Merge pull request #2497 from karalabe/version-contract-3

Geth release oracle

13 files changed, 1407 insertions, 53 deletions

diff --git a/accounts/abi/bind/backend.go b/accounts/abi/bind/backend.go
index 7442557cc..604e1ef26 100644
--- a/accounts/abi/bind/backend.go
+++ b/accounts/abi/bind/backend.go
@@ -47,7 +47,8 @@ type ContractCaller interface {
 // used when the user does not provide some needed values, but rather leaves it up
 // to the transactor to decide.
 type ContractTransactor interface {
-	// Nonce retrieves the current pending nonce associated with an account.
+	// PendingAccountNonce retrieves the current pending nonce associated with an
+	// account.
 	PendingAccountNonce(account common.Address) (uint64, error)
 
 	// SuggestGasPrice retrieves the currently suggested gas price to allow a timely
@@ -62,7 +63,7 @@ type ContractTransactor interface {
 	EstimateGasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error)
 
 	// SendTransaction injects the transaction into the pending pool for execution.
-	SendTransaction(*types.Transaction) error
+	SendTransaction(tx *types.Transaction) error
 }
 
 // ContractBackend defines the methods needed to allow operating with contract
diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index ffeb7c1e5..42ce761d8 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -18,6 +18,7 @@
 package main
 
 import (
+	"encoding/hex"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -41,31 +42,48 @@ import (
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/node"
 	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/release"
 	"github.com/ethereum/go-ethereum/rlp"
 )
 
 const (
-	ClientIdentifier = "Geth"
-	Version          = "1.5.0-unstable"
-	VersionMajor     = 1
-	VersionMinor     = 5
-	VersionPatch     = 0
+	clientIdentifier = "Geth"     // Client identifier to advertise over the network
+	versionMajor     = 1          // Major version component of the current release
+	versionMinor     = 5          // Minor version component of the current release
+	versionPatch     = 0          // Patch version component of the current release
+	versionMeta      = "unstable" // Version metadata to append to the version string
+
+	versionOracle = "0xfa7b9770ca4cb04296cac84f37736d4041251cdf" // Ethereum address of the Geth release oracle
 )
 
 var (
-	gitCommit       string // set via linker flagg
-	nodeNameVersion string
-	app             *cli.App
+	gitCommit string         // Git SHA1 commit hash of the release (set via linker flags)
+	verString string         // Combined textual representation of all the version components
+	relConfig release.Config // Structured version information and release oracle config
+	app       *cli.App
 )
 
 func init() {
-	if gitCommit == "" {
-		nodeNameVersion = Version
-	} else {
-		nodeNameVersion = Version + "-" + gitCommit[:8]
+	// Construct the textual version string from the individual components
+	verString = fmt.Sprintf("%d.%d.%d", versionMajor, versionMinor, versionPatch)
+	if versionMeta != "" {
+		verString += "-" + versionMeta
+	}
+	if gitCommit != "" {
+		verString += "-" + gitCommit[:8]
 	}
+	// Construct the version release oracle configuration
+	relConfig.Oracle = common.HexToAddress(versionOracle)
 
-	app = utils.NewApp(Version, "the go-ethereum command line interface")
+	relConfig.Major = uint32(versionMajor)
+	relConfig.Minor = uint32(versionMinor)
+	relConfig.Patch = uint32(versionPatch)
+
+	commit, _ := hex.DecodeString(gitCommit)
+	copy(relConfig.Commit[:], commit)
+
+	// Initialize the CLI app and start Geth
+	app = utils.NewApp(verString, "the go-ethereum command line interface")
 	app.Action = geth
 	app.HideVersion = true // we have a command to print the version
 	app.Commands = []cli.Command{
@@ -257,7 +275,7 @@ func makeDefaultExtra() []byte {
 		Name      string
 		GoVersion string
 		Os        string
-	}{uint(VersionMajor<<16 | VersionMinor<<8 | VersionPatch), ClientIdentifier, runtime.Version(), runtime.GOOS}
+	}{uint(versionMajor<<16 | versionMinor<<8 | versionPatch), clientIdentifier, runtime.Version(), runtime.GOOS}
 	extra, err := rlp.EncodeToBytes(clientInfo)
 	if err != nil {
 		glog.V(logger.Warn).Infoln("error setting canonical miner information:", err)
@@ -275,7 +293,7 @@ func makeDefaultExtra() []byte {
 // It creates a default node based on the command line arguments and runs it in
 // blocking mode, waiting for it to be shut down.
 func geth(ctx *cli.Context) {
-	node := utils.MakeSystemNode(ClientIdentifier, nodeNameVersion, makeDefaultExtra(), ctx)
+	node := utils.MakeSystemNode(clientIdentifier, verString, relConfig, makeDefaultExtra(), ctx)
 	startNode(ctx, node)
 	node.Wait()
 }
@@ -339,7 +357,7 @@ func initGenesis(ctx *cli.Context) {
 // same time.
 func console(ctx *cli.Context) {
 	// Create and start the node based on the CLI flags
-	node := utils.MakeSystemNode(ClientIdentifier, nodeNameVersion, makeDefaultExtra(), ctx)
+	node := utils.MakeSystemNode(clientIdentifier, verString, relConfig, makeDefaultExtra(), ctx)
 	startNode(ctx, node)
 
 	// Attach to the newly started node, and either execute script or become interactive
@@ -372,7 +390,7 @@ func console(ctx *cli.Context) {
 // of the JavaScript files specified as command arguments.
 func execScripts(ctx *cli.Context) {
 	// Create and start the node based on the CLI flags
-	node := utils.MakeSystemNode(ClientIdentifier, nodeNameVersion, makeDefaultExtra(), ctx)
+	node := utils.MakeSystemNode(clientIdentifier, verString, relConfig, makeDefaultExtra(), ctx)
 	startNode(ctx, node)
 	defer node.Stop()
 
@@ -488,11 +506,8 @@ func gpubench(ctx *cli.Context) {
 }
 
 func version(c *cli.Context) {
-	fmt.Println(ClientIdentifier)
-	fmt.Println("Version:", Version)
-	if gitCommit != "" {
-		fmt.Println("Git Commit:", gitCommit)
-	}
+	fmt.Println(clientIdentifier)
+	fmt.Println("Version:", version)
 	fmt.Println("Protocol Versions:", eth.ProtocolVersions)
 	fmt.Println("Network Id:", c.GlobalInt(utils.NetworkIdFlag.Name))
 	fmt.Println("Go Version:", runtime.Version())
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 8d55ac8b9..43dbc37f7 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -48,6 +48,7 @@ import (
 	"github.com/ethereum/go-ethereum/p2p/nat"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/pow"
+	"github.com/ethereum/go-ethereum/release"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/ethereum/go-ethereum/whisper"
 )
@@ -641,7 +642,7 @@ func MakePasswordList(ctx *cli.Context) []string {
 
 // MakeSystemNode sets up a local node, configures the services to launch and
 // assembles the P2P protocol stack.
-func MakeSystemNode(name, version string, extra []byte, ctx *cli.Context) *node.Node {
+func MakeSystemNode(name, version string, relconf release.Config, extra []byte, ctx *cli.Context) *node.Node {
 	// Avoid conflicting network flags
 	networks, netFlags := 0, []cli.BoolFlag{DevModeFlag, TestNetFlag, OlympicFlag}
 	for _, flag := range netFlags {
@@ -772,7 +773,11 @@ func MakeSystemNode(name, version string, extra []byte, ctx *cli.Context) *node.
 			Fatalf("Failed to register the Whisper service: %v", err)
 		}
 	}
-
+	if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
+		return release.NewReleaseService(ctx, relconf)
+	}); err != nil {
+		Fatalf("Failed to register the Geth release oracle service: %v", err)
+	}
 	return stack
 }
 
diff --git a/eth/api.go b/eth/api.go
index 2c84cf471..bd8179962 100644
--- a/eth/api.go
+++ b/eth/api.go
@@ -52,14 +52,14 @@ import (
 	"golang.org/x/net/context"
 )
 
-// ErrNoCode is returned by call and transact operations for which the requested
+// errNoCode is returned by call and transact operations for which the requested
 // recipient contract to operate on does not exist in the state db or does not
 // have any code associated with it (i.e. suicided).
 //
 // Please note, this error string is part of the RPC API and is expected by the
 // native contract bindings to signal this particular error. Do not change this
 // as it will break all dependent code!
-var ErrNoCode = errors.New("no contract code at given address")
+var errNoCode = errors.New("no contract code at given address")
 
 const defaultGas = uint64(90000)
 
@@ -107,8 +107,11 @@ type PublicEthereumAPI struct {
 }
 
 // NewPublicEthereumAPI creates a new Ethereum protocol API.
-func NewPublicEthereumAPI(e *Ethereum, gpo *GasPriceOracle) *PublicEthereumAPI {
-	return &PublicEthereumAPI{e, gpo}
+func NewPublicEthereumAPI(e *Ethereum) *PublicEthereumAPI {
+	return &PublicEthereumAPI{
+		e:   e,
+		gpo: e.gpo,
+	}
 }
 
 // GasPrice returns a suggestion for a gas price.
@@ -717,7 +720,7 @@ func (s *PublicBlockChainAPI) doCall(args CallArgs, blockNr rpc.BlockNumber) (st
 	// If there's no code to interact with, respond with an appropriate error
 	if args.To != nil {
 		if code := stateDb.GetCode(*args.To); len(code) == 0 {
-			return "0x", nil, ErrNoCode
+			return "0x", nil, errNoCode
 		}
 	}
 	// Retrieve the account state object to interact with
@@ -914,18 +917,17 @@ type PublicTransactionPoolAPI struct {
 }
 
