-foundation/dexon/crypto"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
 )
 
 const cryptoType = "ecdsa"
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/interfaces.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/interfaces.go
index fb1dcbe80..f3e01e42c 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/interfaces.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/interfaces.go
@@ -1,24 +1,24 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package crypto
 
 import (
-	"github.com/dexon-foundation/dexon-consensus-core/common"
+	"github.com/dexon-foundation/dexon-consensus/common"
 )
 
 // Signature is the basic signature type in DEXON.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/utils.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/utils.go
index d56c28a41..59e91f5a5 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/utils.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/crypto/utils.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package crypto
@@ -23,7 +23,7 @@ import (
 
 	"github.com/dexon-foundation/dexon/crypto"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
+	"github.com/dexon-foundation/dexon-consensus/common"
 )
 
 var (
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/dkg-tsig-protocol.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/dkg-tsig-protocol.go
index e3fdbccf3..6645ecbae 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/dkg-tsig-protocol.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/dkg-tsig-protocol.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -21,11 +21,11 @@ import (
 	"fmt"
 	"sync"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
-	typesDKG "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto/dkg"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 )
 
 // Errors for dkg module.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/interfaces.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/interfaces.go
index d6c1baf3e..75a2fdfcf 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/interfaces.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/interfaces.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -20,10 +20,10 @@ package core
 import (
 	"time"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
-	typesDKG "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 )
 
 // Application describes the application interface that interacts with DEXON
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/lattice-data.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/lattice-data.go
index dd0b534b5..564675730 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/lattice-data.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/lattice-data.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -23,9 +23,9 @@ import (
 	"sort"
 	"time"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/blockdb"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/blockdb"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 // Errors for sanity check error.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/lattice.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/lattice.go
index c1339beed..af9c3c42f 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/lattice.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/lattice.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -22,9 +22,9 @@ import (
 	"sync"
 	"time"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/blockdb"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/blockdb"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 // Errors for sanity check error.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/leader-selector.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/leader-selector.go
index bfaa19c11..2be596abc 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/leader-selector.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/leader-selector.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -22,9 +22,9 @@ import (
 	"math/big"
 	"sync"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 // Errors for leader module.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/negative-ack.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/negative-ack.go
index 89571529c..417862912 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/negative-ack.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/negative-ack.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it and/or
+// The dexon-consensus library is free software: you can redistribute it and/or
 // modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be useful,
+// The dexon-consensus library is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 // GNU Lesser General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -20,7 +20,7 @@ package core
 import (
 	"time"
 
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 type negativeAck struct {
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/nodeset-cache.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/nodeset-cache.go
index 5b9f25c14..bf7b88d89 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/nodeset-cache.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/nodeset-cache.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -21,9 +21,9 @@ import (
 	"errors"
 	"sync"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 var (
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/nonblocking.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/nonblocking.go
index 36135fdd9..fafbd10bb 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/nonblocking.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/nonblocking.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -21,8 +21,8 @@ import (
 	"fmt"
 	"sync"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 type blockConfirmedEvent struct {
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/round-based-config.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/round-based-config.go
index 24ade494f..580b65e1c 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/round-based-config.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/round-based-config.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -20,7 +20,7 @@ package core
 import (
 	"time"
 
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 type roundBasedConfig struct {
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/ticker.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/ticker.go
index 0d2e433ff..3728a79e6 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/ticker.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/ticker.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/total-ordering-syncer.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/total-ordering-syncer.go
index 270e637e0..aa90a1ded 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/total-ordering-syncer.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/total-ordering-syncer.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -21,8 +21,8 @@ import (
 	"sort"
 	"sync"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 type totalOrderingSyncer struct {
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/total-ordering.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/total-ordering.go
index 480cdd4b4..a4778f593 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/total-ordering.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/total-ordering.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -24,8 +24,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 const (
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/block-randomness.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/block-randomness.go
index ebffd2b22..1eaa3e398 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/block-randomness.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/block-randomness.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package types
@@ -20,7 +20,7 @@ package types
 import (
 	"fmt"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
+	"github.com/dexon-foundation/dexon-consensus/common"
 )
 
 // AgreementResult describes an agremeent result.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/block.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/block.go
index 008805743..bde07d518 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/block.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/block.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 // TODO(jimmy-dexon): remove comments of WitnessAck before open source.
@@ -29,8 +29,8 @@ import (
 
 	"github.com/dexon-foundation/dexon/rlp"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
 )
 
 // BlockVerifyStatus is the return code for core.Application.VerifyBlock
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/config.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/config.go
index df28b2055..975eec9cb 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/config.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/config.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package types
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/dkg/dkg.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/dkg/dkg.go
index ee00f140f..4053c5a28 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/dkg/dkg.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/dkg/dkg.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package dkg
@@ -25,10 +25,10 @@ import (
 
 	"github.com/dexon-foundation/dexon/rlp"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	cryptoDKG "github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	cryptoDKG "github.com/dexon-foundation/dexon-consensus/core/crypto/dkg"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 // PrivateShare describe a secret share in DKG protocol.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/node.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/node.go
index 839c2bf3b..2c90f65c8 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/node.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/node.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package types
@@ -20,8 +20,8 @@ package types
 import (
 	"bytes"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
 )
 
 // NodeID is the ID type for nodes.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/nodeset.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/nodeset.go
index eb83f19ab..3222b3c2f 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/nodeset.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/nodeset.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package types
@@ -22,8 +22,8 @@ import (
 	"encoding/binary"
 	"math/big"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
 )
 
 // NodeSet is the node set structure as defined in DEXON consensus core.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/position.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/position.go
index 8e7e85298..404f3035e 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/position.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/position.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package types
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/vote.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/vote.go
index bbf2f266b..32fb8982d 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/vote.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/types/vote.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package types
@@ -20,8 +20,8 @@ package types
 import (
 	"fmt"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
 )
 
 // VoteType is the type of vote.
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/utils.go b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/utils.go
index 38e874606..6b9ce634f 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus-core/core/utils.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus-core/core/utils.go
@@ -1,18 +1,18 @@
-// Copyright 2018 The dexon-consensus-core Authors
-// This file is part of the dexon-consensus-core library.
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
 //
-// The dexon-consensus-core library is free software: you can redistribute it
+// The dexon-consensus library is free software: you can redistribute it
 // and/or modify it under the terms of the GNU Lesser General Public License as
 // published by the Free Software Foundation, either version 3 of the License,
 // or (at your option) any later version.
 //
-// The dexon-consensus-core library is distributed in the hope that it will be
+// The dexon-consensus library is distributed in the hope that it will be
 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 // General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus-core library. If not, see
+// along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
 package core
@@ -24,9 +24,9 @@ import (
 	"sort"
 	"time"
 
-	"github.com/dexon-foundation/dexon-consensus-core/common"
-	"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
 )
 
