Remove reference of Rinkeby network.

We do not need ethereum Rinkeby network in our system, remove it.

12 files changed, 5 insertions, 166 deletions

diff --git a/cmd/clef/README.md b/cmd/clef/README.md
index c9461be10..1eba03e51 100644
--- a/cmd/clef/README.md
+++ b/cmd/clef/README.md
@@ -31,7 +31,7 @@ GLOBAL OPTIONS:
    --loglevel value        log level to emit to the screen (default: 4)
    --keystore value        Directory for the keystore (default: "$HOME/.ethereum/keystore")
    --configdir value       Directory for clef configuration (default: "$HOME/.clef")
-   --networkid value       Network identifier (integer, 1=Frontier, 2=Morden (disused), 3=Ropsten, 4=Rinkeby) (default: 1)
+   --networkid value       Network identifier (integer, 237=Mainnet, 238=Testnet) (default: 237)
    --lightkdf              Reduce key-derivation RAM & CPU usage at some expense of KDF strength
    --nousb                 Disables monitoring for and managing USB hardware wallets
    --rpcaddr value         HTTP-RPC server listening interface (default: "localhost")
diff --git a/cmd/geth/chaincmd.go b/cmd/geth/chaincmd.go
index 63850304a..ce4216a94 100644
--- a/cmd/geth/chaincmd.go
+++ b/cmd/geth/chaincmd.go
@@ -135,7 +135,6 @@ The export-preimages command export hash preimages to an RLP encoded stream`,
 			utils.SyncModeFlag,
 			utils.FakePoWFlag,
 			utils.TestnetFlag,
-			utils.RinkebyFlag,
 		},
 		Category: "BLOCKCHAIN COMMANDS",
 		Description: `
diff --git a/cmd/geth/consolecmd.go b/cmd/geth/consolecmd.go
index 528ed30e3..339919c8d 100644
--- a/cmd/geth/consolecmd.go
+++ b/cmd/geth/consolecmd.go
@@ -124,8 +124,6 @@ func remoteConsole(ctx *cli.Context) error {
 		if path != "" {
 			if ctx.GlobalBool(utils.TestnetFlag.Name) {
 				path = filepath.Join(path, "testnet")
-			} else if ctx.GlobalBool(utils.RinkebyFlag.Name) {
-				path = filepath.Join(path, "rinkeby")
 			}
 		}
 		endpoint = fmt.Sprintf("%s/geth.ipc", path)
diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index 0ace5b792..956469b9e 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -120,8 +120,6 @@ var (
 		utils.DeveloperFlag,
 		utils.DeveloperPeriodFlag,
 		utils.TestnetFlag,
-		utils.RinkebyFlag,
-		utils.GoerliFlag,
 		utils.VMEnableDebugFlag,
 		utils.NetworkIdFlag,
 		utils.ConstantinopleOverrideFlag,
diff --git a/cmd/geth/usage.go b/cmd/geth/usage.go
index 0c5642ace..18c9743e0 100644
--- a/cmd/geth/usage.go
+++ b/cmd/geth/usage.go
@@ -73,8 +73,6 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.NoUSBFlag,
 			utils.NetworkIdFlag,
 			utils.TestnetFlag,
-			utils.RinkebyFlag,
-			utils.GoerliFlag,
 			utils.SyncModeFlag,
 			utils.GCModeFlag,
 			utils.EthStatsURLFlag,
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 2a1f8c765..cf41f5cdd 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -130,21 +130,13 @@ var (
 	}
 	NetworkIdFlag = cli.Uint64Flag{
 		Name:  "networkid",
-		Usage: "Network identifier (integer, 237=Mainnet, 238=Testnet)",
+		Usage: "Network identifier (integer, 237=Mainnet, 238=Testnet) (default: 237)",
 		Value: eth.DefaultConfig.NetworkId,
 	}
 	TestnetFlag = cli.BoolFlag{
 		Name:  "testnet",
 		Usage: "Ropsten network: pre-configured proof-of-work test network",
 	}
-	RinkebyFlag = cli.BoolFlag{
-		Name:  "rinkeby",
-		Usage: "Rinkeby network: pre-configured proof-of-authority test network",
-	}
-	GoerliFlag = cli.BoolFlag{
-		Name:  "goerli",
-		Usage: "Görli network: pre-configured proof-of-authority test network",
-	}
 	ConstantinopleOverrideFlag = cli.Uint64Flag{
 		Name:  "override.constantinople",
 		Usage: "Manually specify constantinople fork-block, overriding the bundled setting",
@@ -653,12 +645,6 @@ func MakeDataDir(ctx *cli.Context) string {
 		if ctx.GlobalBool(TestnetFlag.Name) {
 			return filepath.Join(path, "testnet")
 		}
-		if ctx.GlobalBool(RinkebyFlag.Name) {
-			return filepath.Join(path, "rinkeby")
-		}
-		if ctx.GlobalBool(GoerliFlag.Name) {
-			return filepath.Join(path, "goerli")
-		}
 		return path
 	}
 	Fatalf("Cannot determine default data directory, please set manually (--datadir)")
@@ -711,10 +697,6 @@ func setBootstrapNodes(ctx *cli.Context, cfg *p2p.Config) {
 		}
 	case ctx.GlobalBool(TestnetFlag.Name):
 		urls = params.TestnetBootnodes
-	case ctx.GlobalBool(RinkebyFlag.Name):
-		urls = params.RinkebyBootnodes
-	case ctx.GlobalBool(GoerliFlag.Name):
-		urls = params.GoerliBootnodes
 	case cfg.BootstrapNodes != nil:
 		return // already set, don't apply defaults.
 	}
@@ -740,10 +722,6 @@ func setBootstrapNodesV5(ctx *cli.Context, cfg *p2p.Config) {
 		} else {
 			urls = strings.Split(ctx.GlobalString(BootnodesFlag.Name), ",")
 		}
-	case ctx.GlobalBool(RinkebyFlag.Name):
-		urls = params.RinkebyBootnodes
-	case ctx.GlobalBool(GoerliFlag.Name):
-		urls = params.GoerliBootnodes
 	case cfg.BootstrapNodesV5 != nil:
 		return // already set, don't apply defaults.
 	}
@@ -1018,10 +996,6 @@ func setDataDir(ctx *cli.Context, cfg *node.Config) {
 		cfg.DataDir = "" // unless explicitly requested, use memory databases
 	case ctx.GlobalBool(TestnetFlag.Name):
 		cfg.DataDir = filepath.Join(node.DefaultDataDir(), "testnet")
-	case ctx.GlobalBool(RinkebyFlag.Name):
-		cfg.DataDir = filepath.Join(node.DefaultDataDir(), "rinkeby")
-	case ctx.GlobalBool(GoerliFlag.Name):
-		cfg.DataDir = filepath.Join(node.DefaultDataDir(), "goerli")
 	}
 }
 