 // NewPublicTransactionPoolAPI creates a new RPC service with methods specific for the transaction pool.
-func NewPublicTransactionPoolAPI(e *Ethereum, gpo *GasPriceOracle) *PublicTransactionPoolAPI {
+func NewPublicTransactionPoolAPI(e *Ethereum) *PublicTransactionPoolAPI {
 	api := &PublicTransactionPoolAPI{
-		eventMux:      e.EventMux(),
-		gpo:           gpo,
-		chainDb:       e.ChainDb(),
-		bc:            e.BlockChain(),
-		am:            e.AccountManager(),
-		txPool:        e.TxPool(),
-		miner:         e.Miner(),
+		eventMux:      e.eventMux,
+		gpo:           e.gpo,
+		chainDb:       e.chainDb,
+		bc:            e.blockchain,
+		am:            e.accountManager,
+		txPool:        e.txPool,
+		miner:         e.miner,
 		pendingTxSubs: make(map[string]rpc.Subscription),
 	}
-
 	go api.subscriptionLoop()
 
 	return api
diff --git a/eth/backend.go b/eth/backend.go
index 76cf8783b..9722e9625 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -119,6 +119,7 @@ type Ethereum struct {
 	protocolManager *ProtocolManager
 	SolcPath        string
 	solc            *compiler.Solidity
+	gpo             *GasPriceOracle
 
 	GpoMinGasPrice          *big.Int
 	GpoMaxGasPrice          *big.Int
@@ -260,6 +261,8 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 		}
 		return nil, err
 	}
+	eth.gpo = NewGasPriceOracle(eth)
+
 	newPool := core.NewTxPool(eth.chainConfig, eth.EventMux(), eth.blockchain.State, eth.blockchain.GasLimit)
 	eth.txPool = newPool
 
@@ -276,34 +279,31 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 // APIs returns the collection of RPC services the ethereum package offers.
 // NOTE, some of these services probably need to be moved to somewhere else.
 func (s *Ethereum) APIs() []rpc.API {
-	// share gas price oracle in API's
-	gpo := NewGasPriceOracle(s)
-
 	return []rpc.API{
 		{
 			Namespace: "eth",
 			Version:   "1.0",
-			Service:   NewPublicEthereumAPI(s, gpo),
+			Service:   NewPublicEthereumAPI(s),
 			Public:    true,
 		}, {
 			Namespace: "eth",
 			Version:   "1.0",
-			Service:   NewPublicAccountAPI(s.AccountManager()),
+			Service:   NewPublicAccountAPI(s.accountManager),
 			Public:    true,
 		}, {
 			Namespace: "personal",
 			Version:   "1.0",
-			Service:   NewPrivateAccountAPI(s.AccountManager()),
+			Service:   NewPrivateAccountAPI(s.accountManager),
 			Public:    false,
 		}, {
 			Namespace: "eth",
 			Version:   "1.0",
-			Service:   NewPublicBlockChainAPI(s.chainConfig, s.BlockChain(), s.Miner(), s.ChainDb(), gpo, s.EventMux(), s.AccountManager()),
+			Service:   NewPublicBlockChainAPI(s.chainConfig, s.blockchain, s.miner, s.chainDb, s.gpo, s.eventMux, s.accountManager),
 			Public:    true,
 		}, {
 			Namespace: "eth",
 			Version:   "1.0",
-			Service:   NewPublicTransactionPoolAPI(s, gpo),
+			Service:   NewPublicTransactionPoolAPI(s),
 			Public:    true,
 		}, {
 			Namespace: "eth",
@@ -313,7 +313,7 @@ func (s *Ethereum) APIs() []rpc.API {
 		}, {
 			Namespace: "eth",
 			Version:   "1.0",
-			Service:   downloader.NewPublicDownloaderAPI(s.Downloader(), s.EventMux()),
+			Service:   downloader.NewPublicDownloaderAPI(s.protocolManager.downloader, s.eventMux),
 			Public:    true,
 		}, {
 			Namespace: "miner",
@@ -328,7 +328,7 @@ func (s *Ethereum) APIs() []rpc.API {
 		}, {
 			Namespace: "eth",
 			Version:   "1.0",
-			Service:   filters.NewPublicFilterAPI(s.ChainDb(), s.EventMux()),
+			Service:   filters.NewPublicFilterAPI(s.chainDb, s.eventMux),
 			Public:    true,
 		}, {
 			Namespace: "admin",
@@ -351,7 +351,7 @@ func (s *Ethereum) APIs() []rpc.API {
 		}, {
 			Namespace: "admin",
 			Version:   "1.0",
-			Service:   ethreg.NewPrivateRegistarAPI(s.chainConfig, s.BlockChain(), s.ChainDb(), s.TxPool(), s.AccountManager()),
+			Service:   ethreg.NewPrivateRegistarAPI(s.chainConfig, s.blockchain, s.chainDb, s.txPool, s.accountManager),
 		},
 	}
 }
diff --git a/eth/bind.go b/eth/bind.go
new file mode 100644
index 000000000..3a3eca062
--- /dev/null
+++ b/eth/bind.go
@@ -0,0 +1,110 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package eth
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/rlp"
+	"github.com/ethereum/go-ethereum/rpc"
+)
+
+// ContractBackend implements bind.ContractBackend with direct calls to Ethereum
+// internals to support operating on contracts within subprotocols like eth and
+// swarm.
+//
+// Internally this backend uses the already exposed API endpoints of the Ethereum
+// object. These should be rewritten to internal Go method calls when the Go API
+// is refactored to support a clean library use.
+type ContractBackend struct {
+	eapi  *PublicEthereumAPI        // Wrapper around the Ethereum object to access metadata
+	bcapi *PublicBlockChainAPI      // Wrapper around the blockchain to access chain data
+	txapi *PublicTransactionPoolAPI // Wrapper around the transaction pool to access transaction data
+}
+
+// NewContractBackend creates a new native contract backend using an existing
+// Etheruem object.
+func NewContractBackend(eth *Ethereum) *ContractBackend {
+	return &ContractBackend{
+		eapi:  NewPublicEthereumAPI(eth),
+		bcapi: NewPublicBlockChainAPI(eth.chainConfig, eth.blockchain, eth.miner, eth.chainDb, eth.gpo, eth.eventMux, eth.accountManager),
+		txapi: NewPublicTransactionPoolAPI(eth),
+	}
+}
+
+// ContractCall implements bind.ContractCaller executing an Ethereum contract
+// call with the specified data as the input. The pending flag requests execution
+// against the pending block, not the stable head of the chain.
+func (b *ContractBackend) ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error) {
+	// Convert the input args to the API spec
+	args := CallArgs{
+		To:   &contract,
+		Data: common.ToHex(data),
+	}
+	block := rpc.LatestBlockNumber
+	if pending {
+		block = rpc.PendingBlockNumber
+	}
+	// Execute the call and convert the output back to Go types
+	out, err := b.bcapi.Call(args, block)
+	if err == errNoCode {
+		err = bind.ErrNoCode
+	}
+	return common.FromHex(out), err
+}
+
+// PendingAccountNonce implements bind.ContractTransactor retrieving the current
+// pending nonce associated with an account.
+func (b *ContractBackend) PendingAccountNonce(account common.Address) (uint64, error) {
+	out, err := b.txapi.GetTransactionCount(account, rpc.PendingBlockNumber)
+	return out.Uint64(), err
+}
+
+// SuggestGasPrice implements bind.ContractTransactor retrieving the currently
+// suggested gas price to allow a timely execution of a transaction.
+func (b *ContractBackend) SuggestGasPrice() (*big.Int, error) {
+	return b.eapi.GasPrice(), nil
+}
+
+// EstimateGasLimit implements bind.ContractTransactor triing to estimate the gas
+// needed to execute a specific transaction based on the current pending state of
+// the backend blockchain. There is no guarantee that this is the true gas limit
+// requirement as other transactions may be added or removed by miners, but it
+// should provide a basis for setting a reasonable default.
+func (b *ContractBackend) EstimateGasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error) {
+	out, err := b.bcapi.EstimateGas(CallArgs{
+		From:  sender,
+		To:    contract,
+		Value: *rpc.NewHexNumber(value),
+		Data:  common.ToHex(data),
+	})
+	if err == errNoCode {
+		err = bind.ErrNoCode
+	}
+	return out.BigInt(), err
+}
+
+// SendTransaction implements bind.ContractTransactor injects the transaction
+// into the pending pool for execution.
+func (b *ContractBackend) SendTransaction(tx *types.Transaction) error {
+	raw, _ := rlp.EncodeToBytes(tx)
+	_, err := b.txapi.SendRawTransaction(common.ToHex(raw))
+	return err
+}
diff --git a/node/node.go b/node/node.go
index 18c3f91d8..06a1b7aed 100644
--- a/node/node.go
+++ b/node/node.go
@@ -311,7 +311,7 @@ func (n *Node) startIPC(apis []rpc.API) error {
 				glog.V(logger.Error).Infof("IPC accept failed: %v", err)
 				continue
 			}
-			go handler.ServeCodec(rpc.NewJSONCodec(conn), rpc.OptionMethodInvocation | rpc.OptionSubscriptions)
+			go handler.ServeCodec(rpc.NewJSONCodec(conn), rpc.OptionMethodInvocation|rpc.OptionSubscriptions)
 		}
 	}()
 	// All listeners booted successfully
diff --git a/node/service.go b/node/service.go
index 77b2ddc92..4d9a6e42c 100644
--- a/node/service.go
+++ b/node/service.go
@@ -68,7 +68,7 @@ type ServiceConstructor func(ctx *ServiceContext) (Service, error)
 //  - Restart logic is not required as the node will create a fresh instance
 //    every time a service is started.
 type Service interface {
-	// Protocol retrieves the P2P protocols the service wishes to start.
+	// Protocols retrieves the P2P protocols the service wishes to start.
 	Protocols() []p2p.Protocol
 