 var (
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/common/event.go b/vendor/github.com/dexon-foundation/dexon-consensus/common/event.go
new file mode 100644
index 000000000..6c6bf49d4
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/common/event.go
@@ -0,0 +1,102 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package common
+
+import (
+	"container/heap"
+	"sync"
+	"time"
+)
+
+type timeEventFn func(time.Time)
+
+type timeEvent struct {
+	t  time.Time
+	fn timeEventFn
+}
+
+// timeEvents implements a Min-Heap structure.
+type timeEvents []timeEvent
+
+func (h timeEvents) Len() int           { return len(h) }
+func (h timeEvents) Less(i, j int) bool { return h[i].t.Before(h[j].t) }
+func (h timeEvents) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
+func (h *timeEvents) Push(x interface{}) {
+	*h = append(*h, x.(timeEvent))
+}
+func (h *timeEvents) Pop() interface{} {
+	old := *h
+	n := len(old)
+	x := old[n-1]
+	*h = old[0 : n-1]
+	return x
+}
+
+// Event implements the Observer pattern.
+type Event struct {
+	timeEvents     timeEvents
+	timeEventsLock sync.Mutex
+}
+
+// NewEvent creates a new event instance.
+func NewEvent() *Event {
+	te := timeEvents{}
+	heap.Init(&te)
+	return &Event{
+		timeEvents: te,
+	}
+}
+
+// RegisterTime to get notified on and after specific time.
+func (e *Event) RegisterTime(t time.Time, fn timeEventFn) {
+	e.timeEventsLock.Lock()
+	defer e.timeEventsLock.Unlock()
+	heap.Push(&e.timeEvents, timeEvent{
+		t:  t,
+		fn: fn,
+	})
+}
+
+// NotifyTime and trigger function callback.
+func (e *Event) NotifyTime(t time.Time) {
+	fns := func() (fns []timeEventFn) {
+		e.timeEventsLock.Lock()
+		defer e.timeEventsLock.Unlock()
+		if len(e.timeEvents) == 0 {
+			return
+		}
+		for !t.Before(e.timeEvents[0].t) {
+			te := heap.Pop(&e.timeEvents).(timeEvent)
+			fns = append(fns, te.fn)
+			if len(e.timeEvents) == 0 {
+				return
+			}
+		}
+		return
+	}()
+	for _, fn := range fns {
+		fn(t)
+	}
+}
+
+// Reset clears all pending event
+func (e *Event) Reset() {
+	e.timeEventsLock.Lock()
+	defer e.timeEventsLock.Unlock()
+	e.timeEvents = timeEvents{}
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/common/logger.go b/vendor/github.com/dexon-foundation/dexon-consensus/common/logger.go
new file mode 100644
index 000000000..2eb1e2bd0
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/common/logger.go
@@ -0,0 +1,87 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package common
+
+import "log"
+
+// Logger define the way to receive logs from Consensus instance.
+// NOTE: parameter in 'ctx' should be paired as key-value mapping. For example,
+//       to log an error with message:
+//           logger.Error("some message", "error", err)
+//       which is similar to loggers with context:
+//           logger.Error("some message", map[string]interface{}{
+//              "error": err,
+//           })
+type Logger interface {
+	// Info logs info level logs.
+	Debug(msg string, ctx ...interface{})
+	Info(msg string, ctx ...interface{})
+	Warn(msg string, ctx ...interface{})
+	Error(msg string, ctx ...interface{})
+}
+
+// NullLogger logs nothing.
+type NullLogger struct{}
+
+// Debug implements Logger interface.
+func (logger *NullLogger) Debug(msg string, ctx ...interface{}) {
+}
+
+// Info implements Logger interface.
+func (logger *NullLogger) Info(msg string, ctx ...interface{}) {
+}
+
+// Warn implements Logger interface.
+func (logger *NullLogger) Warn(msg string, ctx ...interface{}) {
+}
+
+// Error implements Logger interface.
+func (logger *NullLogger) Error(msg string, ctx ...interface{}) {
+}
+
+// SimpleLogger logs everything.
+type SimpleLogger struct{}
+
+// composeVargs makes (msg, ctx...) could be pass to log.Println
+func composeVargs(msg string, ctxs []interface{}) []interface{} {
+	args := []interface{}{msg}
+	for _, c := range ctxs {
+		args = append(args, c)
+	}
+	return args
+}
+
+// Debug implements Logger interface.
+func (logger *SimpleLogger) Debug(msg string, ctx ...interface{}) {
+	log.Println(composeVargs(msg, ctx)...)
+}
+
+// Info implements Logger interface.
+func (logger *SimpleLogger) Info(msg string, ctx ...interface{}) {
+	log.Println(composeVargs(msg, ctx)...)
+}
+
+// Warn implements Logger interface.
+func (logger *SimpleLogger) Warn(msg string, ctx ...interface{}) {
+	log.Println(composeVargs(msg, ctx)...)
+}
+
+// Error implements Logger interface.
+func (logger *SimpleLogger) Error(msg string, ctx ...interface{}) {
+	log.Println(composeVargs(msg, ctx)...)
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/common/types.go b/vendor/github.com/dexon-foundation/dexon-consensus/common/types.go
new file mode 100644
index 000000000..a5dfab10e
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/common/types.go
@@ -0,0 +1,107 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package common
+
+import (
+	"bytes"
+	"encoding/hex"
+	"sort"
+	"time"
+)
+
+const (
+	// HashLength is the length of a hash in DEXON.
+	HashLength = 32
+)
+
+// Hash is the basic hash type in DEXON.
+type Hash [HashLength]byte
+
+func (h Hash) String() string {
+	return hex.EncodeToString([]byte(h[:]))
+}
+
+// Bytes return the hash as slice of bytes.
+func (h Hash) Bytes() []byte {
+	return h[:]
+}
+
+// Equal compares if two hashes are the same.
+func (h Hash) Equal(hp Hash) bool {
+	return h == hp
+}
+
+// Less compares if current hash is lesser.
+func (h Hash) Less(hp Hash) bool {
+	return bytes.Compare(h[:], hp[:]) < 0
+}
+
+// MarshalText implements the encoding.TextMarhsaler interface.
+func (h Hash) MarshalText() ([]byte, error) {
+	result := make([]byte, hex.EncodedLen(HashLength))
+	hex.Encode(result, h[:])
+	return result, nil
+}
+
+// UnmarshalText implements the encoding.TextUnmarshaler interface.
+func (h *Hash) UnmarshalText(text []byte) error {
+	_, err := hex.Decode(h[:], text)
+	return err
+}
+
+// Hashes is for sorting hashes.
+type Hashes []Hash
+
+func (hs Hashes) Len() int           { return len(hs) }
+func (hs Hashes) Less(i, j int) bool { return hs[i].Less(hs[j]) }
+func (hs Hashes) Swap(i, j int)      { hs[i], hs[j] = hs[j], hs[i] }
+
+// SortedHashes is a slice of hashes sorted in ascending order.
+type SortedHashes Hashes
+
+// NewSortedHashes converts a slice of hashes to a sorted one. It's a
+// firewall to prevent us from assigning unsorted hashes to a variable
+// declared as SortedHashes directly.
+func NewSortedHashes(hs Hashes) SortedHashes {
+	sort.Sort(hs)
+	return SortedHashes(hs)
+}
+
+// ByTime implements sort.Interface for time.Time.
+type ByTime []time.Time
+
+func (t ByTime) Len() int           { return len(t) }
+func (t ByTime) Swap(i, j int)      { t[i], t[j] = t[j], t[i] }
+func (t ByTime) Less(i, j int) bool { return t[i].Before(t[j]) }
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/common/utils.go b/vendor/github.com/dexon-foundation/dexon-consensus/common/utils.go
new file mode 100644
index 000000000..7e89c059d
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/common/utils.go
@@ -0,0 +1,14 @@
+package common
+
+import (
+	"math/rand"
+)
+
+// NewRandomHash returns a random Hash-like value.
+func NewRandomHash() Hash {
+	x := Hash{}
+	for i := 0; i < HashLength; i++ {
+		x[i] = byte(rand.Int() % 256)
+	}
+	return x
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement-state.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement-state.go
new file mode 100644
index 000000000..77569d549
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement-state.go
@@ -0,0 +1,170 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"fmt"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+// Errors for agreement state module.
+var (
+	ErrNoEnoughVoteInPrepareState = fmt.Errorf("no enough vote in prepare state")
+	ErrNoEnoughVoteInAckState     = fmt.Errorf("no enough vote in ack state")
+)
+
+// agreementStateType is the state of agreement
+type agreementStateType int
+
+// agreementStateType enum.
+const (
+	stateInitial agreementStateType = iota
+	statePreCommit
+	stateCommit
+	stateForward
+	statePullVote
+)
+
+var nullBlockHash = common.Hash{}
+var skipBlockHash common.Hash
+
+func init() {
+	for idx := range skipBlockHash {
+		skipBlockHash[idx] = 0xff
+	}
+}
+
+type agreementState interface {
+	state() agreementStateType
+	nextState() (agreementState, error)
+	clocks() int
+}
+
+//----- InitialState -----
+type initialState struct {
+	a *agreementData
+}
+
+func newInitialState(a *agreementData) *initialState {
+	return &initialState{a: a}
+}
+
+func (s *initialState) state() agreementStateType { return stateInitial }
+func (s *initialState) clocks() int               { return 0 }
+func (s *initialState) nextState() (agreementState, error) {
+	hash := s.a.recv.ProposeBlock()
+	s.a.lock.Lock()
+	defer s.a.lock.Unlock()
+	s.a.recv.ProposeVote(&types.Vote{
+		Type:      types.VoteInit,
+		BlockHash: hash,
+		Period:    s.a.period,
+	})
+	return newPreCommitState(s.a), nil
+}
+
+//----- PreCommitState -----
+type preCommitState struct {
+	a *agreementData
+}
+
+func newPreCommitState(a *agreementData) *preCommitState {
+	return &preCommitState{a: a}
+}
+
+func (s *preCommitState) state() agreementStateType { return statePreCommit }
+func (s *preCommitState) clocks() int               { return 2 }
+func (s *preCommitState) nextState() (agreementState, error) {
+	s.a.lock.RLock()
+	defer s.a.lock.RUnlock()
+	hash := s.a.lockValue
+	if hash == nullBlockHash {
+		hash = s.a.leader.leaderBlockHash()
+	}
+	s.a.recv.ProposeVote(&types.Vote{
+		Type:      types.VotePreCom,
+		BlockHash: hash,
+		Period:    s.a.period,
+	})
+	return newCommitState(s.a), nil
+}
+
+//----- CommitState -----
+type commitState struct {
+	a *agreementData
+}
+
+func newCommitState(a *agreementData) *commitState {
+	return &commitState{a: a}
+}
+
+func (s *commitState) state() agreementStateType { return stateCommit }
+func (s *commitState) clocks() int               { return 2 }
+func (s *commitState) nextState() (agreementState, error) {
+	hash, ok := s.a.countVote(s.a.period, types.VotePreCom)
+	s.a.lock.Lock()
+	defer s.a.lock.Unlock()
+	if ok && hash != skipBlockHash {
+		s.a.lockValue = hash
+		s.a.lockRound = s.a.period
+	} else {
+		hash = skipBlockHash
+	}
+	s.a.recv.ProposeVote(&types.Vote{
+		Type:      types.VoteCom,
+		BlockHash: hash,
+		Period:    s.a.period,
+	})
+	return newForwardState(s.a), nil
+}
+
+// ----- ForwardState -----
+type forwardState struct {
+	a *agreementData
+}
+
+func newForwardState(a *agreementData) *forwardState {
+	return &forwardState{a: a}
+}
+
+func (s *forwardState) state() agreementStateType { return stateForward }
+func (s *forwardState) clocks() int               { return 4 }
+
+func (s *forwardState) nextState() (agreementState, error) {
+	return newPullVoteState(s.a), nil
+}
+
+// ----- PullVoteState -----
+// pullVoteState is a special state to ensure the assumption in the consensus
+// algorithm that every vote will eventually arrive for all nodes.
+type pullVoteState struct {
+	a *agreementData
+}
+
+func newPullVoteState(a *agreementData) *pullVoteState {
+	return &pullVoteState{a: a}
+}
+
+func (s *pullVoteState) state() agreementStateType { return statePullVote }
+func (s *pullVoteState) clocks() int               { return 4 }
+
+func (s *pullVoteState) nextState() (agreementState, error) {
+	return s, nil
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement.go
new file mode 100644
index 000000000..8741baf10
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement.go
@@ -0,0 +1,492 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"fmt"
+	"math"
+	"sync"
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+// Errors for agreement module.
+var (
+	ErrNotInNotarySet         = fmt.Errorf("not in notary set")
+	ErrIncorrectVoteSignature = fmt.Errorf("incorrect vote signature")
+)
+
+// ErrFork for fork error in agreement.
+type ErrFork struct {
+	nID      types.NodeID
+	old, new common.Hash
+}
+
+func (e *ErrFork) Error() string {
+	return fmt.Sprintf("fork is found for %s, old %s, new %s",
+		e.nID.String(), e.old, e.new)
+}
+
+// ErrForkVote for fork vote error in agreement.
+type ErrForkVote struct {
+	nID      types.NodeID
+	old, new *types.Vote
+}
+
+func (e *ErrForkVote) Error() string {
+	return fmt.Sprintf("fork vote is found for %s, old %s, new %s",
+		e.nID.String(), e.old, e.new)
+}
+
+func newVoteListMap() []map[types.NodeID]*types.Vote {
+	listMap := make([]map[types.NodeID]*types.Vote, types.MaxVoteType)
+	for idx := range listMap {
+		listMap[idx] = make(map[types.NodeID]*types.Vote)
+	}
+	return listMap
+}
+
+// agreementReceiver is the interface receiving agreement event.
+type agreementReceiver interface {
+	ProposeVote(vote *types.Vote)
+	ProposeBlock() common.Hash
+	// ConfirmBlock is called with lock hold. User can safely use all data within
+	// agreement module.
+	ConfirmBlock(common.Hash, map[types.NodeID]*types.Vote)
+	PullBlocks(common.Hashes)
+}
+
+type pendingBlock struct {
+	block        *types.Block
+	receivedTime time.Time
+}
+
+type pendingVote struct {
+	vote         *types.Vote
+	receivedTime time.Time
+}
+
+// agreementData is the data for agreementState.
+type agreementData struct {
+	recv agreementReceiver
+
+	ID           types.NodeID
+	leader       *leaderSelector
+	lockValue    common.Hash
+	lockRound    uint64
+	period       uint64
+	requiredVote int
+	votes        map[uint64][]map[types.NodeID]*types.Vote
+	lock         sync.RWMutex
+	blocks       map[types.NodeID]*types.Block
+	blocksLock   sync.Mutex
+}
+
+// agreement is the agreement protocal describe in the Crypto Shuffle Algorithm.
+type agreement struct {
+	state          agreementState
+	data           *agreementData
+	aID            types.Position
+	notarySet      map[types.NodeID]struct{}
+	hasOutput      bool
+	lock           sync.RWMutex
+	pendingBlock   []pendingBlock
+	pendingVote    []pendingVote
+	candidateBlock map[common.Hash]*types.Block
+	fastForward    chan uint64
+	authModule     *Authenticator
+}
+
+// newAgreement creates a agreement instance.
+func newAgreement(
+	ID types.NodeID,
+	recv agreementReceiver,
+	notarySet map[types.NodeID]struct{},
+	leader *leaderSelector,
+	authModule *Authenticator) *agreement {
+	agreement := &agreement{
+		data: &agreementData{
+			recv:   recv,
+			ID:     ID,
+			leader: leader,
+		},
+		candidateBlock: make(map[common.Hash]*types.Block),
+		fastForward:    make(chan uint64, 1),
+		authModule:     authModule,
+	}
+	agreement.stop()
+	return agreement
+}
+
+// restart the agreement
+func (a *agreement) restart(
+	notarySet map[types.NodeID]struct{}, aID types.Position) {
+
+	func() {
+		a.lock.Lock()
+		defer a.lock.Unlock()
+		a.data.lock.Lock()
+		defer a.data.lock.Unlock()
+		a.data.blocksLock.Lock()
+		defer a.data.blocksLock.Unlock()
+		a.data.votes = make(map[uint64][]map[types.NodeID]*types.Vote)
+		a.data.votes[1] = newVoteListMap()
+		a.data.period = 1
+		a.data.blocks = make(map[types.NodeID]*types.Block)
+		a.data.requiredVote = len(notarySet)/3*2 + 1
+		a.data.leader.restart()
+		a.data.lockValue = nullBlockHash
+		a.data.lockRound = 1
+		a.fastForward = make(chan uint64, 1)
+		a.hasOutput = false
+		a.state = newInitialState(a.data)
+		a.notarySet = notarySet
+		a.candidateBlock = make(map[common.Hash]*types.Block)
+		a.aID = *aID.Clone()
+	}()
+
+	if isStop(aID) {
+		return
+	}
+
+	expireTime := time.Now().Add(-10 * time.Second)
+	replayBlock := make([]*types.Block, 0)
+	func() {
+		a.lock.Lock()
+		defer a.lock.Unlock()
+		newPendingBlock := make([]pendingBlock, 0)
+		for _, pending := range a.pendingBlock {
+			if aID.Newer(&pending.block.Position) {
+				continue
+			} else if pending.block.Position == aID {
+				replayBlock = append(replayBlock, pending.block)
+			} else if pending.receivedTime.After(expireTime) {
+				newPendingBlock = append(newPendingBlock, pending)
+			}
+		}
+		a.pendingBlock = newPendingBlock
+	}()
+
+	replayVote := make([]*types.Vote, 0)
+	func() {
+		a.lock.Lock()
+		defer a.lock.Unlock()
+		newPendingVote := make([]pendingVote, 0)
+		for _, pending := range a.pendingVote {
+			if aID.Newer(&pending.vote.Position) {
+				continue
+			} else if pending.vote.Position == aID {
+				replayVote = append(replayVote, pending.vote)
+			} else if pending.receivedTime.After(expireTime) {
+				newPendingVote = append(newPendingVote, pending)
+			}
+		}
+		a.pendingVote = newPendingVote
+	}()
+
+	for _, block := range replayBlock {
+		a.processBlock(block)
+	}
+
+	for _, vote := range replayVote {
+		a.processVote(vote)
+	}
+}
+
+func (a *agreement) stop() {
+	a.restart(make(map[types.NodeID]struct{}), types.Position{
+		ChainID: math.MaxUint32,
+	})
+}
+
+func isStop(aID types.Position) bool {
+	return aID.ChainID == math.MaxUint32
+}
+
+// clocks returns how many time this state is required.
+func (a *agreement) clocks() int {
+	return a.state.clocks()
+}
+
+// pullVotes returns if current agreement requires more votes to continue.
+func (a *agreement) pullVotes() bool {
+	return a.state.state() == statePullVote
+}
+
+// agreementID returns the current agreementID.
+func (a *agreement) agreementID() types.Position {
+	a.lock.RLock()
+	defer a.lock.RUnlock()
+	return a.aID
+}
+
+// nextState is called at the specific clock time.
+func (a *agreement) nextState() (err error) {
+	a.state, err = a.state.nextState()
+	return
+}
+
+func (a *agreement) sanityCheck(vote *types.Vote) error {
+	if _, exist := a.notarySet[vote.ProposerID]; !exist {
+		return ErrNotInNotarySet
+	}
+	ok, err := verifyVoteSignature(vote)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return ErrIncorrectVoteSignature
+	}
+	return nil
+}
+
+func (a *agreement) checkForkVote(vote *types.Vote) error {
+	if err := func() error {
+		a.data.lock.RLock()
+		defer a.data.lock.RUnlock()
+		if votes, exist := a.data.votes[vote.Period]; exist {
+			if oldVote, exist := votes[vote.Type][vote.ProposerID]; exist {
+				if vote.BlockHash != oldVote.BlockHash {
+					return &ErrForkVote{vote.ProposerID, oldVote, vote}
+				}
+			}
+		}
+		return nil
+	}(); err != nil {
+		return err
+	}
+	return nil
+}
+
+// prepareVote prepares a vote.
+func (a *agreement) prepareVote(vote *types.Vote) (err error) {
+	vote.Position = a.agreementID()
+	err = a.authModule.SignVote(vote)
+	return
+}
+
+// processVote is the entry point for processing Vote.
+func (a *agreement) processVote(vote *types.Vote) error {
+	a.lock.Lock()
+	defer a.lock.Unlock()
+	if err := a.sanityCheck(vote); err != nil {
+		return err
+	}
+	if vote.Position != a.aID {
+		// Agreement module has stopped.
+		if !isStop(a.aID) {
+			if a.aID.Newer(&vote.Position) {
+				return nil
+			}
+		}
+		a.pendingVote = append(a.pendingVote, pendingVote{
+			vote:         vote,
+			receivedTime: time.Now().UTC(),
+		})
+		return nil
+	}
+	if err := a.checkForkVote(vote); err != nil {
+		return err
+	}
+
+	a.data.lock.Lock()
+	defer a.data.lock.Unlock()
+	if _, exist := a.data.votes[vote.Period]; !exist {
+		a.data.votes[vote.Period] = newVoteListMap()
+	}
+	a.data.votes[vote.Period][vote.Type][vote.ProposerID] = vote
+	if !a.hasOutput && vote.Type == types.VoteCom {
+		if hash, ok := a.data.countVoteNoLock(vote.Period, vote.Type); ok &&
+			hash != skipBlockHash {
+			a.hasOutput = true
+			a.data.recv.ConfirmBlock(hash,
+				a.data.votes[vote.Period][types.VoteCom])
+			return nil
+		}
+	} else if a.hasOutput {
+		return nil
+	}
+
+	// Check if the agreement requires fast-forwarding.
+	if len(a.fastForward) > 0 {
+		return nil
+	}
+	if vote.Type == types.VotePreCom {
+		if hash, ok := a.data.countVoteNoLock(vote.Period, vote.Type); ok &&
+			hash != skipBlockHash {
+			// Condition 1.
+			if a.data.period >= vote.Period && vote.Period > a.data.lockRound &&
+				vote.BlockHash != a.data.lockValue {
+				a.data.lockValue = hash
+				a.data.lockRound = vote.Period
+				a.fastForward <- a.data.period + 1
+				return nil
+			}
+			// Condition 2.
+			if vote.Period > a.data.period {
+				a.data.lockValue = hash
+				a.data.lockRound = vote.Period
+				a.fastForward <- vote.Period
+				return nil
+			}
+		}
+	}
+	// Condition 3.
+	if vote.Type == types.VoteCom && vote.Period >= a.data.period &&
+		len(a.data.votes[vote.Period][types.VoteCom]) >= a.data.requiredVote {
+		hashes := common.Hashes{}
+		addPullBlocks := func(voteType types.VoteType) {
+			for _, vote := range a.data.votes[vote.Period][voteType] {
+				if vote.BlockHash == nullBlockHash || vote.BlockHash == skipBlockHash {
+					continue
+				}
+				if _, found := a.findCandidateBlockNoLock(vote.BlockHash); !found {
+					hashes = append(hashes, vote.BlockHash)
+				}
+			}
+		}
+		addPullBlocks(types.VoteInit)
+		addPullBlocks(types.VotePreCom)
+		addPullBlocks(types.VoteCom)
+		if len(hashes) > 0 {
+			a.data.recv.PullBlocks(hashes)
+		}
+		a.fastForward <- vote.Period + 1
+		return nil
+	}
+	return nil
+}
+
+func (a *agreement) done() <-chan struct{} {
+	a.lock.Lock()
+	defer a.lock.Unlock()
+	a.data.lock.Lock()
+	defer a.data.lock.Unlock()
+	ch := make(chan struct{}, 1)
+	if a.hasOutput {
+		ch <- struct{}{}
+	} else {
+		select {
+		case period := <-a.fastForward:
+			if period <= a.data.period {
+				break
+			}
+			a.data.setPeriod(period)
+			a.state = newPreCommitState(a.data)
+			ch <- struct{}{}
+		default:
+		}
+	}
+	return ch
+}
+
+// processBlock is the entry point for processing Block.
+func (a *agreement) processBlock(block *types.Block) error {
+	a.lock.Lock()
+	defer a.lock.Unlock()
+	a.data.blocksLock.Lock()
+	defer a.data.blocksLock.Unlock()
+
+	if block.Position != a.aID {
+		// Agreement module has stopped.
+		if !isStop(a.aID) {
+			if a.aID.Newer(&block.Position) {
+				return nil
+			}
+		}
+		a.pendingBlock = append(a.pendingBlock, pendingBlock{
+			block:        block,
+			receivedTime: time.Now().UTC(),
+		})
+		return nil
+	}
+	if b, exist := a.data.blocks[block.ProposerID]; exist {
+		if b.Hash != block.Hash {
+			return &ErrFork{block.ProposerID, b.Hash, block.Hash}
+		}
+		return nil
+	}
+	if err := a.data.leader.processBlock(block); err != nil {
+		return err
+	}
+	a.data.blocks[block.ProposerID] = block
+	a.addCandidateBlockNoLock(block)
+	return nil
+}
+
+func (a *agreement) addCandidateBlock(block *types.Block) {
+	a.lock.Lock()
+	defer a.lock.Unlock()
+	a.addCandidateBlockNoLock(block)
+}
+
+func (a *agreement) addCandidateBlockNoLock(block *types.Block) {
+	a.candidateBlock[block.Hash] = block
+}
+
+func (a *agreement) findCandidateBlock(hash common.Hash) (*types.Block, bool) {
+	a.lock.RLock()
+	defer a.lock.RUnlock()
+	return a.findCandidateBlockNoLock(hash)
+}
+
+func (a *agreement) findCandidateBlockNoLock(
+	hash common.Hash) (*types.Block, bool) {
+	b, e := a.candidateBlock[hash]
+	return b, e
+}
+func (a *agreementData) countVote(period uint64, voteType types.VoteType) (
+	blockHash common.Hash, ok bool) {
+	a.lock.RLock()
+	defer a.lock.RUnlock()
+	return a.countVoteNoLock(period, voteType)
+}
+
+func (a *agreementData) countVoteNoLock(
+	period uint64, voteType types.VoteType) (blockHash common.Hash, ok bool) {
+	votes, exist := a.votes[period]
+	if !exist {
+		return
+	}
+	candidate := make(map[common.Hash]int)
+	for _, vote := range votes[voteType] {
+		if _, exist := candidate[vote.BlockHash]; !exist {
+			candidate[vote.BlockHash] = 0
+		}
+		candidate[vote.BlockHash]++
+	}
+	for candidateHash, votes := range candidate {
+		if votes >= a.requiredVote {
+			blockHash = candidateHash
+			ok = true
+			return
+		}
+	}
+	return
+}
+
+func (a *agreementData) setPeriod(period uint64) {
+	for i := a.period + 1; i <= period; i++ {
+		if _, exist := a.votes[i]; !exist {
+			a.votes[i] = newVoteListMap()
+		}
+	}
+	a.period = period
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/authenticator.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/authenticator.go
new file mode 100644
index 000000000..5d176cfee
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/authenticator.go
@@ -0,0 +1,148 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
+)
+
+// Authenticator verify data owner.
+type Authenticator struct {
+	prvKey     crypto.PrivateKey
+	pubKey     crypto.PublicKey
+	proposerID types.NodeID
+}
+
+// NewAuthenticator constructs an Authenticator instance.
+func NewAuthenticator(prvKey crypto.PrivateKey) (auth *Authenticator) {
+	auth = &Authenticator{
+		prvKey: prvKey,
+		pubKey: prvKey.PublicKey(),
+	}
+	auth.proposerID = types.NewNodeID(auth.pubKey)
+	return
+}
+
+// SignBlock signs a types.Block.
+func (au *Authenticator) SignBlock(b *types.Block) (err error) {
+	b.ProposerID = au.proposerID
+	b.PayloadHash = crypto.Keccak256Hash(b.Payload)
+	if b.Hash, err = hashBlock(b); err != nil {
+		return
+	}
+	if b.Signature, err = au.prvKey.Sign(b.Hash); err != nil {
+		return
+	}
+	return
+}
+
+// SignVote signs a types.Vote.
+func (au *Authenticator) SignVote(v *types.Vote) (err error) {
+	v.ProposerID = au.proposerID
+	v.Signature, err = au.prvKey.Sign(hashVote(v))
+	return
+}
+
+// SignCRS signs CRS signature of types.Block.
+func (au *Authenticator) SignCRS(b *types.Block, crs common.Hash) (err error) {
+	if b.ProposerID != au.proposerID {
+		err = ErrInvalidProposerID
+		return
+	}
+	b.CRSSignature, err = au.prvKey.Sign(hashCRS(b, crs))
+	return
+}
+
+// SignDKGComplaint signs a DKG complaint.
+func (au *Authenticator) SignDKGComplaint(
+	complaint *typesDKG.Complaint) (err error) {
+	complaint.ProposerID = au.proposerID
+	complaint.Signature, err = au.prvKey.Sign(hashDKGComplaint(complaint))
+	return
+}
+
+// SignDKGMasterPublicKey signs a DKG master public key.
+func (au *Authenticator) SignDKGMasterPublicKey(
+	mpk *typesDKG.MasterPublicKey) (err error) {
+	mpk.ProposerID = au.proposerID
+	mpk.Signature, err = au.prvKey.Sign(hashDKGMasterPublicKey(mpk))
+	return
+}
+
+// SignDKGPrivateShare signs a DKG private share.
+func (au *Authenticator) SignDKGPrivateShare(
+	prvShare *typesDKG.PrivateShare) (err error) {
+	prvShare.ProposerID = au.proposerID
+	prvShare.Signature, err = au.prvKey.Sign(hashDKGPrivateShare(prvShare))
+	return
+}
+
+// SignDKGPartialSignature signs a DKG partial signature.
+func (au *Authenticator) SignDKGPartialSignature(
+	pSig *typesDKG.PartialSignature) (err error) {
+	pSig.ProposerID = au.proposerID
+	pSig.Signature, err = au.prvKey.Sign(hashDKGPartialSignature(pSig))
+	return
+}
+
+// SignDKGFinalize signs a DKG finalize message.
+func (au *Authenticator) SignDKGFinalize(
+	final *typesDKG.Finalize) (err error) {
+	final.ProposerID = au.proposerID
+	final.Signature, err = au.prvKey.Sign(hashDKGFinalize(final))
+	return
+}
+
+// VerifyBlock verifies the signature of types.Block.
+func (au *Authenticator) VerifyBlock(b *types.Block) (err error) {
+	payloadHash := crypto.Keccak256Hash(b.Payload)
+	if payloadHash != b.PayloadHash {
+		err = ErrIncorrectHash
+		return
+	}
+	hash, err := hashBlock(b)
+	if err != nil {
+		return
+	}
+	if hash != b.Hash {
+		err = ErrIncorrectHash
+		return
+	}
+	pubKey, err := crypto.SigToPub(b.Hash, b.Signature)
+	if err != nil {
+		return
+	}
+	if !b.ProposerID.Equal(types.NewNodeID(pubKey)) {
+		err = ErrIncorrectSignature
+		return
+	}
+	return
+}
+
+// VerifyVote verifies the signature of types.Vote.
+func (au *Authenticator) VerifyVote(v *types.Vote) (bool, error) {
+	return verifyVoteSignature(v)
+}
+
+// VerifyCRS verifies the CRS signature of types.Block.
+func (au *Authenticator) VerifyCRS(b *types.Block, crs common.Hash) (bool, error) {
+	return verifyCRSSignature(b, crs)
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/blockdb/interfaces.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/blockdb/interfaces.go
new file mode 100644
index 000000000..c85630775
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/blockdb/interfaces.go
@@ -0,0 +1,70 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package blockdb
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+var (
+	// ErrBlockExists is the error when block eixsts.
+	ErrBlockExists = errors.New("block exists")
+	// ErrBlockDoesNotExist is the error when block does not eixst.
+	ErrBlockDoesNotExist = errors.New("block does not exist")
+	// ErrIterationFinished is the error to check if the iteration is finished.
+	ErrIterationFinished = errors.New("iteration finished")
+	// ErrEmptyPath is the error when the required path is empty.
+	ErrEmptyPath = fmt.Errorf("empty path")
+	// ErrClosed is the error when using DB after it's closed.
+	ErrClosed = fmt.Errorf("db closed")
+	// ErrNotImplemented is the error that some interface is not implemented.
+	ErrNotImplemented = fmt.Errorf("not implemented")
+)
+
+// BlockDatabase is the interface for a BlockDatabase.
+type BlockDatabase interface {
+	Reader
+	Writer
+
+	// Close allows database implementation able to
+	// release resource when finishing.
+	Close() error
+}
+
+// Reader defines the interface for reading blocks into DB.
+type Reader interface {
+	Has(hash common.Hash) bool
+	Get(hash common.Hash) (types.Block, error)
+	GetAll() (BlockIterator, error)
+}
+
+// Writer defines the interface for writing blocks into DB.
+type Writer interface {
+	Update(block types.Block) error
+	Put(block types.Block) error
+}
+
+// BlockIterator defines an iterator on blocks hold
+// in a DB.
+type BlockIterator interface {
+	Next() (types.Block, error)
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/blockdb/level-db.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/blockdb/level-db.go
new file mode 100644
index 000000000..76730fc9c
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/blockdb/level-db.go
@@ -0,0 +1,127 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package blockdb
+
+import (
+	"encoding/json"
+
+	"github.com/syndtr/goleveldb/leveldb"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+// LevelDBBackedBlockDB is a leveldb backed BlockDB implementation.
+type LevelDBBackedBlockDB struct {
+	db *leveldb.DB
+}
+
+// NewLevelDBBackedBlockDB initialize a leveldb-backed block database.
+func NewLevelDBBackedBlockDB(
+	path string) (lvl *LevelDBBackedBlockDB, err error) {
+
+	db, err := leveldb.OpenFile(path, nil)
+	if err != nil {
+		return
+	}
+	lvl = &LevelDBBackedBlockDB{db: db}
+	return
+}
+
+// Close implement Closer interface, which would release allocated resource.
+func (lvl *LevelDBBackedBlockDB) Close() error {
+	return lvl.db.Close()
+}
+
+// Has implements the Reader.Has method.
+func (lvl *LevelDBBackedBlockDB) Has(hash common.Hash) bool {
+	exists, err := lvl.db.Has([]byte(hash[:]), nil)
+	if err != nil {
+		// TODO(missionliao): Modify the interface to return error.
+		panic(err)
+	}
+	return exists
+}
+
+// Get implements the Reader.Get method.
+func (lvl *LevelDBBackedBlockDB) Get(
+	hash common.Hash) (block types.Block, err error) {
+
+	queried, err := lvl.db.Get([]byte(hash[:]), nil)
+	if err != nil {
+		if err == leveldb.ErrNotFound {
+			err = ErrBlockDoesNotExist
+		}
+		return
+	}
+	err = json.Unmarshal(queried, &block)
+	if err != nil {
+		return
+	}
+	return
+}
+
+// Update implements the Writer.Update method.
+func (lvl *LevelDBBackedBlockDB) Update(block types.Block) (err error) {
+	// NOTE: we didn't handle changes of block hash (and it
+	//       should not happen).
+	marshaled, err := json.Marshal(&block)
+	if err != nil {
+		return
+	}
+
+	if !lvl.Has(block.Hash) {
+		err = ErrBlockDoesNotExist
+		return
+	}
+	err = lvl.db.Put(
+		[]byte(block.Hash[:]),
+		marshaled,
+		nil)
+	if err != nil {
+		return
+	}
+	return
+}
+
+// Put implements the Writer.Put method.
+func (lvl *LevelDBBackedBlockDB) Put(block types.Block) (err error) {
+	marshaled, err := json.Marshal(&block)
+	if err != nil {
+		return
+	}
+	if lvl.Has(block.Hash) {
+		err = ErrBlockExists
+		return
+	}
+	err = lvl.db.Put(
+		[]byte(block.Hash[:]),
+		marshaled,
+		nil)
+	if err != nil {
+		return
+	}
+	return
+}
+
+// GetAll implements Reader.GetAll method, which allows callers
+// to retrieve all blocks in DB.
+func (lvl *LevelDBBackedBlockDB) GetAll() (BlockIterator, error) {
+	// TODO (mission): Implement this part via goleveldb's iterator.
+	return nil, ErrNotImplemented
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/blockdb/memory.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/blockdb/memory.go
new file mode 100644
index 000000000..760646e10
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/blockdb/memory.go
@@ -0,0 +1,179 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package blockdb
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"os"
+	"sync"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+type seqIterator struct {
+	idx int
+	db  *MemBackedBlockDB
+}
+
+func (seq *seqIterator) Next() (types.Block, error) {
+	curIdx := seq.idx
+	seq.idx++
+	return seq.db.getByIndex(curIdx)
+}
+
+// MemBackedBlockDB is a memory backed BlockDB implementation.
+type MemBackedBlockDB struct {
+	blocksMutex        sync.RWMutex
+	blockHashSequence  common.Hashes
+	blocksByHash       map[common.Hash]*types.Block
+	persistantFilePath string
+}
+
+// NewMemBackedBlockDB initialize a memory-backed block database.
+func NewMemBackedBlockDB(persistantFilePath ...string) (db *MemBackedBlockDB, err error) {
+	db = &MemBackedBlockDB{
+		blockHashSequence: common.Hashes{},
+		blocksByHash:      make(map[common.Hash]*types.Block),
+	}
+	if len(persistantFilePath) == 0 || len(persistantFilePath[0]) == 0 {
+		return
+	}
+	db.persistantFilePath = persistantFilePath[0]
+	buf, err := ioutil.ReadFile(db.persistantFilePath)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			// Something unexpected happened.
+			return
+		}
+		// It's expected behavior that file doesn't exists, we should not
+		// report error on it.
+		err = nil
+		return
+	}
+
+	// Init this instance by file content, it's a temporary way
+	// to export those private field for JSON encoding.
+	toLoad := struct {
+		Sequence common.Hashes
+		ByHash   map[common.Hash]*types.Block
+	}{}
+	err = json.Unmarshal(buf, &toLoad)
+	if err != nil {
+		return
+	}
+	db.blockHashSequence = toLoad.Sequence
+	db.blocksByHash = toLoad.ByHash
+	return
+}
+
+// Has returns wheter or not the DB has a block identified with the hash.
+func (m *MemBackedBlockDB) Has(hash common.Hash) bool {
+	m.blocksMutex.RLock()
+	defer m.blocksMutex.RUnlock()
+
+	_, ok := m.blocksByHash[hash]
+	return ok
+}
+
+// Get returns a block given a hash.
+func (m *MemBackedBlockDB) Get(hash common.Hash) (types.Block, error) {
+	m.blocksMutex.RLock()
+	defer m.blocksMutex.RUnlock()
+
+	return m.internalGet(hash)
+}
+
+func (m *MemBackedBlockDB) internalGet(hash common.Hash) (types.Block, error) {
+	b, ok := m.blocksByHash[hash]
+	if !ok {
+		return types.Block{}, ErrBlockDoesNotExist
+	}
+	return *b, nil
+}
+
+// Put inserts a new block into the database.
+func (m *MemBackedBlockDB) Put(block types.Block) error {
+	if m.Has(block.Hash) {
+		return ErrBlockExists
+	}
+
+	m.blocksMutex.Lock()
+	defer m.blocksMutex.Unlock()
+
+	m.blockHashSequence = append(m.blockHashSequence, block.Hash)
+	m.blocksByHash[block.Hash] = &block
+	return nil
+}
+
+// Update updates a block in the database.
+func (m *MemBackedBlockDB) Update(block types.Block) error {
+	m.blocksMutex.Lock()
+	defer m.blocksMutex.Unlock()
+
+	m.blocksByHash[block.Hash] = &block
+	return nil
+}
+
+// Close implement Closer interface, which would release allocated resource.
+func (m *MemBackedBlockDB) Close() (err error) {
+	// Save internal state to a pretty-print json file. It's a temporary way
+	// to dump private file via JSON encoding.
+	if len(m.persistantFilePath) == 0 {
+		return
+	}
+
+	m.blocksMutex.RLock()
+	defer m.blocksMutex.RUnlock()
+
+	toDump := struct {
+		Sequence common.Hashes
+		ByHash   map[common.Hash]*types.Block
+	}{
+		Sequence: m.blockHashSequence,
+		ByHash:   m.blocksByHash,
+	}
+
+	// Dump to JSON with 2-space indent.
+	buf, err := json.Marshal(&toDump)
+	if err != nil {
+		return
+	}
+
+	err = ioutil.WriteFile(m.persistantFilePath, buf, 0644)
+	return
+}
+
+func (m *MemBackedBlockDB) getByIndex(idx int) (types.Block, error) {
+	m.blocksMutex.RLock()
+	defer m.blocksMutex.RUnlock()
+
+	if idx >= len(m.blockHashSequence) {
+		return types.Block{}, ErrIterationFinished
+	}
+
+	hash := m.blockHashSequence[idx]
+	return m.internalGet(hash)
+}
+
+// GetAll implement Reader.GetAll method, which allows caller
+// to retrieve all blocks in DB.
+func (m *MemBackedBlockDB) GetAll() (BlockIterator, error) {
+	return &seqIterator{db: m}, nil
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/blockpool.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/blockpool.go
new file mode 100644
index 000000000..261966719
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/blockpool.go
@@ -0,0 +1,85 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"container/heap"
+
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+// blockPool is a slice of heap of blocks, indexed by chainID,
+// and the heap is sorted based on heights of blocks.
+type blockPool []types.ByPosition
+
+// newBlockPool constructs a blockPool.
+func newBlockPool(chainNum uint32) (pool blockPool) {
+	pool = make(blockPool, chainNum)
+	for _, p := range pool {
+		heap.Init(&p)
+	}
+	return
+}
+
+// resize the pool if new chain is added.
+func (p *blockPool) resize(num uint32) {
+	if uint32(len(*p)) >= num {
+		return
+	}
+	newPool := make([]types.ByPosition, num)
+	copy(newPool, *p)
+	for i := uint32(len(*p)); i < num; i++ {
+		newChain := types.ByPosition{}
+		heap.Init(&newChain)
+		newPool[i] = newChain
+	}
+	*p = newPool
+}
+
+// addBlock adds a block into pending set and make sure these
+// blocks are sorted by height.
+func (p blockPool) addBlock(b *types.Block) {
+	heap.Push(&p[b.Position.ChainID], b)
+}
+
+// purgeBlocks purge blocks of that chain with less-or-equal height.
+// NOTE: we won't check the validity of 'chainID', the caller should
+//       be sure what he is expecting.
+func (p blockPool) purgeBlocks(chainID uint32, height uint64) {
+	for {
+		if len(p[chainID]) == 0 || p[chainID][0].Position.Height > height {
+			break
+		}
+		heap.Pop(&p[chainID])
+	}
+}
+
+// tip get the blocks with lowest height of the chain if any.
+func (p blockPool) tip(chainID uint32) *types.Block {
+	if len(p[chainID]) == 0 {
+		return nil
+	}
+	return p[chainID][0]
+}
+
+// removeTip removes block with lowest height of the specified chain.
+func (p blockPool) removeTip(chainID uint32) {
+	if len(p[chainID]) > 0 {
+		heap.Pop(&p[chainID])
+	}
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/compaction-chain.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/compaction-chain.go
new file mode 100644
index 000000000..65592f1d0
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/compaction-chain.go