@@ -1178,7 +1152,7 @@ func SetShhConfig(ctx *cli.Context, stack *node.Node, cfg *whisper.Config) {
 // SetDexConfig applies eth-related command line flags to the config.
 func SetDexConfig(ctx *cli.Context, stack *node.Node, cfg *dex.Config) {
 	// Avoid conflicting network flags
-	checkExclusive(ctx, DeveloperFlag, TestnetFlag, RinkebyFlag, GoerliFlag)
+	checkExclusive(ctx, DeveloperFlag, TestnetFlag)
 	checkExclusive(ctx, LightServFlag, SyncModeFlag, "light")
 
 	ks := stack.AccountManager().Backends(keystore.KeyStoreType)[0].(*keystore.KeyStore)
@@ -1236,19 +1210,9 @@ func SetDexConfig(ctx *cli.Context, stack *node.Node, cfg *dex.Config) {
 	switch {
 	case ctx.GlobalBool(TestnetFlag.Name):
 		if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
-			cfg.NetworkId = 3
+			cfg.NetworkId = 238
 		}
 		cfg.Genesis = core.DefaultTestnetGenesisBlock()
-	case ctx.GlobalBool(RinkebyFlag.Name):
-		if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
-			cfg.NetworkId = 4
-		}
-		cfg.Genesis = core.DefaultRinkebyGenesisBlock()
-	case ctx.GlobalBool(GoerliFlag.Name):
-		if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
-			cfg.NetworkId = 5
-		}
-		cfg.Genesis = core.DefaultGoerliGenesisBlock()
 	case ctx.GlobalBool(DeveloperFlag.Name):
 		if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
 			cfg.NetworkId = 1337
@@ -1402,10 +1366,6 @@ func MakeGenesis(ctx *cli.Context) *core.Genesis {
 	switch {
 	case ctx.GlobalBool(TestnetFlag.Name):
 		genesis = core.DefaultTestnetGenesisBlock()
-	case ctx.GlobalBool(RinkebyFlag.Name):
-		genesis = core.DefaultRinkebyGenesisBlock()
-	case ctx.GlobalBool(GoerliFlag.Name):
-		genesis = core.DefaultGoerliGenesisBlock()
 	case ctx.GlobalBool(DeveloperFlag.Name):
 		Fatalf("Developer chains are ephemeral")
 	}
diff --git a/core/genesis.go b/core/genesis.go
index b73ad10f9..cdc5531f2 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -375,30 +375,6 @@ func DefaultTestnetGenesisBlock() *Genesis {
 	}
 }
 