 	// APIs retrieves the list of RPC descriptors the service provides
diff --git a/release/contract.go b/release/contract.go
new file mode 100644
index 000000000..51c1443d4
--- /dev/null
+++ b/release/contract.go
@@ -0,0 +1,432 @@
+// This file is an automatically generated Go binding. Do not modify as any
+// change will likely be lost upon the next re-generation!
+
+package release
+
+import (
+	"math/big"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/accounts/abi"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+// ReleaseOracleABI is the input ABI used to generate the binding from.
+const ReleaseOracleABI = `[{"constant":true,"inputs":[],"name":"currentVersion","outputs":[{"name":"major","type":"uint32"},{"name":"minor","type":"uint32"},{"name":"patch","type":"uint32"},{"name":"commit","type":"bytes20"},{"name":"time","type":"uint256"}],"type":"function"},{"constant":true,"inputs":[],"name":"proposedVersion","outputs":[{"name":"major","type":"uint32"},{"name":"minor","type":"uint32"},{"name":"patch","type":"uint32"},{"name":"commit","type":"bytes20"},{"name":"pass","type":"address[]"},{"name":"fail","type":"address[]"}],"type":"function"},{"constant":true,"inputs":[],"name":"signers","outputs":[{"name":"","type":"address[]"}],"type":"function"},{"constant":true,"inputs":[],"name":"authProposals","outputs":[{"name":"","type":"address[]"}],"type":"function"},{"constant":true,"inputs":[{"name":"user","type":"address"}],"name":"authVotes","outputs":[{"name":"promote","type":"address[]"},{"name":"demote","type":"address[]"}],"type":"function"},{"constant":false,"inputs":[{"name":"user","type":"address"}],"name":"promote","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"user","type":"address"}],"name":"demote","outputs":[],"type":"function"},{"constant":false,"inputs":[{"name":"major","type":"uint32"},{"name":"minor","type":"uint32"},{"name":"patch","type":"uint32"},{"name":"commit","type":"bytes20"}],"name":"release","outputs":[],"type":"function"},{"constant":false,"inputs":[],"name":"nuke","outputs":[],"type":"function"},{"inputs":[{"name":"signers","type":"address[]"}],"type":"constructor"}]`
+
+// ReleaseOracleBin is the compiled bytecode used for deploying new contracts.
+const ReleaseOracleBin = `0x60606040526040516114033803806114038339810160405280510160008151600014156100ce57600160a060020a0333168152602081905260408120805460ff191660019081179091558054808201808355828183801582901161015e5781836000526020600020918201910161015e91905b8082111561019957600081558401610072565b505050919090600052602060002090016000848481518110156100025790602001906020020151909190916101000a815481600160a060020a0302191690830217905550506001015b815181101561018957600160006000506000848481518110156100025790602001906020020151600160a060020a0316815260200190815260200160002060006101000a81548160ff0219169083021790555060016000508054806001018281815481835581811511610085576000839052610085906000805160206113e3833981519152908101908301610072565b5050506000929092526000805160206113e3833981519152018054600160a060020a03191633179055505b50506112458061019e6000396000f35b50905600606060405236156100775760e060020a600035046326db7648811461007957806346f0975a1461019e5780635c3d005d1461020a57806364ed31fe146102935780639d888e861461038d578063bc8fbbf8146103b2578063bf8ecf9c146103fb578063d0e0813a14610467578063d67cbec914610478575b005b610495604080516020818101835260008083528351808301855281815260045460068054875181870281018701909852808852939687968796879691959463ffffffff818116956401000000008304821695604060020a840490921694606060020a938490049093029390926007929184919083018282801561012657602002820191906000526020600020905b8154600160a060020a0316815260019190910190602001808311610107575b505050505091508080548060200260200160405190810160405280929190818152602001828054801561018357602002820191906000526020600020905b8154600160a060020a0316815260019190910190602001808311610164575b50505050509050955095509550955095509550909192939495565b6040805160208181018352600082526001805484518184028101840190955280855261054894928301828280156101ff57602002820191906000526020600020905b8154600160a060020a03168152600191909101906020018083116101e0575b505050505090505b90565b6100776004356106d78160005b600160a060020a033316600090815260208190526040812054819060ff16156106df57600160a060020a038416815260026020526040812091505b81548110156106e7578154600160a060020a033316908390839081101561000257600091825260209091200154600160a060020a03161415610732576106df565b6105926004356040805160208181018352600080835283518083018552818152600160a060020a038616825260028352908490208054855181850281018501909652808652939491939092600184019291849183018282801561032057602002820191906000526020600020905b8154600160a060020a0316815260019190910190602001808311610301575b505050505091508080548060200260200160405190810160405280929190818152602001828054801561037d57602002820191906000526020600020905b8154600160a060020a031681526001919091019060200180831161035e575b5050505050905091509150915091565b6106176000600060006000600060006008600050805490506000141561064e576106cf565b6100776106e56000808080805b600160a060020a033316600090815260208190526040812054819060ff161561121c57821580156103f1575060065481145b15610ca55761121c565b6040805160208181018352600082526003805484518184028101840190955280855261054894928301828280156101ff57602002820191906000526020600020908154600160a060020a03168152600191909101906020018083116101e0575b50505050509050610207565b6100776004356106d7816001610217565b6100776004356024356044356064356106df8484848460016103bf565b604051808763ffffffff1681526020018663ffffffff1681526020018563ffffffff16815260200184815260200180602001806020018381038352858181518152602001915080519060200190602002808383829060006004602084601f0104600f02600301f1509050018381038252848181518152602001915080519060200190602002808383829060006004602084601f0104600f02600301f1509050019850505050505050505060405180910390f35b60405180806020018281038252838181518152602001915080519060200190602002808383829060006004602084601f0104600f02600301f1509050019250505060405180910390f35b6040518080602001806020018381038352858181518152602001915080519060200190602002808383829060006004602084601f0104600f02600301f1509050018381038252848181518152602001915080519060200190602002808383829060006004602084601f0104600f02600301f15090500194505050505060405180910390f35b6040805163ffffffff9687168152948616602086015292909416838301526060830152608082019290925290519081900360a00190f35b600880546000198101908110156100025760009182526004027ff3f7a9fe364faab93b216da50a3214154f22a0a2b415b23a84c8169e8b636ee30190508054600182015463ffffffff8281169950640100000000830481169850604060020a8304169650606060020a91829004909102945067ffffffffffffffff16925090505b509091929394565b50565b505050505b50505050565b565b5060005b600182015481101561073a5733600160a060020a03168260010160005082815481101561000257600091825260209091200154600160a060020a03161415610784576106df565b600101610252565b8154600014801561074f575060018201546000145b156107ac576003805460018101808355828183801582901161078c5781836000526020600020918201910161078c9190610834565b6001016106eb565b5050506000928352506020909120018054600160a060020a031916851790555b821561084c578154600181018084558391908281838015829011610881578183600052602060002091820191016108819190610834565b5050506000928352506020909120018054600160a060020a031916851790555b600160a060020a038416600090815260026020908152604082208054838255818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+
+// DeployReleaseOracle deploys a new Ethereum contract, binding an instance of ReleaseOracle to it.
+func DeployReleaseOracle(auth *bind.TransactOpts, backend bind.ContractBackend, signers []common.Address) (common.Address, *types.Transaction, *ReleaseOracle, error) {
+	parsed, err := abi.JSON(strings.NewReader(ReleaseOracleABI))
+	if err != nil {
+		return common.Address{}, nil, nil, err
+	}
+	address, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex(ReleaseOracleBin), backend, signers)
+	if err != nil {
+		return common.Address{}, nil, nil, err
+	}
+	return address, tx, &ReleaseOracle{ReleaseOracleCaller: ReleaseOracleCaller{contract: contract}, ReleaseOracleTransactor: ReleaseOracleTransactor{contract: contract}}, nil
+}
+
+// ReleaseOracle is an auto generated Go binding around an Ethereum contract.
+type ReleaseOracle struct {
+	ReleaseOracleCaller     // Read-only binding to the contract
+	ReleaseOracleTransactor // Write-only binding to the contract
+}
+
+// ReleaseOracleCaller is an auto generated read-only Go binding around an Ethereum contract.
+type ReleaseOracleCaller struct {
+	contract *bind.BoundContract // Generic contract wrapper for the low level calls
+}
+
+// ReleaseOracleTransactor is an auto generated write-only Go binding around an Ethereum contract.
+type ReleaseOracleTransactor struct {
+	contract *bind.BoundContract // Generic contract wrapper for the low level calls
+}
+
+// ReleaseOracleSession is an auto generated Go binding around an Ethereum contract,