@@ -0,0 +1,264 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"container/heap"
+	"fmt"
+	"sync"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+// Errors for compaction chain module.
+var (
+	ErrBlockNotRegistered = fmt.Errorf(
+		"block not registered")
+	ErrNotInitiazlied = fmt.Errorf(
+		"not initialized")
+)
+
+type finalizedBlockHeap = types.ByFinalizationHeight
+
+type compactionChain struct {
+	gov                    Governance
+	chainUnsynced          uint32
+	tsigVerifier           *TSigVerifierCache
+	blocks                 map[common.Hash]*types.Block
+	pendingBlocks          []*types.Block
+	pendingFinalizedBlocks *finalizedBlockHeap
+	lock                   sync.RWMutex
+	prevBlock              *types.Block
+}
+
+func newCompactionChain(gov Governance) *compactionChain {
+	pendingFinalizedBlocks := &finalizedBlockHeap{}
+	heap.Init(pendingFinalizedBlocks)
+	return &compactionChain{
+		gov:                    gov,
+		tsigVerifier:           NewTSigVerifierCache(gov, 7),
+		blocks:                 make(map[common.Hash]*types.Block),
+		pendingFinalizedBlocks: pendingFinalizedBlocks,
+	}
+}
+
+func (cc *compactionChain) init(initBlock *types.Block) {
+	cc.lock.Lock()
+	defer cc.lock.Unlock()
+	cc.prevBlock = initBlock
+	cc.pendingBlocks = []*types.Block{}
+	if initBlock.Finalization.Height == 0 {
+		cc.chainUnsynced = cc.gov.Configuration(uint64(0)).NumChains
+		cc.pendingBlocks = append(cc.pendingBlocks, initBlock)
+	}
+}
+
+func (cc *compactionChain) registerBlock(block *types.Block) {
+	if cc.blockRegistered(block.Hash) {
+		return
+	}
+	cc.lock.Lock()
+	defer cc.lock.Unlock()
+	cc.blocks[block.Hash] = block
+}
+
+func (cc *compactionChain) blockRegistered(hash common.Hash) (exist bool) {
+	cc.lock.RLock()
+	defer cc.lock.RUnlock()
+	_, exist = cc.blocks[hash]
+	return
+}
+
+func (cc *compactionChain) processBlock(block *types.Block) error {
+	prevBlock := cc.lastBlock()
+	if prevBlock == nil {
+		return ErrNotInitiazlied
+	}
+	cc.lock.Lock()
+	defer cc.lock.Unlock()
+	if prevBlock.Finalization.Height == 0 && block.Position.Height == 0 {
+		cc.chainUnsynced--
+	}
+	cc.pendingBlocks = append(cc.pendingBlocks, block)
+	return nil
+}
+
+func (cc *compactionChain) extractBlocks() []*types.Block {
+	prevBlock := cc.lastBlock()
+
+	// Check if we're synced.
+	if !func() bool {
+		cc.lock.RLock()
+		defer cc.lock.RUnlock()
+		if len(cc.pendingBlocks) == 0 {
+			return false
+		}
+		// Finalization.Height == 0 is syncing from bootstrap.
+		if prevBlock.Finalization.Height == 0 {
+			return cc.chainUnsynced == 0
+		}
+		if prevBlock.Hash != cc.pendingBlocks[0].Hash {
+			return false
+		}
+		return true
+	}() {
+		return []*types.Block{}
+	}
+	deliveringBlocks := make([]*types.Block, 0)
+	cc.lock.Lock()
+	defer cc.lock.Unlock()
+	// cc.pendingBlocks[0] will not be popped and will equal to cc.prevBlock.
+	for len(cc.pendingBlocks) > 1 &&
+		(len(cc.pendingBlocks[1].Finalization.Randomness) != 0 ||
+			cc.pendingBlocks[1].Position.Round == 0) {
+		delete(cc.blocks, cc.pendingBlocks[0].Hash)
+		cc.pendingBlocks = cc.pendingBlocks[1:]
+
+		block := cc.pendingBlocks[0]
+		block.Finalization.ParentHash = prevBlock.Hash
+		block.Finalization.Height = prevBlock.Finalization.Height + 1
+		deliveringBlocks = append(deliveringBlocks, block)
+		prevBlock = block
+	}
+
+	cc.prevBlock = prevBlock
+
+	return deliveringBlocks
+}
+
+func (cc *compactionChain) processFinalizedBlock(block *types.Block) {
+	if block.Finalization.Height <= cc.lastBlock().Finalization.Height {
+		return
+	}
+
+	// Block of round 0 should not have randomness.
+	if block.Position.Round == 0 && len(block.Finalization.Randomness) != 0 {
+		return
+	}
+
+	cc.lock.Lock()
+	defer cc.lock.Unlock()
+	heap.Push(cc.pendingFinalizedBlocks, block)
+
+	return
+}
+
+func (cc *compactionChain) extractFinalizedBlocks() []*types.Block {
+	prevBlock := cc.lastBlock()
+
+	blocks := func() []*types.Block {
+		cc.lock.Lock()
+		defer cc.lock.Unlock()
+		blocks := []*types.Block{}
+		prevHeight := prevBlock.Finalization.Height
+		for cc.pendingFinalizedBlocks.Len() != 0 {
+			tip := (*cc.pendingFinalizedBlocks)[0]
+			// Pop blocks that are already confirmed.
+			if tip.Finalization.Height <= prevBlock.Finalization.Height {
+				heap.Pop(cc.pendingFinalizedBlocks)
+				continue
+			}
+			// Since we haven't verified the finalized block,
+			// it is possible to be forked.
+			if tip.Finalization.Height == prevHeight ||
+				tip.Finalization.Height == prevHeight+1 {
+				prevHeight = tip.Finalization.Height
+				blocks = append(blocks, tip)
+				heap.Pop(cc.pendingFinalizedBlocks)
+			} else {
+				break
+			}
+		}
+		return blocks
+	}()
+	toPending := []*types.Block{}
+	confirmed := []*types.Block{}
+	for _, b := range blocks {
+		if b.Hash == prevBlock.Hash &&
+			b.Finalization.Height == prevBlock.Finalization.Height {
+			continue
+		}
+		round := b.Position.Round
+		if round != 0 {
+			// Randomness is not available at round 0.
+			v, ok, err := cc.tsigVerifier.UpdateAndGet(round)
+			if err != nil {
+				continue
+			}
+			if !ok {
+				toPending = append(toPending, b)
+				continue
+			}
+			if ok := v.VerifySignature(b.Hash, crypto.Signature{
+				Type:      "bls",
+				Signature: b.Finalization.Randomness}); !ok {
+				continue
+			}
+		}
+		// Fork resolution: choose block with smaller hash.
+		if prevBlock.Finalization.Height == b.Finalization.Height {
+			//TODO(jimmy-dexon): remove this panic after test.
+			if true {
+				// workaround to `go vet` error
+				panic(fmt.Errorf(
+					"forked finalized block %s,%s", prevBlock.Hash, b.Hash))
+			}
+			if b.Hash.Less(prevBlock.Hash) {
+				confirmed = confirmed[:len(confirmed)-1]
+			} else {
+				continue
+			}
+		}
+		if b.Finalization.Height-prevBlock.Finalization.Height > 1 {
+			toPending = append(toPending, b)
+			continue
+		}
+		confirmed = append(confirmed, b)
+		prevBlock = b
+	}
+	cc.lock.Lock()
+	defer cc.lock.Unlock()
+	if len(confirmed) != 0 && cc.prevBlock.Finalization.Height == 0 {
+		// Pop the initBlock inserted when bootstrapping.
+		cc.pendingBlocks = cc.pendingBlocks[1:]
+	}
+	cc.prevBlock = prevBlock
+	for _, b := range toPending {
+		heap.Push(cc.pendingFinalizedBlocks, b)
+	}
+	return confirmed
+}
+
+func (cc *compactionChain) processBlockRandomnessResult(
+	rand *types.BlockRandomnessResult) error {
+	if !cc.blockRegistered(rand.BlockHash) {
+		return ErrBlockNotRegistered
+	}
+	cc.lock.Lock()
+	defer cc.lock.Unlock()
+	cc.blocks[rand.BlockHash].Finalization.Randomness = rand.Randomness
+	return nil
+}
+
+func (cc *compactionChain) lastBlock() *types.Block {
+	cc.lock.RLock()
+	defer cc.lock.RUnlock()
+	return cc.prevBlock
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/configuration-chain.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/configuration-chain.go
new file mode 100644
index 000000000..5e5a587cb
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/configuration-chain.go
@@ -0,0 +1,312 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
+)
+
+// Errors for configuration chain..
+var (
+	ErrDKGNotRegistered = fmt.Errorf(
+		"not yet registered in DKG protocol")
+	ErrTSigAlreadyRunning = fmt.Errorf(
+		"tsig is already running")
+	ErrDKGNotReady = fmt.Errorf(
+		"DKG is not ready")
+)
+
+type configurationChain struct {
+	ID          types.NodeID
+	recv        dkgReceiver
+	gov         Governance
+	dkg         *dkgProtocol
+	logger      common.Logger
+	dkgLock     sync.RWMutex
+	dkgSigner   map[uint64]*dkgShareSecret
+	gpk         map[uint64]*DKGGroupPublicKey
+	dkgResult   sync.RWMutex
+	tsig        map[common.Hash]*tsigProtocol
+	tsigTouched map[common.Hash]struct{}
+	tsigReady   *sync.Cond
+	// TODO(jimmy-dexon): add timeout to pending psig.
+	pendingPsig map[common.Hash][]*typesDKG.PartialSignature
+	prevHash    common.Hash
+}
+
+func newConfigurationChain(
+	ID types.NodeID,
+	recv dkgReceiver,
+	gov Governance,
+	logger common.Logger) *configurationChain {
+	return &configurationChain{
+		ID:          ID,
+		recv:        recv,
+		gov:         gov,
+		logger:      logger,
+		dkgSigner:   make(map[uint64]*dkgShareSecret),
+		gpk:         make(map[uint64]*DKGGroupPublicKey),
+		tsig:        make(map[common.Hash]*tsigProtocol),
+		tsigTouched: make(map[common.Hash]struct{}),
+		tsigReady:   sync.NewCond(&sync.Mutex{}),
+		pendingPsig: make(map[common.Hash][]*typesDKG.PartialSignature),
+	}
+}
+
+func (cc *configurationChain) registerDKG(round uint64, threshold int) {
+	cc.dkgLock.Lock()
+	defer cc.dkgLock.Unlock()
+	cc.dkg = newDKGProtocol(
+		cc.ID,
+		cc.recv,
+		round,
+		threshold)
+}
+
+func (cc *configurationChain) runDKG(round uint64) error {
+	cc.dkgLock.Lock()
+	defer cc.dkgLock.Unlock()
+	if cc.dkg == nil || cc.dkg.round != round {
+		return ErrDKGNotRegistered
+	}
+	if func() bool {
+		cc.dkgResult.RLock()
+		defer cc.dkgResult.RUnlock()
+		_, exist := cc.gpk[round]
+		return exist
+	}() {
+		return nil
+	}
+
+	ticker := newTicker(cc.gov, round, TickerDKG)
+	cc.dkgLock.Unlock()
+	<-ticker.Tick()
+	cc.dkgLock.Lock()
+	// Phase 2(T = 0): Exchange DKG secret key share.
+	cc.logger.Debug("Calling Governance.DKGMasterPublicKeys", "round", round)
+	cc.dkg.processMasterPublicKeys(cc.gov.DKGMasterPublicKeys(round))
+	// Phase 3(T = 0~λ): Propose complaint.
+	// Propose complaint is done in `processMasterPublicKeys`.
+	cc.dkgLock.Unlock()
+	<-ticker.Tick()
+	cc.dkgLock.Lock()
+	// Phase 4(T = λ): Propose nack complaints.
+	cc.dkg.proposeNackComplaints()
+	cc.dkgLock.Unlock()
+	<-ticker.Tick()
+	cc.dkgLock.Lock()
+	// Phase 5(T = 2λ): Propose Anti nack complaint.
+	cc.logger.Debug("Calling Governance.DKGComplaints", "round", round)
+	cc.dkg.processNackComplaints(cc.gov.DKGComplaints(round))
+	cc.dkgLock.Unlock()
+	<-ticker.Tick()
+	cc.dkgLock.Lock()
+	// Phase 6(T = 3λ): Rebroadcast anti nack complaint.
+	// Rebroadcast is done in `processPrivateShare`.
+	cc.dkgLock.Unlock()
+	<-ticker.Tick()
+	cc.dkgLock.Lock()
+	// Phase 7(T = 4λ): Enforce complaints and nack complaints.
+	cc.logger.Debug("Calling Governance.DKGComplaints", "round", round)
+	cc.dkg.enforceNackComplaints(cc.gov.DKGComplaints(round))
+	// Enforce complaint is done in `processPrivateShare`.
+	// Phase 8(T = 5λ): DKG finalize.
+	cc.dkgLock.Unlock()
+	<-ticker.Tick()
+	cc.dkgLock.Lock()
+	cc.dkg.proposeFinalize()
+	// Phase 9(T = 6λ): DKG is ready.
+	cc.dkgLock.Unlock()
+	<-ticker.Tick()
+	cc.dkgLock.Lock()
+	// Normally, IsDKGFinal would return true here. Use this for in case of
+	// unexpected network fluctuation and ensure the robustness of DKG protocol.
+	cc.logger.Debug("Calling Governance.IsDKGFinal", "round", round)
+	for !cc.gov.IsDKGFinal(round) {
+		cc.logger.Info("DKG is not ready yet. Try again later...",
+			"nodeID", cc.ID)
+		time.Sleep(500 * time.Millisecond)
+	}
+	cc.logger.Debug("Calling Governance.DKGMasterPublicKeys", "round", round)
+	cc.logger.Debug("Calling Governance.DKGComplaints", "round", round)
+	gpk, err := NewDKGGroupPublicKey(round,
+		cc.gov.DKGMasterPublicKeys(round),
+		cc.gov.DKGComplaints(round),
+		cc.dkg.threshold)
+	if err != nil {
+		return err
+	}
+	signer, err := cc.dkg.recoverShareSecret(gpk.qualifyIDs)
+	if err != nil {
+		return err
+	}
+	qualifies := ""
+	for nID := range gpk.qualifyNodeIDs {
+		qualifies += fmt.Sprintf("%s ", nID.String()[:6])
+	}
+	cc.logger.Info("Qualify Nodes",
+		"nodeID", cc.ID,
+		"round", round,
+		"count", len(gpk.qualifyIDs),
+		"qualifies", qualifies)
+	cc.dkgResult.Lock()
+	defer cc.dkgResult.Unlock()
+	cc.dkgSigner[round] = signer
+	cc.gpk[round] = gpk
+	return nil
+}
+
+func (cc *configurationChain) preparePartialSignature(
+	round uint64, hash common.Hash) (*typesDKG.PartialSignature, error) {
+	signer, exist := func() (*dkgShareSecret, bool) {
+		cc.dkgResult.RLock()
+		defer cc.dkgResult.RUnlock()
+		signer, exist := cc.dkgSigner[round]
+		return signer, exist
+	}()
+	if !exist {
+		return nil, ErrDKGNotReady
+	}
+	return &typesDKG.PartialSignature{
+		ProposerID:       cc.ID,
+		Round:            round,
+		Hash:             hash,
+		PartialSignature: signer.sign(hash),
+	}, nil
+}
+
+func (cc *configurationChain) touchTSigHash(hash common.Hash) (first bool) {
+	cc.tsigReady.L.Lock()
+	defer cc.tsigReady.L.Unlock()
+	_, exist := cc.tsigTouched[hash]
+	cc.tsigTouched[hash] = struct{}{}
+	return !exist
+}
+
+func (cc *configurationChain) untouchTSigHash(hash common.Hash) {
+	cc.tsigReady.L.Lock()
+	defer cc.tsigReady.L.Unlock()
+	delete(cc.tsigTouched, hash)
+}
+
+func (cc *configurationChain) runTSig(
+	round uint64, hash common.Hash) (
+	crypto.Signature, error) {
+	gpk, exist := func() (*DKGGroupPublicKey, bool) {
+		cc.dkgResult.RLock()
+		defer cc.dkgResult.RUnlock()
+		gpk, exist := cc.gpk[round]
+		return gpk, exist
+	}()
+	if !exist {
+		return crypto.Signature{}, ErrDKGNotReady
+	}
+	cc.tsigReady.L.Lock()
+	defer cc.tsigReady.L.Unlock()
+	if _, exist := cc.tsig[hash]; exist {
+		return crypto.Signature{}, ErrTSigAlreadyRunning
+	}
+	cc.tsig[hash] = newTSigProtocol(gpk, hash)
+	pendingPsig := cc.pendingPsig[hash]
+	delete(cc.pendingPsig, hash)
+	go func() {
+		for _, psig := range pendingPsig {
+			if err := cc.processPartialSignature(psig); err != nil {
+				cc.logger.Error("failed to process partial signature",
+					"nodeID", cc.ID,
+					"error", err)
+			}
+		}
+	}()
+	var signature crypto.Signature
+	var err error
+	for func() bool {
+		signature, err = cc.tsig[hash].signature()
+		return err == ErrNotEnoughtPartialSignatures
+	}() {
+		// TODO(jimmy-dexon): add a timeout here.
+		cc.tsigReady.Wait()
+	}
+	delete(cc.tsig, hash)
+	if err != nil {
+		return crypto.Signature{}, err
+	}
+	return signature, nil
+}
+
+func (cc *configurationChain) runBlockTSig(
+	round uint64, hash common.Hash) (crypto.Signature, error) {
+	sig, err := cc.runTSig(round, hash)
+	if err != nil {
+		return crypto.Signature{}, err
+	}
+	cc.logger.Info("Block TSIG",
+		"nodeID", cc.ID,
+		"round", round,
+		"signature", sig)
+	return sig, nil
+}
+
+func (cc *configurationChain) runCRSTSig(
+	round uint64, crs common.Hash) ([]byte, error) {
+	sig, err := cc.runTSig(round, crs)
+	cc.logger.Info("CRS",
+		"nodeID", cc.ID,
+		"round", round+1,
+		"signature", sig)
+	return sig.Signature[:], err
+}
+
+func (cc *configurationChain) processPrivateShare(
+	prvShare *typesDKG.PrivateShare) error {
+	cc.dkgLock.Lock()
+	defer cc.dkgLock.Unlock()
+	if cc.dkg == nil {
+		return nil
+	}
+	return cc.dkg.processPrivateShare(prvShare)
+}
+
+func (cc *configurationChain) processPartialSignature(
+	psig *typesDKG.PartialSignature) error {
+	cc.tsigReady.L.Lock()
+	defer cc.tsigReady.L.Unlock()
+	if _, exist := cc.tsig[psig.Hash]; !exist {
+		ok, err := verifyDKGPartialSignatureSignature(psig)
+		if err != nil {
+			return err
+		}
+		if !ok {
+			return ErrIncorrectPartialSignatureSignature
+		}
+		cc.pendingPsig[psig.Hash] = append(cc.pendingPsig[psig.Hash], psig)
+		return nil
+	}
+	if err := cc.tsig[psig.Hash].processPartialSignature(psig); err != nil {
+		return err
+	}
+	cc.tsigReady.Broadcast()
+	return nil
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus-timestamp.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus-timestamp.go
new file mode 100644
index 000000000..9750a74c3
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus-timestamp.go
@@ -0,0 +1,139 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"errors"
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+// consensusTimestamp is for Concensus Timestamp Algorithm.
+type consensusTimestamp struct {
+	chainTimestamps []time.Time
+
+	// This part keeps configs for each round.
+	numChainsOfRounds []uint32
+	numChainsBase     uint64
+
+	// dMoment represents the genesis time.
+	dMoment time.Time
+	// lastTimestamp represents previous assigned consensus timestamp.
+	lastTimestamp time.Time
+}
+
+var (
+	// ErrTimestampNotIncrease would be reported if the timestamp is not strickly
+	// increasing on the same chain.
+	ErrTimestampNotIncrease = errors.New("timestamp is not increasing")
+	// ErrNoRoundConfig for no round config found.
+	ErrNoRoundConfig = errors.New("no round config found")
+	// ErrConsensusTimestampRewind would be reported if the generated timestamp
+	// is rewinded.
+	ErrConsensusTimestampRewind = errors.New("consensus timestamp rewind")
+)
+
+// newConsensusTimestamp creates timestamper object.
+func newConsensusTimestamp(
+	dMoment time.Time, round uint64, numChains uint32) *consensusTimestamp {
+	ts := make([]time.Time, 0, numChains)
+	for i := uint32(0); i < numChains; i++ {
+		ts = append(ts, dMoment)
+	}
+	return &consensusTimestamp{
+		numChainsOfRounds: []uint32{numChains},
+		numChainsBase:     round,
+		dMoment:           dMoment,
+		chainTimestamps:   ts,
+	}
+}
+
+// appendConfig appends a configuration for upcoming round. When you append
+// a config for round R, next time you can only append the config for round R+1.
+func (ct *consensusTimestamp) appendConfig(
+	round uint64, config *types.Config) error {
+
+	if round != uint64(len(ct.numChainsOfRounds))+ct.numChainsBase {
+		return ErrRoundNotIncreasing
+	}
+	ct.numChainsOfRounds = append(ct.numChainsOfRounds, config.NumChains)
+	return nil
+}
+
+func (ct *consensusTimestamp) resizeChainTimetamps(numChain uint32) {
+	l := uint32(len(ct.chainTimestamps))
+	if numChain > l {
+		for i := l; i < numChain; i++ {
+			ct.chainTimestamps = append(ct.chainTimestamps, ct.dMoment)
+		}
+	} else if numChain < l {
+		ct.chainTimestamps = ct.chainTimestamps[:numChain]
+	}
+}
+
+// ProcessBlocks is the entry function.
+func (ct *consensusTimestamp) processBlocks(blocks []*types.Block) (err error) {
+	for _, block := range blocks {
+		// Rounds might interleave within rounds if no configuration change
+		// occurs. And it is limited to one round, that is, round r can only
+		// interleave with r-1 and r+1.
+		round := block.Position.Round
+		if ct.numChainsBase == round || ct.numChainsBase+1 == round {
+			// Normal case, no need to modify chainTimestamps.
+		} else if ct.numChainsBase+2 == round {
+			if len(ct.numChainsOfRounds) < 2 {
+				return ErrNoRoundConfig
+			}
+			ct.numChainsBase++
+			ct.numChainsOfRounds = ct.numChainsOfRounds[1:]
+			if ct.numChainsOfRounds[0] > ct.numChainsOfRounds[1] {
+				ct.resizeChainTimetamps(ct.numChainsOfRounds[0])
+			} else {
+				ct.resizeChainTimetamps(ct.numChainsOfRounds[1])
+			}
+		} else {
+			// Error if round < base or round > base + 2.
+			return ErrInvalidRoundID
+		}
+		ts := ct.chainTimestamps[:ct.numChainsOfRounds[round-ct.numChainsBase]]
+		if block.Finalization.Timestamp, err = getMedianTime(ts); err != nil {
+			return
+		}
+		if block.Timestamp.Before(ct.chainTimestamps[block.Position.ChainID]) {
+			return ErrTimestampNotIncrease
+		}
+		ct.chainTimestamps[block.Position.ChainID] = block.Timestamp
+		if block.Finalization.Timestamp.Before(ct.lastTimestamp) {
+			block.Finalization.Timestamp = ct.lastTimestamp
+		} else {
+			ct.lastTimestamp = block.Finalization.Timestamp
+		}
+	}
+	return
+}
+
+func (ct *consensusTimestamp) isSynced() bool {
+	numChain := ct.numChainsOfRounds[0]
+	for i := uint32(0); i < numChain; i++ {
+		if ct.chainTimestamps[i].Equal(ct.dMoment) {
+			return false
+		}
+	}
+	return true
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus.go
new file mode 100644
index 000000000..7e6934f45
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus.go
@@ -0,0 +1,1026 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"context"
+	"encoding/hex"
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/blockdb"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
+)
+
+// Errors for consensus core.
+var (
+	ErrProposerNotInNodeSet = fmt.Errorf(
+		"proposer is not in node set")
+	ErrIncorrectHash = fmt.Errorf(
+		"hash of block is incorrect")
+	ErrIncorrectSignature = fmt.Errorf(
+		"signature of block is incorrect")
+	ErrGenesisBlockNotEmpty = fmt.Errorf(
+		"genesis block should be empty")
+	ErrUnknownBlockProposed = fmt.Errorf(
+		"unknown block is proposed")
+	ErrIncorrectAgreementResultPosition = fmt.Errorf(
+		"incorrect agreement result position")
+	ErrNotEnoughVotes = fmt.Errorf(
+		"not enought votes")
+	ErrIncorrectVoteBlockHash = fmt.Errorf(
+		"incorrect vote block hash")
+	ErrIncorrectVoteType = fmt.Errorf(
+		"incorrect vote type")
+	ErrIncorrectVotePosition = fmt.Errorf(
+		"incorrect vote position")
+	ErrIncorrectVoteProposer = fmt.Errorf(
+		"incorrect vote proposer")
+	ErrIncorrectBlockRandomnessResult = fmt.Errorf(
+		"incorrect block randomness result")
+)
+
+// consensusBAReceiver implements agreementReceiver.
+type consensusBAReceiver struct {
+	// TODO(mission): consensus would be replaced by lattice and network.
+	consensus        *Consensus
+	agreementModule  *agreement
+	chainID          uint32
+	changeNotaryTime time.Time
+	round            uint64
+	restartNotary    chan bool
+}
+
+func (recv *consensusBAReceiver) ProposeVote(vote *types.Vote) {
+	go func() {
+		if err := recv.agreementModule.prepareVote(vote); err != nil {
+			recv.consensus.logger.Error("Failed to prepare vote", "error", err)
+			return
+		}
+		if err := recv.agreementModule.processVote(vote); err != nil {
+			recv.consensus.logger.Error("Failed to process vote", "error", err)
+			return
+		}
+		recv.consensus.logger.Debug("Calling Network.BroadcastVote",
+			"vote", vote)
+		recv.consensus.network.BroadcastVote(vote)
+	}()
+}
+
+func (recv *consensusBAReceiver) ProposeBlock() common.Hash {
+	block := recv.consensus.proposeBlock(recv.chainID, recv.round)
+	if block == nil {
+		recv.consensus.logger.Error("unable to propose block")
+		return nullBlockHash
+	}
+	if err := recv.consensus.preProcessBlock(block); err != nil {
+		recv.consensus.logger.Error("Failed to pre-process block", "error", err)
+		return common.Hash{}
+	}
+	recv.consensus.logger.Debug("Calling Network.BroadcastBlock", "block", block)
+	recv.consensus.network.BroadcastBlock(block)
+	return block.Hash
+}
+
+func (recv *consensusBAReceiver) ConfirmBlock(
+	hash common.Hash, votes map[types.NodeID]*types.Vote) {
+	var block *types.Block
+	if (hash == common.Hash{}) {
+		recv.consensus.logger.Info("Empty block is confirmed",
+			"position", recv.agreementModule.agreementID())
+		var err error
+		block, err = recv.consensus.proposeEmptyBlock(recv.chainID)
+		if err != nil {
+			recv.consensus.logger.Error("Propose empty block failed", "error", err)
+			return
+		}
+	} else {
+		var exist bool
+		block, exist = recv.consensus.baModules[recv.chainID].
+			findCandidateBlockNoLock(hash)
+		if !exist {
+			recv.consensus.logger.Error("Unknown block confirmed",
+				"hash", hash,
+				"chainID", recv.chainID)
+			ch := make(chan *types.Block)
+			func() {
+				recv.consensus.lock.Lock()
+				defer recv.consensus.lock.Unlock()
+				recv.consensus.baConfirmedBlock[hash] = ch
+			}()
+			recv.consensus.network.PullBlocks(common.Hashes{hash})
+			go func() {
+				block = <-ch
+				recv.consensus.logger.Info("Receive unknown block",
+					"hash", hash,
+					"chainID", recv.chainID)
+				recv.agreementModule.addCandidateBlock(block)
+				recv.ConfirmBlock(block.Hash, votes)
+			}()
+			return
+		}
+	}
+	recv.consensus.ccModule.registerBlock(block)
+	voteList := make([]types.Vote, 0, len(votes))
+	for _, vote := range votes {
+		if vote.BlockHash != hash {
+			continue
+		}
+		voteList = append(voteList, *vote)
+	}
+	result := &types.AgreementResult{
+		BlockHash: block.Hash,
+		Position:  block.Position,
+		Votes:     voteList,
+	}
+	recv.consensus.logger.Debug("Calling Network.BroadcastAgreementResult",
+		"result", result)
+	recv.consensus.network.BroadcastAgreementResult(result)
+	if err := recv.consensus.processBlock(block); err != nil {
+		recv.consensus.logger.Error("Failed to process block", "error", err)
+		return
+	}
+	if block.Timestamp.After(recv.changeNotaryTime) {
+		recv.round++
+		recv.restartNotary <- true
+	} else {
+		recv.restartNotary <- false
+	}
+}
+
+func (recv *consensusBAReceiver) PullBlocks(hashes common.Hashes) {
+	recv.consensus.logger.Debug("Calling Network.PullBlocks", "hashes", hashes)
+	recv.consensus.network.PullBlocks(hashes)
+}
+
+// consensusDKGReceiver implements dkgReceiver.
+type consensusDKGReceiver struct {
+	ID           types.NodeID
+	gov          Governance
+	authModule   *Authenticator
+	nodeSetCache *NodeSetCache
+	cfgModule    *configurationChain
+	network      Network
+	logger       common.Logger
+}
+
+// ProposeDKGComplaint proposes a DKGComplaint.
+func (recv *consensusDKGReceiver) ProposeDKGComplaint(
+	complaint *typesDKG.Complaint) {
+	if err := recv.authModule.SignDKGComplaint(complaint); err != nil {
+		recv.logger.Error("Failed to sign DKG complaint", "error", err)
+		return
+	}
+	recv.logger.Debug("Calling Governace.AddDKGComplaint",
+		"complaint", complaint)
+	recv.gov.AddDKGComplaint(complaint.Round, complaint)
+}
+
+// ProposeDKGMasterPublicKey propose a DKGMasterPublicKey.
+func (recv *consensusDKGReceiver) ProposeDKGMasterPublicKey(
+	mpk *typesDKG.MasterPublicKey) {
+	if err := recv.authModule.SignDKGMasterPublicKey(mpk); err != nil {
+		recv.logger.Error("Failed to sign DKG master public key", "error", err)
+		return
+	}
+	recv.logger.Debug("Calling Governance.AddDKGMasterPublicKey", "key", mpk)
+	recv.gov.AddDKGMasterPublicKey(mpk.Round, mpk)
+}
+
+// ProposeDKGPrivateShare propose a DKGPrivateShare.
+func (recv *consensusDKGReceiver) ProposeDKGPrivateShare(
+	prv *typesDKG.PrivateShare) {
+	if err := recv.authModule.SignDKGPrivateShare(prv); err != nil {
+		recv.logger.Error("Failed to sign DKG private share", "error", err)
+		return
+	}
+	receiverPubKey, exists := recv.nodeSetCache.GetPublicKey(prv.ReceiverID)
+	if !exists {
+		recv.logger.Error("Public key for receiver not found",
+			"receiver", prv.ReceiverID.String()[:6])
+		return
+	}
+	if prv.ReceiverID == recv.ID {
+		go func() {
+			if err := recv.cfgModule.processPrivateShare(prv); err != nil {
+				recv.logger.Error("Failed to process self private share", "prvShare", prv)
+			}
+		}()
+	} else {
+		recv.logger.Debug("Calling Network.SendDKGPrivateShare",
+			"receiver", hex.EncodeToString(receiverPubKey.Bytes()))
+		recv.network.SendDKGPrivateShare(receiverPubKey, prv)
+	}
+}
+
+// ProposeDKGAntiNackComplaint propose a DKGPrivateShare as an anti complaint.
+func (recv *consensusDKGReceiver) ProposeDKGAntiNackComplaint(
+	prv *typesDKG.PrivateShare) {
+	if prv.ProposerID == recv.ID {
+		if err := recv.authModule.SignDKGPrivateShare(prv); err != nil {
+			recv.logger.Error("Failed sign DKG private share", "error", err)
+			return
+		}
+	}
+	recv.logger.Debug("Calling Network.BroadcastDKGPrivateShare", "share", prv)
+	recv.network.BroadcastDKGPrivateShare(prv)
+}
+
+// ProposeDKGFinalize propose a DKGFinalize message.
+func (recv *consensusDKGReceiver) ProposeDKGFinalize(final *typesDKG.Finalize) {
+	if err := recv.authModule.SignDKGFinalize(final); err != nil {
+		recv.logger.Error("Faield to sign DKG finalize", "error", err)
+		return
+	}
+	recv.logger.Debug("Calling Governance.AddDKGFinalize", "final", final)
+	recv.gov.AddDKGFinalize(final.Round, final)
+}
+
+// Consensus implements DEXON Consensus algorithm.
+type Consensus struct {
+	// Node Info.
+	ID            types.NodeID
+	authModule    *Authenticator
+	currentConfig *types.Config
+
+	// BA.
+	baModules        []*agreement
+	receivers        []*consensusBAReceiver
+	baConfirmedBlock map[common.Hash]chan<- *types.Block
+
+	// DKG.
+	dkgRunning int32
+	dkgReady   *sync.Cond
+	cfgModule  *configurationChain
+
+	// Dexon consensus v1's modules.
+	lattice  *Lattice
+	ccModule *compactionChain
+
+	// Interfaces.
+	db        blockdb.BlockDatabase
+	app       Application
+	gov       Governance
+	network   Network
+	tickerObj Ticker
+
+	// Misc.
+	dMoment       time.Time
+	nodeSetCache  *NodeSetCache
+	round         uint64
+	roundToNotify uint64
+	lock          sync.RWMutex
+	ctx           context.Context
+	ctxCancel     context.CancelFunc
+	event         *common.Event
+	logger        common.Logger
+}
+
+// NewConsensus construct an Consensus instance.
+func NewConsensus(
+	dMoment time.Time,
+	app Application,
+	gov Governance,
+	db blockdb.BlockDatabase,
+	network Network,
+	prv crypto.PrivateKey,
+	logger common.Logger) *Consensus {
+
+	// TODO(w): load latest blockHeight from DB, and use config at that height.
+	var (
+		round uint64
+		// round 0 and 1 are decided at beginning.
+		roundToNotify = round + 2
+	)
+	logger.Debug("Calling Governance.Configuration", "round", round)
+	config := gov.Configuration(round)
+	nodeSetCache := NewNodeSetCache(gov)
+	logger.Debug("Calling Governance.CRS", "round", round)
+	crs := gov.CRS(round)
+	// Setup acking by information returned from Governace.
+	nodes, err := nodeSetCache.GetNodeSet(round)
+	if err != nil {
+		panic(err)
+	}
+	// Setup auth module.
+	authModule := NewAuthenticator(prv)
+	// Check if the application implement Debug interface.
+	debugApp, _ := app.(Debug)
+	// Init lattice.
+	lattice := NewLattice(
+		dMoment, config, authModule, app, debugApp, db, logger)
+	// Init configuration chain.
+	ID := types.NewNodeID(prv.PublicKey())
+	recv := &consensusDKGReceiver{
+		ID:           ID,
+		gov:          gov,
+		authModule:   authModule,
+		nodeSetCache: nodeSetCache,
+		network:      network,
+		logger:       logger,
+	}
+	cfgModule := newConfigurationChain(
+		ID,
+		recv,
+		gov,
+		logger)
+	recv.cfgModule = cfgModule
+	// Construct Consensus instance.
+	con := &Consensus{
+		ID:               ID,
+		currentConfig:    config,
+		ccModule:         newCompactionChain(gov),
+		lattice:          lattice,
+		app:              app,
+		gov:              gov,
+		db:               db,
+		network:          network,
+		tickerObj:        newTicker(gov, round, TickerBA),
+		baConfirmedBlock: make(map[common.Hash]chan<- *types.Block),
+		dkgReady:         sync.NewCond(&sync.Mutex{}),
+		cfgModule:        cfgModule,
+		dMoment:          dMoment,
+		nodeSetCache:     nodeSetCache,
+		authModule:       authModule,
+		event:            common.NewEvent(),
+		logger:           logger,
+		roundToNotify:    roundToNotify,
+	}
+
+	validLeader := func(block *types.Block) bool {
+		return lattice.SanityCheck(block) == nil
+	}
+
+	con.baModules = make([]*agreement, config.NumChains)
+	con.receivers = make([]*consensusBAReceiver, config.NumChains)
+	for i := uint32(0); i < config.NumChains; i++ {
+		chainID := i
+		recv := &consensusBAReceiver{
+			consensus:     con,
+			chainID:       chainID,
+			restartNotary: make(chan bool, 1),
+		}
+		agreementModule := newAgreement(
+			con.ID,
+			recv,
+			nodes.IDs,
+			newLeaderSelector(crs, validLeader),
+			con.authModule,
+		)
+		// Hacky way to make agreement module self contained.
+		recv.agreementModule = agreementModule
+		recv.changeNotaryTime = dMoment
+		con.baModules[chainID] = agreementModule
+		con.receivers[chainID] = recv
+	}
+	return con
+}
+
+// Run starts running DEXON Consensus.
+func (con *Consensus) Run(initBlock *types.Block) {
+	// Setup context.
+	con.ctx, con.ctxCancel = context.WithCancel(context.Background())
+	con.ccModule.init(initBlock)
+	// TODO(jimmy-dexon): change AppendConfig to add config for specific round.
+	for i := uint64(0); i < initBlock.Position.Round; i++ {
+		con.logger.Debug("Calling Governance.Configuration", "round", i+1)
+		cfg := con.gov.Configuration(i + 1)
+		if err := con.lattice.AppendConfig(i+1, cfg); err != nil {
+			panic(err)
+		}
+	}
+	con.logger.Debug("Calling Network.ReceiveChan")
+	go con.processMsg(con.network.ReceiveChan())
+	// Sleep until dMoment come.
+	time.Sleep(con.dMoment.Sub(time.Now().UTC()))
+	con.cfgModule.registerDKG(con.round, int(con.currentConfig.DKGSetSize)/3+1)
+	con.event.RegisterTime(con.dMoment.Add(con.currentConfig.RoundInterval/4),
+		func(time.Time) {
+			con.runDKGTSIG(con.round)
+		})
+	round1 := uint64(1)
+	con.logger.Debug("Calling Governance.Configuration", "round", round1)
+	con.lattice.AppendConfig(round1, con.gov.Configuration(round1))
+	con.initialRound(con.dMoment)
+	ticks := make([]chan struct{}, 0, con.currentConfig.NumChains)
+	for i := uint32(0); i < con.currentConfig.NumChains; i++ {
+		tick := make(chan struct{})
+		ticks = append(ticks, tick)
+		go con.runBA(i, tick)
+	}
+
+	// Reset ticker.
+	<-con.tickerObj.Tick()
+	<-con.tickerObj.Tick()
+	for {
+		<-con.tickerObj.Tick()
+		for _, tick := range ticks {
+			go func(tick chan struct{}) { tick <- struct{}{} }(tick)
+		}
+	}
+}
+
+func (con *Consensus) runBA(chainID uint32, tick <-chan struct{}) {
+	// TODO(jimmy-dexon): move this function inside agreement.
+	agreement := con.baModules[chainID]
+	recv := con.receivers[chainID]
+	recv.restartNotary <- true
+	nIDs := make(map[types.NodeID]struct{})
+	// Reset ticker
+	<-tick
+BALoop:
+	for {
+		select {
+		case <-con.ctx.Done():
+			break BALoop
+		default:
+		}
+		select {
+		case newNotary := <-recv.restartNotary:
+			if newNotary {
+				recv.changeNotaryTime =
+					recv.changeNotaryTime.Add(con.currentConfig.RoundInterval)
+				nodes, err := con.nodeSetCache.GetNodeSet(recv.round)
+				if err != nil {
+					panic(err)
+				}
+				con.logger.Debug("Calling Governance.Configuration",
+					"round", recv.round)
+				con.logger.Debug("Calling Governance.CRS", "round", recv.round)
+				nIDs = nodes.GetSubSet(
+					int(con.gov.Configuration(recv.round).NotarySetSize),
+					types.NewNotarySetTarget(con.gov.CRS(recv.round), chainID))
+			}
+			nextPos := con.lattice.NextPosition(chainID)
+			nextPos.Round = recv.round
+			agreement.restart(nIDs, nextPos)
+		default:
+		}
+		if agreement.pullVotes() {
+			pos := agreement.agreementID()
+			con.logger.Debug("Calling Network.PullVotes for syncing votes",
+				"position", pos)
+			con.network.PullVotes(pos)
+		}
+		err := agreement.nextState()
+		if err != nil {
+			con.logger.Error("Failed to proceed to next state",
+				"nodeID", con.ID.String(),
+				"error", err)
+			break BALoop
+		}
+		for i := 0; i < agreement.clocks(); i++ {
+			// Priority select for agreement.done().
+			select {
+			case <-agreement.done():
+				continue BALoop
+			default:
+			}
+			select {
+			case <-agreement.done():
+				continue BALoop
+			case <-tick:
+			}
+		}
+	}
+}
+
+// runDKGTSIG starts running DKG+TSIG protocol.
+func (con *Consensus) runDKGTSIG(round uint64) {
+	con.dkgReady.L.Lock()
+	defer con.dkgReady.L.Unlock()
+	if con.dkgRunning != 0 {
+		return
+	}
+	con.dkgRunning = 1
+	go func() {
+		startTime := time.Now().UTC()
+		defer func() {
+			con.dkgReady.L.Lock()
+			defer con.dkgReady.L.Unlock()
+			con.dkgReady.Broadcast()
+			con.dkgRunning = 2
+			DKGTime := time.Now().Sub(startTime)
+			if DKGTime.Nanoseconds() >=
+				con.currentConfig.RoundInterval.Nanoseconds()/2 {
+				con.logger.Warn("Your computer cannot finish DKG on time!",
+					"nodeID", con.ID.String())
+			}
+		}()
+		if err := con.cfgModule.runDKG(round); err != nil {
+			panic(err)
+		}
+		nodes, err := con.nodeSetCache.GetNodeSet(round)
+		if err != nil {
+			panic(err)
+		}
+		con.logger.Debug("Calling Governance.Configuration", "round", round)
+		hash := HashConfigurationBlock(
+			nodes.IDs,
+			con.gov.Configuration(round),
+			common.Hash{},
+			con.cfgModule.prevHash)
+		psig, err := con.cfgModule.preparePartialSignature(
+			round, hash)
+		if err != nil {
+			panic(err)
+		}
+		if err = con.authModule.SignDKGPartialSignature(psig); err != nil {
+			panic(err)
+		}
+		if err = con.cfgModule.processPartialSignature(psig); err != nil {
+			panic(err)
+		}
+		con.logger.Debug("Calling Network.BroadcastDKGPartialSignature",
+			"proposer", psig.ProposerID,
+			"round", psig.Round,
+			"hash", psig.Hash)
+		con.network.BroadcastDKGPartialSignature(psig)
+		if _, err = con.cfgModule.runBlockTSig(round, hash); err != nil {
+			panic(err)
+		}
+	}()
+}
+
+func (con *Consensus) runCRS() {
+	// Start running next round CRS.
+	con.logger.Debug("Calling Governance.CRS", "round", con.round)
+	psig, err := con.cfgModule.preparePartialSignature(
+		con.round, con.gov.CRS(con.round))
+	if err != nil {
+		con.logger.Error("Failed to prepare partial signature", "error", err)
+	} else if err = con.authModule.SignDKGPartialSignature(psig); err != nil {
+		con.logger.Error("Failed to sign DKG partial signature", "error", err)
+	} else if err = con.cfgModule.processPartialSignature(psig); err != nil {
+		con.logger.Error("Failed to process partial signature", "error", err)
+	} else {
+		con.logger.Debug("Calling Network.BroadcastDKGPartialSignature",
+			"proposer", psig.ProposerID,
+			"round", psig.Round,
+			"hash", psig.Hash)
+		con.network.BroadcastDKGPartialSignature(psig)
+		con.logger.Debug("Calling Governance.CRS", "round", con.round)
+		crs, err := con.cfgModule.runCRSTSig(con.round, con.gov.CRS(con.round))
+		if err != nil {
+			con.logger.Error("Failed to run CRS Tsig", "error", err)
+		} else {
+			con.logger.Debug("Calling Governance.ProposeCRS",
+				"round", con.round+1,
+				"crs", hex.EncodeToString(crs))
+			con.gov.ProposeCRS(con.round+1, crs)
+		}
+	}
+}
+
+func (con *Consensus) initialRound(startTime time.Time) {
+	select {
+	case <-con.ctx.Done():
+		return
+	default:
+	}
+	con.logger.Debug("Calling Governance.Configuration", "round", con.round)
+	con.currentConfig = con.gov.Configuration(con.round)
+
+	con.event.RegisterTime(startTime.Add(con.currentConfig.RoundInterval/2),
+		func(time.Time) {
+			go func() {
+				con.runCRS()
+				ticker := newTicker(con.gov, con.round, TickerDKG)
+				<-ticker.Tick()
+				// Normally, gov.CRS would return non-nil. Use this for in case of
+				// unexpected network fluctuation and ensure the robustness.
+				for (con.gov.CRS(con.round+1) == common.Hash{}) {
+					con.logger.Info("CRS is not ready yet. Try again later...",
+						"nodeID", con.ID)
+					time.Sleep(500 * time.Millisecond)
+				}
+				con.cfgModule.registerDKG(
+					con.round+1, int(con.currentConfig.DKGSetSize/3)+1)
+			}()
+		})
+	con.event.RegisterTime(startTime.Add(con.currentConfig.RoundInterval*2/3),
+		func(time.Time) {
+			func() {
+				con.dkgReady.L.Lock()
+				defer con.dkgReady.L.Unlock()
+				con.dkgRunning = 0
+			}()
+			con.runDKGTSIG(con.round + 1)
+		})
+	con.event.RegisterTime(startTime.Add(con.currentConfig.RoundInterval),
+		func(time.Time) {
+			// Change round.
+			con.round++
+			con.logger.Debug("Calling Governance.Configuration",
+				"round", con.round+1)
+			con.lattice.AppendConfig(con.round+1, con.gov.Configuration(con.round+1))
+			con.initialRound(startTime.Add(con.currentConfig.RoundInterval))
+		})
+}
+
+// Stop the Consensus core.
+func (con *Consensus) Stop() {
+	for _, a := range con.baModules {
+		a.stop()
+	}
+	con.event.Reset()
