1 files changed, 14 insertions, 3 deletions
diff --git a/pow/block.go b/pow/block.go
index 31e194d8d..3bc63978b 100644
--- a/pow/block.go
+++ b/pow/block.go
@@ -1,10 +1,21 @@
 package pow
 
-import "math/big"
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/core/types"
+)
 
 type Block interface {
 	Difficulty() *big.Int
 	HashNoNonce() []byte
-	N() []byte
-	Number() *big.Int
+	Nonce() uint64
+	MixDigest() []byte
+	SeedHash() []byte
+	NumberU64() uint64
+}
+
+type ChainManager interface {
+	GetBlockByNumber(uint64) *types.Block
+	CurrentBlock() *types.Block
 }