+// with pre-set call and transact options.
+type ReleaseOracleSession struct {
+	Contract     *ReleaseOracle    // Generic contract binding to set the session for
+	CallOpts     bind.CallOpts     // Call options to use throughout this session
+	TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
+}
+
+// ReleaseOracleCallerSession is an auto generated read-only Go binding around an Ethereum contract,
+// with pre-set call options.
+type ReleaseOracleCallerSession struct {
+	Contract *ReleaseOracleCaller // Generic contract caller binding to set the session for
+	CallOpts bind.CallOpts        // Call options to use throughout this session
+}
+
+// ReleaseOracleTransactorSession is an auto generated write-only Go binding around an Ethereum contract,
+// with pre-set transact options.
+type ReleaseOracleTransactorSession struct {
+	Contract     *ReleaseOracleTransactor // Generic contract transactor binding to set the session for
+	TransactOpts bind.TransactOpts        // Transaction auth options to use throughout this session
+}
+
+// ReleaseOracleRaw is an auto generated low-level Go binding around an Ethereum contract.
+type ReleaseOracleRaw struct {
+	Contract *ReleaseOracle // Generic contract binding to access the raw methods on
+}
+
+// ReleaseOracleCallerRaw is an auto generated low-level read-only Go binding around an Ethereum contract.
+type ReleaseOracleCallerRaw struct {
+	Contract *ReleaseOracleCaller // Generic read-only contract binding to access the raw methods on
+}
+
+// ReleaseOracleTransactorRaw is an auto generated low-level write-only Go binding around an Ethereum contract.
+type ReleaseOracleTransactorRaw struct {
+	Contract *ReleaseOracleTransactor // Generic write-only contract binding to access the raw methods on
+}
+
+// NewReleaseOracle creates a new instance of ReleaseOracle, bound to a specific deployed contract.
+func NewReleaseOracle(address common.Address, backend bind.ContractBackend) (*ReleaseOracle, error) {
+	contract, err := bindReleaseOracle(address, backend.(bind.ContractCaller), backend.(bind.ContractTransactor))
+	if err != nil {
+		return nil, err
+	}
+	return &ReleaseOracle{ReleaseOracleCaller: ReleaseOracleCaller{contract: contract}, ReleaseOracleTransactor: ReleaseOracleTransactor{contract: contract}}, nil
+}
+
+// NewReleaseOracleCaller creates a new read-only instance of ReleaseOracle, bound to a specific deployed contract.
+func NewReleaseOracleCaller(address common.Address, caller bind.ContractCaller) (*ReleaseOracleCaller, error) {
+	contract, err := bindReleaseOracle(address, caller, nil)
+	if err != nil {
+		return nil, err
+	}
+	return &ReleaseOracleCaller{contract: contract}, nil
+}
+
+// NewReleaseOracleTransactor creates a new write-only instance of ReleaseOracle, bound to a specific deployed contract.
+func NewReleaseOracleTransactor(address common.Address, transactor bind.ContractTransactor) (*ReleaseOracleTransactor, error) {
+	contract, err := bindReleaseOracle(address, nil, transactor)
+	if err != nil {
+		return nil, err
+	}
+	return &ReleaseOracleTransactor{contract: contract}, nil
+}
+
+// bindReleaseOracle binds a generic wrapper to an already deployed contract.
+func bindReleaseOracle(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor) (*bind.BoundContract, error) {
+	parsed, err := abi.JSON(strings.NewReader(ReleaseOracleABI))
+	if err != nil {
+		return nil, err
+	}
+	return bind.NewBoundContract(address, parsed, caller, transactor), nil
+}
+
+// Call invokes the (constant) contract method with params as input values and
+// sets the output to result. The result type might be a single field for simple
+// returns, a slice of interfaces for anonymous returns and a struct for named
+// returns.
+func (_ReleaseOracle *ReleaseOracleRaw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+	return _ReleaseOracle.Contract.ReleaseOracleCaller.contract.Call(opts, result, method, params...)
+}
+
+// Transfer initiates a plain transaction to move funds to the contract, calling
+// its default method if one is available.
+func (_ReleaseOracle *ReleaseOracleRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.ReleaseOracleTransactor.contract.Transfer(opts)
+}
+
+// Transact invokes the (paid) contract method with params as input values.
+func (_ReleaseOracle *ReleaseOracleRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.ReleaseOracleTransactor.contract.Transact(opts, method, params...)
+}
+
+// Call invokes the (constant) contract method with params as input values and
+// sets the output to result. The result type might be a single field for simple
+// returns, a slice of interfaces for anonymous returns and a struct for named
+// returns.
+func (_ReleaseOracle *ReleaseOracleCallerRaw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+	return _ReleaseOracle.Contract.contract.Call(opts, result, method, params...)
+}
+
+// Transfer initiates a plain transaction to move funds to the contract, calling
+// its default method if one is available.
+func (_ReleaseOracle *ReleaseOracleTransactorRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.contract.Transfer(opts)
+}
+
+// Transact invokes the (paid) contract method with params as input values.
+func (_ReleaseOracle *ReleaseOracleTransactorRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.contract.Transact(opts, method, params...)
+}
+
+// AuthProposals is a free data retrieval call binding the contract method 0xbf8ecf9c.
+//
+// Solidity: function authProposals() constant returns(address[])
+func (_ReleaseOracle *ReleaseOracleCaller) AuthProposals(opts *bind.CallOpts) ([]common.Address, error) {
+	var (
+		ret0 = new([]common.Address)
+	)
+	out := ret0
+	err := _ReleaseOracle.contract.Call(opts, out, "authProposals")
+	return *ret0, err
+}
+
+// AuthProposals is a free data retrieval call binding the contract method 0xbf8ecf9c.
+//
+// Solidity: function authProposals() constant returns(address[])
+func (_ReleaseOracle *ReleaseOracleSession) AuthProposals() ([]common.Address, error) {
+	return _ReleaseOracle.Contract.AuthProposals(&_ReleaseOracle.CallOpts)
+}
+
+// AuthProposals is a free data retrieval call binding the contract method 0xbf8ecf9c.
+//
+// Solidity: function authProposals() constant returns(address[])
+func (_ReleaseOracle *ReleaseOracleCallerSession) AuthProposals() ([]common.Address, error) {
+	return _ReleaseOracle.Contract.AuthProposals(&_ReleaseOracle.CallOpts)
+}
+
+// AuthVotes is a free data retrieval call binding the contract method 0x64ed31fe.
+//
+// Solidity: function authVotes(user address) constant returns(promote address[], demote address[])
+func (_ReleaseOracle *ReleaseOracleCaller) AuthVotes(opts *bind.CallOpts, user common.Address) (struct {
+	Promote []common.Address
+	Demote  []common.Address
+}, error) {
+	ret := new(struct {
+		Promote []common.Address
+		Demote  []common.Address
+	})
+	out := ret
+	err := _ReleaseOracle.contract.Call(opts, out, "authVotes", user)
+	return *ret, err
+}
+
+// AuthVotes is a free data retrieval call binding the contract method 0x64ed31fe.
+//
+// Solidity: function authVotes(user address) constant returns(promote address[], demote address[])
+func (_ReleaseOracle *ReleaseOracleSession) AuthVotes(user common.Address) (struct {
+	Promote []common.Address
+	Demote  []common.Address
+}, error) {
+	return _ReleaseOracle.Contract.AuthVotes(&_ReleaseOracle.CallOpts, user)
+}
+
+// AuthVotes is a free data retrieval call binding the contract method 0x64ed31fe.
+//
+// Solidity: function authVotes(user address) constant returns(promote address[], demote address[])
+func (_ReleaseOracle *ReleaseOracleCallerSession) AuthVotes(user common.Address) (struct {
+	Promote []common.Address
+	Demote  []common.Address
+}, error) {
+	return _ReleaseOracle.Contract.AuthVotes(&_ReleaseOracle.CallOpts, user)
+}
+
+// CurrentVersion is a free data retrieval call binding the contract method 0x9d888e86.
+//
+// Solidity: function currentVersion() constant returns(major uint32, minor uint32, patch uint32, commit bytes20, time uint256)
+func (_ReleaseOracle *ReleaseOracleCaller) CurrentVersion(opts *bind.CallOpts) (struct {
+	Major  uint32
+	Minor  uint32
+	Patch  uint32
+	Commit [20]byte
+	Time   *big.Int
+}, error) {
+	ret := new(struct {
+		Major  uint32
+		Minor  uint32
+		Patch  uint32
+		Commit [20]byte
+		Time   *big.Int
+	})
+	out := ret
+	err := _ReleaseOracle.contract.Call(opts, out, "currentVersion")
+	return *ret, err
+}
+
+// CurrentVersion is a free data retrieval call binding the contract method 0x9d888e86.
+//
+// Solidity: function currentVersion() constant returns(major uint32, minor uint32, patch uint32, commit bytes20, time uint256)
+func (_ReleaseOracle *ReleaseOracleSession) CurrentVersion() (struct {
+	Major  uint32
+	Minor  uint32
+	Patch  uint32
+	Commit [20]byte