+	con.ctxCancel()
+}
+
+func (con *Consensus) processMsg(msgChan <-chan interface{}) {
+MessageLoop:
+	for {
+		var msg interface{}
+		select {
+		case msg = <-msgChan:
+		case <-con.ctx.Done():
+			return
+		}
+
+		switch val := msg.(type) {
+		case *types.Block:
+			if ch, exist := func() (chan<- *types.Block, bool) {
+				con.lock.RLock()
+				defer con.lock.RUnlock()
+				ch, e := con.baConfirmedBlock[val.Hash]
+				return ch, e
+			}(); exist {
+				if err := con.lattice.SanityCheck(val); err != nil {
+					if err == ErrRetrySanityCheckLater {
+						err = nil
+					} else {
+						con.logger.Error("SanityCheck failed", "error", err)
+						continue MessageLoop
+					}
+				}
+				func() {
+					con.lock.Lock()
+					defer con.lock.Unlock()
+					// In case of multiple delivered block.
+					if _, exist := con.baConfirmedBlock[val.Hash]; !exist {
+						return
+					}
+					delete(con.baConfirmedBlock, val.Hash)
+					ch <- val
+				}()
+			} else if val.IsFinalized() {
+				// For sync mode.
+				if err := con.processFinalizedBlock(val); err != nil {
+					con.logger.Error("Failed to process finalized block",
+						"error", err)
+				}
+			} else {
+				if err := con.preProcessBlock(val); err != nil {
+					con.logger.Error("Failed to pre process block",
+						"error", err)
+				}
+			}
+		case *types.Vote:
+			if err := con.ProcessVote(val); err != nil {
+				con.logger.Error("Failed to process vote",
+					"error", err)
+			}
+		case *types.AgreementResult:
+			if err := con.ProcessAgreementResult(val); err != nil {
+				con.logger.Error("Failed to process agreement result",
+					"error", err)
+			}
+		case *types.BlockRandomnessResult:
+			if err := con.ProcessBlockRandomnessResult(val); err != nil {
+				con.logger.Error("Failed to process block randomness result",
+					"error", err)
+			}
+		case *typesDKG.PrivateShare:
+			if err := con.cfgModule.processPrivateShare(val); err != nil {
+				con.logger.Error("Failed to process private share",
+					"error", err)
+			}
+
+		case *typesDKG.PartialSignature:
+			if err := con.cfgModule.processPartialSignature(val); err != nil {
+				con.logger.Error("Failed to process partial signature",
+					"error", err)
+			}
+		}
+	}
+}
+
+func (con *Consensus) proposeBlock(chainID uint32, round uint64) *types.Block {
+	block := &types.Block{
+		Position: types.Position{
+			ChainID: chainID,
+			Round:   round,
+		},
+	}
+	if err := con.prepareBlock(block, time.Now().UTC()); err != nil {
+		con.logger.Error("Failed to prepare block", "error", err)
+		return nil
+	}
+	return block
+}
+
+func (con *Consensus) proposeEmptyBlock(
+	chainID uint32) (*types.Block, error) {
+	block := &types.Block{
+		Position: types.Position{
+			ChainID: chainID,
+		},
+	}
+	if err := con.lattice.PrepareEmptyBlock(block); err != nil {
+		return nil, err
+	}
+	return block, nil
+}
+
+// ProcessVote is the entry point to submit ont vote to a Consensus instance.
+func (con *Consensus) ProcessVote(vote *types.Vote) (err error) {
+	v := vote.Clone()
+	err = con.baModules[v.Position.ChainID].processVote(v)
+	return err
+}
+
+// ProcessAgreementResult processes the randomness request.
+func (con *Consensus) ProcessAgreementResult(
+	rand *types.AgreementResult) error {
+	// Sanity Check.
+	notarySet, err := con.nodeSetCache.GetNotarySet(
+		rand.Position.Round, rand.Position.ChainID)
+	if err != nil {
+		return err
+	}
+	if len(rand.Votes) < len(notarySet)/3*2+1 {
+		return ErrNotEnoughVotes
+	}
+	if len(rand.Votes) > len(notarySet) {
+		return ErrIncorrectVoteProposer
+	}
+	for _, vote := range rand.Votes {
+		if vote.BlockHash != rand.BlockHash {
+			return ErrIncorrectVoteBlockHash
+		}
+		if vote.Type != types.VoteCom {
+			return ErrIncorrectVoteType
+		}
+		if vote.Position != rand.Position {
+			return ErrIncorrectVotePosition
+		}
+		if _, exist := notarySet[vote.ProposerID]; !exist {
+			return ErrIncorrectVoteProposer
+		}
+		ok, err := verifyVoteSignature(&vote)
+		if err != nil {
+			return err
+		}
+		if !ok {
+			return ErrIncorrectVoteSignature
+		}
+	}
+	// Syncing BA Module.
+	agreement := con.baModules[rand.Position.ChainID]
+	aID := agreement.agreementID()
+	if rand.Position.Newer(&aID) {
+		con.logger.Info("Syncing BA", "position", rand.Position)
+		nodes, err := con.nodeSetCache.GetNodeSet(rand.Position.Round)
+		if err != nil {
+			return err
+		}
+		con.logger.Debug("Calling Network.PullBlocks for syncing BA",
+			"hash", rand.BlockHash)
+		con.network.PullBlocks(common.Hashes{rand.BlockHash})
+		nIDs := nodes.GetSubSet(
+			int(con.gov.Configuration(rand.Position.Round).NotarySetSize),
+			types.NewNotarySetTarget(
+				con.gov.CRS(rand.Position.Round), rand.Position.ChainID))
+		for _, vote := range rand.Votes {
+			agreement.processVote(&vote)
+		}
+		agreement.restart(nIDs, rand.Position)
+	}
+	// Calculating randomness.
+	if rand.Position.Round == 0 {
+		return nil
+	}
+	if !con.ccModule.blockRegistered(rand.BlockHash) {
+		return nil
+	}
+	if DiffUint64(con.round, rand.Position.Round) > 1 {
+		return nil
+	}
+	// Sanity check done.
+	if !con.cfgModule.touchTSigHash(rand.BlockHash) {
+		return nil
+	}
+	con.logger.Debug("Calling Network.BroadcastAgreementResult", "result", rand)
+	con.network.BroadcastAgreementResult(rand)
+	dkgSet, err := con.nodeSetCache.GetDKGSet(rand.Position.Round)
+	if err != nil {
+		return err
+	}
+	if _, exist := dkgSet[con.ID]; !exist {
+		return nil
+	}
+	psig, err := con.cfgModule.preparePartialSignature(rand.Position.Round, rand.BlockHash)
+	if err != nil {
+		return err
+	}
+	if err = con.authModule.SignDKGPartialSignature(psig); err != nil {
+		return err
+	}
+	if err = con.cfgModule.processPartialSignature(psig); err != nil {
+		return err
+	}
+	con.logger.Debug("Calling Network.BroadcastDKGPartialSignature",
+		"proposer", psig.ProposerID,
+		"round", psig.Round,
+		"hash", psig.Hash)
+	con.network.BroadcastDKGPartialSignature(psig)
+	go func() {
+		tsig, err := con.cfgModule.runTSig(rand.Position.Round, rand.BlockHash)
+		if err != nil {
+			if err != ErrTSigAlreadyRunning {
+				con.logger.Error("Faield to run TSIG", "error", err)
+			}
+			return
+		}
+		result := &types.BlockRandomnessResult{
+			BlockHash:  rand.BlockHash,
+			Position:   rand.Position,
+			Randomness: tsig.Signature,
+		}
+		if err := con.ProcessBlockRandomnessResult(result); err != nil {
+			con.logger.Error("Failed to process randomness result",
+				"error", err)
+			return
+		}
+	}()
+	return nil
+}
+
+// ProcessBlockRandomnessResult processes the randomness result.
+func (con *Consensus) ProcessBlockRandomnessResult(
+	rand *types.BlockRandomnessResult) error {
+	if rand.Position.Round == 0 {
+		return nil
+	}
+	if !con.ccModule.blockRegistered(rand.BlockHash) {
+		return nil
+	}
+	round := rand.Position.Round
+	v, ok, err := con.ccModule.tsigVerifier.UpdateAndGet(round)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return nil
+	}
+	if !v.VerifySignature(
+		rand.BlockHash, crypto.Signature{Signature: rand.Randomness}) {
+		return ErrIncorrectBlockRandomnessResult
+	}
+	con.logger.Debug("Calling Network.BroadcastRandomnessResult",
+		"hash", rand.BlockHash,
+		"position", rand.Position,
+		"randomness", hex.EncodeToString(rand.Randomness))
+	con.network.BroadcastRandomnessResult(rand)
+	if err := con.ccModule.processBlockRandomnessResult(rand); err != nil {
+		if err != ErrBlockNotRegistered {
+			return err
+		}
+	}
+	return nil
+}
+
+// preProcessBlock performs Byzantine Agreement on the block.
+func (con *Consensus) preProcessBlock(b *types.Block) (err error) {
+	if err = con.lattice.SanityCheck(b); err != nil {
+		if err != ErrRetrySanityCheckLater {
+			return
+		}
+	}
+	if err = con.baModules[b.Position.ChainID].processBlock(b); err != nil {
+		return err
+	}
+	return
+}
+
+// deliverBlock deliver a block to application layer.
+func (con *Consensus) deliverBlock(b *types.Block) {
+	// TODO(mission): clone types.FinalizationResult
+	con.logger.Debug("Calling Application.BlockDelivered", "block", b)
+	con.app.BlockDelivered(b.Hash, b.Finalization)
+	if b.Position.Round+2 == con.roundToNotify {
+		// Only the first block delivered of that round would
+		// trigger this noitification.
+		con.gov.NotifyRoundHeight(
+			con.roundToNotify, b.Finalization.Height)
+		con.roundToNotify++
+	}
+}
+
+// processBlock is the entry point to submit one block to a Consensus instance.
+func (con *Consensus) processBlock(block *types.Block) (err error) {
+	if err = con.db.Put(*block); err != nil && err != blockdb.ErrBlockExists {
+		return
+	}
+	con.lock.Lock()
+	defer con.lock.Unlock()
+	// Block processed by lattice can be out-of-order. But the output of lattice
+	// (deliveredBlocks) cannot.
+	deliveredBlocks, err := con.lattice.ProcessBlock(block)
+	if err != nil {
+		return
+	}
+	// Pass delivered blocks to compaction chain.
+	for _, b := range deliveredBlocks {
+		if err = con.ccModule.processBlock(b); err != nil {
+			return
+		}
+		go con.event.NotifyTime(b.Finalization.Timestamp)
+	}
+	deliveredBlocks = con.ccModule.extractBlocks()
+	for _, b := range deliveredBlocks {
+		if err = con.db.Update(*b); err != nil {
+			panic(err)
+		}
+		con.cfgModule.untouchTSigHash(b.Hash)
+		con.deliverBlock(b)
+	}
+	if err = con.lattice.PurgeBlocks(deliveredBlocks); err != nil {
+		return
+	}
+	return
+}
+
+// processFinalizedBlock is the entry point for syncing blocks.
+func (con *Consensus) processFinalizedBlock(block *types.Block) (err error) {
+	if err = con.lattice.SanityCheck(block); err != nil {
+		return
+	}
+	con.ccModule.processFinalizedBlock(block)
+	for {
+		confirmed := con.ccModule.extractFinalizedBlocks()
+		if len(confirmed) == 0 {
+			break
+		}
+		if err = con.lattice.ctModule.processBlocks(confirmed); err != nil {
+			return
+		}
+		for _, b := range confirmed {
+			if err = con.db.Put(*b); err != nil {
+				if err != blockdb.ErrBlockExists {
+					return
+				}
+				err = nil
+			}
+			con.deliverBlock(b)
+		}
+	}
+	return
+}
+
+// PrepareBlock would setup header fields of block based on its ProposerID.
+func (con *Consensus) prepareBlock(b *types.Block,
+	proposeTime time.Time) (err error) {
+	if err = con.lattice.PrepareBlock(b, proposeTime); err != nil {
+		return
+	}
+	// TODO(mission): decide CRS by block's round, which could be determined by
+	//                block's info (ex. position, timestamp).
+	con.logger.Debug("Calling Governance.CRS", "round", 0)
+	if err = con.authModule.SignCRS(b, con.gov.CRS(0)); err != nil {
+		return
+	}
+	return
+}
+
+// PrepareGenesisBlock would setup header fields for genesis block.
+func (con *Consensus) PrepareGenesisBlock(b *types.Block,
+	proposeTime time.Time) (err error) {
+	if err = con.prepareBlock(b, proposeTime); err != nil {
+		return
+	}
+	if len(b.Payload) != 0 {
+		err = ErrGenesisBlockNotEmpty
+		return
+	}
+	return
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto.go
new file mode 100644
index 000000000..2b7f7a7fc
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto.go
@@ -0,0 +1,264 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"encoding/binary"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
+)
+
+func hashWitness(witness *types.Witness) (common.Hash, error) {
+	binaryHeight := make([]byte, 8)
+	binary.LittleEndian.PutUint64(binaryHeight, witness.Height)
+	return crypto.Keccak256Hash(
+		binaryHeight,
+		witness.Data), nil
+}
+
+func hashBlock(block *types.Block) (common.Hash, error) {
+	hashPosition := hashPosition(block.Position)
+	// Handling Block.Acks.
+	binaryAcks := make([][]byte, len(block.Acks))
+	for idx, ack := range block.Acks {
+		binaryAcks[idx] = ack[:]
+	}
+	hashAcks := crypto.Keccak256Hash(binaryAcks...)
+	binaryTimestamp, err := block.Timestamp.UTC().MarshalBinary()
+	if err != nil {
+		return common.Hash{}, err
+	}
+	binaryWitness, err := hashWitness(&block.Witness)
+	if err != nil {
+		return common.Hash{}, err
+	}
+
+	hash := crypto.Keccak256Hash(
+		block.ProposerID.Hash[:],
+		block.ParentHash[:],
+		hashPosition[:],
+		hashAcks[:],
+		binaryTimestamp[:],
+		block.PayloadHash[:],
+		binaryWitness[:])
+	return hash, nil
+}
+
+func verifyBlockSignature(pubkey crypto.PublicKey,
+	block *types.Block, sig crypto.Signature) (bool, error) {
+	hash, err := hashBlock(block)
+	if err != nil {
+		return false, err
+	}
+	return pubkey.VerifySignature(hash, sig), nil
+}
+
+func hashVote(vote *types.Vote) common.Hash {
+	binaryPeriod := make([]byte, 8)
+	binary.LittleEndian.PutUint64(binaryPeriod, vote.Period)
+
+	hashPosition := hashPosition(vote.Position)
+
+	hash := crypto.Keccak256Hash(
+		vote.ProposerID.Hash[:],
+		vote.BlockHash[:],
+		binaryPeriod,
+		hashPosition[:],
+		[]byte{byte(vote.Type)},
+	)
+	return hash
+}
+
+func verifyVoteSignature(vote *types.Vote) (bool, error) {
+	hash := hashVote(vote)
+	pubKey, err := crypto.SigToPub(hash, vote.Signature)
+	if err != nil {
+		return false, err
+	}
+	if vote.ProposerID != types.NewNodeID(pubKey) {
+		return false, nil
+	}
+	return true, nil
+}
+
+func hashCRS(block *types.Block, crs common.Hash) common.Hash {
+	hashPos := hashPosition(block.Position)
+	return crypto.Keccak256Hash(crs[:], hashPos[:])
+}
+
+func verifyCRSSignature(block *types.Block, crs common.Hash) (
+	bool, error) {
+	hash := hashCRS(block, crs)
+	pubKey, err := crypto.SigToPub(hash, block.CRSSignature)
+	if err != nil {
+		return false, err
+	}
+	if block.ProposerID != types.NewNodeID(pubKey) {
+		return false, nil
+	}
+	return true, nil
+}
+
+func hashPosition(position types.Position) common.Hash {
+	binaryChainID := make([]byte, 4)
+	binary.LittleEndian.PutUint32(binaryChainID, position.ChainID)
+
+	binaryHeight := make([]byte, 8)
+	binary.LittleEndian.PutUint64(binaryHeight, position.Height)
+
+	return crypto.Keccak256Hash(
+		binaryChainID,
+		binaryHeight,
+	)
+}
+
+func hashDKGPrivateShare(prvShare *typesDKG.PrivateShare) common.Hash {
+	binaryRound := make([]byte, 8)
+	binary.LittleEndian.PutUint64(binaryRound, prvShare.Round)
+
+	return crypto.Keccak256Hash(
+		prvShare.ProposerID.Hash[:],
+		prvShare.ReceiverID.Hash[:],
+		binaryRound,
+		prvShare.PrivateShare.Bytes(),
+	)
+}
+
+func verifyDKGPrivateShareSignature(
+	prvShare *typesDKG.PrivateShare) (bool, error) {
+	hash := hashDKGPrivateShare(prvShare)
+	pubKey, err := crypto.SigToPub(hash, prvShare.Signature)
+	if err != nil {
+		return false, err
+	}
+	if prvShare.ProposerID != types.NewNodeID(pubKey) {
+		return false, nil
+	}
+	return true, nil
+}
+
+func hashDKGMasterPublicKey(mpk *typesDKG.MasterPublicKey) common.Hash {
+	binaryRound := make([]byte, 8)
+	binary.LittleEndian.PutUint64(binaryRound, mpk.Round)
+
+	return crypto.Keccak256Hash(
+		mpk.ProposerID.Hash[:],
+		mpk.DKGID.GetLittleEndian(),
+		mpk.PublicKeyShares.MasterKeyBytes(),
+		binaryRound,
+	)
+}
+
+// VerifyDKGMasterPublicKeySignature verifies DKGMasterPublicKey signature.
+func VerifyDKGMasterPublicKeySignature(
+	mpk *typesDKG.MasterPublicKey) (bool, error) {
+	hash := hashDKGMasterPublicKey(mpk)
+	pubKey, err := crypto.SigToPub(hash, mpk.Signature)
+	if err != nil {
+		return false, err
+	}
+	if mpk.ProposerID != types.NewNodeID(pubKey) {
+		return false, nil
+	}
+	return true, nil
+}
+
+func hashDKGComplaint(complaint *typesDKG.Complaint) common.Hash {
+	binaryRound := make([]byte, 8)
+	binary.LittleEndian.PutUint64(binaryRound, complaint.Round)
+
+	hashPrvShare := hashDKGPrivateShare(&complaint.PrivateShare)
+
+	return crypto.Keccak256Hash(
+		complaint.ProposerID.Hash[:],
+		binaryRound,
+		hashPrvShare[:],
+	)
+}
+
+// VerifyDKGComplaintSignature verifies DKGCompliant signature.
+func VerifyDKGComplaintSignature(
+	complaint *typesDKG.Complaint) (bool, error) {
+	if complaint.Round != complaint.PrivateShare.Round {
+		return false, nil
+	}
+	hash := hashDKGComplaint(complaint)
+	pubKey, err := crypto.SigToPub(hash, complaint.Signature)
+	if err != nil {
+		return false, err
+	}
+	if complaint.ProposerID != types.NewNodeID(pubKey) {
+		return false, nil
+	}
+	if !complaint.IsNack() {
+		return verifyDKGPrivateShareSignature(&complaint.PrivateShare)
+	}
+	return true, nil
+}
+
+func hashDKGPartialSignature(psig *typesDKG.PartialSignature) common.Hash {
+	binaryRound := make([]byte, 8)
+	binary.LittleEndian.PutUint64(binaryRound, psig.Round)
+
+	return crypto.Keccak256Hash(
+		psig.ProposerID.Hash[:],
+		binaryRound,
+		psig.Hash[:],
+		psig.PartialSignature.Signature[:],
+	)
+}
+
+func verifyDKGPartialSignatureSignature(
+	psig *typesDKG.PartialSignature) (bool, error) {
+	hash := hashDKGPartialSignature(psig)
+	pubKey, err := crypto.SigToPub(hash, psig.Signature)
+	if err != nil {
+		return false, err
+	}
+	if psig.ProposerID != types.NewNodeID(pubKey) {
+		return false, nil
+	}
+	return true, nil
+}
+
+func hashDKGFinalize(final *typesDKG.Finalize) common.Hash {
+	binaryRound := make([]byte, 8)
+	binary.LittleEndian.PutUint64(binaryRound, final.Round)
+
+	return crypto.Keccak256Hash(
+		final.ProposerID.Hash[:],
+		binaryRound,
+	)
+}
+
+// VerifyDKGFinalizeSignature verifies DKGFinalize signature.
+func VerifyDKGFinalizeSignature(
+	final *typesDKG.Finalize) (bool, error) {
+	hash := hashDKGFinalize(final)
+	pubKey, err := crypto.SigToPub(hash, final.Signature)
+	if err != nil {
+		return false, err
+	}
+	if final.ProposerID != types.NewNodeID(pubKey) {
+		return false, nil
+	}
+	return true, nil
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/constant.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/constant.go
new file mode 100644
index 000000000..3e7ef4574
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/constant.go
@@ -0,0 +1,26 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package dkg
+
+import (
+	"github.com/dexon-foundation/bls/ffi/go/bls"
+)
+
+const (
+	curve = bls.CurveFp382_2
+)
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/dkg.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/dkg.go
new file mode 100644
index 000000000..5be16847d
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/dkg.go
@@ -0,0 +1,560 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package dkg
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+
+	"github.com/dexon-foundation/bls/ffi/go/bls"
+	"github.com/dexon-foundation/dexon/rlp"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+)
+
+var (
+	// ErrDuplicatedShare is reported when adding an private key share of same id.
+	ErrDuplicatedShare = fmt.Errorf("invalid share")
+	// ErrNoIDToRecover is reported when no id is provided for recovering private
+	// key.
+	ErrNoIDToRecover = fmt.Errorf("no id to recover private key")
+	// ErrShareNotFound is reported when the private key share of id is not found
+	// when recovering private key.
+	ErrShareNotFound = fmt.Errorf("share not found")
+)
+
+const cryptoType = "bls"
+
+var publicKeyLength int
+
+func init() {
+	bls.Init(curve)
+
+	pubKey := &bls.PublicKey{}
+	publicKeyLength = len(pubKey.Serialize())
+}
+
+// PrivateKey represents a private key structure implments
+// Crypto.PrivateKey interface.
+type PrivateKey struct {
+	privateKey bls.SecretKey
+	publicKey  PublicKey
+}
+
+// EncodeRLP implements rlp.Encoder
+func (prv *PrivateKey) EncodeRLP(w io.Writer) error {
+	return rlp.Encode(w, prv.Bytes())
+}
+
+// DecodeRLP implements rlp.Decoder
+func (prv *PrivateKey) DecodeRLP(s *rlp.Stream) error {
+	var b []byte
+	if err := s.Decode(&b); err != nil {
+		return err
+	}
+	return prv.SetBytes(b)
+}
+
+// MarshalJSON implements json.Marshaller.
+func (prv *PrivateKey) MarshalJSON() ([]byte, error) {
+	return json.Marshal(&prv.privateKey)
+}
+
+// UnmarshalJSON implements json.Unmarshaller.
+func (prv *PrivateKey) UnmarshalJSON(data []byte) error {
+	return json.Unmarshal(data, &prv.privateKey)
+}
+
+// ID is the id for DKG protocol.
+type ID = bls.ID
+
+// IDs is an array of ID.
+type IDs []ID
+
+// PublicKey represents a public key structure implements
+// Crypto.PublicKey interface.
+type PublicKey struct {
+	publicKey bls.PublicKey
+}
+
+// PrivateKeyShares represents a private key shares for DKG protocol.
+type PrivateKeyShares struct {
+	shares           []PrivateKey
+	shareIndex       map[ID]int
+	masterPrivateKey []bls.SecretKey
+}
+
+// Equal check equality between two PrivateKeyShares instances.
+func (prvs *PrivateKeyShares) Equal(other *PrivateKeyShares) bool {
+	// Check shares.
+	if len(prvs.shareIndex) != len(other.shareIndex) {
+		return false
+	}
+	for dID, idx := range prvs.shareIndex {
+		otherIdx, exists := other.shareIndex[dID]
+		if !exists {
+			return false
+		}
+		if !prvs.shares[idx].privateKey.IsEqual(
+			&other.shares[otherIdx].privateKey) {
+			return false
+		}
+	}
+	// Check master private keys.
+	if len(prvs.masterPrivateKey) != len(other.masterPrivateKey) {
+		return false
+	}
+	for idx, m := range prvs.masterPrivateKey {
+		if m.GetHexString() != other.masterPrivateKey[idx].GetHexString() {
+			return false
+		}
+	}
+	return true
+}
+
+// PublicKeyShares represents a public key shares for DKG protocol.
+type PublicKeyShares struct {
+	shareCaches     []PublicKey
+	shareCacheIndex map[ID]int
+	masterPublicKey []bls.PublicKey
+}
+
+type rlpPublicKeyShares struct {
+	ShareCaches      [][]byte
+	ShareCacheIndexK [][]byte
+	ShareCacheIndexV []uint32
+	MasterPublicKey  [][]byte
+}
+
+// Equal checks equality of two PublicKeyShares instance.
+func (pubs *PublicKeyShares) Equal(other *PublicKeyShares) bool {
+	// Check shares.
+	for dID, idx := range pubs.shareCacheIndex {
+		otherIdx, exists := other.shareCacheIndex[dID]
+		if !exists {
+			continue
+		}
+		if !pubs.shareCaches[idx].publicKey.IsEqual(
+			&other.shareCaches[otherIdx].publicKey) {
+			return false
+		}
+	}
+	// Check master public keys.
+	if len(pubs.masterPublicKey) != len(other.masterPublicKey) {
+		return false
+	}
+	for idx, m := range pubs.masterPublicKey {
+		if m.GetHexString() != other.masterPublicKey[idx].GetHexString() {
+			return false
+		}
+	}
+	return true
+}
+
+// EncodeRLP implements rlp.Encoder
+func (pubs *PublicKeyShares) EncodeRLP(w io.Writer) error {
+	var rps rlpPublicKeyShares
+	for _, share := range pubs.shareCaches {
+		rps.ShareCaches = append(rps.ShareCaches, share.Serialize())
+	}
+
+	for id, v := range pubs.shareCacheIndex {
+		rps.ShareCacheIndexK = append(
+			rps.ShareCacheIndexK, id.GetLittleEndian())
+		rps.ShareCacheIndexV = append(rps.ShareCacheIndexV, uint32(v))
+	}
+
+	for _, m := range pubs.masterPublicKey {
+		rps.MasterPublicKey = append(rps.MasterPublicKey, m.Serialize())
+	}
+
+	return rlp.Encode(w, rps)
+}
+
+// DecodeRLP implements rlp.Decoder
+func (pubs *PublicKeyShares) DecodeRLP(s *rlp.Stream) error {
+	var dec rlpPublicKeyShares
+	if err := s.Decode(&dec); err != nil {
+		return err
+	}
+
+	if len(dec.ShareCacheIndexK) != len(dec.ShareCacheIndexV) {
+		return fmt.Errorf("invalid shareIndex")
+	}
+
+	ps := NewEmptyPublicKeyShares()
+	for _, share := range dec.ShareCaches {
+		var publicKey PublicKey
+		if err := publicKey.Deserialize(share); err != nil {
+			return err
+		}
+		ps.shareCaches = append(ps.shareCaches, publicKey)
+	}
+
+	for i, k := range dec.ShareCacheIndexK {
+		id, err := BytesID(k)
+		if err != nil {
+			return err
+		}
+		ps.shareCacheIndex[id] = int(dec.ShareCacheIndexV[i])
+	}
+
+	for _, k := range dec.MasterPublicKey {
+		var key bls.PublicKey
+		if err := key.Deserialize(k); err != nil {
+			return err
+		}
+		ps.masterPublicKey = append(ps.masterPublicKey, key)
+	}
+
+	*pubs = *ps
+	return nil
+}
+
+// MarshalJSON implements json.Marshaller.
+func (pubs *PublicKeyShares) MarshalJSON() ([]byte, error) {
+	type Alias PublicKeyShares
+	data := &struct {
+		MasterPublicKeys []*bls.PublicKey `json:"master_public_keys"`
+	}{
+		make([]*bls.PublicKey, len(pubs.masterPublicKey)),
+	}
+	for i := range pubs.masterPublicKey {
+		data.MasterPublicKeys[i] = &pubs.masterPublicKey[i]
+	}
+	return json.Marshal(data)
+}
+
+// UnmarshalJSON implements json.Unmarshaller.
+func (pubs *PublicKeyShares) UnmarshalJSON(data []byte) error {
+	type Alias PublicKeyShares
+	aux := &struct {
+		MasterPublicKeys []*bls.PublicKey `json:"master_public_keys"`
+	}{}
+	if err := json.Unmarshal(data, &aux); err != nil {
+		return err
+	}
+	mpk := make([]bls.PublicKey, len(aux.MasterPublicKeys))
+	for i, pk := range aux.MasterPublicKeys {
+		mpk[i] = *pk
+	}
+	pubs.masterPublicKey = mpk
+	return nil
+}
+
+// Clone clones every fields of PublicKeyShares. This method is mainly
+// for testing purpose thus would panic when error.
+func (pubs *PublicKeyShares) Clone() *PublicKeyShares {
+	b, err := rlp.EncodeToBytes(pubs)
+	if err != nil {
+		panic(err)
+	}
+	pubsCopy := NewEmptyPublicKeyShares()
+	if err := rlp.DecodeBytes(b, pubsCopy); err != nil {
+		panic(err)
+	}
+	return pubsCopy
+}
+
+// NewID creates a ew ID structure.
+func NewID(id []byte) ID {
+	var blsID bls.ID
+	blsID.SetLittleEndian(id)
+	return blsID
+}
+
+// BytesID creates a new ID structure,
+// It returns err if the byte slice is not valid.
+func BytesID(id []byte) (ID, error) {
+	var blsID bls.ID
+	err := blsID.SetLittleEndian(id)
+	return blsID, err
+}
+
+// NewPrivateKey creates a new PrivateKey structure.
+func NewPrivateKey() *PrivateKey {
+	var key bls.SecretKey
+	key.SetByCSPRNG()
+	return &PrivateKey{
+		privateKey: key,
+		publicKey:  *newPublicKey(&key),
+	}
+}
+
+// NewPrivateKeyShares creates a DKG private key shares of threshold t.
+func NewPrivateKeyShares(t int) (*PrivateKeyShares, *PublicKeyShares) {
+	var prv bls.SecretKey
+	prv.SetByCSPRNG()
+	msk := prv.GetMasterSecretKey(t)
+	mpk := bls.GetMasterPublicKey(msk)
+	return &PrivateKeyShares{
+			masterPrivateKey: msk,
+			shareIndex:       make(map[ID]int),
+		}, &PublicKeyShares{
+			shareCacheIndex: make(map[ID]int),
+			masterPublicKey: mpk,
+		}
+}
+
+// NewEmptyPrivateKeyShares creates an empty private key shares.
+func NewEmptyPrivateKeyShares() *PrivateKeyShares {
+	return &PrivateKeyShares{
+		shareIndex: make(map[ID]int),
+	}
+}
+
+// SetParticipants sets the DKG participants.
+func (prvs *PrivateKeyShares) SetParticipants(IDs IDs) {
+	prvs.shares = make([]PrivateKey, len(IDs))
+	prvs.shareIndex = make(map[ID]int, len(IDs))
+	for idx, ID := range IDs {
+		prvs.shares[idx].privateKey.Set(prvs.masterPrivateKey, &ID)
+		prvs.shareIndex[ID] = idx
+	}
+}
+
+// AddShare adds a share.
+func (prvs *PrivateKeyShares) AddShare(ID ID, share *PrivateKey) error {
+	if idx, exist := prvs.shareIndex[ID]; exist {
+		if !share.privateKey.IsEqual(&prvs.shares[idx].privateKey) {
+			return ErrDuplicatedShare
+		}
+		return nil
+	}
+	prvs.shareIndex[ID] = len(prvs.shares)
+	prvs.shares = append(prvs.shares, *share)
+	return nil
+}
+
+// RecoverPrivateKey recovers private key from the shares.
+func (prvs *PrivateKeyShares) RecoverPrivateKey(qualifyIDs IDs) (
+	*PrivateKey, error) {
+	var prv PrivateKey
+	if len(qualifyIDs) == 0 {
+		return nil, ErrNoIDToRecover
+	}
+	for i, ID := range qualifyIDs {
+		idx, exist := prvs.shareIndex[ID]
+		if !exist {
+			return nil, ErrShareNotFound
+		}
+		if i == 0 {
+			prv.privateKey = prvs.shares[idx].privateKey
+			continue
+		}
+		prv.privateKey.Add(&prvs.shares[idx].privateKey)
+	}
+	return &prv, nil
+}
+
+// RecoverPublicKey recovers public key from the shares.
+func (prvs *PrivateKeyShares) RecoverPublicKey(qualifyIDs IDs) (
+	*PublicKey, error) {
+	var pub PublicKey
+	if len(qualifyIDs) == 0 {
+		return nil, ErrNoIDToRecover
+	}
+	for i, ID := range qualifyIDs {
+		idx, exist := prvs.shareIndex[ID]
+		if !exist {
+			return nil, ErrShareNotFound
+		}
+		if i == 0 {
+			pub.publicKey = *prvs.shares[idx].privateKey.GetPublicKey()
+			continue
+		}
+		pub.publicKey.Add(prvs.shares[idx].privateKey.GetPublicKey())
+	}
+	return &pub, nil
+}
+
+// Share returns the share for the ID.
+func (prvs *PrivateKeyShares) Share(ID ID) (*PrivateKey, bool) {
+	idx, exist := prvs.shareIndex[ID]
+	if !exist {
+		return nil, false
+	}
+	return &prvs.shares[idx], true
+}
+
+// NewEmptyPublicKeyShares creates an empty public key shares.
+func NewEmptyPublicKeyShares() *PublicKeyShares {
+	return &PublicKeyShares{
+		shareCacheIndex: make(map[ID]int),
+	}
+}
+
+// Share returns the share for the ID.
+func (pubs *PublicKeyShares) Share(ID ID) (*PublicKey, error) {
+	idx, exist := pubs.shareCacheIndex[ID]
+	if exist {
+		return &pubs.shareCaches[idx], nil
+	}
+	var pk PublicKey
+	if err := pk.publicKey.Set(pubs.masterPublicKey, &ID); err != nil {
+		return nil, err
+	}
+	pubs.AddShare(ID, &pk)
+	return &pk, nil
+}
+
+// AddShare adds a share.
+func (pubs *PublicKeyShares) AddShare(ID ID, share *PublicKey) error {
+	if idx, exist := pubs.shareCacheIndex[ID]; exist {
+		if !share.publicKey.IsEqual(&pubs.shareCaches[idx].publicKey) {
+			return ErrDuplicatedShare
+		}
+		return nil
+	}
+	pubs.shareCacheIndex[ID] = len(pubs.shareCaches)
+	pubs.shareCaches = append(pubs.shareCaches, *share)
+	return nil
+}
+
+// VerifyPrvShare verifies if the private key shares is valid.
+func (pubs *PublicKeyShares) VerifyPrvShare(ID ID, share *PrivateKey) (
+	bool, error) {
+	var pk bls.PublicKey
+	if err := pk.Set(pubs.masterPublicKey, &ID); err != nil {
+		return false, err
+	}
+	return pk.IsEqual(share.privateKey.GetPublicKey()), nil
+}
+
+// VerifyPubShare verifies if the public key shares is valid.
+func (pubs *PublicKeyShares) VerifyPubShare(ID ID, share *PublicKey) (
+	bool, error) {
+	var pk bls.PublicKey
+	if err := pk.Set(pubs.masterPublicKey, &ID); err != nil {
+		return false, err
+	}
+	return pk.IsEqual(&share.publicKey), nil
+}
+
+// RecoverPublicKey recovers private key from the shares.
+func (pubs *PublicKeyShares) RecoverPublicKey(qualifyIDs IDs) (
+	*PublicKey, error) {
+	var pub PublicKey
+	if len(qualifyIDs) == 0 {
+		return nil, ErrNoIDToRecover
+	}
+	for i, ID := range qualifyIDs {
+		pk, err := pubs.Share(ID)
+		if err != nil {
+			return nil, err
+		}
+		if i == 0 {
+			pub.publicKey = pk.publicKey
+			continue
+		}
+		pub.publicKey.Add(&pk.publicKey)
+	}
+	return &pub, nil
+}
+
+// MasterKeyBytes returns []byte representation of master public key.
+func (pubs *PublicKeyShares) MasterKeyBytes() []byte {
+	bytes := make([]byte, 0, len(pubs.masterPublicKey)*publicKeyLength)
+	for _, pk := range pubs.masterPublicKey {
+		bytes = append(bytes, pk.Serialize()...)
+	}
+	return bytes
+}
+
+// newPublicKey creates a new PublicKey structure.
+func newPublicKey(prvKey *bls.SecretKey) *PublicKey {
+	return &PublicKey{
+		publicKey: *prvKey.GetPublicKey(),
+	}
+}
+
+// newPublicKeyFromBytes create a new PublicKey structure
+// from bytes representation of bls.PublicKey
+func newPublicKeyFromBytes(b []byte) (*PublicKey, error) {
+	var pub PublicKey
+	err := pub.publicKey.Deserialize(b)
+	return &pub, err
+}
+
+// PublicKey returns the public key associate this private key.
+func (prv *PrivateKey) PublicKey() crypto.PublicKey {
+	return prv.publicKey
+}
+
+// Sign calculates a signature.
+func (prv *PrivateKey) Sign(hash common.Hash) (crypto.Signature, error) {
+	msg := string(hash[:])
+	sign := prv.privateKey.Sign(msg)
+	return crypto.Signature{
+		Type:      cryptoType,
+		Signature: sign.Serialize(),
+	}, nil
+}
+
+// Bytes returns []byte representation of private key.
+func (prv *PrivateKey) Bytes() []byte {
+	return prv.privateKey.GetLittleEndian()
+}
+
+// SetBytes sets the private key data to []byte.
+func (prv *PrivateKey) SetBytes(bytes []byte) error {
+	var key bls.SecretKey
+	if err := key.SetLittleEndian(bytes); err != nil {
+		return err
+	}
+	prv.privateKey = key
+	prv.publicKey = *newPublicKey(&prv.privateKey)
+	return nil
+}
+
+// String returns string representation of privat key.
+func (prv *PrivateKey) String() string {
+	return prv.privateKey.GetHexString()
+}
+
+// VerifySignature checks that the given public key created signature over hash.
+func (pub PublicKey) VerifySignature(
+	hash common.Hash, signature crypto.Signature) bool {
+	if len(signature.Signature) == 0 {
+		return false
+	}
+	var sig bls.Sign
+	if err := sig.Deserialize(signature.Signature[:]); err != nil {
+		fmt.Println(err)
+		return false
+	}
+	msg := string(hash[:])
+	return sig.Verify(&pub.publicKey, msg)
+}
+
+// Bytes returns []byte representation of public key.
+func (pub PublicKey) Bytes() []byte {
+	return pub.publicKey.Serialize()
+}
+
+// Serialize return bytes representation of public key.
+func (pub *PublicKey) Serialize() []byte {
+	return pub.publicKey.Serialize()
+}
+
+// Deserialize parses bytes representation of public key.
+func (pub *PublicKey) Deserialize(b []byte) error {
+	return pub.publicKey.Deserialize(b)
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/utils.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/utils.go
new file mode 100644
index 000000000..fa4ad9f05
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/utils.go
@@ -0,0 +1,71 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package dkg
+
+import (
+	"fmt"
+
+	"github.com/dexon-foundation/bls/ffi/go/bls"
+
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+)
+
+// PartialSignature is a partial signature in DKG+TSIG protocol.
+type PartialSignature crypto.Signature
+
+var (
+	// ErrEmptySignature is reported if the signature is empty.
+	ErrEmptySignature = fmt.Errorf("invalid empty signature")
+)
+
+// RecoverSignature recovers TSIG signature.
+func RecoverSignature(sigs []PartialSignature, signerIDs IDs) (
+	crypto.Signature, error) {
+	blsSigs := make([]bls.Sign, len(sigs))
+	for i, sig := range sigs {
+		if len(sig.Signature) == 0 {
+			return crypto.Signature{}, ErrEmptySignature
+		}
+		if err := blsSigs[i].Deserialize([]byte(sig.Signature)); err != nil {
+			return crypto.Signature{}, err
+		}
+	}
+	var recoverSig bls.Sign
+	if err := recoverSig.Recover(blsSigs, []bls.ID(signerIDs)); err != nil {
+		return crypto.Signature{}, err
+	}
+	return crypto.Signature{
+		Type:      cryptoType,
+		Signature: recoverSig.Serialize()}, nil
+}
+
+// RecoverGroupPublicKey recovers group public key.
+func RecoverGroupPublicKey(pubShares []*PublicKeyShares) *PublicKey {
+	var pub *PublicKey
+	for _, pubShare := range pubShares {
+		pk0 := pubShare.masterPublicKey[0]
+		if pub == nil {
+			pub = &PublicKey{
+				publicKey: pk0,
+			}
+		} else {
+			pub.publicKey.Add(&pk0)
+		}
+	}
+	return pub
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa/ecdsa.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa/ecdsa.go
new file mode 100644
index 000000000..82e4dca4b
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa/ecdsa.go
@@ -0,0 +1,133 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package ecdsa
+
+import (
+	"crypto/ecdsa"
+
+	dexCrypto "github.com/dexon-foundation/dexon/crypto"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+)
+
+const cryptoType = "ecdsa"
+
+func init() {
+	crypto.RegisterSigToPub(cryptoType, SigToPub)
+}
+
+// PrivateKey represents a private key structure used in geth and implments
+// Crypto.PrivateKey interface.
+type PrivateKey struct {
+	privateKey *ecdsa.PrivateKey
+}
+
+// PublicKey represents a public key structure used in geth and implements
+// Crypto.PublicKey interface.
+type PublicKey struct {
+	publicKey *ecdsa.PublicKey
+}
+
+// NewPrivateKey creates a new PrivateKey structure.
+func NewPrivateKey() (*PrivateKey, error) {
+	key, err := dexCrypto.GenerateKey()
+	if err != nil {
+		return nil, err
+	}
+	return &PrivateKey{privateKey: key}, nil
+}
+
+// NewPrivateKeyFromECDSA creates a new PrivateKey structure from
+// ecdsa.PrivateKey.
+func NewPrivateKeyFromECDSA(key *ecdsa.PrivateKey) *PrivateKey {
+	return &PrivateKey{privateKey: key}
+}
+
+// NewPublicKeyFromECDSA creates a new PublicKey structure from
+// ecdsa.PublicKey.
+func NewPublicKeyFromECDSA(key *ecdsa.PublicKey) *PublicKey {
+	return &PublicKey{publicKey: key}
+}
+
+// NewPublicKeyFromByteSlice constructs an eth.publicKey instance from
+// a byte slice.
+func NewPublicKeyFromByteSlice(b []byte) (crypto.PublicKey, error) {
+	pub, err := dexCrypto.UnmarshalPubkey(b)
+	if err != nil {
+		return &PublicKey{}, err
+	}
+	return &PublicKey{publicKey: pub}, nil
+}
+
+// PublicKey returns the public key associate this private key.
+func (prv *PrivateKey) PublicKey() crypto.PublicKey {
+	return NewPublicKeyFromECDSA(&(prv.privateKey.PublicKey))
+}
+
+// Sign calculates an ECDSA signature.
+//
+// This function is susceptible to chosen plaintext attacks that can leak
+// information about the private key that is used for signing. Callers must
+// be aware that the given hash cannot be chosen by an adversery. Common
+// solution is to hash any input before calculating the signature.
+//
+// The produced signature is in the [R || S || V] format where V is 0 or 1.
+func (prv *PrivateKey) Sign(hash common.Hash) (
+	sig crypto.Signature, err error) {
+	s, err := dexCrypto.Sign(hash[:], prv.privateKey)
+	sig = crypto.Signature{
+		Type:      cryptoType,
+		Signature: s,
+	}
+	return
+}
+
+// VerifySignature checks that the given public key created signature over hash.
+// The public key should be in compressed (33 bytes) or uncompressed (65 bytes)
+// format.
+// The signature should have the 64 byte [R || S] format.
+func (pub *PublicKey) VerifySignature(
+	hash common.Hash, signature crypto.Signature) bool {
+	sig := signature.Signature
+	if len(sig) == 65 {
+		// The last byte is for ecrecover.
+		sig = sig[:64]
+	}
+	return dexCrypto.VerifySignature(pub.Bytes(), hash[:], sig)
+}
+
+// Compress encodes a public key to the 33-byte compressed format.
+func (pub *PublicKey) Compress() []byte {
+	return dexCrypto.CompressPubkey(pub.publicKey)
+}
+
+// Bytes returns the []byte representation of uncompressed public key. (65 bytes)
+func (pub *PublicKey) Bytes() []byte {
+	return dexCrypto.FromECDSAPub(pub.publicKey)
+}
+
+// SigToPub returns the PublicKey that created the given signature.
+func SigToPub(
+	hash common.Hash, signature crypto.Signature) (crypto.PublicKey, error) {
+	key, err := dexCrypto.SigToPub(hash[:], signature.Signature[:])
+	if err != nil {
+		return &PublicKey{}, err
+	}
+	return &PublicKey{publicKey: key}, nil
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/interfaces.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/interfaces.go
new file mode 100644
index 000000000..f3e01e42c
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/interfaces.go
@@ -0,0 +1,48 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package crypto
+
+import (
+	"github.com/dexon-foundation/dexon-consensus/common"
+)
+
+// Signature is the basic signature type in DEXON.
+type Signature struct {
+	Type      string
+	Signature []byte
+}
+
+// PrivateKey describes the asymmetric cryptography interface that interacts
+// with the private key.
+type PrivateKey interface {
+	// PublicKey returns the public key associate this private key.