+	Time   *big.Int
+}, error) {
+	return _ReleaseOracle.Contract.CurrentVersion(&_ReleaseOracle.CallOpts)
+}
+
+// CurrentVersion is a free data retrieval call binding the contract method 0x9d888e86.
+//
+// Solidity: function currentVersion() constant returns(major uint32, minor uint32, patch uint32, commit bytes20, time uint256)
+func (_ReleaseOracle *ReleaseOracleCallerSession) CurrentVersion() (struct {
+	Major  uint32
+	Minor  uint32
+	Patch  uint32
+	Commit [20]byte
+	Time   *big.Int
+}, error) {
+	return _ReleaseOracle.Contract.CurrentVersion(&_ReleaseOracle.CallOpts)
+}
+
+// ProposedVersion is a free data retrieval call binding the contract method 0x26db7648.
+//
+// Solidity: function proposedVersion() constant returns(major uint32, minor uint32, patch uint32, commit bytes20, pass address[], fail address[])
+func (_ReleaseOracle *ReleaseOracleCaller) ProposedVersion(opts *bind.CallOpts) (struct {
+	Major  uint32
+	Minor  uint32
+	Patch  uint32
+	Commit [20]byte
+	Pass   []common.Address
+	Fail   []common.Address
+}, error) {
+	ret := new(struct {
+		Major  uint32
+		Minor  uint32
+		Patch  uint32
+		Commit [20]byte
+		Pass   []common.Address
+		Fail   []common.Address
+	})
+	out := ret
+	err := _ReleaseOracle.contract.Call(opts, out, "proposedVersion")
+	return *ret, err
+}
+
+// ProposedVersion is a free data retrieval call binding the contract method 0x26db7648.
+//
+// Solidity: function proposedVersion() constant returns(major uint32, minor uint32, patch uint32, commit bytes20, pass address[], fail address[])
+func (_ReleaseOracle *ReleaseOracleSession) ProposedVersion() (struct {
+	Major  uint32
+	Minor  uint32
+	Patch  uint32
+	Commit [20]byte
+	Pass   []common.Address
+	Fail   []common.Address
+}, error) {
+	return _ReleaseOracle.Contract.ProposedVersion(&_ReleaseOracle.CallOpts)
+}
+
+// ProposedVersion is a free data retrieval call binding the contract method 0x26db7648.
+//
+// Solidity: function proposedVersion() constant returns(major uint32, minor uint32, patch uint32, commit bytes20, pass address[], fail address[])
+func (_ReleaseOracle *ReleaseOracleCallerSession) ProposedVersion() (struct {
+	Major  uint32
+	Minor  uint32
+	Patch  uint32
+	Commit [20]byte
+	Pass   []common.Address
+	Fail   []common.Address
+}, error) {
+	return _ReleaseOracle.Contract.ProposedVersion(&_ReleaseOracle.CallOpts)
+}
+
+// Signers is a free data retrieval call binding the contract method 0x46f0975a.
+//
+// Solidity: function signers() constant returns(address[])
+func (_ReleaseOracle *ReleaseOracleCaller) Signers(opts *bind.CallOpts) ([]common.Address, error) {
+	var (
+		ret0 = new([]common.Address)
+	)
+	out := ret0
+	err := _ReleaseOracle.contract.Call(opts, out, "signers")
+	return *ret0, err
+}
+
+// Signers is a free data retrieval call binding the contract method 0x46f0975a.
+//
+// Solidity: function signers() constant returns(address[])
+func (_ReleaseOracle *ReleaseOracleSession) Signers() ([]common.Address, error) {
+	return _ReleaseOracle.Contract.Signers(&_ReleaseOracle.CallOpts)
+}
+
+// Signers is a free data retrieval call binding the contract method 0x46f0975a.
+//
+// Solidity: function signers() constant returns(address[])
+func (_ReleaseOracle *ReleaseOracleCallerSession) Signers() ([]common.Address, error) {
+	return _ReleaseOracle.Contract.Signers(&_ReleaseOracle.CallOpts)
+}
+
+// Demote is a paid mutator transaction binding the contract method 0x5c3d005d.
+//
+// Solidity: function demote(user address) returns()
+func (_ReleaseOracle *ReleaseOracleTransactor) Demote(opts *bind.TransactOpts, user common.Address) (*types.Transaction, error) {
+	return _ReleaseOracle.contract.Transact(opts, "demote", user)
+}
+
+// Demote is a paid mutator transaction binding the contract method 0x5c3d005d.
+//
+// Solidity: function demote(user address) returns()
+func (_ReleaseOracle *ReleaseOracleSession) Demote(user common.Address) (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.Demote(&_ReleaseOracle.TransactOpts, user)
+}
+
+// Demote is a paid mutator transaction binding the contract method 0x5c3d005d.
+//
+// Solidity: function demote(user address) returns()
+func (_ReleaseOracle *ReleaseOracleTransactorSession) Demote(user common.Address) (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.Demote(&_ReleaseOracle.TransactOpts, user)
+}
+
+// Nuke is a paid mutator transaction binding the contract method 0xbc8fbbf8.
+//
+// Solidity: function nuke() returns()
+func (_ReleaseOracle *ReleaseOracleTransactor) Nuke(opts *bind.TransactOpts) (*types.Transaction, error) {
+	return _ReleaseOracle.contract.Transact(opts, "nuke")
+}
+
+// Nuke is a paid mutator transaction binding the contract method 0xbc8fbbf8.
+//
+// Solidity: function nuke() returns()
+func (_ReleaseOracle *ReleaseOracleSession) Nuke() (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.Nuke(&_ReleaseOracle.TransactOpts)
+}
+
+// Nuke is a paid mutator transaction binding the contract method 0xbc8fbbf8.
+//
+// Solidity: function nuke() returns()
+func (_ReleaseOracle *ReleaseOracleTransactorSession) Nuke() (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.Nuke(&_ReleaseOracle.TransactOpts)
+}
+
+// Promote is a paid mutator transaction binding the contract method 0xd0e0813a.
+//
+// Solidity: function promote(user address) returns()
+func (_ReleaseOracle *ReleaseOracleTransactor) Promote(opts *bind.TransactOpts, user common.Address) (*types.Transaction, error) {
+	return _ReleaseOracle.contract.Transact(opts, "promote", user)
+}
+
+// Promote is a paid mutator transaction binding the contract method 0xd0e0813a.
+//
+// Solidity: function promote(user address) returns()
+func (_ReleaseOracle *ReleaseOracleSession) Promote(user common.Address) (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.Promote(&_ReleaseOracle.TransactOpts, user)
+}
+
+// Promote is a paid mutator transaction binding the contract method 0xd0e0813a.
+//
+// Solidity: function promote(user address) returns()
+func (_ReleaseOracle *ReleaseOracleTransactorSession) Promote(user common.Address) (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.Promote(&_ReleaseOracle.TransactOpts, user)
+}
+
+// Release is a paid mutator transaction binding the contract method 0xd67cbec9.
+//
+// Solidity: function release(major uint32, minor uint32, patch uint32, commit bytes20) returns()
+func (_ReleaseOracle *ReleaseOracleTransactor) Release(opts *bind.TransactOpts, major uint32, minor uint32, patch uint32, commit [20]byte) (*types.Transaction, error) {
+	return _ReleaseOracle.contract.Transact(opts, "release", major, minor, patch, commit)
+}
+
+// Release is a paid mutator transaction binding the contract method 0xd67cbec9.
+//
+// Solidity: function release(major uint32, minor uint32, patch uint32, commit bytes20) returns()
+func (_ReleaseOracle *ReleaseOracleSession) Release(major uint32, minor uint32, patch uint32, commit [20]byte) (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.Release(&_ReleaseOracle.TransactOpts, major, minor, patch, commit)
+}
+
+// Release is a paid mutator transaction binding the contract method 0xd67cbec9.
+//
+// Solidity: function release(major uint32, minor uint32, patch uint32, commit bytes20) returns()
+func (_ReleaseOracle *ReleaseOracleTransactorSession) Release(major uint32, minor uint32, patch uint32, commit [20]byte) (*types.Transaction, error) {
+	return _ReleaseOracle.Contract.Release(&_ReleaseOracle.TransactOpts, major, minor, patch, commit)
+}
diff --git a/release/contract.sol b/release/contract.sol
new file mode 100644
index 000000000..fedf646c0
--- /dev/null
+++ b/release/contract.sol
@@ -0,0 +1,249 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// ReleaseOracle is an Ethereum contract to store the current and previous
+// versions of the go-ethereum implementation. Its goal is to allow Geth to
+// check for new releases automatically without the need to consult a central
+// repository.
+//
+// The contract takes a vote based approach on both assigning authorised signers
+// as well as signing off on new Geth releases.
+//
+// Note, when a signer is demoted, the currently pending release is auto-nuked.
+// The reason is to prevent suprises where a demotion actually tilts the votes
+// in favor of one voter party and pushing out a new release as a consequence of
+// a simple demotion.
+contract ReleaseOracle {
+  // Votes is an internal data structure to count votes on a specific proposal
+  struct Votes {
+    address[] pass; // List of signers voting to pass a proposal
+    address[] fail; // List of signers voting to fail a proposal
+  }
+
+  // Version is the version details of a particular Geth release
+  struct Version {
+    uint32  major;  // Major version component of the release
+    uint32  minor;  // Minor version component of the release