+	PublicKey() PublicKey
+
+	// Sign calculates a signature.
+	Sign(hash common.Hash) (Signature, error)
+}
+
+// PublicKey describes the asymmetric cryptography interface that interacts
+// with the public key.
+type PublicKey interface {
+	// VerifySignature checks that the given public key created signature over hash.
+	VerifySignature(hash common.Hash, signature Signature) bool
+
+	// Bytes returns the []byte representation of public key.
+	Bytes() []byte
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/utils.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/utils.go
new file mode 100644
index 000000000..59e91f5a5
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/utils.go
@@ -0,0 +1,80 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package crypto
+
+import (
+	"encoding/hex"
+	"fmt"
+
+	"github.com/dexon-foundation/dexon/crypto"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+)
+
+var (
+	// ErrSigToPubTypeNotFound is reported if the type is already used.
+	ErrSigToPubTypeNotFound = fmt.Errorf("type of sigToPub is not found")
+
+	// ErrSigToPubTypeAlreadyExist is reported if the type is already used.
+	ErrSigToPubTypeAlreadyExist = fmt.Errorf("type of sigToPub is already exist")
+)
+
+// SigToPubFn is a function to recover public key from signature.
+type SigToPubFn func(hash common.Hash, signature Signature) (PublicKey, error)
+
+var sigToPubCB map[string]SigToPubFn
+
+func init() {
+	sigToPubCB = make(map[string]SigToPubFn)
+}
+
+// Keccak256Hash calculates and returns the Keccak256 hash of the input data,
+// converting it to an internal Hash data structure.
+func Keccak256Hash(data ...[]byte) (h common.Hash) {
+	return common.Hash(crypto.Keccak256Hash(data...))
+}
+
+// Clone returns a deep copy of a signature.
+func (sig Signature) Clone() Signature {
+	return Signature{
+		Type:      sig.Type,
+		Signature: sig.Signature[:],
+	}
+}
+
+func (sig Signature) String() string {
+	return hex.EncodeToString([]byte(sig.Signature[:]))
+}
+
+// RegisterSigToPub registers a sigToPub function of type.
+func RegisterSigToPub(sigType string, sigToPub SigToPubFn) error {
+	if _, exist := sigToPubCB[sigType]; exist {
+		return ErrSigToPubTypeAlreadyExist
+	}
+	sigToPubCB[sigType] = sigToPub
+	return nil
+}
+
+// SigToPub recovers public key from signature.
+func SigToPub(hash common.Hash, signature Signature) (PublicKey, error) {
+	sigToPub, exist := sigToPubCB[signature.Type]
+	if !exist {
+		return nil, ErrSigToPubTypeNotFound
+	}
+	return sigToPub(hash, signature)
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/dkg-tsig-protocol.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/dkg-tsig-protocol.go
new file mode 100644
index 000000000..6645ecbae
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/dkg-tsig-protocol.go
@@ -0,0 +1,578 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto/dkg"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
+)
+
+// Errors for dkg module.
+var (
+	ErrNotDKGParticipant = fmt.Errorf(
+		"not a DKG participant")
+	ErrNotQualifyDKGParticipant = fmt.Errorf(
+		"not a qualified DKG participant")
+	ErrIDShareNotFound = fmt.Errorf(
+		"private share not found for specific ID")
+	ErrNotReachThreshold = fmt.Errorf(
+		"threshold not reach")
+	ErrInvalidThreshold = fmt.Errorf(
+		"invalid threshold")
+	ErrIncorrectPrivateShareSignature = fmt.Errorf(
+		"incorrect private share signature")
+	ErrMismatchPartialSignatureHash = fmt.Errorf(
+		"mismatch partialSignature hash")
+	ErrIncorrectPartialSignatureSignature = fmt.Errorf(
+		"incorrect partialSignature signature")
+	ErrIncorrectPartialSignature = fmt.Errorf(
+		"incorrect partialSignature")
+	ErrNotEnoughtPartialSignatures = fmt.Errorf(
+		"not enough of partial signatures")
+	ErrRoundAlreadyPurged = fmt.Errorf(
+		"cache of round already been purged")
+)
+
+type dkgReceiver interface {
+	// ProposeDKGComplaint proposes a DKGComplaint.
+	ProposeDKGComplaint(complaint *typesDKG.Complaint)
+
+	// ProposeDKGMasterPublicKey propose a DKGMasterPublicKey.
+	ProposeDKGMasterPublicKey(mpk *typesDKG.MasterPublicKey)
+
+	// ProposeDKGPrivateShare propose a DKGPrivateShare.
+	ProposeDKGPrivateShare(prv *typesDKG.PrivateShare)
+
+	// ProposeDKGAntiNackComplaint propose a DKGPrivateShare as an anti complaint.
+	ProposeDKGAntiNackComplaint(prv *typesDKG.PrivateShare)
+
+	// ProposeDKGFinalize propose a DKGFinalize message.
+	ProposeDKGFinalize(final *typesDKG.Finalize)
+}
+
+type dkgProtocol struct {
+	ID                 types.NodeID
+	recv               dkgReceiver
+	round              uint64
+	threshold          int
+	idMap              map[types.NodeID]dkg.ID
+	mpkMap             map[types.NodeID]*dkg.PublicKeyShares
+	masterPrivateShare *dkg.PrivateKeyShares
+	prvShares          *dkg.PrivateKeyShares
+	prvSharesReceived  map[types.NodeID]struct{}
+	nodeComplained     map[types.NodeID]struct{}
+	// Complaint[from][to]'s anti is saved to antiComplaint[from][to].
+	antiComplaintReceived map[types.NodeID]map[types.NodeID]struct{}
+}
+
+type dkgShareSecret struct {
+	privateKey *dkg.PrivateKey
+}
+
+// DKGGroupPublicKey is the result of DKG protocol.
+type DKGGroupPublicKey struct {
+	round          uint64
+	qualifyIDs     dkg.IDs
+	qualifyNodeIDs map[types.NodeID]struct{}
+	idMap          map[types.NodeID]dkg.ID
+	publicKeys     map[types.NodeID]*dkg.PublicKey
+	groupPublicKey *dkg.PublicKey
+	threshold      int
+}
+
+// TSigVerifier is the interface verifying threshold signature.
+type TSigVerifier interface {
+	VerifySignature(hash common.Hash, sig crypto.Signature) bool
+}
+
+// TSigVerifierCacheInterface specifies interface used by TSigVerifierCache.
+type TSigVerifierCacheInterface interface {
+	// Configuration returns the configuration at a given round.
+	// Return the genesis configuration if round == 0.
+	Configuration(round uint64) *types.Config
+
+	// DKGComplaints gets all the DKGComplaints of round.
+	DKGComplaints(round uint64) []*typesDKG.Complaint
+
+	// DKGMasterPublicKeys gets all the DKGMasterPublicKey of round.
+	DKGMasterPublicKeys(round uint64) []*typesDKG.MasterPublicKey
+
+	// IsDKGFinal checks if DKG is final.
+	IsDKGFinal(round uint64) bool
+}
+
+// TSigVerifierCache is the cache for TSigVerifier.
+type TSigVerifierCache struct {
+	intf      TSigVerifierCacheInterface
+	verifier  map[uint64]TSigVerifier
+	minRound  uint64
+	cacheSize int
+	lock      sync.RWMutex
+}
+
+type tsigProtocol struct {
+	groupPublicKey *DKGGroupPublicKey
+	hash           common.Hash
+	sigs           map[dkg.ID]dkg.PartialSignature
+	threshold      int
+}
+
+func newDKGID(ID types.NodeID) dkg.ID {
+	return dkg.NewID(ID.Hash[:])
+}
+
+func newDKGProtocol(
+	ID types.NodeID,
+	recv dkgReceiver,
+	round uint64,
+	threshold int) *dkgProtocol {
+
+	prvShare, pubShare := dkg.NewPrivateKeyShares(threshold)
+
+	recv.ProposeDKGMasterPublicKey(&typesDKG.MasterPublicKey{
+		ProposerID:      ID,
+		Round:           round,
+		DKGID:           newDKGID(ID),
+		PublicKeyShares: *pubShare,
+	})
+
+	return &dkgProtocol{
+		ID:                    ID,
+		recv:                  recv,
+		round:                 round,
+		threshold:             threshold,
+		idMap:                 make(map[types.NodeID]dkg.ID),
+		mpkMap:                make(map[types.NodeID]*dkg.PublicKeyShares),
+		masterPrivateShare:    prvShare,
+		prvShares:             dkg.NewEmptyPrivateKeyShares(),
+		prvSharesReceived:     make(map[types.NodeID]struct{}),
+		nodeComplained:        make(map[types.NodeID]struct{}),
+		antiComplaintReceived: make(map[types.NodeID]map[types.NodeID]struct{}),
+	}
+}
+
+func (d *dkgProtocol) processMasterPublicKeys(
+	mpks []*typesDKG.MasterPublicKey) error {
+	d.idMap = make(map[types.NodeID]dkg.ID, len(mpks))
+	d.mpkMap = make(map[types.NodeID]*dkg.PublicKeyShares, len(mpks))
+	d.prvSharesReceived = make(map[types.NodeID]struct{}, len(mpks))
+	ids := make(dkg.IDs, len(mpks))
+	for i := range mpks {
+		nID := mpks[i].ProposerID
+		d.idMap[nID] = mpks[i].DKGID
+		d.mpkMap[nID] = &mpks[i].PublicKeyShares
+		ids[i] = mpks[i].DKGID
+	}
+	d.masterPrivateShare.SetParticipants(ids)
+	for _, mpk := range mpks {
+		share, ok := d.masterPrivateShare.Share(mpk.DKGID)
+		if !ok {
+			return ErrIDShareNotFound
+		}
+		d.recv.ProposeDKGPrivateShare(&typesDKG.PrivateShare{
+			ProposerID:   d.ID,
+			ReceiverID:   mpk.ProposerID,
+			Round:        d.round,
+			PrivateShare: *share,
+		})
+	}
+	return nil
+}
+
+func (d *dkgProtocol) proposeNackComplaints() {
+	for nID := range d.mpkMap {
+		if _, exist := d.prvSharesReceived[nID]; exist {
+			continue
+		}
+		d.recv.ProposeDKGComplaint(&typesDKG.Complaint{
+			ProposerID: d.ID,
+			Round:      d.round,
+			PrivateShare: typesDKG.PrivateShare{
+				ProposerID: nID,
+				Round:      d.round,
+			},
+		})
+	}
+}
+
+func (d *dkgProtocol) processNackComplaints(complaints []*typesDKG.Complaint) (
+	err error) {
+	for _, complaint := range complaints {
+		if !complaint.IsNack() {
+			continue
+		}
+		if complaint.PrivateShare.ProposerID != d.ID {
+			continue
+		}
+		id, exist := d.idMap[complaint.ProposerID]
+		if !exist {
+			err = ErrNotDKGParticipant
+			continue
+		}
+		share, ok := d.masterPrivateShare.Share(id)
+		if !ok {
+			err = ErrIDShareNotFound
+			continue
+		}
+		d.recv.ProposeDKGAntiNackComplaint(&typesDKG.PrivateShare{
+			ProposerID:   d.ID,
+			ReceiverID:   complaint.ProposerID,
+			Round:        d.round,
+			PrivateShare: *share,
+		})
+	}
+	return
+}
+
+func (d *dkgProtocol) enforceNackComplaints(complaints []*typesDKG.Complaint) {
+	for _, complaint := range complaints {
+		if !complaint.IsNack() {
+			continue
+		}
+		to := complaint.PrivateShare.ProposerID
+		// Do not propose nack complaint to itself.
+		if to == d.ID {
+			continue
+		}
+		from := complaint.ProposerID
+		// Nack complaint is already proposed.
+		if from == d.ID {
+			continue
+		}
+		if _, exist :=
+			d.antiComplaintReceived[from][to]; !exist {
+			d.recv.ProposeDKGComplaint(&typesDKG.Complaint{
+				ProposerID: d.ID,
+				Round:      d.round,
+				PrivateShare: typesDKG.PrivateShare{
+					ProposerID: to,
+					Round:      d.round,
+				},
+			})
+		}
+	}
+}
+
+func (d *dkgProtocol) sanityCheck(prvShare *typesDKG.PrivateShare) error {
+	if _, exist := d.idMap[prvShare.ProposerID]; !exist {
+		return ErrNotDKGParticipant
+	}
+	ok, err := verifyDKGPrivateShareSignature(prvShare)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return ErrIncorrectPrivateShareSignature
+	}
+	return nil
+}
+
+func (d *dkgProtocol) processPrivateShare(
+	prvShare *typesDKG.PrivateShare) error {
+	if d.round != prvShare.Round {
+		return nil
+	}
+	receiverID, exist := d.idMap[prvShare.ReceiverID]
+	// This node is not a DKG participant, ignore the private share.
+	if !exist {
+		return nil
+	}
+	if err := d.sanityCheck(prvShare); err != nil {
+		return err
+	}
+	mpk := d.mpkMap[prvShare.ProposerID]
+	ok, err := mpk.VerifyPrvShare(receiverID, &prvShare.PrivateShare)
+	if err != nil {
+		return err
+	}
+	if prvShare.ReceiverID == d.ID {
+		d.prvSharesReceived[prvShare.ProposerID] = struct{}{}
+	}
+	if !ok {
+		if _, exist := d.nodeComplained[prvShare.ProposerID]; exist {
+			return nil
+		}
+		complaint := &typesDKG.Complaint{
+			ProposerID:   d.ID,
+			Round:        d.round,
+			PrivateShare: *prvShare,
+		}
+		d.nodeComplained[prvShare.ProposerID] = struct{}{}
+		d.recv.ProposeDKGComplaint(complaint)
+	} else if prvShare.ReceiverID == d.ID {
+		sender := d.idMap[prvShare.ProposerID]
+		if err := d.prvShares.AddShare(sender, &prvShare.PrivateShare); err != nil {
+			return err
+		}
+	} else {
+		// The prvShare is an anti complaint.
+		if _, exist := d.antiComplaintReceived[prvShare.ReceiverID]; !exist {
+			d.antiComplaintReceived[prvShare.ReceiverID] =
+				make(map[types.NodeID]struct{})
+			d.recv.ProposeDKGAntiNackComplaint(prvShare)
+		}
+		d.antiComplaintReceived[prvShare.ReceiverID][prvShare.ProposerID] =
+			struct{}{}
+	}
+	return nil
+}
+
+func (d *dkgProtocol) proposeFinalize() {
+	d.recv.ProposeDKGFinalize(&typesDKG.Finalize{
+		ProposerID: d.ID,
+		Round:      d.round,
+	})
+}
+
+func (d *dkgProtocol) recoverShareSecret(qualifyIDs dkg.IDs) (
+	*dkgShareSecret, error) {
+	if len(qualifyIDs) < d.threshold {
+		return nil, ErrNotReachThreshold
+	}
+	prvKey, err := d.prvShares.RecoverPrivateKey(qualifyIDs)
+	if err != nil {
+		return nil, err
+	}
+	return &dkgShareSecret{
+		privateKey: prvKey,
+	}, nil
+}
+
+func (ss *dkgShareSecret) sign(hash common.Hash) dkg.PartialSignature {
+	// DKG sign will always success.
+	sig, _ := ss.privateKey.Sign(hash)
+	return dkg.PartialSignature(sig)
+}
+
+// NewDKGGroupPublicKey creats a DKGGroupPublicKey instance.
+func NewDKGGroupPublicKey(
+	round uint64,
+	mpks []*typesDKG.MasterPublicKey, complaints []*typesDKG.Complaint,
+	threshold int) (
+	*DKGGroupPublicKey, error) {
+
+	if len(mpks) < threshold {
+		return nil, ErrInvalidThreshold
+	}
+
+	// Calculate qualify members.
+	disqualifyIDs := map[types.NodeID]struct{}{}
+	complaintsByID := map[types.NodeID]int{}
+	for _, complaint := range complaints {
+		if complaint.IsNack() {
+			complaintsByID[complaint.PrivateShare.ProposerID]++
+		} else {
+			disqualifyIDs[complaint.PrivateShare.ProposerID] = struct{}{}
+		}
+	}
+	for nID, num := range complaintsByID {
+		if num > threshold {
+			disqualifyIDs[nID] = struct{}{}
+		}
+	}
+	qualifyIDs := make(dkg.IDs, 0, len(mpks)-len(disqualifyIDs))
+	qualifyNodeIDs := make(map[types.NodeID]struct{})
+	mpkMap := make(map[dkg.ID]*typesDKG.MasterPublicKey, cap(qualifyIDs))
+	idMap := make(map[types.NodeID]dkg.ID)
+	for _, mpk := range mpks {
+		if _, exist := disqualifyIDs[mpk.ProposerID]; exist {
+			continue
+		}
+		mpkMap[mpk.DKGID] = mpk
+		idMap[mpk.ProposerID] = mpk.DKGID
+		qualifyIDs = append(qualifyIDs, mpk.DKGID)
+		qualifyNodeIDs[mpk.ProposerID] = struct{}{}
+	}
+	// Recover qualify members' public key.
+	pubKeys := make(map[types.NodeID]*dkg.PublicKey, len(qualifyIDs))
+	for _, recvID := range qualifyIDs {
+		pubShares := dkg.NewEmptyPublicKeyShares()
+		for _, id := range qualifyIDs {
+			pubShare, err := mpkMap[id].PublicKeyShares.Share(recvID)
+			if err != nil {
+				return nil, err
+			}
+			if err := pubShares.AddShare(id, pubShare); err != nil {
+				return nil, err
+			}
+		}
+		pubKey, err := pubShares.RecoverPublicKey(qualifyIDs)
+		if err != nil {
+			return nil, err
+		}
+		pubKeys[mpkMap[recvID].ProposerID] = pubKey
+	}
+	// Recover Group Public Key.
+	pubShares := make([]*dkg.PublicKeyShares, 0, len(qualifyIDs))
+	for _, id := range qualifyIDs {
+		pubShares = append(pubShares, &mpkMap[id].PublicKeyShares)
+	}
+	groupPK := dkg.RecoverGroupPublicKey(pubShares)
+	return &DKGGroupPublicKey{
+		round:          round,
+		qualifyIDs:     qualifyIDs,
+		qualifyNodeIDs: qualifyNodeIDs,
+		idMap:          idMap,
+		publicKeys:     pubKeys,
+		threshold:      threshold,
+		groupPublicKey: groupPK,
+	}, nil
+}
+
+// VerifySignature verifies if the signature is correct.
+func (gpk *DKGGroupPublicKey) VerifySignature(
+	hash common.Hash, sig crypto.Signature) bool {
+	return gpk.groupPublicKey.VerifySignature(hash, sig)
+}
+
+// NewTSigVerifierCache creats a DKGGroupPublicKey instance.
+func NewTSigVerifierCache(
+	intf TSigVerifierCacheInterface, cacheSize int) *TSigVerifierCache {
+	return &TSigVerifierCache{
+		intf:      intf,
+		verifier:  make(map[uint64]TSigVerifier),
+		cacheSize: cacheSize,
+	}
+}
+
+// UpdateAndGet calls Update and then Get.
+func (tc *TSigVerifierCache) UpdateAndGet(round uint64) (
+	TSigVerifier, bool, error) {
+	ok, err := tc.Update(round)
+	if err != nil {
+		return nil, false, err
+	}
+	if !ok {
+		return nil, false, nil
+	}
+	v, ok := tc.Get(round)
+	return v, ok, nil
+}
+
+// Update the cache and returns if success.
+func (tc *TSigVerifierCache) Update(round uint64) (bool, error) {
+	tc.lock.Lock()
+	defer tc.lock.Unlock()
+	if round < tc.minRound {
+		return false, ErrRoundAlreadyPurged
+	}
+	if _, exist := tc.verifier[round]; exist {
+		return true, nil
+	}
+	if !tc.intf.IsDKGFinal(round) {
+		return false, nil
+	}
+	gpk, err := NewDKGGroupPublicKey(round,
+		tc.intf.DKGMasterPublicKeys(round),
+		tc.intf.DKGComplaints(round),
+		int(tc.intf.Configuration(round).DKGSetSize/3)+1)
+	if err != nil {
+		return false, err
+	}
+	if len(tc.verifier) == 0 {
+		tc.minRound = round
+	}
+	tc.verifier[round] = gpk
+	if len(tc.verifier) > tc.cacheSize {
+		delete(tc.verifier, tc.minRound)
+	}
+	for {
+		if _, exist := tc.verifier[tc.minRound]; !exist {
+			tc.minRound++
+		} else {
+			break
+		}
+	}
+	return true, nil
+}
+
+// Get the TSigVerifier of round and returns if it exists.
+func (tc *TSigVerifierCache) Get(round uint64) (TSigVerifier, bool) {
+	tc.lock.RLock()
+	defer tc.lock.RUnlock()
+	verifier, exist := tc.verifier[round]
+	return verifier, exist
+}
+
+func newTSigProtocol(
+	gpk *DKGGroupPublicKey,
+	hash common.Hash) *tsigProtocol {
+	return &tsigProtocol{
+		groupPublicKey: gpk,
+		hash:           hash,
+		sigs:           make(map[dkg.ID]dkg.PartialSignature, gpk.threshold+1),
+	}
+}
+
+func (tsig *tsigProtocol) sanityCheck(psig *typesDKG.PartialSignature) error {
+	_, exist := tsig.groupPublicKey.publicKeys[psig.ProposerID]
+	if !exist {
+		return ErrNotQualifyDKGParticipant
+	}
+	ok, err := verifyDKGPartialSignatureSignature(psig)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return ErrIncorrectPartialSignatureSignature
+	}
+	if psig.Hash != tsig.hash {
+		return ErrMismatchPartialSignatureHash
+	}
+	return nil
+}
+
+func (tsig *tsigProtocol) processPartialSignature(
+	psig *typesDKG.PartialSignature) error {
+	if psig.Round != tsig.groupPublicKey.round {
+		return nil
+	}
+	id, exist := tsig.groupPublicKey.idMap[psig.ProposerID]
+	if !exist {
+		return ErrNotQualifyDKGParticipant
+	}
+	if err := tsig.sanityCheck(psig); err != nil {
+		return err
+	}
+	pubKey := tsig.groupPublicKey.publicKeys[psig.ProposerID]
+	if !pubKey.VerifySignature(
+		tsig.hash, crypto.Signature(psig.PartialSignature)) {
+		return ErrIncorrectPartialSignature
+	}
+	tsig.sigs[id] = psig.PartialSignature
+	return nil
+}
+
+func (tsig *tsigProtocol) signature() (crypto.Signature, error) {
+	if len(tsig.sigs) < tsig.groupPublicKey.threshold {
+		return crypto.Signature{}, ErrNotEnoughtPartialSignatures
+	}
+	ids := make(dkg.IDs, 0, len(tsig.sigs))
+	psigs := make([]dkg.PartialSignature, 0, len(tsig.sigs))
+	for id, psig := range tsig.sigs {
+		ids = append(ids, id)
+		psigs = append(psigs, psig)
+	}
+	return dkg.RecoverSignature(psigs, ids)
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/interfaces.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/interfaces.go
new file mode 100644
index 000000000..75a2fdfcf
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/interfaces.go
@@ -0,0 +1,145 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
+)
+
+// Application describes the application interface that interacts with DEXON
+// consensus core.
+type Application interface {
+	// PreparePayload is called when consensus core is preparing a block.
+	PreparePayload(position types.Position) ([]byte, error)
+
+	// PrepareWitness will return the witness data no lower than consensusHeight.
+	PrepareWitness(consensusHeight uint64) (types.Witness, error)
+
+	// VerifyBlock verifies if the block is valid.
+	VerifyBlock(block *types.Block) types.BlockVerifyStatus
+
+	// BlockConfirmed is called when a block is confirmed and added to lattice.
+	BlockConfirmed(block types.Block)
+
+	// BlockDelivered is called when a block is add to the compaction chain.
+	BlockDelivered(blockHash common.Hash, result types.FinalizationResult)
+}
+
+// Debug describes the application interface that requires
+// more detailed consensus execution.
+type Debug interface {
+	// StronglyAcked is called when a block is strongly acked.
+	StronglyAcked(blockHash common.Hash)
+
+	// TotalOrderingDelivered is called when the total ordering algorithm deliver
+	// a set of block.
+	TotalOrderingDelivered(common.Hashes, uint32)
+}
+
+// Network describs the network interface that interacts with DEXON consensus
+// core.
+type Network interface {
+	// PullBlocks tries to pull blocks from the DEXON network.
+	PullBlocks(hashes common.Hashes)
+
+	// PullVotes tries to pull votes from the DEXON network.
+	PullVotes(position types.Position)
+
+	// BroadcastVote broadcasts vote to all nodes in DEXON network.
+	BroadcastVote(vote *types.Vote)
+
+	// BroadcastBlock broadcasts block to all nodes in DEXON network.
+	BroadcastBlock(block *types.Block)
+
+	// BroadcastAgreementResult broadcasts agreement result to DKG set.
+	BroadcastAgreementResult(randRequest *types.AgreementResult)
+
+	// BroadcastRandomnessResult broadcasts rand request to Notary set.
+	BroadcastRandomnessResult(randResult *types.BlockRandomnessResult)
+
+	// SendDKGPrivateShare sends PrivateShare to a DKG participant.
+	SendDKGPrivateShare(pub crypto.PublicKey, prvShare *typesDKG.PrivateShare)
+
+	// BroadcastDKGPrivateShare broadcasts PrivateShare to all DKG participants.
+	BroadcastDKGPrivateShare(prvShare *typesDKG.PrivateShare)
+
+	// BroadcastDKGPartialSignature broadcasts partialSignature to all
+	// DKG participants.
+	BroadcastDKGPartialSignature(psig *typesDKG.PartialSignature)
+
+	// ReceiveChan returns a channel to receive messages from DEXON network.
+	ReceiveChan() <-chan interface{}
+}
+
+// Governance interface specifies interface to control the governance contract.
+// Note that there are a lot more methods in the governance contract, that this
+// interface only define those that are required to run the consensus algorithm.
+type Governance interface {
+	// Configuration returns the configuration at a given round.
+	// Return the genesis configuration if round == 0.
+	Configuration(round uint64) *types.Config
+
+	// CRS returns the CRS for a given round.
+	// Return the genesis CRS if round == 0.
+	CRS(round uint64) common.Hash
+
+	// Propose a CRS of round.
+	ProposeCRS(round uint64, signedCRS []byte)
+
+	// NodeSet returns the node set at a given round.
+	// Return the genesis node set if round == 0.
+	NodeSet(round uint64) []crypto.PublicKey
+
+	// NotifyRoundHeight notifies governance contract to generate configuration
+	// for that round with the block on that consensus height.
+	NotifyRoundHeight(targetRound, consensusHeight uint64)
+
+	//// DKG-related methods.
+
+	// AddDKGComplaint adds a DKGComplaint.
+	AddDKGComplaint(round uint64, complaint *typesDKG.Complaint)
+
+	// DKGComplaints gets all the DKGComplaints of round.
+	DKGComplaints(round uint64) []*typesDKG.Complaint
+
+	// AddDKGMasterPublicKey adds a DKGMasterPublicKey.
+	AddDKGMasterPublicKey(round uint64, masterPublicKey *typesDKG.MasterPublicKey)
+
+	// DKGMasterPublicKeys gets all the DKGMasterPublicKey of round.
+	DKGMasterPublicKeys(round uint64) []*typesDKG.MasterPublicKey
+
+	// AddDKGFinalize adds a DKG finalize message.
+	AddDKGFinalize(round uint64, final *typesDKG.Finalize)
+
+	// IsDKGFinal checks if DKG is final.
+	IsDKGFinal(round uint64) bool
+}
+
+// Ticker define the capability to tick by interval.
+type Ticker interface {
+	// Tick would return a channel, which would be triggered until next tick.
+	Tick() <-chan time.Time
+
+	// Stop the ticker.
+	Stop()
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/lattice-data.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/lattice-data.go
new file mode 100644
index 000000000..564675730
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/lattice-data.go
@@ -0,0 +1,645 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"errors"
+	"fmt"
+	"sort"
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/blockdb"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+// Errors for sanity check error.
+var (
+	ErrDuplicatedAckOnOneChain = fmt.Errorf("duplicated ack on one chain")
+	ErrInvalidChainID          = fmt.Errorf("invalid chain id")
+	ErrInvalidProposerID       = fmt.Errorf("invalid proposer id")
+	ErrInvalidWitness          = fmt.Errorf("invalid witness data")
+	ErrInvalidBlock            = fmt.Errorf("invalid block")
+	ErrNotAckParent            = fmt.Errorf("not ack parent")
+	ErrDoubleAck               = fmt.Errorf("double ack")
+	ErrAcksNotSorted           = fmt.Errorf("acks not sorted")
+	ErrInvalidBlockHeight      = fmt.Errorf("invalid block height")
+	ErrAlreadyInLattice        = fmt.Errorf("block already in lattice")
+	ErrIncorrectBlockTime      = fmt.Errorf("block timestamp is incorrect")
+	ErrInvalidRoundID          = fmt.Errorf("invalid round id")
+	ErrUnknownRoundID          = fmt.Errorf("unknown round id")
+	ErrRoundOutOfRange         = fmt.Errorf("round out of range")
+	ErrRoundNotSwitch          = fmt.Errorf("round not switch")
+	ErrNotGenesisBlock         = fmt.Errorf("not a genesis block")
+	ErrUnexpectedGenesisBlock  = fmt.Errorf("unexpected genesis block")
+)
+
+// ErrAckingBlockNotExists is for sanity check error.
+type ErrAckingBlockNotExists struct {
+	hash common.Hash
+}
+
+func (e ErrAckingBlockNotExists) Error() string {
+	return fmt.Sprintf("acking block %s not exists", e.hash)
+}
+
+// Errors for method usage
+var (
+	ErrRoundNotIncreasing     = errors.New("round not increasing")
+	ErrPurgedBlockNotFound    = errors.New("purged block not found")
+	ErrPurgeNotDeliveredBlock = errors.New("not purge from head")
+)
+
+// latticeDataConfig is the configuration for latticeData for each round.
+type latticeDataConfig struct {
+	roundBasedConfig
+	// Number of chains between runs
+	numChains uint32
+	// Block interval specifies reasonable time difference between
+	// parent/child blocks.
+	minBlockTimeInterval time.Duration
+	maxBlockTimeInterval time.Duration
+}
+
+// Initiate latticeDataConfig from types.Config.
+func (config *latticeDataConfig) fromConfig(roundID uint64, cfg *types.Config) {
+	config.numChains = cfg.NumChains
+	config.minBlockTimeInterval = cfg.MinBlockInterval
+	config.maxBlockTimeInterval = cfg.MaxBlockInterval
+	config.setupRoundBasedFields(roundID, cfg)
+}
+
+// Check if timestamp of a block is valid according to a reference time.
+func (config *latticeDataConfig) isValidBlockTime(
+	b *types.Block, ref time.Time) bool {
+	return !(b.Timestamp.Before(ref.Add(config.minBlockTimeInterval)) ||
+		b.Timestamp.After(ref.Add(config.maxBlockTimeInterval)))
+}
+
+// isValidGenesisBlockTime check if a timestamp is valid for a genesis block.
+func (config *latticeDataConfig) isValidGenesisBlockTime(b *types.Block) bool {
+	return !(b.Timestamp.Before(config.roundBeginTime) || b.Timestamp.After(
+		config.roundBeginTime.Add(config.maxBlockTimeInterval)))
+}
+
+// newGenesisLatticeDataConfig constructs a latticeDataConfig instance.
+func newGenesisLatticeDataConfig(
+	dMoment time.Time, config *types.Config) *latticeDataConfig {
+	c := &latticeDataConfig{}
+	c.fromConfig(0, config)
+	c.setRoundBeginTime(dMoment)
+	return c
+}
+
+// newLatticeDataConfig constructs a latticeDataConfig instance.
+func newLatticeDataConfig(
+	prev *latticeDataConfig, cur *types.Config) *latticeDataConfig {
+	c := &latticeDataConfig{}
+	c.fromConfig(prev.roundID+1, cur)
+	c.setRoundBeginTime(prev.roundEndTime)
+	return c
+}
+
+// latticeData is a module for storing lattice.
+type latticeData struct {
+	// we need blockdb to read blocks purged from cache in memory.
+	db blockdb.Reader
+	// chains stores chains' blocks and other info.
+	chains []*chainStatus
+	// blockByHash stores blocks, indexed by block hash.
+	blockByHash map[common.Hash]*types.Block
+	// This stores configuration for each round.
+	configs []*latticeDataConfig
+}
+
+// newLatticeData creates a new latticeData struct.
+func newLatticeData(
+	db blockdb.Reader, genesisConfig *latticeDataConfig) (data *latticeData) {
+	data = &latticeData{
+		db:          db,
+		chains:      make([]*chainStatus, genesisConfig.numChains),
+		blockByHash: make(map[common.Hash]*types.Block),
+		configs:     []*latticeDataConfig{genesisConfig},
+	}
+	for i := range data.chains {
+		data.chains[i] = &chainStatus{
+			ID:         uint32(i),
+			blocks:     []*types.Block{},
+			lastAckPos: make([]*types.Position, genesisConfig.numChains),
+		}
+	}
+	return
+}
+
+func (data *latticeData) checkAckingRelations(b *types.Block) error {
+	acksByChainID := make(map[uint32]struct{}, len(data.chains))
+	for _, hash := range b.Acks {
+		bAck, err := data.findBlock(hash)
+		if err != nil {
+			if err == blockdb.ErrBlockDoesNotExist {
+				return &ErrAckingBlockNotExists{hash}
+			}
+			return err
+		}
+		// Check if it acks blocks from old rounds, the allowed round difference
+		// is 1.
+		if DiffUint64(bAck.Position.Round, b.Position.Round) > 1 {
+			return ErrRoundOutOfRange
+		}
+		// Check if it acks older blocks than blocks on the same chain.
+		lastAckPos :=
+			data.chains[bAck.Position.ChainID].lastAckPos[b.Position.ChainID]
+		if lastAckPos != nil && !bAck.Position.Newer(lastAckPos) {
+			return ErrDoubleAck
+		}
+		// Check if ack two blocks on the same chain. This would need
+		// to check after we replace map with slice for acks.
+		if _, acked := acksByChainID[bAck.Position.ChainID]; acked {
+			return ErrDuplicatedAckOnOneChain
+		}
+		acksByChainID[bAck.Position.ChainID] = struct{}{}
+	}
+	return nil
+}
+
+func (data *latticeData) sanityCheck(b *types.Block) error {
+	// TODO(mission): Check if its proposer is in validator set somewhere,
+	//                lattice doesn't have to know about node set.
+	config := data.getConfig(b.Position.Round)
+	if config == nil {
+		return ErrInvalidRoundID
+	}
+	// Check if the chain id is valid.
+	if b.Position.ChainID >= config.numChains {
+		return ErrInvalidChainID
+	}
+	// Make sure parent block is arrived.
+	chain := data.chains[b.Position.ChainID]
+	chainTip := chain.tip
+	if chainTip == nil {
+		if !b.ParentHash.Equal(common.Hash{}) {
+			return &ErrAckingBlockNotExists{b.ParentHash}
+		}
+		if !b.IsGenesis() {
+			return ErrNotGenesisBlock
+		}
+		if !config.isValidGenesisBlockTime(b) {
+			return ErrIncorrectBlockTime
+		}
+		return data.checkAckingRelations(b)
+	}
+	// Check parent block if parent hash is specified.
+	if !b.ParentHash.Equal(common.Hash{}) {
+		if !b.ParentHash.Equal(chainTip.Hash) {
+			return &ErrAckingBlockNotExists{b.ParentHash}
+		}
+		if !b.IsAcking(b.ParentHash) {
+			return ErrNotAckParent
+		}
+	}
+	chainTipConfig := data.getConfig(chainTip.Position.Round)
+	// Round can't be rewinded.
+	if chainTip.Position.Round > b.Position.Round {
+		return ErrInvalidRoundID
+	}
+	checkTip := false
+	if chainTip.Timestamp.After(chainTipConfig.roundEndTime) {
+		// Round switching should happen when chainTip already pass
+		// round end time of its round.
+		if chainTip.Position.Round == b.Position.Round {
+			return ErrRoundNotSwitch
+		}
+		// The round ID is continuous.
+		if b.Position.Round-chainTip.Position.Round == 1 {
+			checkTip = true
+		} else {
+			// This block should be genesis block of new round because round
+			// ID is not continuous.
+			if !b.IsGenesis() {
+				return ErrNotGenesisBlock
+			}
+			if !config.isValidGenesisBlockTime(b) {
+				return ErrIncorrectBlockTime
+			}
+			// TODO(mission): make sure rounds between chainTip and current block
+			//                don't expect blocks from this chain.
+		}
+	} else {
+		if chainTip.Position.Round != b.Position.Round {
+			// Round should not switch.
+			return ErrInvalidRoundID
+		}
+		checkTip = true
+	}
+	// Validate the relation between chain tip when needed.
+	if checkTip {
+		if b.Position.Height != chainTip.Position.Height+1 {
+			return ErrInvalidBlockHeight
+		}
+		if b.Witness.Height < chainTip.Witness.Height {
+			return ErrInvalidWitness
+		}
+		if !config.isValidBlockTime(b, chainTip.Timestamp) {
+			return ErrIncorrectBlockTime
+		}
+		// Chain tip should be acked.
+		if !b.IsAcking(chainTip.Hash) {
+			return ErrNotAckParent
+		}
+	}
+	if err := data.checkAckingRelations(b); err != nil {
+		return err
+	}
+	return nil
+}
+
+// addBlock processes block, it does sanity check, inserts block into
+// lattice and deletes blocks which will not be used.
+func (data *latticeData) addBlock(
+	block *types.Block) (deliverable []*types.Block, err error) {
+	var (
+		bAck    *types.Block
+		updated bool
+	)
+	data.chains[block.Position.ChainID].addBlock(block)
+	data.blockByHash[block.Hash] = block
+	// Update lastAckPos.
+	for _, ack := range block.Acks {
+		if bAck, err = data.findBlock(ack); err != nil {
+			if err == blockdb.ErrBlockDoesNotExist {
+				err = nil
+				continue
+			}
+			return
+		}
+		data.chains[bAck.Position.ChainID].lastAckPos[block.Position.ChainID] =
+			bAck.Position.Clone()
+	}
+
+	// Extract blocks that deliverable to total ordering.
+	// A block is deliverable to total ordering iff:
+	//  - All its acking blocks are delivered to total ordering.
+	for {
+		updated = false
+		for _, status := range data.chains {
+			if status.nextOutputIndex >= len(status.blocks) {
+				continue
+			}
+			tip := status.blocks[status.nextOutputIndex]
+			allAckingBlockDelivered := true
+			for _, ack := range tip.Acks {
+				if bAck, err = data.findBlock(ack); err != nil {
+					if err == blockdb.ErrBlockDoesNotExist {
+						err = nil
+						allAckingBlockDelivered = false
+						break
+					}
+					return
+				}
+				// Check if this block is outputed or not.
+				idx := data.chains[bAck.Position.ChainID].findBlock(
+					&bAck.Position)
+				var ok bool
+				if idx == -1 {
+					// Either the block is delivered or not added to chain yet.
+					if out :=
+						data.chains[bAck.Position.ChainID].lastOutputPosition; out != nil {
+						ok = !out.Older(&bAck.Position)
+					} else if ackTip :=
+						data.chains[bAck.Position.ChainID].tip; ackTip != nil {
+						ok = !ackTip.Position.Older(&bAck.Position)
+					}
+				} else {
+					ok = idx < data.chains[bAck.Position.ChainID].nextOutputIndex
+				}
+				if ok {
+					continue
+				}
+				// This acked block exists and not delivered yet.
+				allAckingBlockDelivered = false
+			}
+			if allAckingBlockDelivered {
+				status.lastOutputPosition = &tip.Position
+				status.nextOutputIndex++
+				deliverable = append(deliverable, tip)
+				updated = true
+			}
+		}
+		if !updated {
+			break
+		}
+	}
+	return
+}
+
+// addFinalizedBlock processes block for syncing internal data.
+func (data *latticeData) addFinalizedBlock(
+	block *types.Block) (err error) {
+	var bAck *types.Block
+	chain := data.chains[block.Position.ChainID]
+	if chain.tip != nil && chain.tip.Position.Height >=
+		block.Position.Height {
+		return
+	}
+	chain.nextOutputIndex = 0
+	chain.blocks = []*types.Block{}
+	chain.tip = block
+	chain.lastOutputPosition = nil
+	// Update lastAckPost.
+	for _, ack := range block.Acks {
+		if bAck, err = data.findBlock(ack); err != nil {
+			return
+		}
+		data.chains[bAck.Position.ChainID].lastAckPos[block.Position.ChainID] =
+			bAck.Position.Clone()
+	}
+	return
+}
+
+// prepareBlock helps to setup fields of block based on its ChainID and Round,
+// including:
+//  - Acks
+//  - Timestamp
+//  - ParentHash and Height from parent block. If there is no valid parent block
+//    (ex. Newly added chain or bootstrap ), these fields would be setup as
+//    genesis block.
+func (data *latticeData) prepareBlock(b *types.Block) error {
+	var (
+		minTimestamp, maxTimestamp time.Time
+		config                     *latticeDataConfig
+		acks                       common.Hashes
+		bindTip                    bool
+		chainTip                   *types.Block
+	)
+	if config = data.getConfig(b.Position.Round); config == nil {
+		return ErrUnknownRoundID
+	}
+	// When this chain is illegal in this round, reject it.
+	if b.Position.ChainID >= config.numChains {
+		return ErrInvalidChainID
+	}
+	// Reset fields to make sure we got these information from parent block.
+	b.Position.Height = 0
+	b.ParentHash = common.Hash{}
+	// Decide valid timestamp range.
+	homeChain := data.chains[b.Position.ChainID]
+	if homeChain.tip != nil {
+		chainTip = homeChain.tip
+		if b.Position.Round < chainTip.Position.Round {
+			return ErrInvalidRoundID
+		}
+		chainTipConfig := data.getConfig(chainTip.Position.Round)
+		if chainTip.Timestamp.After(chainTipConfig.roundEndTime) {
+			if b.Position.Round == chainTip.Position.Round {
+				return ErrRoundNotSwitch
+			}
+			if b.Position.Round == chainTip.Position.Round+1 {
+				bindTip = true
+			}
+		} else {
+			if b.Position.Round != chainTip.Position.Round {
+				return ErrInvalidRoundID
+			}
+			bindTip = true
+		}
+		// TODO(mission): find a way to prevent us to assign a witness height
+		//                from Jurassic period.
+		b.Witness.Height = chainTip.Witness.Height
+	}
+	// For blocks with continuous round ID, assign timestamp range based on
+	// parent block and bound config.
+	if bindTip {
+		minTimestamp = chainTip.Timestamp.Add(config.minBlockTimeInterval)
+		maxTimestamp = chainTip.Timestamp.Add(config.maxBlockTimeInterval)
+		// When a chain is removed and added back, the reference block
+		// of previous round can't be used as parent block.
+		b.ParentHash = chainTip.Hash
+		b.Position.Height = chainTip.Position.Height + 1
+	} else {
+		// Discontinuous round ID detected, another fresh start of
+		// new round.
+		minTimestamp = config.roundBeginTime
+		maxTimestamp = config.roundBeginTime.Add(config.maxBlockTimeInterval)
+	}
+	// Fix timestamp if the given one is invalid.
+	if b.Timestamp.Before(minTimestamp) {
+		b.Timestamp = minTimestamp
+	} else if b.Timestamp.After(maxTimestamp) {
+		b.Timestamp = maxTimestamp
+	}
+	// Setup acks fields.
+	for _, status := range data.chains {
+		// Check if we can ack latest block on that chain.
+		if status.tip == nil {
+			continue
+		}
+		lastAckPos := status.lastAckPos[b.Position.ChainID]
+		if lastAckPos != nil && !status.tip.Position.Newer(lastAckPos) {
+			// The reference block is already acked.
+			continue
+		}
+		if status.tip.Position.Round > b.Position.Round {
+			// Avoid forward acking: acking some block from later rounds.
+			continue
+		}
+		if b.Position.Round > status.tip.Position.Round+1 {
+			// Can't ack block too old or too new to us.
+			continue
+		}
+		acks = append(acks, status.tip.Hash)
+	}
+	b.Acks = common.NewSortedHashes(acks)
+	return nil
+}
+
+// prepareEmptyBlock helps to setup fields of block based on its ChainID.
+// including:
+//  - Acks only acking its parent
+//  - Timestamp with parent.Timestamp + minBlockProposeInterval
+//  - ParentHash and Height from parent block. If there is no valid parent block
+//    (ex. Newly added chain or bootstrap ), these fields would be setup as
+//    genesis block.
+func (data *latticeData) prepareEmptyBlock(b *types.Block) {
+	// emptyBlock has no proposer.
+	b.ProposerID = types.NodeID{}
+	var acks common.Hashes
+	// Reset fields to make sure we got these information from parent block.
+	b.Position.Height = 0
+	b.Position.Round = 0
+	b.ParentHash = common.Hash{}
+	b.Timestamp = time.Time{}
+	// Decide valid timestamp range.
+	homeChain := data.chains[b.Position.ChainID]
+	if homeChain.tip != nil {
+		chainTip := homeChain.tip
+		b.ParentHash = chainTip.Hash
+		chainTipConfig := data.getConfig(chainTip.Position.Round)
+		if chainTip.Timestamp.After(chainTipConfig.roundEndTime) {
+			b.Position.Round = chainTip.Position.Round + 1
+		} else {
+			b.Position.Round = chainTip.Position.Round
+		}
+		b.Position.Height = chainTip.Position.Height + 1
+		b.Timestamp = chainTip.Timestamp.Add(chainTipConfig.minBlockTimeInterval)
+		acks = append(acks, chainTip.Hash)
+	}
+	b.Acks = common.NewSortedHashes(acks)
+}
+
+// TODO(mission): make more abstraction for this method.
+// nextHeight returns the next height for the chain.
+func (data *latticeData) nextPosition(chainID uint32) types.Position {
+	return data.chains[chainID].nextPosition()
+}
+
+// findBlock seeks blocks in memory or db.
+func (data *latticeData) findBlock(h common.Hash) (b *types.Block, err error) {
+	if b = data.blockByHash[h]; b != nil {
+		return
+	}
+	var tmpB types.Block
+	if tmpB, err = data.db.Get(h); err != nil {
+		return
+	}
+	b = &tmpB
+	return
+}
+
+// purgeBlocks purges blocks from cache.
+func (data *latticeData) purgeBlocks(blocks []*types.Block) error {
+	for _, b := range blocks {
+		if _, exists := data.blockByHash[b.Hash]; !exists {
+			return ErrPurgedBlockNotFound
+		}
+		delete(data.blockByHash, b.Hash)
+		// blocks would be purged in ascending order in position.
+		if err := data.chains[b.Position.ChainID].purgeBlock(b); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// getConfig get configuration for lattice-data by round ID.
+func (data *latticeData) getConfig(round uint64) (config *latticeDataConfig) {
+	if round >= uint64(len(data.configs)) {
+		return
+	}
+	return data.configs[round]
+}
+
+// appendConfig appends a configuration for upcoming round. When you append
+// a config for round R, next time you can only append the config for round R+1.
+func (data *latticeData) appendConfig(
+	round uint64, config *types.Config) (err error) {
+	// Make sure caller knows which round this config belongs to.
+	if round != uint64(len(data.configs)) {
+		return ErrRoundNotIncreasing
+	}
+	// Set round beginning time.
+	newConfig := newLatticeDataConfig(data.configs[len(data.configs)-1], config)
+	data.configs = append(data.configs, newConfig)
+	// Resize each slice if incoming config contains larger number of chains.
+	if uint32(len(data.chains)) < newConfig.numChains {
+		count := newConfig.numChains - uint32(len(data.chains))
+		for _, status := range data.chains {
+			status.lastAckPos = append(
+				status.lastAckPos, make([]*types.Position, count)...)
+		}
+		for i := uint32(len(data.chains)); i < newConfig.numChains; i++ {
+			data.chains = append(data.chains, &chainStatus{
+				ID:         i,
+				blocks:     []*types.Block{},
+				lastAckPos: make([]*types.Position, newConfig.numChains),
+			})
+		}
+	}
+	return nil
+}
+
+type chainStatus struct {
+	// ID keeps the chainID of this chain status.
+	ID uint32
+	// blocks stores blocks proposed for this chain, sorted by height.
+	blocks []*types.Block
+	// tip is the last block on this chain.
+	tip *types.Block
+	// lastAckPos caches last acking position from other chains. Nil means
+	// not acked yet.
+	lastAckPos []*types.Position
+	// the index to be output next time.
+	nextOutputIndex int
+	// the position of output last time.
+	lastOutputPosition *types.Position
+}
+
+// findBlock finds index of block in current pending blocks on this chain.
+// -1 means not found.
+func (s *chainStatus) findBlock(pos *types.Position) (idx int) {
+	idx = sort.Search(len(s.blocks), func(i int) bool {
+		return s.blocks[i].Position.Newer(pos) ||
+			s.blocks[i].Position.Equal(pos)
+	})
+	if idx == len(s.blocks) {
+		idx = -1
+	} else if !s.blocks[idx].Position.Equal(pos) {
+		idx = -1
+	}
+	return idx
+}
+
+// getBlock returns a pending block by giving its index from findBlock method.
+func (s *chainStatus) getBlock(idx int) (b *types.Block) {
+	if idx < 0 || idx >= len(s.blocks) {
+		return
+	}
+	b = s.blocks[idx]
+	return
+}
+
+// addBlock adds a block to pending blocks on this chain.
+func (s *chainStatus) addBlock(b *types.Block) {
+	s.blocks = append(s.blocks, b)
+	s.tip = b
+}
+
+// TODO(mission): change back to nextHeight.
+// nextPosition returns a valid position for new block in this chain.
+func (s *chainStatus) nextPosition() types.Position {
+	if s.tip == nil {
+		return types.Position{
+			ChainID: s.ID,
+			Height:  0,
+		}
+	}
+	return types.Position{
+		ChainID: s.ID,
+		Height:  s.tip.Position.Height + 1,
+	}
+}
+
+// purgeBlock purge a block from cache, make sure this block already
+// persists to blockdb.
+func (s *chainStatus) purgeBlock(b *types.Block) error {
+	if b.Hash != s.blocks[0].Hash || s.nextOutputIndex <= 0 {
+		return ErrPurgeNotDeliveredBlock
+	}
+	s.blocks = s.blocks[1:]
+	s.nextOutputIndex--
+	return nil
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/lattice.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/lattice.go
new file mode 100644
index 000000000..af9c3c42f
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/lattice.go
@@ -0,0 +1,317 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/blockdb"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+// Errors for sanity check error.
+var (
+	ErrRetrySanityCheckLater = fmt.Errorf("retry sanity check later")
+)
+
+// Lattice represents a unit to produce a global ordering from multiple chains.
+type Lattice struct {
+	lock       sync.RWMutex
+	authModule *Authenticator
+	app        Application
+	debug      Debug
+	pool       blockPool
+	retryAdd   bool
+	data       *latticeData
+	toModule   *totalOrdering
+	ctModule   *consensusTimestamp
+	logger     common.Logger
+}
+
+// NewLattice constructs an Lattice instance.
+func NewLattice(
+	dMoment time.Time,
+	cfg *types.Config,
+	authModule *Authenticator,
+	app Application,
+	debug Debug,
+	db blockdb.BlockDatabase,
+	logger common.Logger) (s *Lattice) {
+	// Create genesis latticeDataConfig.
+	dataConfig := newGenesisLatticeDataConfig(dMoment, cfg)
+	toConfig := newGenesisTotalOrderingConfig(dMoment, cfg)
+	s = &Lattice{
+		authModule: authModule,
+		app:        app,
+		debug:      debug,
+		pool:       newBlockPool(cfg.NumChains),
+		data:       newLatticeData(db, dataConfig),
+		toModule:   newTotalOrdering(toConfig),
+		ctModule:   newConsensusTimestamp(dMoment, 0, cfg.NumChains),
+		logger:     logger,
+	}
+	return
+}
+
+// PrepareBlock setup block's field based on current lattice status.
+func (s *Lattice) PrepareBlock(
+	b *types.Block, proposeTime time.Time) (err error) {
+
+	s.lock.RLock()
+	defer s.lock.RUnlock()
+
+	b.Timestamp = proposeTime
+	if err = s.data.prepareBlock(b); err != nil {
+		return
+	}
+	s.logger.Debug("Calling Application.PreparePayload", "position", b.Position)
+	if b.Payload, err = s.app.PreparePayload(b.Position); err != nil {
+		return
+	}
+	s.logger.Debug("Calling Application.PrepareWitness",
+		"height", b.Witness.Height)
+	if b.Witness, err = s.app.PrepareWitness(b.Witness.Height); err != nil {
+		return
+	}
+	if err = s.authModule.SignBlock(b); err != nil {
+		return
+	}
+	return
+}
+
+// PrepareEmptyBlock setup block's field based on current lattice status.
+func (s *Lattice) PrepareEmptyBlock(b *types.Block) (err error) {
+	s.lock.RLock()
+	defer s.lock.RUnlock()
+	s.data.prepareEmptyBlock(b)
+	if b.Hash, err = hashBlock(b); err != nil {
+		return
+	}
+	return
+}
+
+// SanityCheck check if a block is valid.
+//
+// If some acking blocks don't exists, Lattice would help to cache this block
+// and retry when lattice updated in Lattice.ProcessBlock.
+func (s *Lattice) SanityCheck(b *types.Block) (err error) {
+	if b.IsEmpty() {
+		// Only need to verify block's hash.
+		var hash common.Hash
+		if hash, err = hashBlock(b); err != nil {
+			return
+		}
+		if b.Hash != hash {
+			return ErrInvalidBlock
+		}
+	} else {
+		// Verify block's signature.
+		if err = s.authModule.VerifyBlock(b); err != nil {
+			return
+		}
+	}
+	// Make sure acks are sorted.
+	for i := range b.Acks {
+		if i == 0 {
+			continue
+		}
+		if !b.Acks[i-1].Less(b.Acks[i]) {
+			err = ErrAcksNotSorted
+			return
+		}
+	}
+	if err = func() (err error) {
+		s.lock.RLock()
+		defer s.lock.RUnlock()
+		if err = s.data.sanityCheck(b); err != nil {
+			if _, ok := err.(*ErrAckingBlockNotExists); ok {
+				err = ErrRetrySanityCheckLater
+			}
+			s.logger.Error("Sanity Check failed", "error", err)
+			return
+		}
+		return
+	}(); err != nil {
+		return
+	}
+	// Verify data in application layer.
+	s.logger.Debug("Calling Application.VerifyBlock", "block", b)
+	switch s.app.VerifyBlock(b) {
+	case types.VerifyInvalidBlock:
+		err = ErrInvalidBlock
+	case types.VerifyRetryLater:
+		err = ErrRetrySanityCheckLater
+	}
+	return
+}
+
+// addBlockToLattice adds a block into lattice, and deliver blocks with the acks
+// already delivered.
+//
+// NOTE: assume the block passed sanity check.
+func (s *Lattice) addBlockToLattice(
+	input *types.Block) (outputBlocks []*types.Block, err error) {
+	if tip := s.data.chains[input.Position.ChainID].tip; tip != nil {
+		if !input.Position.Newer(&tip.Position) {
+			return
+		}
+	}
+	s.pool.addBlock(input)
+	// Replay tips in pool to check their validity.
+	for {
+		hasOutput := false
+		for i := uint32(0); i < uint32(len(s.pool)); i++ {
+			var tip *types.Block
+			if tip = s.pool.tip(i); tip == nil {
+				continue
+			}
+			err = s.data.sanityCheck(tip)
+			if err == nil {
+				var output []*types.Block
+				if output, err = s.data.addBlock(tip); err != nil {
+					s.logger.Error("Sanity Check failed", "error", err)
+					continue
+				}
+				hasOutput = true
+				outputBlocks = append(outputBlocks, output...)
+			}
+			if _, ok := err.(*ErrAckingBlockNotExists); ok {
+				err = nil
+				continue
+			}
+			s.pool.removeTip(i)
+		}
+		if !hasOutput {
+			break
+		}
+	}
+
+	for _, b := range outputBlocks {
+		// TODO(jimmy-dexon): change this name of classic DEXON algorithm.
+		if s.debug != nil {
+			s.debug.StronglyAcked(b.Hash)
+		}
+		s.logger.Debug("Calling Application.BlockConfirmed", "block", input)
+		s.app.BlockConfirmed(*b.Clone())
+		// Purge blocks in pool with the same chainID and lower height.
+		s.pool.purgeBlocks(b.Position.ChainID, b.Position.Height)
+	}
+
+	return
+}
+
+// ProcessBlock adds a block into lattice, and deliver ordered blocks.
+// If any block pass sanity check after this block add into lattice, they
+// would be returned, too.
+//
+// NOTE: assume the block passed sanity check.
+func (s *Lattice) ProcessBlock(
+	input *types.Block) (delivered []*types.Block, err error) {
+	var (
+		b             *types.Block
+		inLattice     []*types.Block
+		toDelivered   []*types.Block
+		deliveredMode uint32
+	)
+
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if inLattice, err = s.addBlockToLattice(input); err != nil {
+		return
+	}
+
+	if len(inLattice) == 0 {
+		return
+	}
+
+	// Perform total ordering for each block added to lattice.
+	for _, b = range inLattice {
+		toDelivered, deliveredMode, err = s.toModule.processBlock(b)
+		if err != nil {
+			// All errors from total ordering is serious, should panic.
+			panic(err)
+		}
+		if len(toDelivered) == 0 {
+			continue
+		}
+		hashes := make(common.Hashes, len(toDelivered))
+		for idx := range toDelivered {
+			hashes[idx] = toDelivered[idx].Hash
+		}
+		if s.debug != nil {
+			s.debug.TotalOrderingDelivered(hashes, deliveredMode)
+		}
+		// Perform timestamp generation.
+		if err = s.ctModule.processBlocks(toDelivered); err != nil {
+			return
+		}
+		delivered = append(delivered, toDelivered...)
+	}
+	return
+}
+
+// NextPosition returns expected position of incoming block for that chain.
+func (s *Lattice) NextPosition(chainID uint32) types.Position {
+	s.lock.RLock()
+	defer s.lock.RUnlock()
+
+	return s.data.nextPosition(chainID)
+}
+
+// PurgeBlocks from cache of blocks in memory, this is called when the caller
+// make sure those blocks are saved to db.
+func (s *Lattice) PurgeBlocks(blocks []*types.Block) error {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	return s.data.purgeBlocks(blocks)
+}
+
+// AppendConfig add new configs for upcoming rounds. If you add a config for
+// round R, next time you can only add the config for round R+1.
+func (s *Lattice) AppendConfig(round uint64, config *types.Config) (err error) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	s.pool.resize(config.NumChains)
+	if err = s.data.appendConfig(round, config); err != nil {
+		return
+	}
+	if err = s.toModule.appendConfig(round, config); err != nil {
+		return
+	}
+	if err = s.ctModule.appendConfig(round, config); err != nil {
+		return
+	}
+	return
+}
+
+// ProcessFinalizedBlock is used for syncing lattice data.
+func (s *Lattice) ProcessFinalizedBlock(input *types.Block) {
+	defer func() { s.retryAdd = true }()
+	s.lock.Lock()
+	defer s.lock.Unlock()
+	if err := s.data.addFinalizedBlock(input); err != nil {
+		panic(err)
+	}
+	s.pool.purgeBlocks(input.Position.ChainID, input.Position.Height)
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/leader-selector.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/leader-selector.go
new file mode 100644
index 000000000..2be596abc
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/leader-selector.go
@@ -0,0 +1,136 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"fmt"
+	"math/big"
+	"sync"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+// Errors for leader module.
+var (
+	ErrIncorrectCRSSignature = fmt.Errorf("incorrect CRS signature")
+)
+
+type validLeaderFn func(*types.Block) bool
+
+// Some constant value.
+var (
+	maxHash *big.Int
+	one     *big.Rat
+)
+
+func init() {
+	hash := make([]byte, common.HashLength)
+	for i := range hash {
+		hash[i] = 0xff
+	}
+	maxHash = big.NewInt(0).SetBytes(hash)
+	one = big.NewRat(1, 1)
+}
+
+type leaderSelector struct {
+	hashCRS       common.Hash
+	numCRS        *big.Int
+	minCRSBlock   *big.Int
+	minBlockHash  common.Hash
+	pendingBlocks []*types.Block
+	validLeader   validLeaderFn
+	lock          sync.Mutex
+}
+
+func newLeaderSelector(
+	crs common.Hash, validLeader validLeaderFn) *leaderSelector {
+	numCRS := big.NewInt(0)
+	numCRS.SetBytes(crs[:])
+	return &leaderSelector{
+		numCRS:      numCRS,
+		hashCRS:     crs,
+		minCRSBlock: maxHash,
+		validLeader: validLeader,
+	}
+}
+
+func (l *leaderSelector) distance(sig crypto.Signature) *big.Int {
+	hash := crypto.Keccak256Hash(sig.Signature[:])
+	num := big.NewInt(0)
+	num.SetBytes(hash[:])
+	num.Abs(num.Sub(l.numCRS, num))
+	return num
+}
+
+func (l *leaderSelector) probability(sig crypto.Signature) float64 {
+	dis := l.distance(sig)
+	prob := big.NewRat(1, 1).SetFrac(dis, maxHash)
+	p, _ := prob.Sub(one, prob).Float64()
+	return p
+}
+
+func (l *leaderSelector) restart() {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+	l.minCRSBlock = maxHash
+	l.minBlockHash = common.Hash{}
+	l.pendingBlocks = []*types.Block{}
+}
+
+func (l *leaderSelector) leaderBlockHash() common.Hash {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+	newPendingBlocks := []*types.Block{}
+	for _, b := range l.pendingBlocks {
+		if l.validLeader(b) {
+			l.updateLeader(b)
+		} else {
+			newPendingBlocks = append(newPendingBlocks, b)
+		}
+	}
+	l.pendingBlocks = newPendingBlocks
+	return l.minBlockHash
+}
+
+func (l *leaderSelector) processBlock(block *types.Block) error {
+	ok, err := verifyCRSSignature(block, l.hashCRS)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return ErrIncorrectCRSSignature
+	}
+	l.lock.Lock()
+	defer l.lock.Unlock()
+	if !l.validLeader(block) {
+		l.pendingBlocks = append(l.pendingBlocks, block)
+		return nil
+	}
+	l.updateLeader(block)
+	return nil
+}
+func (l *leaderSelector) updateLeader(block *types.Block) {
+	dist := l.distance(block.CRSSignature)
+	cmp := l.minCRSBlock.Cmp(dist)
+	if cmp > 0 || (cmp == 0 && block.Hash.Less(l.minBlockHash)) {
+		l.minCRSBlock = dist
+		l.minBlockHash = block.Hash
+	}
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/negative-ack.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/negative-ack.go
new file mode 100644
index 000000000..417862912
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/negative-ack.go
@@ -0,0 +1,211 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+type negativeAck struct {
+	// owner is the ID of proposer itself, this is used when deciding
+	// a node to be restricted or not.
+	owner types.NodeID
+
+	numOfNodes int
+
+	// timeDelay and timeExpire are for nack timeout.
+	timeDelay  time.Duration
+	timeExpire time.Duration
+
+	// restricteds stores nodes which has been restricted and the time it's
+	// restricted.
+	restricteds map[types.NodeID]time.Time
+
+	// lastVotes and lockedVotes store the votes for nack. lastVotes[nid1][nid2]
+	// and lockedVotes[nid1][nid2] both mean that nid2 votes nid1. The difference
+	// is lockedVotes works only when nid1 is restricted, so that the votes are
+	// needed to be locked.
+	lastVotes   map[types.NodeID]map[types.NodeID]struct{}
+	lockedVotes map[types.NodeID]map[types.NodeID]struct{}
+
+	// timeDiffs is the cache for last time stamps. timeDiffs[nid1][nid2] means
+	// the last updated timestamps nid1 sees nid2.
+	timeDiffs map[types.NodeID]map[types.NodeID]map[types.NodeID]time.Time
+}
+
+// newNegativeAck creates a new negaticeAck instance.
+func newNegativeAck(nid types.NodeID) *negativeAck {
+	n := &negativeAck{
+		owner:       nid,
+		numOfNodes:  0,
+		restricteds: make(map[types.NodeID]time.Time),
+		lastVotes:   make(map[types.NodeID]map[types.NodeID]struct{}),
+		lockedVotes: make(map[types.NodeID]map[types.NodeID]struct{}),
+		timeDiffs:   make(map[types.NodeID]map[types.NodeID]map[types.NodeID]time.Time),
+	}
+	n.addNode(nid)
+	return n
+}
+
+// processNewVote is called when a new "vote" occurs, that is, a node
+// sees that other 2f + 1 nodes think a node is slow. "nid" is the
+// node which propesed the block which the timestamps votes and "h" is
+// the node been voted to be nacked.
+func (n *negativeAck) processNewVote(
+	nid types.NodeID,
+	h types.NodeID,
+) []types.NodeID {
+
+	nackeds := []types.NodeID{}
+	if _, exist := n.restricteds[h]; exist {
+		n.lockedVotes[h][nid] = struct{}{}
+		if len(n.lockedVotes[h]) > 2*(n.numOfNodes-1)/3 {
+			nackeds = append(nackeds, h)
+			delete(n.restricteds, h)
+		}
+	} else {
+		if n.owner == nid {
+			n.restrict(h)
+		} else {
+			n.lastVotes[h][nid] = struct{}{}
+			if len(n.lastVotes[h]) > (n.numOfNodes-1)/3 {
+				n.restrict(h)
+			}
+		}
+	}
+	return nackeds
+}
+
+// processTimestamps process new timestamps of a block which is proposed by
+// node nid, and returns the nodes being nacked.
+func (n *negativeAck) processTimestamps(
+	nid types.NodeID,
+	ts map[types.NodeID]time.Time,
+) []types.NodeID {
+
+	n.checkRestrictExpire()
+
+	nackeds := []types.NodeID{}
+	for h := range n.timeDiffs {
+		if n.timeDiffs[nid][h][h].Equal(ts[h]) {
+			votes := 0
+			for hh := range n.timeDiffs {
+				if ts[hh].Sub(n.timeDiffs[nid][h][hh]) >= n.timeDelay {
+					votes++
+				}
+			}
+			if votes > 2*((n.numOfNodes-1)/3) {
+				n.lastVotes[h][nid] = struct{}{}
+				nack := n.processNewVote(nid, h)
+				for _, i := range nack {
+					nackeds = append(nackeds, i)
+				}
+			} else {
+				delete(n.lastVotes[h], nid)
+			}
+		} else {
+			for hh := range n.timeDiffs {
+				n.timeDiffs[nid][h][hh] = ts[hh]
+			}
+			delete(n.lastVotes[h], nid)
+		}
+	}
+	return nackeds
+}
+
+func (n *negativeAck) checkRestrictExpire() {
+	expired := []types.NodeID{}
+	now := time.Now()
+	for h, t := range n.restricteds {
+		if now.Sub(t) >= n.timeExpire {
+			expired = append(expired, h)
+		}
+	}
+	for _, h := range expired {
+		delete(n.restricteds, h)
+	}
+}
+
+func (n *negativeAck) restrict(nid types.NodeID) {
+	if _, exist := n.restricteds[nid]; !exist {
+		n.restricteds[nid] = time.Now().UTC()
+		n.lockedVotes[nid] = map[types.NodeID]struct{}{}
+		for h := range n.lastVotes[nid] {
+			n.lockedVotes[nid][h] = struct{}{}
+		}
+	}
+}
+
+func (n *negativeAck) getRestrictedNodes() map[types.NodeID]struct{} {
+	n.checkRestrictExpire()
+	ret := map[types.NodeID]struct{}{}
+	for h := range n.restricteds {
+		ret[h] = struct{}{}
+	}
+	return ret
+}
+
+func (n *negativeAck) setTimeDelay(t time.Duration) {
+	n.timeDelay = t
+}
+
+func (n *negativeAck) setTimeExpire(t time.Duration) {
+	n.timeExpire = t
+}
+
+func (n *negativeAck) addNode(nid types.NodeID) {
+	n.numOfNodes++
+	n.lastVotes[nid] = make(map[types.NodeID]struct{})
+	n.lockedVotes[nid] = make(map[types.NodeID]struct{})
+
+	newTimeDiff := make(map[types.NodeID]map[types.NodeID]time.Time)
+	for h := range n.timeDiffs {
+		newTimeDiff2 := make(map[types.NodeID]time.Time)
+		for hh := range n.timeDiffs {
+			newTimeDiff2[hh] = time.Time{}
+		}
+		newTimeDiff[h] = newTimeDiff2
+	}
+	n.timeDiffs[nid] = newTimeDiff
+	for h := range n.timeDiffs {
+		n.timeDiffs[h][nid] = make(map[types.NodeID]time.Time)
+	}
+}
+
+func (n *negativeAck) deleteNode(nid types.NodeID) {
+	n.numOfNodes--
+
+	delete(n.timeDiffs, nid)
+
+	for h := range n.lastVotes {
+		delete(n.lastVotes[h], nid)
+	}
+	delete(n.lastVotes, nid)
+	delete(n.lockedVotes, nid)
+
+	for h := range n.timeDiffs {
+		delete(n.timeDiffs[h], nid)
+		for hh := range n.timeDiffs[h] {
+			delete(n.timeDiffs[h][hh], nid)
+		}
+	}
+
+	delete(n.restricteds, nid)
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/nodeset-cache.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/nodeset-cache.go
new file mode 100644
index 000000000..bf7b88d89
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/nodeset-cache.go
@@ -0,0 +1,233 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"errors"
+	"sync"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+var (
+	// ErrRoundNotReady means we got nil config.
+	ErrRoundNotReady = errors.New("round is not ready")
+)
+
+type sets struct {
+	nodeSet   *types.NodeSet
+	notarySet []map[types.NodeID]struct{}
+	dkgSet    map[types.NodeID]struct{}
+}
+
+// NodeSetCacheInterface interface specifies interface used by NodeSetCache.
+type NodeSetCacheInterface interface {
+	// Configuration returns the configuration at a given round.
+	// Return the genesis configuration if round == 0.
+	Configuration(round uint64) *types.Config
+
+	// CRS returns the CRS for a given round.
+	// Return the genesis CRS if round == 0.
+	CRS(round uint64) common.Hash
+
+	// NodeSet returns the node set at a given round.
+	// Return the genesis node set if round == 0.
+	NodeSet(round uint64) []crypto.PublicKey
+}
+
+// NodeSetCache caches node set information.
+type NodeSetCache struct {
+	lock    sync.RWMutex
+	nsIntf  NodeSetCacheInterface
+	rounds  map[uint64]*sets
+	keyPool map[types.NodeID]*struct {
+		pubKey crypto.PublicKey
+		refCnt int
+	}
+}
+
+// NewNodeSetCache constructs an NodeSetCache instance.
+func NewNodeSetCache(nsIntf NodeSetCacheInterface) *NodeSetCache {
+	return &NodeSetCache{
+		nsIntf: nsIntf,
+		rounds: make(map[uint64]*sets),
+		keyPool: make(map[types.NodeID]*struct {
+			pubKey crypto.PublicKey
+			refCnt int
+		}),
+	}
+}
+
+// Exists checks if a node is in node set of that round.
+func (cache *NodeSetCache) Exists(
+	round uint64, nodeID types.NodeID) (exists bool, err error) {
+
+	nIDs, exists := cache.get(round)
+	if !exists {
+		if nIDs, err = cache.update(round); err != nil {
+			return
+		}
+	}
+	_, exists = nIDs.nodeSet.IDs[nodeID]
+	return
+}
+
+// GetPublicKey return public key for that node:
+func (cache *NodeSetCache) GetPublicKey(
+	nodeID types.NodeID) (key crypto.PublicKey, exists bool) {
+
+	cache.lock.RLock()
+	defer cache.lock.RUnlock()
+
+	rec, exists := cache.keyPool[nodeID]
+	if exists {
+		key = rec.pubKey
+	}
+	return
+}
+
+// GetNodeSet returns IDs of nodes set of this round as map.
+func (cache *NodeSetCache) GetNodeSet(
+	round uint64) (nIDs *types.NodeSet, err error) {
+
+	IDs, exists := cache.get(round)
+	if !exists {
+		if IDs, err = cache.update(round); err != nil {
+			return
+		}
+	}
+	nIDs = IDs.nodeSet.Clone()
+	return
+}
+
+// GetNotarySet returns of notary set of this round.
+func (cache *NodeSetCache) GetNotarySet(
+	round uint64, chainID uint32) (map[types.NodeID]struct{}, error) {
+	IDs, err := cache.getOrUpdate(round)
+	if err != nil {
+		return nil, err
+	}
+	if chainID >= uint32(len(IDs.notarySet)) {
+		return nil, ErrInvalidChainID
+	}
+	return cache.cloneMap(IDs.notarySet[chainID]), nil
+}
+
+// GetDKGSet returns of DKG set of this round.
+func (cache *NodeSetCache) GetDKGSet(
+	round uint64) (map[types.NodeID]struct{}, error) {
+	IDs, err := cache.getOrUpdate(round)
+	if err != nil {
+		return nil, err
+	}
+	return cache.cloneMap(IDs.dkgSet), nil
+}
+
+func (cache *NodeSetCache) cloneMap(
+	nIDs map[types.NodeID]struct{}) map[types.NodeID]struct{} {
+	nIDsCopy := make(map[types.NodeID]struct{}, len(nIDs))
+	for k := range nIDs {
+		nIDsCopy[k] = struct{}{}
+	}
+	return nIDsCopy
+}
+
+func (cache *NodeSetCache) getOrUpdate(round uint64) (nIDs *sets, err error) {
+	s, exists := cache.get(round)
+	if !exists {
+		if s, err = cache.update(round); err != nil {
+			return
+		}
+	}
+	nIDs = s
+	return
+}
+
+// update node set for that round.
+//
+// This cache would maintain 10 rounds before the updated round and purge
+// rounds not in this range.
+func (cache *NodeSetCache) update(
+	round uint64) (nIDs *sets, err error) {
+
+	cache.lock.Lock()
+	defer cache.lock.Unlock()
+
+	// Get the requested round.
+	keySet := cache.nsIntf.NodeSet(round)
+	if keySet == nil {
+		// That round is not ready yet.
+		err = ErrRoundNotReady
+		return
+	}
+	// Cache new round.
+	nodeSet := types.NewNodeSet()
+	for _, key := range keySet {
+		nID := types.NewNodeID(key)
+		nodeSet.Add(nID)
+		if rec, exists := cache.keyPool[nID]; exists {
+			rec.refCnt++
+		} else {
+			cache.keyPool[nID] = &struct {
+				pubKey crypto.PublicKey
+				refCnt int
+			}{key, 1}
+		}
+	}
+	cfg := cache.nsIntf.Configuration(round)
+	crs := cache.nsIntf.CRS(round)
+	nIDs = &sets{
+		nodeSet:   nodeSet,
+		notarySet: make([]map[types.NodeID]struct{}, cfg.NumChains),
+		dkgSet: nodeSet.GetSubSet(
+			int(cfg.DKGSetSize), types.NewDKGSetTarget(crs)),
+	}
+	for i := range nIDs.notarySet {
+		nIDs.notarySet[i] = nodeSet.GetSubSet(
+			int(cfg.NotarySetSize), types.NewNotarySetTarget(crs, uint32(i)))
+	}
+
+	cache.rounds[round] = nIDs
+	// Purge older rounds.
+	for rID, nIDs := range cache.rounds {
+		nodeSet := nIDs.nodeSet
+		if round-rID <= 5 {
+			continue
+		}
+		for nID := range nodeSet.IDs {
+			rec := cache.keyPool[nID]
+			if rec.refCnt--; rec.refCnt == 0 {
+				delete(cache.keyPool, nID)
+			}
+		}
+		delete(cache.rounds, rID)
+	}
+	return
+}
+
+func (cache *NodeSetCache) get(
+	round uint64) (nIDs *sets, exists bool) {
+
+	cache.lock.RLock()
+	defer cache.lock.RUnlock()
+
+	nIDs, exists = cache.rounds[round]
+	return
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/nonblocking.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/nonblocking.go
new file mode 100644
index 000000000..fafbd10bb
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/nonblocking.go
@@ -0,0 +1,164 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+type blockConfirmedEvent struct {
+	block *types.Block
+}
+
+type stronglyAckedEvent struct {
+	blockHash common.Hash
+}
+
+type totalOrderingDeliveredEvent struct {
+	blockHashes common.Hashes
+	mode        uint32
+}
+
+type blockDeliveredEvent struct {
+	blockHash common.Hash
+	result    *types.FinalizationResult
+}
+
+// nonBlocking implements these interfaces and is a decorator for
+// them that makes the methods to be non-blocking.
+//  - Application
+//  - Debug
+//  - It also provides nonblockig for blockdb update.
+type nonBlocking struct {
+	app          Application
+	debug        Debug
+	eventChan    chan interface{}
+	events       []interface{}
+	eventsChange *sync.Cond
+	running      sync.WaitGroup
+}
+
+func newNonBlocking(app Application, debug Debug) *nonBlocking {
+	nonBlockingModule := &nonBlocking{
+		app:          app,
+		debug:        debug,
+		eventChan:    make(chan interface{}, 6),
+		events:       make([]interface{}, 0, 100),
+		eventsChange: sync.NewCond(&sync.Mutex{}),
+	}
+	go nonBlockingModule.run()
+	return nonBlockingModule
+}
+
+func (nb *nonBlocking) addEvent(event interface{}) {
+	nb.eventsChange.L.Lock()
+	defer nb.eventsChange.L.Unlock()
+	nb.events = append(nb.events, event)
+	nb.eventsChange.Broadcast()
+}
+
+func (nb *nonBlocking) run() {
+	// This go routine consume the first event from events and call the
+	// corresponding methods of Application/Debug/blockdb.
+	for {
+		var event interface{}
+		func() {
+			nb.eventsChange.L.Lock()
+			defer nb.eventsChange.L.Unlock()
+			for len(nb.events) == 0 {
+				nb.eventsChange.Wait()
+			}
+			event = nb.events[0]
+			nb.events = nb.events[1:]
+			nb.running.Add(1)
+		}()
+		switch e := event.(type) {
+		case stronglyAckedEvent:
+			nb.debug.StronglyAcked(e.blockHash)
+		case blockConfirmedEvent:
+			nb.app.BlockConfirmed(*e.block)
+		case totalOrderingDeliveredEvent:
+			nb.debug.TotalOrderingDelivered(e.blockHashes, e.mode)
+		case blockDeliveredEvent:
+			nb.app.BlockDelivered(e.blockHash, *e.result)
+		default:
+			fmt.Printf("Unknown event %v.", e)
+		}
+		nb.running.Done()
+		nb.eventsChange.Broadcast()
+	}
+}
+
+// wait will wait for all event in events finishes.
+func (nb *nonBlocking) wait() {
+	nb.eventsChange.L.Lock()
+	defer nb.eventsChange.L.Unlock()
+	for len(nb.events) > 0 {
+		nb.eventsChange.Wait()
+	}
+	nb.running.Wait()
+}
+
+// PreparePayload cannot be non-blocking.
+func (nb *nonBlocking) PreparePayload(position types.Position) ([]byte, error) {
+	return nb.app.PreparePayload(position)
+}
+
+// PrepareWitness cannot be non-blocking.
+func (nb *nonBlocking) PrepareWitness(height uint64) (types.Witness, error) {
+	return nb.app.PrepareWitness(height)
+}
+
+// VerifyBlock cannot be non-blocking.
+func (nb *nonBlocking) VerifyBlock(block *types.Block) types.BlockVerifyStatus {
+	return nb.app.VerifyBlock(block)
+}
+
+// BlockConfirmed is called when a block is confirmed and added to lattice.
+func (nb *nonBlocking) BlockConfirmed(block types.Block) {
+	nb.addEvent(blockConfirmedEvent{&block})
+}
+
+// StronglyAcked is called when a block is strongly acked.
+func (nb *nonBlocking) StronglyAcked(blockHash common.Hash) {
+	if nb.debug != nil {
+		nb.addEvent(stronglyAckedEvent{blockHash})
+	}
+}
+
+// TotalOrderingDelivered is called when the total ordering algorithm deliver
+// a set of block.
+func (nb *nonBlocking) TotalOrderingDelivered(
+	blockHashes common.Hashes, mode uint32) {
+	if nb.debug != nil {
+		nb.addEvent(totalOrderingDeliveredEvent{blockHashes, mode})
+	}
+}
+
+// BlockDelivered is called when a block is add to the compaction chain.
+func (nb *nonBlocking) BlockDelivered(
+	blockHash common.Hash, result types.FinalizationResult) {
+	nb.addEvent(blockDeliveredEvent{
+		blockHash: blockHash,
+		result:    &result,
+	})
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/round-based-config.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/round-based-config.go
new file mode 100644
index 000000000..580b65e1c
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/round-based-config.go
@@ -0,0 +1,50 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+type roundBasedConfig struct {
+	roundID uint64
+	// roundBeginTime is the beginning of round, as local time.
+	roundBeginTime time.Time
+	roundInterval  time.Duration
+	// roundEndTime is a cache for begin + interval.
+	roundEndTime time.Time
+}
+
+func (config *roundBasedConfig) setupRoundBasedFields(
+	roundID uint64, cfg *types.Config) {
+	config.roundID = roundID
+	config.roundInterval = cfg.RoundInterval
+}
+
+func (config *roundBasedConfig) setRoundBeginTime(begin time.Time) {
+	config.roundBeginTime = begin
+	config.roundEndTime = begin.Add(config.roundInterval)
+}
+
+// isValidLastBlock checks if a block is a valid last block of this round.
+func (config *roundBasedConfig) isValidLastBlock(b *types.Block) bool {
+	return b.Position.Round == config.roundID &&
+		b.Timestamp.After(config.roundEndTime)
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/ticker.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/ticker.go
new file mode 100644
index 000000000..3728a79e6
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/ticker.go
@@ -0,0 +1,77 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import "time"
+
+// TickerType is the type of ticker.
+type TickerType int
+
+// TickerType enum.
+const (
+	TickerBA TickerType = iota
+	TickerDKG
+	TickerCRS
+)
+
+// defaultTicker is a wrapper to implement ticker interface based on
+// time.Ticker.
+type defaultTicker struct {
+	ticker *time.Ticker
+}
+
+// newDefaultTicker constructs an defaultTicker instance by giving an interval.
+func newDefaultTicker(lambda time.Duration) *defaultTicker {
+	return &defaultTicker{ticker: time.NewTicker(lambda)}
+}
+
+// Tick implements Tick method of ticker interface.
+func (t *defaultTicker) Tick() <-chan time.Time {
+	return t.ticker.C
+}
+
+// Stop implements Stop method of ticker interface.
+func (t *defaultTicker) Stop() {
+	t.ticker.Stop()
+}
+
+// newTicker is a helper to setup a ticker by giving an Governance. If
+// the governace object implements a ticker generator, a ticker from that
+// generator would be returned, else constructs a default one.
+func newTicker(gov Governance, round uint64, tickerType TickerType) (t Ticker) {
+	type tickerGenerator interface {
+		NewTicker(TickerType) Ticker
+	}
+
+	if gen, ok := gov.(tickerGenerator); ok {
+		t = gen.NewTicker(tickerType)
+	}
+	if t == nil {
+		var duration time.Duration
+		switch tickerType {
+		case TickerBA:
+			duration = gov.Configuration(round).LambdaBA
+		case TickerDKG:
+			duration = gov.Configuration(round).LambdaDKG
+		case TickerCRS:
+			duration = gov.Configuration(round).RoundInterval / 2
+		}
+		t = newDefaultTicker(duration)
+	}
+	return
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/total-ordering-syncer.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/total-ordering-syncer.go
new file mode 100644
index 000000000..aa90a1ded
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/total-ordering-syncer.go
@@ -0,0 +1,174 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"sort"
+	"sync"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+type totalOrderingSyncer struct {
+	lock sync.RWMutex
+
+	numChains          uint32
+	syncHeight         map[uint32]uint64
+	syncDeliverySetIdx int
+	pendingBlocks      []*types.Block
+	inPendingBlocks    map[common.Hash]struct{}
+
+	bootstrapChain map[uint32]struct{}
+
+	// Data to restore delivery set.
+	pendingDeliveryBlocks []*types.Block
+	deliverySet           map[int][]*types.Block
+	mapToDeliverySet      map[common.Hash]int
+}
+
+func newTotalOrderingSyncer(numChains uint32) *totalOrderingSyncer {
+	return &totalOrderingSyncer{
+		numChains:          numChains,
+		syncHeight:         make(map[uint32]uint64),
+		syncDeliverySetIdx: -1,
+		inPendingBlocks:    make(map[common.Hash]struct{}),
+		bootstrapChain:     make(map[uint32]struct{}),
+		deliverySet:        make(map[int][]*types.Block),
+		mapToDeliverySet:   make(map[common.Hash]int),
+	}
+}
+
+func (tos *totalOrderingSyncer) synced() bool {
+	tos.lock.RLock()
+	defer tos.lock.RUnlock()
+	return tos.syncDeliverySetIdx != -1
+}
+
+func (tos *totalOrderingSyncer) processBlock(
+	block *types.Block) (delivered []*types.Block) {
+	if tos.synced() {
+		if tos.syncHeight[block.Position.ChainID] >= block.Position.Height {
+			return
+		}
+		delivered = append(delivered, block)
+		return
+	}
+	tos.lock.Lock()
+	defer tos.lock.Unlock()
+	tos.inPendingBlocks[block.Hash] = struct{}{}
+	tos.pendingBlocks = append(tos.pendingBlocks, block)
+	if block.Position.Height == 0 {
+		tos.bootstrapChain[block.Position.ChainID] = struct{}{}
+	}
+	if uint32(len(tos.bootstrapChain)) == tos.numChains {
+		// Bootstrap mode.
+		delivered = tos.pendingBlocks
+		tos.syncDeliverySetIdx = 0
+		for i := uint32(0); i < tos.numChains; i++ {
+			tos.syncHeight[i] = uint64(0)
+		}
+	} else {
+		maxDeliverySetIdx := -1
+		// TODO(jimmy-dexon): below for loop can be optimized.
+	PendingBlockLoop:
+		for i, block := range tos.pendingBlocks {
+			idx, exist := tos.mapToDeliverySet[block.Hash]
+			if !exist {
+				continue
+			}
+			deliverySet := tos.deliverySet[idx]
+			// Check if all the blocks in deliverySet are in the pendingBlocks.
+			for _, dBlock := range deliverySet {
+				if _, exist := tos.inPendingBlocks[dBlock.Hash]; !exist {
+					continue PendingBlockLoop
+				}
+			}
+			if idx > maxDeliverySetIdx {
+				maxDeliverySetIdx = idx
+			}
+			// Check if all of the chains have delivered.
+			for _, dBlock := range deliverySet {
+				if h, exist := tos.syncHeight[dBlock.Position.ChainID]; exist {
+					if dBlock.Position.Height < h {
+						continue
+					}
+				}
+				tos.syncHeight[dBlock.Position.ChainID] = dBlock.Position.Height
+			}
+			if uint32(len(tos.syncHeight)) != tos.numChains {
+				continue
+			}
+			// Core is fully synced, it can start delivering blocks from idx.
+			tos.syncDeliverySetIdx = maxDeliverySetIdx
+			delivered = make([]*types.Block, 0, i)
+			break
+		}
+		if tos.syncDeliverySetIdx == -1 {
+			return
+		}
+		// Generating delivering blocks.
+		for i := maxDeliverySetIdx; i < len(tos.deliverySet); i++ {
+			deliverySet := tos.deliverySet[i]
+			sort.Sort(types.ByHash(deliverySet))
+			for _, block := range deliverySet {
+				if block.Position.Height > tos.syncHeight[block.Position.ChainID] {
+					tos.syncHeight[block.Position.ChainID] = block.Position.Height
+				}
+				delivered = append(delivered, block)
+			}
+		}
+		// Flush remaining blocks.
+		for _, block := range tos.pendingBlocks {
+			if _, exist := tos.mapToDeliverySet[block.Hash]; exist {
+				continue
+			}
+			if block.Position.Height > tos.syncHeight[block.Position.ChainID] {
+				tos.syncHeight[block.Position.ChainID] = block.Position.Height
+			}
+			delivered = append(delivered, block)
+		}
+	}
+	// Clean internal data model to save memory.
+	tos.pendingBlocks = nil
+	tos.inPendingBlocks = nil
+	tos.bootstrapChain = nil
+	tos.pendingDeliveryBlocks = nil
+	tos.deliverySet = nil
+	tos.mapToDeliverySet = nil
+	return
+}
+
+// The finalized block should be passed by the order of consensus height.