+    uint32  patch;  // Patch version component of the release
+    bytes20 commit; // Git SHA1 commit hash of the release
+
+    uint64  time;  // Timestamp of the release approval
+    Votes   votes; // Votes that passed this release
+  }
+
+  // Oracle authorization details
+  mapping(address => bool) authorised; // Set of accounts allowed to vote on updating the contract
+  address[]                voters;     // List of addresses currently accepted as signers
+
+  // Various proposals being voted on
+  mapping(address => Votes) authProps; // Currently running user authorization proposals
+  address[]                 authPend;  // List of addresses being voted on (map indexes)
+
+  Version   verProp;  // Currently proposed release being voted on
+  Version[] releases; // All the positively voted releases
+
+  // isSigner is a modifier to authorize contract transactions.
+  modifier isSigner() {
+    if (authorised[msg.sender]) {
+      _
+    }
+  }
+
+  // Constructor to assign the initial set of signers.
+  function ReleaseOracle(address[] signers) {
+    // If no signers were specified, assign the creator as the sole signer
+    if (signers.length == 0) {
+      authorised[msg.sender] = true;
+      voters.push(msg.sender);
+      return;
+    }
+    // Otherwise assign the individual signers one by one
+    for (uint i = 0; i < signers.length; i++) {
+      authorised[signers[i]] = true;
+      voters.push(signers[i]);
+    }
+  }
+
+  // signers is an accessor method to retrieve all te signers (public accessor
+  // generates an indexed one, not a retreive-all version).
+  function signers() constant returns(address[]) {
+    return voters;
+  }
+
+  // authProposals retrieves the list of addresses that authorization proposals
+  // are currently being voted on.
+  function authProposals() constant returns(address[]) {
+    return authPend;
+  }
+
+  // authVotes retrieves the current authorization votes for a particular user
+  // to promote him into the list of signers, or demote him from there.
+  function authVotes(address user) constant returns(address[] promote, address[] demote) {
+    return (authProps[user].pass, authProps[user].fail);
+  }
+
+  // currentVersion retrieves the semantic version, commit hash and release time
+  // of the currently votec active release.
+  function currentVersion() constant returns (uint32 major, uint32 minor, uint32 patch, bytes20 commit, uint time) {
+    if (releases.length == 0) {
+      return (0, 0, 0, 0, 0);
+    }
+    var release = releases[releases.length - 1];
+
+    return (release.major, release.minor, release.patch, release.commit, release.time);
+  }
+
+  // proposedVersion retrieves the semantic version, commit hash and the current
+  // votes for the next proposed release.
+  function proposedVersion() constant returns (uint32 major, uint32 minor, uint32 patch, bytes20 commit, address[] pass, address[] fail) {
+    return (verProp.major, verProp.minor, verProp.patch, verProp.commit, verProp.votes.pass, verProp.votes.fail);
+  }
+
+  // promote pitches in on a voting campaign to promote a new user to a signer
+  // position.
+  function promote(address user) {
+    updateSigner(user, true);
+  }
+
+  // demote pitches in on a voting campaign to demote an authorised user from
+  // its signer position.
+  function demote(address user) {
+    updateSigner(user, false);
+  }
+
+  // release votes for a particular version to be included as the next release.
+  function release(uint32 major, uint32 minor, uint32 patch, bytes20 commit) {
+    updateRelease(major, minor, patch, commit, true);
+  }
+
+  // nuke votes for the currently proposed version to not be included as the next
+  // release. Nuking doesn't require a specific version number for simplicity.
+  function nuke() {
+    updateRelease(0, 0, 0, 0, false);
+  }
+
+  // updateSigner marks a vote for changing the status of an Ethereum user, either
+  // for or against the user being an authorised signer.
+  function updateSigner(address user, bool authorize) internal isSigner {
+    // Gather the current votes and ensure we don't double vote
+    Votes votes = authProps[user];
+    for (uint i = 0; i < votes.pass.length; i++) {
+      if (votes.pass[i] == msg.sender) {
+        return;
+      }
+    }
+    for (i = 0; i < votes.fail.length; i++) {
+      if (votes.fail[i] == msg.sender) {
+        return;
+      }
+    }
+    // If no authorization proposal is open, add the user to the index for later lookups
+    if (votes.pass.length == 0 && votes.fail.length == 0) {
+      authPend.push(user);
+    }
+    // Cast the vote and return if the proposal cannot be resolved yet
+    if (authorize) {
+      votes.pass.push(msg.sender);
+      if (votes.pass.length <= voters.length / 2) {
+        return;
+      }
+    } else {
+      votes.fail.push(msg.sender);
+      if (votes.fail.length <= voters.length / 2) {
+        return;
+      }
+    }
+    // Proposal resolved in our favor, execute whatever we voted on
+    if (authorize && !authorised[user]) {
+      authorised[user] = true;
+      voters.push(user);
+    } else if (!authorize && authorised[user]) {
+      authorised[user] = false;
+
+      for (i = 0; i < voters.length; i++) {
+        if (voters[i] == user) {
+          voters[i] = voters[voters.length - 1];
+          voters.length--;
+
+          delete verProp; // Nuke any version proposal (no suprise releases!)
+          break;
+        }
+      }
+    }
+    // Finally delete the resolved proposal, index and garbage collect
+    delete authProps[user];
+
+    for (i = 0; i < authPend.length; i++) {
+      if (authPend[i] == user) {
+        authPend[i] = authPend[authPend.length - 1];
+        authPend.length--;
+        break;
+      }
+    }
+  }
+
+  // updateRelease votes for a particular version to be included as the next release,
+  // or for the currently proposed release to be nuked out.
+  function updateRelease(uint32 major, uint32 minor, uint32 patch, bytes20 commit, bool release) internal isSigner {
+    // Skip nuke votes if no proposal is pending
+    if (!release && verProp.votes.pass.length == 0) {
+      return;
+    }
+    // Mark a new release if no proposal is pending
+    if (verProp.votes.pass.length == 0) {
+      verProp.major  = major;
+      verProp.minor  = minor;
+      verProp.patch  = patch;
+      verProp.commit = commit;
+    }
+    // Make sure positive votes match the current proposal
+    if (release && (verProp.major != major || verProp.minor != minor || verProp.patch != patch || verProp.commit != commit)) {
+      return;
+    }
+    // Gather the current votes and ensure we don't double vote
+    Votes votes = verProp.votes;
+    for (uint i = 0; i < votes.pass.length; i++) {
+      if (votes.pass[i] == msg.sender) {
+        return;
+      }
+    }
+    for (i = 0; i < votes.fail.length; i++) {
+      if (votes.fail[i] == msg.sender) {
+        return;
+      }
+    }
+    // Cast the vote and return if the proposal cannot be resolved yet
+    if (release) {
+      votes.pass.push(msg.sender);
+      if (votes.pass.length <= voters.length / 2) {
+        return;
+      }
+    } else {
+      votes.fail.push(msg.sender);
+      if (votes.fail.length <= voters.length / 2) {
+        return;
+      }
+    }
+    // Proposal resolved in our favor, execute whatever we voted on
+    if (release) {
+      verProp.time = uint64(now);
+      releases.push(verProp);
+      delete verProp;
+    } else {
+      delete verProp;
+    }
+  }
+}
diff --git a/release/contract_test.go b/release/contract_test.go
new file mode 100644
index 000000000..11a039992
--- /dev/null
+++ b/release/contract_test.go
@@ -0,0 +1,374 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package release
+
+import (
+	"crypto/ecdsa"
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+// setupReleaseTest creates a blockchain simulator and deploys a version oracle
+// contract for testing.
+func setupReleaseTest(t *testing.T, prefund ...*ecdsa.PrivateKey) (*ecdsa.PrivateKey, *ReleaseOracle, *backends.SimulatedBackend) {
+	// Generate a new random account and a funded simulator
+	key, _ := crypto.GenerateKey()
+	auth := bind.NewKeyedTransactor(key)
+
+	accounts := []core.GenesisAccount{{Address: auth.From, Balance: big.NewInt(10000000000)}}
+	for _, key := range prefund {
+		accounts = append(accounts, core.GenesisAccount{Address: crypto.PubkeyToAddress(key.PublicKey), Balance: big.NewInt(10000000000)})
+	}
+	sim := backends.NewSimulatedBackend(accounts...)
+
+	// Deploy a version oracle contract, commit and return
+	_, _, oracle, err := DeployReleaseOracle(auth, sim, []common.Address{auth.From})
+	if err != nil {
+		t.Fatalf("Failed to deploy version contract: %v", err)
+	}
+	sim.Commit()
+
+	return key, oracle, sim
+}
+