+func (tos *totalOrderingSyncer) processFinalizedBlock(block *types.Block) {
+	tos.lock.Lock()
+	defer tos.lock.Unlock()
+	if len(tos.pendingDeliveryBlocks) > 0 {
+		if block.Hash.Less(
+			tos.pendingDeliveryBlocks[len(tos.pendingDeliveryBlocks)-1].Hash) {
+			// pendingDeliveryBlocks forms a deliverySet.
+			idx := len(tos.deliverySet)
+			tos.deliverySet[idx] = tos.pendingDeliveryBlocks
+			for _, block := range tos.pendingDeliveryBlocks {
+				tos.mapToDeliverySet[block.Hash] = idx
+			}
+			tos.pendingDeliveryBlocks = []*types.Block{}
+		}
+	}
+	tos.pendingDeliveryBlocks = append(tos.pendingDeliveryBlocks, block)
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/total-ordering.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/total-ordering.go
new file mode 100644
index 000000000..a4778f593
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/total-ordering.go
@@ -0,0 +1,1355 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"errors"
+	"math"
+	"sort"
+	"sync"
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+const (
+	infinity uint64 = math.MaxUint64
+)
+
+const (
+	// TotalOrderingModeError returns mode error.
+	TotalOrderingModeError uint32 = iota
+	// TotalOrderingModeNormal returns mode normal.
+	TotalOrderingModeNormal
+	// TotalOrderingModeEarly returns mode early.
+	TotalOrderingModeEarly
+	// TotalOrderingModeFlush returns mode flush.
+	TotalOrderingModeFlush
+)
+
+var (
+	// ErrNotValidDAG would be reported when block subbmitted to totalOrdering
+	// didn't form a DAG.
+	ErrNotValidDAG = errors.New("not a valid dag")
+	// ErrFutureRoundDelivered means some blocks from later rounds are
+	// delivered, this means program error.
+	ErrFutureRoundDelivered = errors.New("future round delivered")
+	// ErrBlockFromPastRound means we receive some block from past round.
+	ErrBlockFromPastRound = errors.New("block from past round")
+	// ErrTotalOrderingHangs means total ordering hangs somewhere.
+	ErrTotalOrderingHangs = errors.New("total ordering hangs")
+	// ErrForwardAck means a block acking some blocks from newer round.
+	ErrForwardAck = errors.New("forward ack")
+	// ErrUnexpected means general (I'm lazy) errors.
+	ErrUnexpected = errors.New("unexpected")
+)
+
+// totalOrderingConfig is the configuration for total ordering.
+type totalOrderingConfig struct {
+	roundBasedConfig
+	// k represents the k in 'k-level total ordering'.
+	// In short, only block height equals to (global minimum height + k)
+	// would be taken into consideration.
+	k uint64
+	// phi is a const to control how strong the leading preceding block
+	// should be.
+	phi uint64
+	// chainNum is the count of chains.
+	numChains uint32
+	// Is round cutting required?
+	isFlushRequired bool
+}
+
+func (config *totalOrderingConfig) fromConfig(
+	roundID uint64, cfg *types.Config) {
+	config.k = uint64(cfg.K)
+	config.numChains = cfg.NumChains
+	config.phi = uint64(float32(cfg.NumChains-1)*cfg.PhiRatio + 1)
+	config.setupRoundBasedFields(roundID, cfg)
+}
+
+func newGenesisTotalOrderingConfig(
+	dMoment time.Time, config *types.Config) *totalOrderingConfig {
+	c := &totalOrderingConfig{}
+	c.fromConfig(0, config)
+	c.setRoundBeginTime(dMoment)
+	return c
+}
+
+func newTotalOrderingConfig(
+	prev *totalOrderingConfig, cur *types.Config) *totalOrderingConfig {
+	c := &totalOrderingConfig{}
+	c.fromConfig(prev.roundID+1, cur)
+	c.setRoundBeginTime(prev.roundEndTime)
+	prev.isFlushRequired = c.k != prev.k ||
+		c.phi != prev.phi ||
+		c.numChains != prev.numChains
+	return c
+}
+
+// totalOrderingWinRecord caches which chains this candidate
+// wins another one based on their height vector.
+type totalOrderingWinRecord struct {
+	wins  []int8
+	count uint
+}
+
+func (rec *totalOrderingWinRecord) reset() {
+	rec.count = 0
+	for idx := range rec.wins {
+		rec.wins[idx] = 0
+	}
+}
+
+func newTotalOrderingWinRecord(numChains uint32) (
+	rec *totalOrderingWinRecord) {
+	rec = &totalOrderingWinRecord{}
+	rec.reset()
+	rec.wins = make([]int8, numChains)
+	return
+}
+
+// grade implements the 'grade' potential function described in white paper.
+func (rec *totalOrderingWinRecord) grade(
+	numChains uint32, phi uint64, globalAnsLength uint64) int {
+	if uint64(rec.count) >= phi {
+		return 1
+	} else if uint64(rec.count) < phi-uint64(numChains)+globalAnsLength {
+		return 0
+	} else {
+		return -1
+	}
+}
+
+// totalOrderingHeightRecord records two things:
+//  - the minimum heiht of block from that chain acking this block.
+//  - the count of blocks from that chain acking this block.
+type totalOrderingHeightRecord struct{ minHeight, count uint64 }
+
+// totalOrderingObjectCache caches objects for reuse.
+// The target object is map because:
+//  - reuse map would prevent it grows during usage, when map grows,
+//    hashes of key would be recaculated, bucket reallocated, and values
+//    are copied.
+// However, to reuse a map, we have no easy way to erase its content but
+// iterating its keys and delete corresponding values.
+type totalOrderingObjectCache struct {
+	ackedStatus         [][]*totalOrderingHeightRecord
+	heightVectors       [][]uint64
+	winRecordContainers [][]*totalOrderingWinRecord
+	ackedVectors        []map[common.Hash]struct{}
+	winRecordPool       sync.Pool
+	numChains           uint32
+}
+
+// newTotalOrderingObjectCache constructs an totalOrderingObjectCache
+// instance.
+func newTotalOrderingObjectCache(numChains uint32) *totalOrderingObjectCache {
+	return &totalOrderingObjectCache{
+		winRecordPool: sync.Pool{
+			New: func() interface{} {
+				return newTotalOrderingWinRecord(numChains)
+			},
+		},
+		numChains: numChains,
+	}
+}
+
+// resize makes sure internal storage of totalOrdering instance can handle
+// maximum possible numChains in future configs.
+func (cache *totalOrderingObjectCache) resize(numChains uint32) {
+	// Basically, everything in cache needs to be cleaned.
+	if cache.numChains >= numChains {
+		return
+	}
+	cache.ackedStatus = nil
+	cache.heightVectors = nil
+	cache.winRecordContainers = nil
+	cache.ackedVectors = nil
+	cache.numChains = numChains
+	cache.winRecordPool = sync.Pool{
+		New: func() interface{} {
+			return newTotalOrderingWinRecord(numChains)
+		},
+	}
+}
+
+// requestAckedStatus requests a structure to record acking status of one
+// candidate (or a global view of acking status of pending set).
+func (cache *totalOrderingObjectCache) requestAckedStatus() (
+	acked []*totalOrderingHeightRecord) {
+	if len(cache.ackedStatus) == 0 {
+		acked = make([]*totalOrderingHeightRecord, cache.numChains)
+		for idx := range acked {
+			acked[idx] = &totalOrderingHeightRecord{count: 0}
+		}
+	} else {
+		acked, cache.ackedStatus =
+			cache.ackedStatus[len(cache.ackedStatus)-1],
+			cache.ackedStatus[:len(cache.ackedStatus)-1]
+		// Reset acked status.
+		for idx := range acked {
+			acked[idx].count = 0
+		}
+	}
+	return
+}
+
+// recycleAckedStatys recycles the structure to record acking status.
+func (cache *totalOrderingObjectCache) recycleAckedStatus(
+	acked []*totalOrderingHeightRecord) {
+	// If the recycled objects supports lower numChains than we required,
+	// don't recycle it.
+	if uint32(len(acked)) != cache.numChains {
+		return
+	}
+	cache.ackedStatus = append(cache.ackedStatus, acked)
+}
+
+// requestWinRecord requests an totalOrderingWinRecord instance.
+func (cache *totalOrderingObjectCache) requestWinRecord() (
+	win *totalOrderingWinRecord) {
+	win = cache.winRecordPool.Get().(*totalOrderingWinRecord)
+	win.reset()
+	return
+}
+
+// recycleWinRecord recycles an totalOrderingWinRecord instance.
+func (cache *totalOrderingObjectCache) recycleWinRecord(
+	win *totalOrderingWinRecord) {
+	if win == nil {
+		return
+	}
+	// If the recycled objects supports lower numChains than we required,
+	// don't recycle it.
+	if uint32(len(win.wins)) != cache.numChains {
+		return
+	}
+	cache.winRecordPool.Put(win)
+}
+
+// requestHeightVector requests a structure to record acking heights
+// of one candidate.
+func (cache *totalOrderingObjectCache) requestHeightVector() (hv []uint64) {
+	if len(cache.heightVectors) == 0 {
+		hv = make([]uint64, cache.numChains)
+	} else {
+		hv, cache.heightVectors =
+			cache.heightVectors[len(cache.heightVectors)-1],
+			cache.heightVectors[:len(cache.heightVectors)-1]
+	}
+	for idx := range hv {
+		hv[idx] = infinity
+	}
+	return
+}
+
+// recycleHeightVector recycles an instance to record acking heights
+// of one candidate.
+func (cache *totalOrderingObjectCache) recycleHeightVector(hv []uint64) {
+	// If the recycled objects supports lower numChains than we required,
+	// don't recycle it.
+	if uint32(len(hv)) != cache.numChains {
+		return
+	}
+	cache.heightVectors = append(cache.heightVectors, hv)
+}
+
+// requestWinRecordContainer requests a map of totalOrderingWinRecord.
+func (cache *totalOrderingObjectCache) requestWinRecordContainer() (
+	con []*totalOrderingWinRecord) {
+	if len(cache.winRecordContainers) == 0 {
+		con = make([]*totalOrderingWinRecord, cache.numChains)
+	} else {
+		con, cache.winRecordContainers =
+			cache.winRecordContainers[len(cache.winRecordContainers)-1],
+			cache.winRecordContainers[:len(cache.winRecordContainers)-1]
+		for idx := range con {
+			con[idx] = nil
+		}
+	}
+	return
+}
+
+// recycleWinRecordContainer recycles a map of totalOrderingWinRecord.
+func (cache *totalOrderingObjectCache) recycleWinRecordContainer(
+	con []*totalOrderingWinRecord) {
+	// If the recycled objects supports lower numChains than we required,
+	// don't recycle it.
+	if uint32(len(con)) != cache.numChains {
+		return
+	}
+	cache.winRecordContainers = append(cache.winRecordContainers, con)
+}
+
+// requestAckedVector requests an acked vector instance.
+func (cache *totalOrderingObjectCache) requestAckedVector() (
+	acked map[common.Hash]struct{}) {
+	if len(cache.ackedVectors) == 0 {
+		acked = make(map[common.Hash]struct{})
+	} else {
+		acked, cache.ackedVectors =
+			cache.ackedVectors[len(cache.ackedVectors)-1],
+			cache.ackedVectors[:len(cache.ackedVectors)-1]
+		for k := range acked {
+			delete(acked, k)
+		}
+	}
+	return
+}
+
+// recycleAckedVector recycles an acked vector instance.
+func (cache *totalOrderingObjectCache) recycleAckedVector(
+	acked map[common.Hash]struct{}) {
+	if acked == nil {
+		return
+	}
+	cache.ackedVectors = append(cache.ackedVectors, acked)
+}
+
+// totalOrderingCandidateInfo describes proceeding status for one candidate,
+// including:
+//  - acked status as height records, which could keep 'how many blocks from
+//    one chain acking this candidate.
+//  - cached height vector, which valid height based on K-level used for
+//    comparison in 'grade' function.
+//  - cached result of grade function to other candidates.
+//
+// Height Record:
+//  When block A acks block B, all blocks proposed from the same proposer
+//  as block A with higher height would also acks block B. Therefore,
+//  we just need to record:
+//   - the minimum height of acking block from that proposer
+//   - count of acking blocks from that proposer
+//  to repsent the acking status for block A.
+type totalOrderingCandidateInfo struct {
+	ackedStatus        []*totalOrderingHeightRecord
+	cachedHeightVector []uint64
+	winRecords         []*totalOrderingWinRecord
+	hash               common.Hash
+}
+
+// newTotalOrderingCandidateInfo constructs an totalOrderingCandidateInfo
+// instance.
+func newTotalOrderingCandidateInfo(
+	candidateHash common.Hash,
+	objCache *totalOrderingObjectCache) *totalOrderingCandidateInfo {
+	return &totalOrderingCandidateInfo{
+		ackedStatus: objCache.requestAckedStatus(),
+		winRecords:  objCache.requestWinRecordContainer(),
+		hash:        candidateHash,
+	}
+}
+
+// clean clear information related to another candidate, which should be called
+// when that candidate is selected as deliver set.
+func (v *totalOrderingCandidateInfo) clean(otherCandidateChainID uint32) {
+	v.winRecords[otherCandidateChainID] = nil
+}
+
+// recycle objects for later usage, this eases the loading of
+// golangs' GC.
+func (v *totalOrderingCandidateInfo) recycle(
+	objCache *totalOrderingObjectCache) {
+	if v.winRecords != nil {
+		for _, win := range v.winRecords {
+			objCache.recycleWinRecord(win)
+		}
+		objCache.recycleWinRecordContainer(v.winRecords)
+	}
+	if v.cachedHeightVector != nil {
+		objCache.recycleHeightVector(v.cachedHeightVector)
+	}
+	objCache.recycleAckedStatus(v.ackedStatus)
+}
+
+// addBlock would update totalOrderingCandidateInfo, it's caller's duty
+// to make sure the input block acutally acking the target block.
+func (v *totalOrderingCandidateInfo) addBlock(b *types.Block) (err error) {
+	rec := v.ackedStatus[b.Position.ChainID]
+	if rec.count == 0 {
+		rec.minHeight = b.Position.Height
+		rec.count = 1
+	} else {
+		if b.Position.Height < rec.minHeight {
+			err = ErrNotValidDAG
+			return
+		}
+		rec.count++
+	}
+	return
+}
+
+// getAckingNodeSetLength would generate the Acking Node Set and return its
+// length. Only block height larger than
+//
+//    global minimum height + k
+//
+// would be taken into consideration, ex.
+//
+//  For some chain X:
+//   - the global minimum acking height = 1,
+//   - k = 1
+//  then only block height >= 2 would be added to acking node set.
+func (v *totalOrderingCandidateInfo) getAckingNodeSetLength(
+	global *totalOrderingCandidateInfo,
+	k uint64,
+	numChains uint32) (count uint64) {
+	var rec *totalOrderingHeightRecord
+	for idx, gRec := range global.ackedStatus[:numChains] {
+		if gRec.count == 0 {
+			continue
+		}
+		rec = v.ackedStatus[idx]
+		if rec.count == 0 {
+			continue
+		}
+		// This line would check if these two ranges would overlap:
+		//  - (global minimum height + k, infinity)
+		//  - (local minimum height, local minimum height + count - 1)
+		if rec.minHeight+rec.count-1 >= gRec.minHeight+k {
+			count++
+		}
+	}
+	return
+}
+
+// updateAckingHeightVector would cached acking height vector.
+//
+// Only block height equals to (global minimum block height + k) would be
+// taken into consideration.
+func (v *totalOrderingCandidateInfo) updateAckingHeightVector(
+	global *totalOrderingCandidateInfo,
+	k uint64,
+	dirtyChainIDs []int,
+	objCache *totalOrderingObjectCache) {
+	var (
+		idx       int
+		gRec, rec *totalOrderingHeightRecord
+	)
+	// The reason not to merge the two loops is the iteration over map
+	// is expensive when chain count is large, iterating over dirty
+	// chains is cheaper.
+	// TODO(mission): merge the code in this if/else if the performance won't be
+	//                downgraded when adding a function for the shared part.
+	if v.cachedHeightVector == nil {
+		// Generate height vector from scratch.
+		v.cachedHeightVector = objCache.requestHeightVector()
+		for idx, gRec = range global.ackedStatus {
+			if gRec.count <= k {
+				continue
+			}
+			rec = v.ackedStatus[idx]
+			if rec.count == 0 {
+				v.cachedHeightVector[idx] = infinity
+			} else if rec.minHeight <= gRec.minHeight+k {
+				// This check is sufficient to make sure the block height:
+				//
+				//   gRec.minHeight + k
+				//
+				// would be included in this totalOrderingCandidateInfo.
+				v.cachedHeightVector[idx] = gRec.minHeight + k
+			} else {
+				v.cachedHeightVector[idx] = infinity
+			}
+		}
+	} else {
+		// Return the cached one, only update dirty fields.
+		for _, idx = range dirtyChainIDs {
+			gRec = global.ackedStatus[idx]
+			if gRec.count == 0 || gRec.count <= k {
+				v.cachedHeightVector[idx] = infinity
+				continue
+			}
+			rec = v.ackedStatus[idx]
+			if rec.count == 0 {
+				v.cachedHeightVector[idx] = infinity
+			} else if rec.minHeight <= gRec.minHeight+k {
+				v.cachedHeightVector[idx] = gRec.minHeight + k
+			} else {
+				v.cachedHeightVector[idx] = infinity
+			}
+		}
+	}
+	return
+}
+
+// updateWinRecord setup win records between two candidates.
+func (v *totalOrderingCandidateInfo) updateWinRecord(
+	otherChainID uint32,
+	other *totalOrderingCandidateInfo,
+	dirtyChainIDs []int,
+	objCache *totalOrderingObjectCache,
+	numChains uint32) {
+	var (
+		idx    int
+		height uint64
+	)
+	// The reason not to merge the two loops is the iteration over map
+	// is expensive when chain count is large, iterating over dirty
+	// chains is cheaper.
+	// TODO(mission): merge the code in this if/else if add a function won't
+	//                affect the performance.
+	win := v.winRecords[otherChainID]
+	if win == nil {
+		win = objCache.requestWinRecord()
+		v.winRecords[otherChainID] = win
+		for idx, height = range v.cachedHeightVector[:numChains] {
+			if height == infinity {
+				continue
+			}
+			if other.cachedHeightVector[idx] == infinity {
+				win.wins[idx] = 1
+				win.count++
+			}
+		}
+	} else {
+		for _, idx = range dirtyChainIDs {
+			if v.cachedHeightVector[idx] == infinity {
+				if win.wins[idx] == 1 {
+					win.wins[idx] = 0
+					win.count--
+				}
+				continue
+			}
+			if other.cachedHeightVector[idx] == infinity {
+				if win.wins[idx] == 0 {
+					win.wins[idx] = 1
+					win.count++
+				}
+			} else {
+				if win.wins[idx] == 1 {
+					win.wins[idx] = 0
+					win.count--
+				}
+			}
+		}
+	}
+}
+
+// totalOrderingBreakpoint is a record to store the height discontinuity
+// on a chain.
+type totalOrderingBreakpoint struct {
+	roundID uint64
+	// height of last block in previous round.
+	lastHeight uint64
+}
+
+// totalOrderingGroupVector keeps global status of current pending set.
+type totalOrderingGlobalVector struct {
+	// blocks stores all blocks grouped by their proposers and
+	// sorted by their block height.
+	//
+	// TODO(mission): the way we use this slice would make it reallocate
+	//                frequently.
+	blocks [][]*types.Block
+
+	// breakpoints caches rounds for chains that blocks' height on them are
+	// not continuous. Ex.
+	//   ChainID   Round   Height
+	//         1       0        0
+	//         1       0        1
+	//         1       1        2
+	//         1       1        3
+	//         1       1        4
+	//         1       3        0   <- a breakpoint for round 3 would be cached
+	//                                 for chain 1 as (roundID=1, lastHeight=4).
+	breakpoints [][]*totalOrderingBreakpoint
+
+	// curRound caches the last round ID used to purge breakpoints.
+	curRound uint64
+
+	// tips records the last seen block for each chain.
+	tips []*types.Block
+
+	// cachedCandidateInfo is an totalOrderingCandidateInfo instance,
+	// which is just used for actual candidates to calculate height vector.
+	cachedCandidateInfo *totalOrderingCandidateInfo
+}
+
+func newTotalOrderingGlobalVector(numChains uint32) *totalOrderingGlobalVector {
+	return &totalOrderingGlobalVector{
+		blocks:      make([][]*types.Block, numChains),
+		tips:        make([]*types.Block, numChains),
+		breakpoints: make([][]*totalOrderingBreakpoint, numChains),
+	}
+}
+
+func (global *totalOrderingGlobalVector) resize(numChains uint32) {
+	if len(global.blocks) >= int(numChains) {
+		return
+	}
+	// Resize blocks.
+	newBlocks := make([][]*types.Block, numChains)
+	copy(newBlocks, global.blocks)
+	global.blocks = newBlocks
+	// Resize breakpoints.
+	newBreakPoints := make([][]*totalOrderingBreakpoint, numChains)
+	copy(newBreakPoints, global.breakpoints)
+	global.breakpoints = newBreakPoints
+	// Resize tips.
+	newTips := make([]*types.Block, numChains)
+	copy(newTips, global.tips)
+	global.tips = newTips
+}
+
+func (global *totalOrderingGlobalVector) switchRound(roundID uint64) {
+	if global.curRound+1 != roundID {
+		panic(ErrUnexpected)
+	}
+	global.curRound = roundID
+	for chainID, bs := range global.breakpoints {
+		if len(bs) == 0 {
+			continue
+		}
+		if bs[0].roundID == roundID {
+			global.breakpoints[chainID] = bs[1:]
+		}
+	}
+}
+
+func (global *totalOrderingGlobalVector) prepareHeightRecord(
+	candidate *types.Block,
+	info *totalOrderingCandidateInfo,
+	acked map[common.Hash]struct{}) {
+	var (
+		chainID     = candidate.Position.ChainID
+		breakpoints = global.breakpoints[chainID]
+		breakpoint  *totalOrderingBreakpoint
+		rec         *totalOrderingHeightRecord
+	)
+	// Setup height record for own chain.
+	rec = &totalOrderingHeightRecord{
+		minHeight: candidate.Position.Height,
+	}
+	if len(breakpoints) == 0 {
+		rec.count = uint64(len(global.blocks[chainID]))
+	} else {
+		rec.count = breakpoints[0].lastHeight - candidate.Position.Height + 1
+	}
+	info.ackedStatus[chainID] = rec
+	if acked == nil {
+		return
+	}
+	for idx, blocks := range global.blocks {
+		if idx == int(candidate.Position.ChainID) {
+			continue
+		}
+		breakpoint = nil
+		if len(global.breakpoints[idx]) > 0 {
+			breakpoint = global.breakpoints[idx][0]
+		}
+		for i, b := range blocks {
+			if breakpoint != nil && b.Position.Round >= breakpoint.roundID {
+				break
+			}
+			if _, acked := acked[b.Hash]; !acked {
+				continue
+			}
+			// If this block acks this candidate, all newer blocks
+			// from the same chain also 'indirect' acks it.
+			rec = info.ackedStatus[idx]
+			rec.minHeight = b.Position.Height
+			if breakpoint == nil {
+				rec.count = uint64(len(blocks) - i)
+			} else {
+				rec.count = breakpoint.lastHeight - b.Position.Height + 1
+			}
+			break
+		}
+	}
+
+}
+
+func (global *totalOrderingGlobalVector) addBlock(
+	b *types.Block) (pos int, pending bool, err error) {
+	curPosition := b.Position
+	tip := global.tips[curPosition.ChainID]
+	pos = len(global.blocks[curPosition.ChainID])
+	if tip != nil {
+		// Perform light weight sanity check based on tip.
+		lastPosition := tip.Position
+		if lastPosition.Round > curPosition.Round {
+			err = ErrNotValidDAG
+			return
+		}
+		if DiffUint64(lastPosition.Round, curPosition.Round) > 1 {
+			if curPosition.Height != 0 {
+				err = ErrNotValidDAG
+				return
+			}
+			// Add breakpoint.
+			global.breakpoints[curPosition.ChainID] = append(
+				global.breakpoints[curPosition.ChainID],
+				&totalOrderingBreakpoint{
+					roundID:    curPosition.Round,
+					lastHeight: lastPosition.Height,
+				})
+		} else {
+			if curPosition.Height != lastPosition.Height+1 {
+				err = ErrNotValidDAG
+				return
+			}
+		}
+	} else {
+		if curPosition.Round < global.curRound {
+			err = ErrBlockFromPastRound
+			return
+		}
+		if curPosition.Round > global.curRound {
+			// Add breakpoint.
+			global.breakpoints[curPosition.ChainID] = append(
+				global.breakpoints[curPosition.ChainID],
+				&totalOrderingBreakpoint{
+					roundID:    curPosition.Round,
+					lastHeight: 0,
+				})
+		}
+	}
+	breakpoints := global.breakpoints[b.Position.ChainID]
+	pending = len(breakpoints) > 0 && breakpoints[0].roundID <= b.Position.Round
+	global.blocks[b.Position.ChainID] = append(
+		global.blocks[b.Position.ChainID], b)
+	global.tips[b.Position.ChainID] = b
+	return
+}
+
+// updateCandidateInfo udpate cached candidate info.
+func (global *totalOrderingGlobalVector) updateCandidateInfo(
+	dirtyChainIDs []int, objCache *totalOrderingObjectCache) {
+	var (
+		idx        int
+		blocks     []*types.Block
+		block      *types.Block
+		info       *totalOrderingCandidateInfo
+		rec        *totalOrderingHeightRecord
+		breakpoint *totalOrderingBreakpoint
+	)
+	if global.cachedCandidateInfo == nil {
+		info = newTotalOrderingCandidateInfo(common.Hash{}, objCache)
+		for idx, blocks = range global.blocks {
+			if len(blocks) == 0 {
+				continue
+			}
+			rec = info.ackedStatus[idx]
+			if len(global.breakpoints[idx]) > 0 {
+				breakpoint = global.breakpoints[idx][0]
+				block = blocks[0]
+				if block.Position.Round >= breakpoint.roundID {
+					continue
+				}
+				rec.minHeight = block.Position.Height
+				rec.count = breakpoint.lastHeight - block.Position.Height + 1
+			} else {
+				rec.minHeight = blocks[0].Position.Height
+				rec.count = uint64(len(blocks))
+			}
+		}
+		global.cachedCandidateInfo = info
+	} else {
+		info = global.cachedCandidateInfo
+		for _, idx = range dirtyChainIDs {
+			blocks = global.blocks[idx]
+			if len(blocks) == 0 {
+				info.ackedStatus[idx].count = 0
+				continue
+			}
+			rec = info.ackedStatus[idx]
+			if len(global.breakpoints[idx]) > 0 {
+				breakpoint = global.breakpoints[idx][0]
+				block = blocks[0]
+				if block.Position.Round >= breakpoint.roundID {
+					continue
+				}
+				rec.minHeight = block.Position.Height
+				rec.count = breakpoint.lastHeight - block.Position.Height + 1
+			} else {
+				rec.minHeight = blocks[0].Position.Height
+				rec.count = uint64(len(blocks))
+			}
+		}
+	}
+	return
+}
+
+// totalOrdering represent a process unit to handle total ordering
+// for blocks.
+type totalOrdering struct {
+	// pendings stores blocks awaiting to be ordered.
+	pendings map[common.Hash]*types.Block
+
+	// The round of config used when performing total ordering.
+	curRound uint64
+
+	// duringFlush is a flag to switch the flush mode and normal mode.
+	duringFlush bool
+
+	// flushReadyChains checks if the last block of that chain arrived. Once
+	// last blocks from all chains in current config are arrived, we can
+	// perform flush.
+	flushReadyChains map[uint32]struct{}
+
+	// flush is a map to record which blocks are already flushed.
+	flushed map[uint32]struct{}
+
+	// globalVector group all pending blocks by proposers and
+	// sort them by block height. This structure is helpful when:
+	//
+	//  - build global height vector
+	//  - picking candidates next round
+	globalVector *totalOrderingGlobalVector
+
+	// candidates caches result of potential function during generating
+	// preceding sets.
+	candidates []*totalOrderingCandidateInfo
+
+	// acked cache the 'block A acked by block B' relation by
+	// keeping a record in acked[A.Hash][B.Hash]
+	acked map[common.Hash]map[common.Hash]struct{}
+
+	// dirtyChainIDs records which chainID that should be updated
+	// for all cached status (win record, acking status).
+	dirtyChainIDs []int
+
+	// objCache caches allocated objects, like map.
+	objCache *totalOrderingObjectCache
+
+	// candidateChainMapping keeps a mapping from candidate's hash to
+	// their chain IDs.
+	candidateChainMapping map[uint32]common.Hash
+
+	// candidateChainIDs records chain ID of all candidates.
+	candidateChainIDs []uint32
+
+	// configs keeps configuration for each round in continuous way.
+	configs []*totalOrderingConfig
+}
+
+// newTotalOrdering constructs an totalOrdering instance.
+func newTotalOrdering(config *totalOrderingConfig) *totalOrdering {
+	globalVector := newTotalOrderingGlobalVector(config.numChains)
+	objCache := newTotalOrderingObjectCache(config.numChains)
+	candidates := make([]*totalOrderingCandidateInfo, config.numChains)
+	to := &totalOrdering{
+		pendings:              make(map[common.Hash]*types.Block),
+		globalVector:          globalVector,
+		dirtyChainIDs:         make([]int, 0, config.numChains),
+		acked:                 make(map[common.Hash]map[common.Hash]struct{}),
+		objCache:              objCache,
+		candidateChainMapping: make(map[uint32]common.Hash),
+		candidates:            candidates,
+		candidateChainIDs:     make([]uint32, 0, config.numChains),
+		curRound:              config.roundID,
+	}
+	to.configs = []*totalOrderingConfig{config}
+	return to
+}
+
+// appendConfig add new configs for upcoming rounds. If you add a config for
+// round R, next time you can only add the config for round R+1.
+func (to *totalOrdering) appendConfig(
+	round uint64, config *types.Config) error {
+	if round != uint64(len(to.configs))+to.configs[0].roundID {
+		return ErrRoundNotIncreasing
+	}
+	to.configs = append(
+		to.configs,
+		newTotalOrderingConfig(to.configs[len(to.configs)-1], config))
+	// Resize internal structures.
+	to.globalVector.resize(config.NumChains)
+	to.objCache.resize(config.NumChains)
+	if int(config.NumChains) > len(to.candidates) {
+		newCandidates := make([]*totalOrderingCandidateInfo, config.NumChains)
+		copy(newCandidates, to.candidates)
+		to.candidates = newCandidates
+	}
+	return nil
+}
+
+func (to *totalOrdering) switchRound() {
+	to.curRound++
+	to.globalVector.switchRound(to.curRound)
+}
+
+// buildBlockRelation populates the acked according their acking relationships.
+// This function would update all blocks implcitly acked by input block
+// recursively.
+func (to *totalOrdering) buildBlockRelation(b *types.Block) {
+	var (
+		curBlock, nextBlock      *types.Block
+		ack                      common.Hash
+		acked                    map[common.Hash]struct{}
+		exists, alreadyPopulated bool
+		toCheck                  = []*types.Block{b}
+	)
+	for {
+		if len(toCheck) == 0 {
+			break
+		}
+		curBlock, toCheck = toCheck[len(toCheck)-1], toCheck[:len(toCheck)-1]
+		if curBlock.Position.Round > b.Position.Round {
+			// It's illegal for a block to acking some block from future
+			// round, this rule should be promised before delivering to
+			// total ordering.
+			panic(ErrForwardAck)
+		}
+		for _, ack = range curBlock.Acks {
+			if acked, exists = to.acked[ack]; !exists {
+				acked = to.objCache.requestAckedVector()
+				to.acked[ack] = acked
+			}
+			// This means we've walked this block already.
+			if _, alreadyPopulated = acked[b.Hash]; alreadyPopulated {
+				continue
+			}
+			acked[b.Hash] = struct{}{}
+			// See if we need to go forward.
+			if nextBlock, exists = to.pendings[ack]; !exists {
+				continue
+			} else {
+				toCheck = append(toCheck, nextBlock)
+			}
+		}
+	}
+}
+
+// clean a block from working set. This behaviour would prevent
+// our memory usage growing infinity.
+func (to *totalOrdering) clean(b *types.Block) {
+	var (
+		h       = b.Hash
+		chainID = b.Position.ChainID
+	)
+	to.objCache.recycleAckedVector(to.acked[h])
+	delete(to.acked, h)
+	delete(to.pendings, h)
+	to.candidates[chainID].recycle(to.objCache)
+	to.candidates[chainID] = nil
+	delete(to.candidateChainMapping, chainID)
+	// Remove this candidate from candidate IDs.
+	to.candidateChainIDs =
+		removeFromSortedUint32Slice(to.candidateChainIDs, chainID)
+	// Clear records of this candidate from other candidates.
+	for _, idx := range to.candidateChainIDs {
+		to.candidates[idx].clean(chainID)
+	}
+}
+
+// updateVectors is a helper function to update all cached vectors.
+func (to *totalOrdering) updateVectors(b *types.Block) (pos int, err error) {
+	var (
+		candidateHash common.Hash
+		chainID       uint32
+		acked         bool
+		pending       bool
+	)
+	// Update global height vector
+	if pos, pending, err = to.globalVector.addBlock(b); err != nil {
+		return
+	}
+	if to.duringFlush {
+		// It makes no sense to calculate potential functions of total ordering
+		// when flushing would be happened.
+		return
+	}
+	if pending {
+		// The chain of this block contains breakpoints, which means their
+		// height are not continuous. This implementation of DEXON total
+		// ordering algorithm assumes the height of blocks in working set should
+		// be continuous.
+		//
+		// To workaround this issue, when block arrived after breakpoints,
+		// their information would not be contributed to current working set.
+		// This mechanism works because we switch rounds by flushing and
+		// reset the whole working set.
+		return
+	}
+	// Update acking status of candidates.
+	for chainID, candidateHash = range to.candidateChainMapping {
+		if _, acked = to.acked[candidateHash][b.Hash]; !acked {
+			continue
+		}
+		if err = to.candidates[chainID].addBlock(b); err != nil {
+			return
+		}
+	}
+	return
+}
+
+// prepareCandidate is a helper function to
+// build totalOrderingCandidateInfo for new candidate.
+func (to *totalOrdering) prepareCandidate(candidate *types.Block) {
+	var (
+		info    = newTotalOrderingCandidateInfo(candidate.Hash, to.objCache)
+		chainID = candidate.Position.ChainID
+	)
+	to.candidates[chainID] = info
+	to.candidateChainMapping[chainID] = candidate.Hash
+	// Add index to slot to allocated list, make sure the modified list sorted.
+	to.candidateChainIDs = append(to.candidateChainIDs, chainID)
+	sort.Slice(to.candidateChainIDs, func(i, j int) bool {
+		return to.candidateChainIDs[i] < to.candidateChainIDs[j]
+	})
+	to.globalVector.prepareHeightRecord(
+		candidate, info, to.acked[candidate.Hash])
+	return
+}
+
+// isAckOnlyPrecedings is a helper function to check if a block
+// only contain acks to delivered blocks.
+func (to *totalOrdering) isAckOnlyPrecedings(b *types.Block) bool {
+	for _, ack := range b.Acks {
+		if _, pending := to.pendings[ack]; pending {
+			return false
+		}
+	}
+	return true
+}
+
+// output is a helper function to finish the delivery of
+// deliverable preceding set.
+func (to *totalOrdering) output(
+	precedings map[common.Hash]struct{},
+	numChains uint32) (ret []*types.Block) {
+	for p := range precedings {
+		// Remove the first element from corresponding blockVector.
+		b := to.pendings[p]
+		chainID := b.Position.ChainID
+		// TODO(mission): This way to use slice makes it reallocate frequently.
+		to.globalVector.blocks[int(chainID)] =
+			to.globalVector.blocks[int(chainID)][1:]
+		ret = append(ret, b)
+		// Remove block relations.
+		to.clean(b)
+		to.dirtyChainIDs = append(to.dirtyChainIDs, int(chainID))
+	}
+	sort.Sort(types.ByHash(ret))
+	// Find new candidates from tip of globalVector of each chain.
+	// The complexity here is O(N^2logN).
+	// TODO(mission): only those tips that acking some blocks in
+	//                the devliered set should be checked. This
+	//                improvment related to the latency introduced by K.
+	for chainID, blocks := range to.globalVector.blocks[:numChains] {
+		if len(blocks) == 0 {
+			continue
+		}
+		if _, picked := to.candidateChainMapping[uint32(chainID)]; picked {
+			continue
+		}
+		if !to.isAckOnlyPrecedings(blocks[0]) {
+			continue
+		}
+		// Build totalOrderingCandidateInfo for new candidate.
+		to.prepareCandidate(blocks[0])
+	}
+	return ret
+}
+
+// generateDeliverSet would:
+//  - generate preceding set
+//  - check if the preceding set deliverable by checking potential function
+func (to *totalOrdering) generateDeliverSet() (
+	delivered map[common.Hash]struct{}, mode uint32) {
+	var (
+		chainID, otherChainID uint32
+		info, otherInfo       *totalOrderingCandidateInfo
+		precedings            = make(map[uint32]struct{})
+		cfg                   = to.configs[to.curRound-to.configs[0].roundID]
+	)
+	mode = TotalOrderingModeNormal
+	to.globalVector.updateCandidateInfo(to.dirtyChainIDs, to.objCache)
+	globalInfo := to.globalVector.cachedCandidateInfo
+	for _, chainID = range to.candidateChainIDs {
+		to.candidates[chainID].updateAckingHeightVector(
+			globalInfo, cfg.k, to.dirtyChainIDs, to.objCache)
+	}
+	// Update winning records for each candidate.
+	// TODO(mission): It's not reasonable to
+	//                request one routine for each candidate, the context
+	//                switch rate would be high.
+	var wg sync.WaitGroup
+	wg.Add(len(to.candidateChainIDs))
+	for _, chainID := range to.candidateChainIDs {
+		info = to.candidates[chainID]
+		go func(can uint32, canInfo *totalOrderingCandidateInfo) {
+			for _, otherChainID := range to.candidateChainIDs {
+				if can == otherChainID {
+					continue
+				}
+				canInfo.updateWinRecord(
+					otherChainID,
+					to.candidates[otherChainID],
+					to.dirtyChainIDs,
+					to.objCache,
+					cfg.numChains)
+			}
+			wg.Done()
+		}(chainID, info)
+	}
+	wg.Wait()
+	// Reset dirty chains.
+	to.dirtyChainIDs = to.dirtyChainIDs[:0]
+	// TODO(mission): ANS should be bound by current numChains.
+	globalAnsLength := globalInfo.getAckingNodeSetLength(
+		globalInfo, cfg.k, cfg.numChains)
+CheckNextCandidateLoop:
+	for _, chainID = range to.candidateChainIDs {
+		info = to.candidates[chainID]
+		for _, otherChainID = range to.candidateChainIDs {
+			if chainID == otherChainID {
+				continue
+			}
+			otherInfo = to.candidates[otherChainID]
+			// TODO(mission): grade should be bound by current numChains.
+			if otherInfo.winRecords[chainID].grade(
+				cfg.numChains, cfg.phi, globalAnsLength) != 0 {
+				continue CheckNextCandidateLoop
+			}
+		}
+		precedings[chainID] = struct{}{}
+	}
+	if len(precedings) == 0 {
+		return
+	}
+	// internal is a helper function to verify internal stability.
+	internal := func() bool {
+		var (
+			isPreceding, beaten bool
+			p                   uint32
+		)
+		for _, chainID = range to.candidateChainIDs {
+			if _, isPreceding = precedings[chainID]; isPreceding {
+				continue
+			}
+			beaten = false
+			for p = range precedings {
+				// TODO(mission): grade should be bound by current numChains.
+				if beaten = to.candidates[p].winRecords[chainID].grade(
+					cfg.numChains, cfg.phi, globalAnsLength) == 1; beaten {
+					break
+				}
+			}
+			if !beaten {
+				return false
+			}
+		}
+		return true
+	}
+	// checkAHV is a helper function to verify external stability.
+	// It would make sure some preceding block is strong enough
+	// to lead the whole preceding set.
+	checkAHV := func() bool {
+		var (
+			height, count uint64
+			p             uint32
+		)
+		for p = range precedings {
+			count = 0
+			info = to.candidates[p]
+			for _, height = range info.cachedHeightVector {
+				if height != infinity {
+					count++
+					if count > cfg.phi {
+						return true
+					}
+				}
+			}
+		}
+		return false
+	}
+	// checkANS is a helper function to verify external stability.
+	// It would make sure all preceding blocks are strong enough
+	// to be delivered.
+	checkANS := func() bool {
+		var chainAnsLength uint64
+		for p := range precedings {
+			// TODO(mission): ANS should be bound by current numChains.
+			chainAnsLength = to.candidates[p].getAckingNodeSetLength(
+				globalInfo, cfg.k, cfg.numChains)
+			if uint64(chainAnsLength) < uint64(cfg.numChains)-cfg.phi {
+				return false
+			}
+		}
+		return true
+	}
+	// If all chains propose enough blocks, we should force
+	// to deliver since the whole picture of the DAG is revealed.
+	if globalAnsLength != uint64(cfg.numChains) {
+		// Check internal stability first.
+		if !internal() {
+			return
+		}
+
+		// The whole picture is not ready, we need to check if
+		// exteranl stability is met, and we can deliver earlier.
+		if checkAHV() && checkANS() {
+			mode = TotalOrderingModeEarly
+		} else {
+			return
+		}
+	}
+	delivered = make(map[common.Hash]struct{})
+	for p := range precedings {
+		delivered[to.candidates[p].hash] = struct{}{}
+	}
+	return
+}
+
+// flushBlocks flushes blocks.
+func (to *totalOrdering) flushBlocks(
+	b *types.Block) (flushed []*types.Block, mode uint32, err error) {
+	cfg := to.configs[to.curRound-to.configs[0].roundID]
+	mode = TotalOrderingModeFlush
+	if cfg.isValidLastBlock(b) {
+		to.flushReadyChains[b.Position.ChainID] = struct{}{}
+	}
+	// Flush blocks until last blocks from all chains are arrived.
+	if len(to.flushReadyChains) < int(cfg.numChains) {
+		return
+	}
+	if len(to.flushReadyChains) > int(cfg.numChains) {
+		// This line should never be reached.
+		err = ErrFutureRoundDelivered
+		return
+	}
+	// Dump all blocks in this round.
+	for {
+		if len(to.flushed) == int(cfg.numChains) {
+			break
+		}
+		// Dump all candidates without checking potential function.
+		flushedHashes := make(map[common.Hash]struct{})
+		for _, chainID := range to.candidateChainIDs {
+			candidateBlock := to.pendings[to.candidates[chainID].hash]
+			if candidateBlock.Position.Round > to.curRound {
+				continue
+			}
+			flushedHashes[candidateBlock.Hash] = struct{}{}
+		}
+		if len(flushedHashes) == 0 {
+			err = ErrTotalOrderingHangs
+			return
+		}
+		flushedBlocks := to.output(flushedHashes, cfg.numChains)
+		for _, b := range flushedBlocks {
+			if !cfg.isValidLastBlock(b) {
+				continue
+			}
+			to.flushed[b.Position.ChainID] = struct{}{}
+		}
+		flushed = append(flushed, flushedBlocks...)
+	}
+	// Switch back to normal mode: delivered by DEXON total ordering algorithm.
+	to.duringFlush = false
+	to.flushed = make(map[uint32]struct{})
+	to.flushReadyChains = make(map[uint32]struct{})
+	// Clean all cached intermediate stats.
+	for idx := range to.candidates {
+		if to.candidates[idx] == nil {
+			continue
+		}
+		to.candidates[idx].recycle(to.objCache)
+		to.candidates[idx] = nil
+	}
+	to.dirtyChainIDs = nil
+	to.candidateChainMapping = make(map[uint32]common.Hash)
+	to.candidateChainIDs = nil
+	to.globalVector.cachedCandidateInfo = nil
+	to.switchRound()
+	// Force to pick new candidates.
+	numChains := to.configs[to.curRound-to.configs[0].roundID].numChains
+	to.output(map[common.Hash]struct{}{}, numChains)
+	return
+}
+
+// deliverBlocks delivers blocks by DEXON total ordering algorithm.
+func (to *totalOrdering) deliverBlocks() (
+	delivered []*types.Block, mode uint32, err error) {
+	hashes, mode := to.generateDeliverSet()
+	cfg := to.configs[to.curRound-to.configs[0].roundID]
+	// output precedings
+	delivered = to.output(hashes, cfg.numChains)
+	// Check if any block in delivered set are the last block in this round
+	// of that chain. If yes, flush or round-switching would be performed.
+	for _, b := range delivered {
+		if b.Position.Round > to.curRound {
+			err = ErrFutureRoundDelivered
+			return
+		}
+		if !cfg.isValidLastBlock(b) {
+			continue
+		}
+		if cfg.isFlushRequired {
+			// Switch to flush mode.
+			to.duringFlush = true
+			to.flushReadyChains = make(map[uint32]struct{})
+			to.flushed = make(map[uint32]struct{})
+		} else {
+			// Switch round directly.
+			to.switchRound()
+		}
+		break
+	}
+	if to.duringFlush {
+		// Make sure last blocks from all chains are marked as 'flushed'.
+		for _, b := range delivered {
+			if !cfg.isValidLastBlock(b) {
+				continue
+			}
+			to.flushed[b.Position.ChainID] = struct{}{}
+		}
+		// Some last blocks for the round to be flushed might not be delivered
+		// yet.
+		for _, tip := range to.globalVector.tips[:cfg.numChains] {
+			if tip.Position.Round > to.curRound || cfg.isValidLastBlock(tip) {
+				to.flushReadyChains[tip.Position.ChainID] = struct{}{}
+			}
+		}
+	}
+	return
+}
+
+// processBlock is the entry point of totalOrdering.
+func (to *totalOrdering) processBlock(
+	b *types.Block) ([]*types.Block, uint32, error) {
+	// NOTE: I assume the block 'b' is already safe for total ordering.
+	//       That means, all its acking blocks are during/after
+	//       total ordering stage.
+	cfg := to.configs[to.curRound-to.configs[0].roundID]
+	to.pendings[b.Hash] = b
+	to.buildBlockRelation(b)
+	pos, err := to.updateVectors(b)
+	if err != nil {
+		return nil, uint32(0), err
+	}
+	// Mark the proposer of incoming block as dirty.
+	if b.Position.ChainID < cfg.numChains {
+		to.dirtyChainIDs = append(to.dirtyChainIDs, int(b.Position.ChainID))
+		_, picked := to.candidateChainMapping[b.Position.ChainID]
+		if pos == 0 && !picked {
+			if to.isAckOnlyPrecedings(b) {
+				to.prepareCandidate(b)
+			}
+		}
+	}
+	if to.duringFlush {
+		return to.flushBlocks(b)
+	}
+	return to.deliverBlocks()
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/types/block-randomness.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/block-randomness.go
new file mode 100644
index 000000000..1eaa3e398
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/block-randomness.go
@@ -0,0 +1,43 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package types
+
+import (
+	"fmt"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+)
+
+// AgreementResult describes an agremeent result.
+type AgreementResult struct {
+	BlockHash common.Hash `json:"block_hash"`
+	Position  Position    `json:"position"`
+	Votes     []Vote      `json:"votes"`
+}
+
+func (r *AgreementResult) String() string {
+	return fmt.Sprintf(
+		"agreementResult[%s:%s]", r.BlockHash, &r.Position)
+}
+
+// BlockRandomnessResult describes a block randomness result
+type BlockRandomnessResult struct {
+	BlockHash  common.Hash `json:"block_hash"`
+	Position   Position    `json:"position"`
+	Randomness []byte      `json:"randomness"`
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/types/block.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/block.go
new file mode 100644
index 000000000..bde07d518
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/block.go
@@ -0,0 +1,341 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+// TODO(jimmy-dexon): remove comments of WitnessAck before open source.
+
+package types
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"sort"
+	"sync"
+	"time"
+
+	"github.com/dexon-foundation/dexon/rlp"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+)
+
+// BlockVerifyStatus is the return code for core.Application.VerifyBlock
+type BlockVerifyStatus int
+
+// Enums for return value of core.Application.VerifyBlock.
+const (
+	// VerifyOK: Block is verified.
+	VerifyOK BlockVerifyStatus = iota
+	// VerifyRetryLater: Block is unable to be verified at this moment.
+	// Try again later.
+	VerifyRetryLater
+	// VerifyInvalidBlock: Block is an invalid one.
+	VerifyInvalidBlock
+)
+
+var (
+	// blockPool is the blocks cache to reuse allocated blocks.
+	blockPool = sync.Pool{
+		New: func() interface{} {
+			return &Block{}
+		},
+	}
+)
+
+type rlpTimestamp struct {
+	time.Time
+}
+
+func (t *rlpTimestamp) EncodeRLP(w io.Writer) error {
+	return rlp.Encode(w, uint64(t.UTC().UnixNano()))
+}
+
+func (t *rlpTimestamp) DecodeRLP(s *rlp.Stream) error {
+	var nano uint64
+	err := s.Decode(&nano)
+	if err == nil {
+		sec := int64(nano) / 1000000000
+		nsec := int64(nano) % 1000000000
+		t.Time = time.Unix(sec, nsec).UTC()
+	}
+	return err
+}
+
+// FinalizationResult represents the result of DEXON consensus algorithm.
+type FinalizationResult struct {
+	ParentHash common.Hash `json:"parent_hash"`
+	Randomness []byte      `json:"randomness"`
+	Timestamp  time.Time   `json:"timestamp"`
+	Height     uint64      `json:"height"`
+}
+
+type rlpFinalizationResult struct {
+	ParentHash common.Hash
+	Randomness []byte
+	Timestamp  *rlpTimestamp
+	Height     uint64
+}
+
+// EncodeRLP implements rlp.Encoder
+func (f *FinalizationResult) EncodeRLP(w io.Writer) error {
+	return rlp.Encode(w, &rlpFinalizationResult{
+		ParentHash: f.ParentHash,
+		Randomness: f.Randomness,
+		Timestamp:  &rlpTimestamp{f.Timestamp},
+		Height:     f.Height,
+	})
+}
+
+// DecodeRLP implements rlp.Decoder
+func (f *FinalizationResult) DecodeRLP(s *rlp.Stream) error {
+	var dec rlpFinalizationResult
+	err := s.Decode(&dec)
+	if err == nil {
+		*f = FinalizationResult{
+			ParentHash: dec.ParentHash,
+			Randomness: dec.Randomness,
+			Timestamp:  dec.Timestamp.Time,
+			Height:     dec.Height,
+		}
+	}
+	return err
+}
+
+// Witness represents the consensus information on the compaction chain.
+type Witness struct {
+	Height uint64 `json:"height"`
+	Data   []byte `json:"data"`
+}
+
+// RecycleBlock put unused block into cache, which might be reused if
+// not garbage collected.
+func RecycleBlock(b *Block) {
+	blockPool.Put(b)
+}
+
+// NewBlock initiate a block.
+func NewBlock() (b *Block) {
+	b = blockPool.Get().(*Block)
+	b.Acks = b.Acks[:0]
+	return
+}
+
+// Block represents a single event broadcasted on the network.
+type Block struct {
+	ProposerID   NodeID              `json:"proposer_id"`
+	ParentHash   common.Hash         `json:"parent_hash"`
+	Hash         common.Hash         `json:"hash"`
+	Position     Position            `json:"position"`
+	Timestamp    time.Time           `json:"timestamp"`
+	Acks         common.SortedHashes `json:"acks"`
+	Payload      []byte              `json:"payload"`
+	PayloadHash  common.Hash         `json:"payload_hash"`
+	Witness      Witness             `json:"witness"`
+	Finalization FinalizationResult  `json:"finalization"`
+	Signature    crypto.Signature    `json:"signature"`
+
+	CRSSignature crypto.Signature `json:"crs_signature"`
+}
+
+type rlpBlock struct {
+	ProposerID   NodeID
+	ParentHash   common.Hash
+	Hash         common.Hash
+	Position     Position
+	Timestamp    *rlpTimestamp
+	Acks         common.SortedHashes
+	Payload      []byte
+	PayloadHash  common.Hash
+	Witness      *Witness
+	Finalization *FinalizationResult
+	Signature    crypto.Signature
+
+	CRSSignature crypto.Signature
+}
+
+// EncodeRLP implements rlp.Encoder
+func (b *Block) EncodeRLP(w io.Writer) error {
+	return rlp.Encode(w, rlpBlock{
+		ProposerID:   b.ProposerID,
+		ParentHash:   b.ParentHash,
+		Hash:         b.Hash,
+		Position:     b.Position,
+		Timestamp:    &rlpTimestamp{b.Timestamp},
+		Acks:         b.Acks,
+		Payload:      b.Payload,
+		PayloadHash:  b.PayloadHash,
+		Witness:      &b.Witness,
+		Finalization: &b.Finalization,
+		Signature:    b.Signature,
+		CRSSignature: b.CRSSignature,
+	})
+}
+
+// DecodeRLP implements rlp.Decoder
+func (b *Block) DecodeRLP(s *rlp.Stream) error {
+	var dec rlpBlock
+	err := s.Decode(&dec)
+	if err == nil {
+		*b = Block{
+			ProposerID:   dec.ProposerID,
+			ParentHash:   dec.ParentHash,
+			Hash:         dec.Hash,
+			Position:     dec.Position,
+			Timestamp:    dec.Timestamp.Time,
+			Acks:         dec.Acks,
+			Payload:      dec.Payload,
+			PayloadHash:  dec.PayloadHash,
+			Witness:      *dec.Witness,
+			Finalization: *dec.Finalization,
+			Signature:    dec.Signature,
+			CRSSignature: dec.CRSSignature,
+		}
+	}
+	return err
+}
+
+func (b *Block) String() string {
+	return fmt.Sprintf("Block(%v:%d:%d)", b.Hash.String()[:6],
+		b.Position.ChainID, b.Position.Height)
+}
+
+// Clone returns a deep copy of a block.
+func (b *Block) Clone() (bcopy *Block) {
+	bcopy = NewBlock()
+	bcopy.ProposerID = b.ProposerID
+	bcopy.ParentHash = b.ParentHash
+	bcopy.Hash = b.Hash
+	bcopy.Position.Round = b.Position.Round
+	bcopy.Position.ChainID = b.Position.ChainID
+	bcopy.Position.Height = b.Position.Height
+	bcopy.Signature = b.Signature.Clone()
+	bcopy.CRSSignature = b.CRSSignature.Clone()
+	bcopy.Finalization.ParentHash = b.Finalization.ParentHash
+	bcopy.Finalization.Timestamp = b.Finalization.Timestamp
+	bcopy.Finalization.Height = b.Finalization.Height
+	bcopy.Witness.Height = b.Witness.Height
+	bcopy.Witness.Data = make([]byte, len(b.Witness.Data))
+	copy(bcopy.Witness.Data, b.Witness.Data)
+	bcopy.Timestamp = b.Timestamp
+	bcopy.Acks = make(common.SortedHashes, len(b.Acks))
+	copy(bcopy.Acks, b.Acks)
+	bcopy.Payload = make([]byte, len(b.Payload))
+	copy(bcopy.Payload, b.Payload)
+	bcopy.PayloadHash = b.PayloadHash
+	bcopy.Finalization.Randomness = make([]byte, len(b.Finalization.Randomness))
+	copy(bcopy.Finalization.Randomness, b.Finalization.Randomness)
+	return
+}
+
+// IsGenesis checks if the block is a genesisBlock
+func (b *Block) IsGenesis() bool {
+	return b.Position.Height == 0 && b.ParentHash == common.Hash{}
+}
+
+// IsFinalized checks if the finalization data is ready.
+func (b *Block) IsFinalized() bool {
+	return b.Finalization.Height != 0
+}
+
+// IsEmpty checks if the block is an 'empty block'.
+func (b *Block) IsEmpty() bool {
+	return b.ProposerID.Hash == common.Hash{}
+}
+
+// IsAcking checks if a block acking another by it's hash.
+func (b *Block) IsAcking(hash common.Hash) bool {
+	idx := sort.Search(len(b.Acks), func(i int) bool {
+		return bytes.Compare(b.Acks[i][:], hash[:]) >= 0
+	})
+	return !(idx == len(b.Acks) || b.Acks[idx] != hash)
+}
+
+// ByHash is the helper type for sorting slice of blocks by hash.
+type ByHash []*Block
+
+func (b ByHash) Len() int {
+	return len(b)
+}
+
+func (b ByHash) Less(i int, j int) bool {
+	return bytes.Compare([]byte(b[i].Hash[:]), []byte(b[j].Hash[:])) == -1
+}
+
+func (b ByHash) Swap(i int, j int) {
+	b[i], b[j] = b[j], b[i]
+}
+
+// ByPosition is the helper type for sorting slice of blocks by position.
+type ByPosition []*Block
+
+// Len implements Len method in sort.Sort interface.
+func (bs ByPosition) Len() int {
+	return len(bs)
+}
+
+// Less implements Less method in sort.Sort interface.
+func (bs ByPosition) Less(i int, j int) bool {
+	return bs[j].Position.Newer(&bs[i].Position)
+}
+
+// Swap implements Swap method in sort.Sort interface.
+func (bs ByPosition) Swap(i int, j int) {
+	bs[i], bs[j] = bs[j], bs[i]
+}
+
+// Push implements Push method in heap interface.
+func (bs *ByPosition) Push(x interface{}) {
+	*bs = append(*bs, x.(*Block))
+}
+
+// Pop implements Pop method in heap interface.
+func (bs *ByPosition) Pop() (ret interface{}) {
+	n := len(*bs)
+	*bs, ret = (*bs)[0:n-1], (*bs)[n-1]
+	return
+}
+
+// ByFinalizationHeight is the helper type for sorting slice of blocks by
+// finalization height.
+type ByFinalizationHeight []*Block
+
+// Len implements Len method in sort.Sort interface.
+func (bs ByFinalizationHeight) Len() int {
+	return len(bs)
+}
+
+// Less implements Less method in sort.Sort interface.
+func (bs ByFinalizationHeight) Less(i int, j int) bool {
+	return bs[i].Finalization.Height < bs[j].Finalization.Height
+}
+
+// Swap implements Swap method in sort.Sort interface.
+func (bs ByFinalizationHeight) Swap(i int, j int) {
+	bs[i], bs[j] = bs[j], bs[i]
+}
+
+// Push implements Push method in heap interface.
+func (bs *ByFinalizationHeight) Push(x interface{}) {
+	*bs = append(*bs, x.(*Block))
+}
+
+// Pop implements Pop method in heap interface.
+func (bs *ByFinalizationHeight) Pop() (ret interface{}) {
+	n := len(*bs)
+	*bs, ret = (*bs)[0:n-1], (*bs)[n-1]
+	return
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/types/config.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/config.go
new file mode 100644
index 000000000..975eec9cb
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/config.go
@@ -0,0 +1,109 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package types
+
+import (
+	"encoding/binary"
+	"math"
+	"time"
+)
+
+// Config stands for Current Configuration Parameters.
+type Config struct {
+	// Network related.
+	NumChains uint32
+
+	// Lambda related.
+	LambdaBA  time.Duration
+	LambdaDKG time.Duration
+
+	// Total ordering related.
+	K        int
+	PhiRatio float32
+
+	// Set related.
+	NotarySetSize uint32
+	DKGSetSize    uint32
+
+	// Time related.
+	RoundInterval    time.Duration
+	MinBlockInterval time.Duration
+	MaxBlockInterval time.Duration
+}
+
+// Clone return a copied configuration.
+func (c *Config) Clone() *Config {
+	return &Config{
+		NumChains:        c.NumChains,
+		LambdaBA:         c.LambdaBA,
+		LambdaDKG:        c.LambdaDKG,
+		K:                c.K,
+		PhiRatio:         c.PhiRatio,
+		NotarySetSize:    c.NotarySetSize,
+		DKGSetSize:       c.DKGSetSize,
+		RoundInterval:    c.RoundInterval,
+		MinBlockInterval: c.MinBlockInterval,
+		MaxBlockInterval: c.MaxBlockInterval,
+	}
+}
+
+// Bytes returns []byte representation of Config.
+func (c *Config) Bytes() []byte {
+	binaryNumChains := make([]byte, 4)
+	binary.LittleEndian.PutUint32(binaryNumChains, c.NumChains)
+
+	binaryLambdaBA := make([]byte, 8)
+	binary.LittleEndian.PutUint64(
+		binaryLambdaBA, uint64(c.LambdaBA.Nanoseconds()))
+	binaryLambdaDKG := make([]byte, 8)
+	binary.LittleEndian.PutUint64(
+		binaryLambdaDKG, uint64(c.LambdaDKG.Nanoseconds()))
+
+	binaryK := make([]byte, 4)
+	binary.LittleEndian.PutUint32(binaryK, uint32(c.K))
+	binaryPhiRatio := make([]byte, 4)
+	binary.LittleEndian.PutUint32(binaryPhiRatio, math.Float32bits(c.PhiRatio))
+
+	binaryNotarySetSize := make([]byte, 4)
+	binary.LittleEndian.PutUint32(binaryNotarySetSize, c.NotarySetSize)
+	binaryDKGSetSize := make([]byte, 4)
+	binary.LittleEndian.PutUint32(binaryDKGSetSize, c.DKGSetSize)
+
+	binaryRoundInterval := make([]byte, 8)
+	binary.LittleEndian.PutUint64(binaryRoundInterval,
+		uint64(c.RoundInterval.Nanoseconds()))
+	binaryMinBlockInterval := make([]byte, 8)
+	binary.LittleEndian.PutUint64(binaryMinBlockInterval,
+		uint64(c.MinBlockInterval.Nanoseconds()))
+	binaryMaxBlockInterval := make([]byte, 8)
+	binary.LittleEndian.PutUint64(binaryMaxBlockInterval,
+		uint64(c.MaxBlockInterval.Nanoseconds()))
+
+	enc := make([]byte, 0, 40)
+	enc = append(enc, binaryNumChains...)
+	enc = append(enc, binaryLambdaBA...)
+	enc = append(enc, binaryLambdaDKG...)
+	enc = append(enc, binaryK...)
+	enc = append(enc, binaryPhiRatio...)
+	enc = append(enc, binaryNotarySetSize...)
+	enc = append(enc, binaryDKGSetSize...)
+	enc = append(enc, binaryRoundInterval...)
+	enc = append(enc, binaryMinBlockInterval...)
+	enc = append(enc, binaryMaxBlockInterval...)
+	return enc
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/types/dkg/dkg.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/dkg/dkg.go
new file mode 100644
index 000000000..4053c5a28
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/dkg/dkg.go
@@ -0,0 +1,194 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package dkg
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+
+	"github.com/dexon-foundation/dexon/rlp"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	cryptoDKG "github.com/dexon-foundation/dexon-consensus/core/crypto/dkg"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+// PrivateShare describe a secret share in DKG protocol.
+type PrivateShare struct {
+	ProposerID   types.NodeID         `json:"proposer_id"`
+	ReceiverID   types.NodeID         `json:"receiver_id"`
+	Round        uint64               `json:"round"`
+	PrivateShare cryptoDKG.PrivateKey `json:"private_share"`
+	Signature    crypto.Signature     `json:"signature"`
+}
+
+// Equal checks equality between two PrivateShare instances.
+func (p *PrivateShare) Equal(other *PrivateShare) bool {
+	return p.ProposerID.Equal(other.ProposerID) &&
+		p.ReceiverID.Equal(other.ReceiverID) &&
+		p.Round == other.Round &&
+		p.Signature.Type == other.Signature.Type &&
+		bytes.Compare(p.Signature.Signature, other.Signature.Signature) == 0 &&
+		bytes.Compare(
+			p.PrivateShare.Bytes(), other.PrivateShare.Bytes()) == 0
+}
+
+// MasterPublicKey decrtibe a master public key in DKG protocol.
+type MasterPublicKey struct {
+	ProposerID      types.NodeID              `json:"proposer_id"`
+	Round           uint64                    `json:"round"`
+	DKGID           cryptoDKG.ID              `json:"dkg_id"`
+	PublicKeyShares cryptoDKG.PublicKeyShares `json:"public_key_shares"`
+	Signature       crypto.Signature          `json:"signature"`
+}
+
+func (d *MasterPublicKey) String() string {
+	return fmt.Sprintf("MasterPublicKey[%s:%d]",
+		d.ProposerID.String()[:6],
+		d.Round)
+}
+
+// Equal check equality of two DKG master public keys.
+func (d *MasterPublicKey) Equal(other *MasterPublicKey) bool {
+	return d.ProposerID.Equal(other.ProposerID) &&
+		d.Round == other.Round &&
+		d.DKGID.GetHexString() == other.DKGID.GetHexString() &&
+		d.PublicKeyShares.Equal(&other.PublicKeyShares) &&
+		d.Signature.Type == other.Signature.Type &&
+		bytes.Compare(d.Signature.Signature, other.Signature.Signature) == 0
+}
+
+type rlpMasterPublicKey struct {
+	ProposerID      types.NodeID
+	Round           uint64
+	DKGID           []byte
+	PublicKeyShares *cryptoDKG.PublicKeyShares
+	Signature       crypto.Signature
+}
+
+// EncodeRLP implements rlp.Encoder
+func (d *MasterPublicKey) EncodeRLP(w io.Writer) error {
+	return rlp.Encode(w, rlpMasterPublicKey{
+		ProposerID:      d.ProposerID,
+		Round:           d.Round,
+		DKGID:           d.DKGID.GetLittleEndian(),
+		PublicKeyShares: &d.PublicKeyShares,
+		Signature:       d.Signature,
+	})
+}
+
+// DecodeRLP implements rlp.Decoder
+func (d *MasterPublicKey) DecodeRLP(s *rlp.Stream) error {
+	var dec rlpMasterPublicKey
+	if err := s.Decode(&dec); err != nil {
+		return err
+	}
+
+	id, err := cryptoDKG.BytesID(dec.DKGID)
+	if err != nil {
+		return err
+	}
+
+	*d = MasterPublicKey{
+		ProposerID:      dec.ProposerID,
+		Round:           dec.Round,
+		DKGID:           id,
+		PublicKeyShares: *dec.PublicKeyShares,
+		Signature:       dec.Signature,
+	}
+	return err
+}
+
+// NewMasterPublicKey returns a new MasterPublicKey instance.
+func NewMasterPublicKey() *MasterPublicKey {
+	return &MasterPublicKey{
+		PublicKeyShares: *cryptoDKG.NewEmptyPublicKeyShares(),
+	}
+}
+
+// UnmarshalJSON implements json.Unmarshaller.
+func (d *MasterPublicKey) UnmarshalJSON(data []byte) error {
+	type innertMasterPublicKey MasterPublicKey
+	d.PublicKeyShares = *cryptoDKG.NewEmptyPublicKeyShares()
+	return json.Unmarshal(data, (*innertMasterPublicKey)(d))
+}
+
+// Complaint describe a complaint in DKG protocol.
+type Complaint struct {
+	ProposerID   types.NodeID     `json:"proposer_id"`
+	Round        uint64           `json:"round"`
+	PrivateShare PrivateShare     `json:"private_share"`
+	Signature    crypto.Signature `json:"signature"`
+}
+
+func (c *Complaint) String() string {
+	if c.IsNack() {
+		return fmt.Sprintf("DKGNackComplaint[%s:%d]%s",
+			c.ProposerID.String()[:6], c.Round,
+			c.PrivateShare.ProposerID.String()[:6])
+	}
+	return fmt.Sprintf("Complaint[%s:%d]%v",
+		c.ProposerID.String()[:6], c.Round, c.PrivateShare)
+}
+
+// Equal checks equality between two Complaint instances.
+func (c *Complaint) Equal(other *Complaint) bool {
+	return c.ProposerID.Equal(other.ProposerID) &&
+		c.Round == other.Round &&
+		c.PrivateShare.Equal(&other.PrivateShare) &&
+		c.Signature.Type == other.Signature.Type &&
+		bytes.Compare(c.Signature.Signature, other.Signature.Signature) == 0
+}
+
+// PartialSignature describe a partial signature in DKG protocol.
+type PartialSignature struct {
+	ProposerID       types.NodeID               `json:"proposer_id"`
+	Round            uint64                     `json:"round"`
+	Hash             common.Hash                `json:"hash"`
+	PartialSignature cryptoDKG.PartialSignature `json:"partial_signature"`
+	Signature        crypto.Signature           `json:"signature"`
+}
+
+// Finalize describe a dig finalize message in DKG protocol.
+type Finalize struct {
+	ProposerID types.NodeID     `json:"proposer_id"`
+	Round      uint64           `json:"round"`
+	Signature  crypto.Signature `json:"signature"`
+}
+
+func (final *Finalize) String() string {
+	return fmt.Sprintf("DKGFinal[%s:%d]",
+		final.ProposerID.String()[:6],
+		final.Round)
+}
+
+// Equal check equality of two Finalize instances.
+func (final *Finalize) Equal(other *Finalize) bool {
+	return final.ProposerID.Equal(other.ProposerID) &&
+		final.Round == other.Round &&
+		final.Signature.Type == other.Signature.Type &&
+		bytes.Compare(final.Signature.Signature, other.Signature.Signature) == 0
+}
+
+// IsNack returns true if it's a nack complaint in DKG protocol.
+func (c *Complaint) IsNack() bool {
+	return len(c.PrivateShare.Signature.Signature) == 0
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/types/node.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/node.go
new file mode 100644
index 000000000..2c90f65c8
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/node.go
@@ -0,0 +1,56 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package types
+
+import (
+	"bytes"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+)
+
+// NodeID is the ID type for nodes.
+type NodeID struct {
+	common.Hash
+}
+
+// NewNodeID returns a NodeID with Hash set to the hash value of
+// public key.
+func NewNodeID(pubKey crypto.PublicKey) NodeID {
+	return NodeID{Hash: crypto.Keccak256Hash(pubKey.Bytes()[1:])}
+}
+
+// Equal checks if the hash representation is the same NodeID.
+func (v NodeID) Equal(v2 NodeID) bool {
+	return v.Hash == v2.Hash
+}
+
+// NodeIDs implements sort.Interface for NodeID.
+type NodeIDs []NodeID
+
+func (v NodeIDs) Len() int {
+	return len(v)
+}
+
+func (v NodeIDs) Less(i int, j int) bool {
+	return bytes.Compare([]byte(v[i].Hash[:]), []byte(v[j].Hash[:])) == -1
+}
+
+func (v NodeIDs) Swap(i int, j int) {
+	v[i], v[j] = v[j], v[i]
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/types/nodeset.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/nodeset.go
new file mode 100644
index 000000000..3222b3c2f
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/nodeset.go
@@ -0,0 +1,145 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package types
+
+import (
+	"container/heap"
+	"encoding/binary"
+	"math/big"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+)
+
+// NodeSet is the node set structure as defined in DEXON consensus core.
+type NodeSet struct {
+	IDs map[NodeID]struct{}
+}
+
+// SubSetTarget is the sub set target for GetSubSet().
+type SubSetTarget *big.Int
+
+type subSetTargetType byte
+
+const (
+	targetNotarySet subSetTargetType = iota
+	targetDKGSet
+)
+
+type nodeRank struct {
+	ID   NodeID
+	rank *big.Int
+}
+
+// rankHeap is a MaxHeap structure.
+type rankHeap []*nodeRank
+
+func (h rankHeap) Len() int           { return len(h) }
+func (h rankHeap) Less(i, j int) bool { return h[i].rank.Cmp(h[j].rank) > 0 }
+func (h rankHeap) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
+func (h *rankHeap) Push(x interface{}) {
+	*h = append(*h, x.(*nodeRank))
+}
+func (h *rankHeap) Pop() interface{} {
+	old := *h
+	n := len(old)
+	x := old[n-1]
+	*h = old[0 : n-1]
+	return x
+}
+
+// NewNodeSet creates a new NodeSet instance.
+func NewNodeSet() *NodeSet {
+	return &NodeSet{
+		IDs: make(map[NodeID]struct{}),
+	}
+}
+
+// NewNotarySetTarget is the target for getting Notary Set.
+func NewNotarySetTarget(crs common.Hash, chainID uint32) SubSetTarget {
+	binaryChainID := make([]byte, 4)
+	binary.LittleEndian.PutUint32(binaryChainID, chainID)
+
+	return newTarget(targetNotarySet, crs[:], binaryChainID)
+}
+
+// NewDKGSetTarget  is the target for getting DKG Set.
+func NewDKGSetTarget(crs common.Hash) SubSetTarget {
+	return newTarget(targetDKGSet, crs[:])
+}
+
+// Add a NodeID to the set.
+func (ns *NodeSet) Add(ID NodeID) {
+	ns.IDs[ID] = struct{}{}
+}
+
+// Clone the NodeSet.
+func (ns *NodeSet) Clone() *NodeSet {
+	nsCopy := NewNodeSet()
+	for ID := range ns.IDs {
+		nsCopy.Add(ID)
+	}
+	return nsCopy
+}
+
+// GetSubSet returns the subset of given target.
+func (ns *NodeSet) GetSubSet(
+	size int, target SubSetTarget) map[NodeID]struct{} {
+	h := rankHeap{}
+	idx := 0
+	for nID := range ns.IDs {
+		if idx < size {
+			h = append(h, newNodeRank(nID, target))
+		} else if idx == size {
+			heap.Init(&h)
+		}
+		if idx >= size {
+			rank := newNodeRank(nID, target)
+			if rank.rank.Cmp(h[0].rank) < 0 {
+				h[0] = rank
+				heap.Fix(&h, 0)
+			}
+		}
+		idx++
+	}
+
+	nIDs := make(map[NodeID]struct{}, size)
+	for _, rank := range h {
+		nIDs[rank.ID] = struct{}{}
+	}
+
+	return nIDs
+}
+
+func newTarget(targetType subSetTargetType, data ...[]byte) SubSetTarget {
+	data = append(data, []byte{byte(targetType)})
+	h := crypto.Keccak256Hash(data...)
+	num := big.NewInt(0)
+	num.SetBytes(h[:])
+	return SubSetTarget(num)
+}
+
+func newNodeRank(ID NodeID, target SubSetTarget) *nodeRank {
+	num := big.NewInt(0)
+	num.SetBytes(ID.Hash[:])
+	num.Abs(num.Sub((*big.Int)(target), num))
+	return &nodeRank{
+		ID:   ID,
+		rank: num,
+	}
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/types/position.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/position.go
new file mode 100644
index 000000000..404f3035e
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/position.go
@@ -0,0 +1,74 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package types
+
+import (
+	"fmt"
+)
+
+// Position describes the position in the block lattice of an entity.
+type Position struct {
+	ChainID uint32 `json:"chain_id"`
+	Round   uint64 `json:"round"`
+	Height  uint64 `json:"height"`
+}
+
+func (pos *Position) String() string {
+	return fmt.Sprintf("pos[%d:%d:%d]", pos.Round, pos.ChainID, pos.Height)
+}
+
+// Equal checks if two positions are equal, it panics when their chainIDs
+// are different.
+func (pos *Position) Equal(other *Position) bool {
+	if pos.ChainID != other.ChainID {
+		panic(fmt.Errorf("unexpected chainID %d, should be %d",
+			other.ChainID, pos.ChainID))
+	}
+	return pos.Round == other.Round && pos.Height == other.Height
+}
+
+// Newer checks if one block is newer than another one on the same chain.
+// If two blocks on different chain compared by this function, it would panic.
+func (pos *Position) Newer(other *Position) bool {
+	if pos.ChainID != other.ChainID {
+		panic(fmt.Errorf("unexpected chainID %d, should be %d",
+			other.ChainID, pos.ChainID))
+	}
+	return pos.Round > other.Round ||
+		(pos.Round == other.Round && pos.Height > other.Height)
+}
+
+// Older checks if one block is older than another one on the same chain.
+// If two blocks on different chain compared by this function, it would panic.
+func (pos *Position) Older(other *Position) bool {
+	if pos.ChainID != other.ChainID {
+		panic(fmt.Errorf("unexpected chainID %d, should be %d",
+			other.ChainID, pos.ChainID))
+	}
+	return pos.Round < other.Round ||
+		(pos.Round == other.Round && pos.Height < other.Height)
+}
+
+// Clone a position instance.
+func (pos *Position) Clone() *Position {
+	return &Position{
+		ChainID: pos.ChainID,
+		Round:   pos.Round,
+		Height:  pos.Height,
+	}
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/types/vote.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/vote.go
new file mode 100644
index 000000000..32fb8982d
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/types/vote.go
@@ -0,0 +1,65 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package types
+
+import (
+	"fmt"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+)
+
+// VoteType is the type of vote.
+type VoteType byte
+
+// VoteType enum.
+const (
+	VoteInit VoteType = iota
+	VotePreCom
+	VoteCom
+	// Do not add any type below MaxVoteType.
+	MaxVoteType
+)
+
+// Vote is the vote structure defined in Crypto Shuffle Algorithm.
+type Vote struct {
+	ProposerID NodeID           `json:"proposer_id"`
+	Type       VoteType         `json:"type"`
+	BlockHash  common.Hash      `json:"block_hash"`
+	Period     uint64           `json:"period"`
+	Position   Position         `json:"position"`
+	Signature  crypto.Signature `json:"signature"`
+}
+
+func (v *Vote) String() string {
+	return fmt.Sprintf("Vote[%s:%d:%d](%d:%d):%s",
+		v.ProposerID.String()[:6], v.Position.ChainID, v.Position.Height,
+		v.Period, v.Type, v.BlockHash.String()[:6])
+}
+
+// Clone returns a deep copy of a vote.
+func (v *Vote) Clone() *Vote {
+	return &Vote{
+		ProposerID: v.ProposerID,
+		Type:       v.Type,
+		BlockHash:  v.BlockHash,
+		Period:     v.Period,
+		Position:   v.Position,
+		Signature:  v.Signature.Clone(),
+	}
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/utils.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils.go
new file mode 100644
index 000000000..6b9ce634f
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils.go
@@ -0,0 +1,161 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"sort"
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+var (
+	debug = false
+	// ErrEmptyTimestamps would be reported if Block.timestamps is empty.
+	ErrEmptyTimestamps = errors.New("timestamp vector should not be empty")
+)
+
+func init() {
+	if os.Getenv("DEBUG") != "" {
+		debug = true
+	}
+}
+
+// Debugf is like fmt.Printf, but only output when we are in debug mode.
+func Debugf(format string, args ...interface{}) {
+	if debug {
+		fmt.Printf(format, args...)
+	}
+}
+
+// Debugln is like fmt.Println, but only output when we are in debug mode.
+func Debugln(args ...interface{}) {
+	if debug {
+		fmt.Println(args)
+	}
+}
+
+func interpoTime(t1 time.Time, t2 time.Time, sep int) []time.Time {
+	if sep == 0 {
+		return []time.Time{}
+	}
+	if t1.After(t2) {
+		return interpoTime(t2, t1, sep)
+	}
+	timestamps := make([]time.Time, sep)
+	duration := t2.Sub(t1)
+	period := time.Duration(
+		(duration.Nanoseconds() / int64(sep+1))) * time.Nanosecond
+	prevTime := t1
+	for idx := range timestamps {
+		prevTime = prevTime.Add(period)
+		timestamps[idx] = prevTime
+	}
+	return timestamps
+}
+
+func getMedianTime(timestamps []time.Time) (t time.Time, err error) {
+	if len(timestamps) == 0 {
+		err = ErrEmptyTimestamps
+		return
+	}
+	tscopy := make([]time.Time, 0, len(timestamps))
+	for _, ts := range timestamps {
+		tscopy = append(tscopy, ts)
+	}
+	sort.Sort(common.ByTime(tscopy))
+	if len(tscopy)%2 == 0 {
+		t1 := tscopy[len(tscopy)/2-1]
+		t2 := tscopy[len(tscopy)/2]
+		t = interpoTime(t1, t2, 1)[0]
+	} else {
+		t = tscopy[len(tscopy)/2]
+	}
+	return
+}
+
+func removeFromSortedUint32Slice(xs []uint32, x uint32) []uint32 {
+	indexToRemove := sort.Search(len(xs), func(idx int) bool {
+		return xs[idx] >= x
+	})
+	if indexToRemove == len(xs) || xs[indexToRemove] != x {
+		// This value is not found.
+		return xs
+	}
+	return append(xs[:indexToRemove], xs[indexToRemove+1:]...)
+}
+
+// HashConfigurationBlock returns the hash value of configuration block.
+func HashConfigurationBlock(
+	notarySet map[types.NodeID]struct{},
+	config *types.Config,
+	snapshotHash common.Hash,
+	prevHash common.Hash,
+) common.Hash {
+	notaryIDs := make(types.NodeIDs, 0, len(notarySet))
+	for nID := range notarySet {
+		notaryIDs = append(notaryIDs, nID)
+	}
+	sort.Sort(notaryIDs)
+	notarySetBytes := make([]byte, 0, len(notarySet)*len(common.Hash{}))
+	for _, nID := range notaryIDs {
+		notarySetBytes = append(notarySetBytes, nID.Hash[:]...)
+	}
+	configBytes := config.Bytes()
+
+	return crypto.Keccak256Hash(
+		notarySetBytes[:],
+		configBytes[:],
+		snapshotHash[:],
+		prevHash[:],
+	)
+}
+
+// VerifyBlock verifies the signature of types.Block.
+func VerifyBlock(b *types.Block) (err error) {
+	hash, err := hashBlock(b)
+	if err != nil {
+		return
+	}
+	if hash != b.Hash {
+		err = ErrIncorrectHash
+		return
+	}
+	pubKey, err := crypto.SigToPub(b.Hash, b.Signature)
+	if err != nil {
+		return
+	}
+	if !b.ProposerID.Equal(types.NewNodeID(pubKey)) {
+		err = ErrIncorrectSignature
+		return
+	}
+	return
+}
+
+// DiffUint64 calculates difference between two uint64.
+func DiffUint64(a, b uint64) uint64 {
+	if a > b {
+		return a - b
+	}
+	return b - a
+}
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 2327fde9d..a5b6e6a60 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -103,52 +103,52 @@
 			"versionExact": "dev"
 		},
 		{
-			"checksumSHA1": "IKOLx0ZjJoT9x9zO/bVAXWcNXs8=",
-			"path": "github.com/dexon-foundation/dexon-consensus-core/common",
-			"revision": "43478a2941253a52d133d09f343993000de97f10",
-			"revisionTime": "2018-11-02T02:40:29Z"
+			"checksumSHA1": "ev84RyegNbt2Pr/sK26LK9LoQNI=",
+			"path": "github.com/dexon-foundation/dexon-consensus/common",
+			"revision": "f521279b0d3d33e072d0dc439288fa16cbbf34d3",
+			"revisionTime": "2018-11-02T03:41:28Z"
 		},
 		{
-			"checksumSHA1": "qoTVvVjAMDuWlidSoq2fWKYLEus=",
-			"path": "github.com/dexon-foundation/dexon-consensus-core/core",
-			"revision": "43478a2941253a52d133d09f343993000de97f10",
-			"revisionTime": "2018-11-02T02:40:29Z"
+			"checksumSHA1": "O/LHWlFbdYp+dJDcuUHjIiBGyK4=",
+			"path": "github.com/dexon-foundation/dexon-consensus/core",
+			"revision": "f521279b0d3d33e072d0dc439288fa16cbbf34d3",
+			"revisionTime": "2018-11-02T03:41:28Z"
 		},
 		{
-			"checksumSHA1": "69/j3ROwzhdGPWKymJnGjaJ5QzY=",
-			"path": "github.com/dexon-foundation/dexon-consensus-core/core/blockdb",
-			"revision": "43478a2941253a52d133d09f343993000de97f10",
-			"revisionTime": "2018-11-02T02:40:29Z"
+			"checksumSHA1": "vNsaBvsrXJF+W6K5DCLpgy1rUZY=",
+			"path": "github.com/dexon-foundation/dexon-consensus/core/blockdb",
+			"revision": "f521279b0d3d33e072d0dc439288fa16cbbf34d3",
+			"revisionTime": "2018-11-02T03:41:28Z"
 		},
 		{
-			"checksumSHA1": "GXHmtn3UlUftllBXI+M8RBkilzY=",
-			"path": "github.com/dexon-foundation/dexon-consensus-core/core/crypto",
-			"revision": "43478a2941253a52d133d09f343993000de97f10",
-			"revisionTime": "2018-11-02T02:40:29Z"
+			"checksumSHA1": "tQSbYCu5P00lUhKsx3IbBZCuSLY=",
+			"path": "github.com/dexon-foundation/dexon-consensus/core/crypto",
+			"revision": "f521279b0d3d33e072d0dc439288fa16cbbf34d3",
+			"revisionTime": "2018-11-02T03:41:28Z"
 		},
 		{
-			"checksumSHA1": "sh19Kk6G7esEcBPC2QsaFF3V/Ds=",
-			"path": "github.com/dexon-foundation/dexon-consensus-core/core/crypto/dkg",
-			"revision": "43478a2941253a52d133d09f343993000de97f10",
-			"revisionTime": "2018-11-02T02:40:29Z"
+			"checksumSHA1": "p2jOAulavUU2xyj018pYPHlj8XA=",
+			"path": "github.com/dexon-foundation/dexon-consensus/core/crypto/dkg",
+			"revision": "f521279b0d3d33e072d0dc439288fa16cbbf34d3",
+			"revisionTime": "2018-11-02T03:41:28Z"
 		},
 		{
-			"checksumSHA1": "priVCcv7H4LTooiN/1EUu8qFiSs=",
-			"path": "github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa",
-			"revision": "43478a2941253a52d133d09f343993000de97f10",
-			"revisionTime": "2018-11-02T02:40:29Z"
+			"checksumSHA1": "6Pf6caC8LTNCI7IflFmglKYnxYo=",
+			"path": "github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa",
+			"revision": "f521279b0d3d33e072d0dc439288fa16cbbf34d3",
+			"revisionTime": "2018-11-02T03:41:28Z"
 		},
 		{
-			"checksumSHA1": "ZWmUF+3/pobzITsGZSOOtvK1nvs=",
-			"path": "github.com/dexon-foundation/dexon-consensus-core/core/types",
-			"revision": "43478a2941253a52d133d09f343993000de97f10",
-			"revisionTime": "2018-11-02T02:40:29Z"
+			"checksumSHA1": "h7dAzmB5HttApz3pSlgzNP82TqE=",
+			"path": "github.com/dexon-foundation/dexon-consensus/core/types",
+			"revision": "f521279b0d3d33e072d0dc439288fa16cbbf34d3",
+			"revisionTime": "2018-11-02T03:41:28Z"
 		},
 		{
-			"checksumSHA1": "ZOjAnqYE7HayNBTsMIgRQPLxndI=",
-			"path": "github.com/dexon-foundation/dexon-consensus-core/core/types/dkg",
-			"revision": "43478a2941253a52d133d09f343993000de97f10",
-			"revisionTime": "2018-11-02T02:40:29Z"
+			"checksumSHA1": "ovChyW9OfDGnk/7CDAR+A5vJymc=",
+			"path": "github.com/dexon-foundation/dexon-consensus/core/types/dkg",
+			"revision": "f521279b0d3d33e072d0dc439288fa16cbbf34d3",
+			"revisionTime": "2018-11-02T03:41:28Z"
 		},
 		{
 			"checksumSHA1": "TAkwduKZqLyimyTPPWIllZWYFuE=",