+// Tests that the version contract can be deployed and the creator is assigned
+// the sole authorized signer.
+func TestContractCreation(t *testing.T) {
+	key, oracle, _ := setupReleaseTest(t)
+
+	owner := crypto.PubkeyToAddress(key.PublicKey)
+	signers, err := oracle.Signers(nil)
+	if err != nil {
+		t.Fatalf("Failed to retrieve list of signers: %v", err)
+	}
+	if len(signers) != 1 || signers[0] != owner {
+		t.Fatalf("Initial signer mismatch: have %v, want %v", signers, owner)
+	}
+}
+
+// Tests that subsequent signers can be promoted, each requiring half plus one
+// votes for it to pass through.
+func TestSignerPromotion(t *testing.T) {
+	// Prefund a few accounts to authorize with and create the oracle
+	keys := make([]*ecdsa.PrivateKey, 5)
+	for i := 0; i < len(keys); i++ {
+		keys[i], _ = crypto.GenerateKey()
+	}
+	key, oracle, sim := setupReleaseTest(t, keys...)
+
+	// Gradually promote the keys, until all are authorized
+	keys = append([]*ecdsa.PrivateKey{key}, keys...)
+	for i := 1; i < len(keys); i++ {
+		// Check that no votes are accepted from the not yet authed user
+		if _, err := oracle.Promote(bind.NewKeyedTransactor(keys[i]), common.Address{}); err != nil {
+			t.Fatalf("Iter #%d: failed invalid promotion attempt: %v", i, err)
+		}
+		sim.Commit()
+
+		pend, err := oracle.AuthProposals(nil)
+		if err != nil {
+			t.Fatalf("Iter #%d: failed to retrieve active proposals: %v", i, err)
+		}
+		if len(pend) != 0 {
+			t.Fatalf("Iter #%d: proposal count mismatch: have %d, want 0", i, len(pend))
+		}
+		// Promote with half - 1 voters and check that the user's not yet authorized
+		for j := 0; j < i/2; j++ {
+			if _, err = oracle.Promote(bind.NewKeyedTransactor(keys[j]), crypto.PubkeyToAddress(keys[i].PublicKey)); err != nil {
+				t.Fatalf("Iter #%d: failed valid promotion attempt: %v", i, err)
+			}
+		}
+		sim.Commit()
+
+		signers, err := oracle.Signers(nil)
+		if err != nil {
+			t.Fatalf("Iter #%d: failed to retrieve list of signers: %v", i, err)
+		}
+		if len(signers) != i {
+			t.Fatalf("Iter #%d: signer count mismatch: have %v, want %v", i, len(signers), i)
+		}
+		// Promote with the last one needed to pass the promotion
+		if _, err = oracle.Promote(bind.NewKeyedTransactor(keys[i/2]), crypto.PubkeyToAddress(keys[i].PublicKey)); err != nil {
+			t.Fatalf("Iter #%d: failed valid promotion completion attempt: %v", i, err)
+		}
+		sim.Commit()
+
+		signers, err = oracle.Signers(nil)
+		if err != nil {
+			t.Fatalf("Iter #%d: failed to retrieve list of signers: %v", i, err)
+		}
+		if len(signers) != i+1 {
+			t.Fatalf("Iter #%d: signer count mismatch: have %v, want %v", i, len(signers), i+1)
+		}
+	}
+}
+
+// Tests that subsequent signers can be demoted, each requiring half plus one
+// votes for it to pass through.
+func TestSignerDemotion(t *testing.T) {
+	// Prefund a few accounts to authorize with and create the oracle
+	keys := make([]*ecdsa.PrivateKey, 5)
+	for i := 0; i < len(keys); i++ {
+		keys[i], _ = crypto.GenerateKey()
+	}
+	key, oracle, sim := setupReleaseTest(t, keys...)
+
+	// Authorize all the keys as valid signers and verify cardinality
+	keys = append([]*ecdsa.PrivateKey{key}, keys...)
+	for i := 1; i < len(keys); i++ {
+		for j := 0; j <= i/2; j++ {
+			if _, err := oracle.Promote(bind.NewKeyedTransactor(keys[j]), crypto.PubkeyToAddress(keys[i].PublicKey)); err != nil {
+				t.Fatalf("Iter #%d: failed valid promotion attempt: %v", i, err)
+			}
+		}
+		sim.Commit()
+	}
+	signers, err := oracle.Signers(nil)
+	if err != nil {
+		t.Fatalf("Failed to retrieve list of signers: %v", err)
+	}
+	if len(signers) != len(keys) {
+		t.Fatalf("Signer count mismatch: have %v, want %v", len(signers), len(keys))
+	}
+	// Gradually demote users until we run out of signers
+	for i := len(keys) - 1; i >= 0; i-- {
+		// Demote with half - 1 voters and check that the user's not yet dropped
+		for j := 0; j < (i+1)/2; j++ {
+			if _, err = oracle.Demote(bind.NewKeyedTransactor(keys[j]), crypto.PubkeyToAddress(keys[i].PublicKey)); err != nil {
+				t.Fatalf("Iter #%d: failed valid demotion attempt: %v", len(keys)-i, err)
+			}
+		}
+		sim.Commit()
+
+		signers, err := oracle.Signers(nil)
+		if err != nil {
+			t.Fatalf("Iter #%d: failed to retrieve list of signers: %v", len(keys)-i, err)
+		}
+		if len(signers) != i+1 {
+			t.Fatalf("Iter #%d: signer count mismatch: have %v, want %v", len(keys)-i, len(signers), i+1)
+		}
+		// Demote with the last one needed to pass the demotion
+		if _, err = oracle.Demote(bind.NewKeyedTransactor(keys[(i+1)/2]), crypto.PubkeyToAddress(keys[i].PublicKey)); err != nil {
+			t.Fatalf("Iter #%d: failed valid demotion completion attempt: %v", i, err)
+		}
+		sim.Commit()
+
+		signers, err = oracle.Signers(nil)
+		if err != nil {
+			t.Fatalf("Iter #%d: failed to retrieve list of signers: %v", len(keys)-i, err)
+		}
+		if len(signers) != i {
+			t.Fatalf("Iter #%d: signer count mismatch: have %v, want %v", len(keys)-i, len(signers), i)
+		}
+		// Check that no votes are accepted from the already demoted users
+		if _, err = oracle.Promote(bind.NewKeyedTransactor(keys[i]), common.Address{}); err != nil {
+			t.Fatalf("Iter #%d: failed invalid promotion attempt: %v", i, err)
+		}
+		sim.Commit()
+
+		pend, err := oracle.AuthProposals(nil)
+		if err != nil {
+			t.Fatalf("Iter #%d: failed to retrieve active proposals: %v", i, err)
+		}
+		if len(pend) != 0 {
+			t.Fatalf("Iter #%d: proposal count mismatch: have %d, want 0", i, len(pend))
+		}
+	}
+}
+
+// Tests that new versions can be released, honouring both voting rights as well
+// as the minimum required vote count.
+func TestVersionRelease(t *testing.T) {
+	// Prefund a few accounts to authorize with and create the oracle
+	keys := make([]*ecdsa.PrivateKey, 5)
+	for i := 0; i < len(keys); i++ {
+		keys[i], _ = crypto.GenerateKey()
+	}
+	key, oracle, sim := setupReleaseTest(t, keys...)
+
+	// Track the "current release"
+	var (
+		verMajor  = uint32(0)
+		verMinor  = uint32(0)
+		verPatch  = uint32(0)
+		verCommit = [20]byte{}
+	)
+	// Gradually push releases, always requiring more signers than previously
+	keys = append([]*ecdsa.PrivateKey{key}, keys...)
+	for i := 1; i < len(keys); i++ {
+		// Check that no votes are accepted from the not yet authed user
+		if _, err := oracle.Release(bind.NewKeyedTransactor(keys[i]), 0, 0, 0, [20]byte{0}); err != nil {
+			t.Fatalf("Iter #%d: failed invalid release attempt: %v", i, err)
+		}
+		sim.Commit()
+
+		prop, err := oracle.ProposedVersion(nil)
+		if err != nil {
+			t.Fatalf("Iter #%d: failed to retrieve active proposal: %v", i, err)
+		}
+		if len(prop.Pass) != 0 {
+			t.Fatalf("Iter #%d: proposal vote count mismatch: have %d, want 0", i, len(prop.Pass))
+		}
+		// Authorize the user to make releases
+		for j := 0; j <= i/2; j++ {
+			if _, err = oracle.Promote(bind.NewKeyedTransactor(keys[j]), crypto.PubkeyToAddress(keys[i].PublicKey)); err != nil {
+				t.Fatalf("Iter #%d: failed valid promotion attempt: %v", i, err)
+			}
+		}
+		sim.Commit()
+
+		// Propose release with half voters and check that the release does not yet go through
+		for j := 0; j < (i+1)/2; j++ {
+			if _, err = oracle.Release(bind.NewKeyedTransactor(keys[j]), uint32(i), uint32(i+1), uint32(i+2), [20]byte{byte(i + 3)}); err != nil {
+				t.Fatalf("Iter #%d: failed valid release attempt: %v", i, err)
+			}
+		}
+		sim.Commit()
+
+		ver, err := oracle.CurrentVersion(nil)
+		if err != nil {
+			t.Fatalf("Iter #%d: failed to retrieve current version: %v", i, err)
+		}
+		if ver.Major != verMajor || ver.Minor != verMinor || ver.Patch != verPatch || ver.Commit != verCommit {
+			t.Fatalf("Iter #%d: version mismatch: have %d.%d.%d-%x, want %d.%d.%d-%x", i, ver.Major, ver.Minor, ver.Patch, ver.Commit, verMajor, verMinor, verPatch, verCommit)
+		}
+
+		// Pass the release and check that it became the next version
+		verMajor, verMinor, verPatch, verCommit = uint32(i), uint32(i+1), uint32(i+2), [20]byte{byte(i + 3)}
+		if _, err = oracle.Release(bind.NewKeyedTransactor(keys[(i+1)/2]), uint32(i), uint32(i+1), uint32(i+2), [20]byte{byte(i + 3)}); err != nil {
+			t.Fatalf("Iter #%d: failed valid release completion attempt: %v", i, err)
+		}
+		sim.Commit()
+
+		ver, err = oracle.CurrentVersion(nil)
+		if err != nil {
+			t.Fatalf("Iter #%d: failed to retrieve current version: %v", i, err)
+		}
+		if ver.Major != verMajor || ver.Minor != verMinor || ver.Patch != verPatch || ver.Commit != verCommit {
+			t.Fatalf("Iter #%d: version mismatch: have %d.%d.%d-%x, want %d.%d.%d-%x", i, ver.Major, ver.Minor, ver.Patch, ver.Commit, verMajor, verMinor, verPatch, verCommit)
+		}
+	}
+}
+
+// Tests that proposed versions can be nuked out of existence.
+func TestVersionNuking(t *testing.T) {
+	// Prefund a few accounts to authorize with and create the oracle
+	keys := make([]*ecdsa.PrivateKey, 9)
+	for i := 0; i < len(keys); i++ {
+		keys[i], _ = crypto.GenerateKey()
+	}
+	key, oracle, sim := setupReleaseTest(t, keys...)
+
+	// Authorize all the keys as valid signers
+	keys = append([]*ecdsa.PrivateKey{key}, keys...)
+	for i := 1; i < len(keys); i++ {
+		for j := 0; j <= i/2; j++ {
+			if _, err := oracle.Promote(bind.NewKeyedTransactor(keys[j]), crypto.PubkeyToAddress(keys[i].PublicKey)); err != nil {
+				t.Fatalf("Iter #%d: failed valid promotion attempt: %v", i, err)
+			}
+		}
+		sim.Commit()
+	}
+	// Propose releases with more and more keys, always retaining enough users to nuke the proposals
+	for i := 1; i < (len(keys)+1)/2; i++ {
+		// Propose release with an initial set of signers
+		for j := 0; j < i; j++ {
+			if _, err := oracle.Release(bind.NewKeyedTransactor(keys[j]), uint32(i), uint32(i+1), uint32(i+2), [20]byte{byte(i + 3)}); err != nil {
+				t.Fatalf("Iter #%d: failed valid proposal attempt: %v", i, err)
+			}
+		}
+		sim.Commit()
+
+		prop, err := oracle.ProposedVersion(nil)
+		if err != nil {
+			t.Fatalf("Iter #%d: failed to retrieve active proposal: %v", i, err)
+		}
+		if len(prop.Pass) != i {
+			t.Fatalf("Iter #%d: proposal vote count mismatch: have %d, want %d", i, len(prop.Pass), i)
+		}
+		// Nuke the release with half+1 voters
+		for j := i; j <= i+(len(keys)+1)/2; j++ {
+			if _, err := oracle.Nuke(bind.NewKeyedTransactor(keys[j])); err != nil {
+				t.Fatalf("Iter #%d: failed valid nuke attempt: %v", i, err)
+			}
+		}
+		sim.Commit()
+
+		prop, err = oracle.ProposedVersion(nil)
+		if err != nil {
+			t.Fatalf("Iter #%d: failed to retrieve active proposal: %v", i, err)
+		}
+		if len(prop.Pass) != 0 || len(prop.Fail) != 0 {
+			t.Fatalf("Iter #%d: proposal vote count mismatch: have %d/%d pass/fail, want 0/0", i, len(prop.Pass), len(prop.Fail))
+		}
+	}
+}
+
+// Tests that demoting a signer will auto-nuke the currently pending release.
+func TestVersionAutoNuke(t *testing.T) {
+	// Prefund a few accounts to authorize with and create the oracle
+	keys := make([]*ecdsa.PrivateKey, 5)
+	for i := 0; i < len(keys); i++ {
+		keys[i], _ = crypto.GenerateKey()
+	}
+	key, oracle, sim := setupReleaseTest(t, keys...)
+
+	// Authorize all the keys as valid signers
+	keys = append([]*ecdsa.PrivateKey{key}, keys...)
+	for i := 1; i < len(keys); i++ {
+		for j := 0; j <= i/2; j++ {
+			if _, err := oracle.Promote(bind.NewKeyedTransactor(keys[j]), crypto.PubkeyToAddress(keys[i].PublicKey)); err != nil {
+				t.Fatalf("Iter #%d: failed valid promotion attempt: %v", i, err)
+			}
+		}
+		sim.Commit()
+	}
+	// Make a release proposal and check it's existence
+	if _, err := oracle.Release(bind.NewKeyedTransactor(keys[0]), 1, 2, 3, [20]byte{4}); err != nil {
+		t.Fatalf("Failed valid proposal attempt: %v", err)
+	}
+	sim.Commit()
+
+	prop, err := oracle.ProposedVersion(nil)
+	if err != nil {
+		t.Fatalf("Failed to retrieve active proposal: %v", err)
+	}
+	if len(prop.Pass) != 1 {
+		t.Fatalf("Proposal vote count mismatch: have %d, want 1", len(prop.Pass))
+	}
+	// Demote a signer and check release proposal deletion
+	for i := 0; i <= len(keys)/2; i++ {
+		if _, err := oracle.Demote(bind.NewKeyedTransactor(keys[i]), crypto.PubkeyToAddress(keys[len(keys)-1].PublicKey)); err != nil {
+			t.Fatalf("Iter #%d: failed valid demotion attempt: %v", i, err)
+		}
+	}
+	sim.Commit()
+
+	prop, err = oracle.ProposedVersion(nil)
+	if err != nil {
+		t.Fatalf("Failed to retrieve active proposal: %v", err)
+	}
+	if len(prop.Pass) != 0 {
+		t.Fatalf("Proposal vote count mismatch: have %d, want 0", len(prop.Pass))
+	}
+}
diff --git a/release/generator.go b/release/generator.go
new file mode 100644
index 000000000..1553e0612
--- /dev/null
+++ b/release/generator.go
@@ -0,0 +1,19 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+//go:generate abigen --sol ./contract.sol --pkg release --out ./contract.go
+
+package release
diff --git a/release/release.go b/release/release.go
new file mode 100644
index 000000000..05b4885b5
--- /dev/null
+++ b/release/release.go
@@ -0,0 +1,147 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Package release contains the node service that tracks client releases.
+package release
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/eth"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/node"
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/rpc"
+)
+
+// Interval to check for new releases
+const releaseRecheckInterval = time.Hour
+
+// Config contains the configurations of the release service.
+type Config struct {
+	Oracle common.Address // Ethereum address of the release oracle
+	Major  uint32         // Major version component of the release
+	Minor  uint32         // Minor version component of the release
+	Patch  uint32         // Patch version component of the release
+	Commit [20]byte       // Git SHA1 commit hash of the release
+}
+
+// ReleaseService is a node service that periodically checks the blockchain for
+// newly released versions of the client being run and issues a warning to the
+// user about it.
+type ReleaseService struct {
+	config Config          // Current version to check releases against
+	oracle *ReleaseOracle  // Native binding to the release oracle contract
+	quit   chan chan error // Quit channel to terminate the version checker
+}
+
+// NewReleaseService creates a new service to periodically check for new client
+// releases and notify the user of such.
+func NewReleaseService(ctx *node.ServiceContext, config Config) (node.Service, error) {
+	// Retrieve the Ethereum service dependency to access the blockchain
+	var ethereum *eth.Ethereum
+	if err := ctx.Service(&ethereum); err != nil {
+		return nil, err
+	}
+	// Construct the release service
+	contract, err := NewReleaseOracle(config.Oracle, eth.NewContractBackend(ethereum))
+	if err != nil {
+		return nil, err
+	}
+	return &ReleaseService{
+		config: config,
+		oracle: contract,
+		quit:   make(chan chan error),
+	}, nil
+}
+
+// Protocols returns an empty list of P2P protocols as the release service does
+// not have a networking component.
+func (r *ReleaseService) Protocols() []p2p.Protocol { return nil }
+
+// APIs returns an empty list of RPC descriptors as the release service does not
+// expose any functioanlity to the outside world.
+func (r *ReleaseService) APIs() []rpc.API { return nil }
+
+// Start spawns the periodic version checker goroutine
+func (r *ReleaseService) Start(server *p2p.Server) error {
+	go r.checker()
+	return nil
+}
+
+// Stop terminates all goroutines belonging to the service, blocking until they
+// are all terminated.
+func (r *ReleaseService) Stop() error {
+	errc := make(chan error)
+	r.quit <- errc
+	return <-errc
+}
+
+// checker runs indefinitely in the background, periodically checking for new
+// client releases.
+func (r *ReleaseService) checker() {
+	// Set up the timers to periodically check for releases
+	timer := time.NewTimer(0) // Immediately fire a version check
+	defer timer.Stop()
+
+	for {
+		select {
+		// If the time arrived, check for a new release
+		case <-timer.C:
+			// Rechedule the timer before continuing
+			timer.Reset(releaseRecheckInterval)
+
+			// Retrieve the current version, and handle missing contracts gracefully
+			version, err := r.oracle.CurrentVersion(nil)
+			if err != nil {
+				if err == bind.ErrNoCode {
+					glog.V(logger.Debug).Infof("Release oracle not found at %x", r.config.Oracle)
+					continue
+				}
+				glog.V(logger.Error).Infof("Failed to retrieve current release: %v", err)
+				continue
+			}
+			// Version was successfully retrieved, notify if newer than ours
+			if version.Major > r.config.Major ||
+				(version.Major == r.config.Major && version.Minor > r.config.Minor) ||
+				(version.Major == r.config.Major && version.Minor == r.config.Minor && version.Patch > r.config.Patch) {
+
+				warning := fmt.Sprintf("Client v%d.%d.%d-%x seems older than the latest upstream release v%d.%d.%d-%x",
+					r.config.Major, r.config.Minor, r.config.Patch, r.config.Commit[:4], version.Major, version.Minor, version.Patch, version.Commit[:4])
+				howtofix := fmt.Sprintf("Please check https://github.com/ethereum/go-ethereum/releases for new releases")
+				separator := strings.Repeat("-", len(warning))
+
+				glog.V(logger.Warn).Info(separator)
+				glog.V(logger.Warn).Info(warning)
+				glog.V(logger.Warn).Info(howtofix)
+				glog.V(logger.Warn).Info(separator)
+			} else {
+				glog.V(logger.Debug).Infof("Client v%d.%d.%d-%x seems up to date with upstream v%d.%d.%d-%x",
+					r.config.Major, r.config.Minor, r.config.Patch, r.config.Commit[:4], version.Major, version.Minor, version.Patch, version.Commit[:4])
+			}
+
+		// If termination was requested, return
+		case errc := <-r.quit:
+			errc <- nil
+			return
+		}
+	}
+}