-// DefaultRinkebyGenesisBlock returns the Rinkeby network genesis block.
-func DefaultRinkebyGenesisBlock() *Genesis {
-	return &Genesis{
-		Config:     params.RinkebyChainConfig,
-		Timestamp:  1492009146,
-		ExtraData:  hexutil.MustDecode("0x52657370656374206d7920617574686f7269746168207e452e436172746d616e42eb768f2244c8811c63729a21a3569731535f067ffc57839b00206d1ad20c69a1981b489f772031b279182d99e65703f0076e4812653aab85fca0f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"),
-		GasLimit:   4700000,
-		Difficulty: big.NewInt(1),
-		Alloc:      decodePrealloc(rinkebyAllocData),
-	}
-}
-
-// DefaultGoerliGenesisBlock returns the Görli network genesis block.
-func DefaultGoerliGenesisBlock() *Genesis {
-	return &Genesis{
-		Config:     params.GoerliChainConfig,
-		Timestamp:  1548854791,
-		ExtraData:  hexutil.MustDecode("0x22466c6578692069732061207468696e6722202d204166726900000000000000e0a2bd4258d2768837baa26a28fe71dc079f84c70000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"),
-		GasLimit:   10485760,
-		Difficulty: big.NewInt(1),
-		Alloc:      decodePrealloc(goerliAllocData),
-	}
-}
-
 // DeveloperGenesisBlock returns the 'geth --dev' genesis block. Note, this must
 // be seeded with the
 func DeveloperGenesisBlock(period uint64, faucet common.Address) *Genesis {
@@ -421,7 +397,7 @@ func DeveloperGenesisBlock(period uint64, faucet common.Address) *Genesis {
 			common.BytesToAddress([]byte{6}): {Balance: big.NewInt(1)}, // ECAdd
 			common.BytesToAddress([]byte{7}): {Balance: big.NewInt(1)}, // ECScalarMul
 			common.BytesToAddress([]byte{8}): {Balance: big.NewInt(1)}, // ECPairing
-			faucet: {Balance: new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(9))},
+			faucet:                           {Balance: new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(9))},
 		},
 	}
 }
diff --git a/core/genesis_alloc.go b/core/genesis_alloc.go
index f75b62f5a..48636c72f 100644
--- a/core/genesis_alloc.go
+++ b/core/genesis_alloc.go
@@ -24,4 +24,3 @@ package core
 const mainnetAllocData = "\xf9\x02\x18\xf8o\x946\x1eIX\xbd\x8bM\x03\\h\xc4s\x19>w\xfd\xabj\xea\x9d\xf8X\x8965\u026d\xc5\u07a0\x00\x00\x89\x1b\x1a\xe4\xd6\xe2\xefP\x00\x00\x80\xb8A\x04\f/\a\xcf\"\x96n\xba\xa1\x9d\xd8}\xe1\x1d\x04\xf9\xa6\x06\xe8>u\xa5)Utv\nZM\xd8(\a\xe7\xd9\xf2\x8f\x86\xcd8\x98q\u0753\x1aG|\xacd\xe23\xa6\xf0\x98\u0572W\x87\x1d\x81c\xdc\x1b\xdd\xcf\xee\x94Wei-Ning Sonic Bojie\u0600\x80\x94Wei-Ning Sonic Bojie\x80\xf8o\x94\xb6\xa2\xe2p\xb5O\x19\xb4\x00-e5\xa7\x1c\xfd\xd1\xca\x1f_\xc1\xf8X\x8965\u026d\xc5\u07a0\x00\x00\x89\x1b\x1a\xe4\xd6\xe2\xefP\x00\x00\x80\xb8A\x04c\xf7\x8d9\x8fk\x04)R\x06*&\xf3U\x1aN)J\x11\bK\x10\x06\xc8\xd67d7\xb7$\x88\xd8\xf3\xafk\x84\x991\xc06$\xad-X\x19\x00\xe9\xad_<\xfe\xee\xd0@\u01d9\xe50\x8c\xd8\x01(S\xfb\xf8o\x94\xb6\xbb\xbe9\x0311\xe4(\u0563TXV\xa5\x96\xca\xcbx\x10\xf8X\x8965\u026d\xc5\u07a0\x00\x00\x89\x1b\x1a\xe4\xd6\xe2\xefP\x00\x00\x80\xb8A\x04\xa1\x11\x8c\x8f\x1c.)=\xe5(\xe5\xb4Z\xc5\xe6Qg\xafL\xb4\xd1\b\x87\x92J\x9f\x83\x92\x87\xd0`\xda&AN\x97\x1c\xabu\x01>V\r\xfe\u01c9{\x19\x83\xea\xa61\xae/\x16\xea@bRS\x10\xed\xd8\xea\xf8o\x94\xbcq\xc0\xf2\xae\xcaF\xfa\x00\x01\xe7e\x96P)\xb1j\x06\x04\x9e\xf8X\x8965\u026d\xc5\u07a0\x00\x00\x89\x1b\x1a\xe4\xd6\xe2\xefP\x00\x00\x80\xb8A\x04\xa1*\x01_'\u064eS\x05I\x8d#\xae\xac\xde(\x1eH\xaa\xd9\x18\xae\x87\xd7\xf6\x17\x84\xabC\x82\x89S\u06d9\xbf\x1fDBb\x94\xcb\xc2\x1e2\xcf:\x99\x12/,\xe8\xa3[\xa7\x18\xa7\xc8\x14\xee\u01fa\xe9\xa3\xea\u453f\x8cH\xa6 \xba\xccF\x90\u007f\x9b\x89s-%\xe4z-|\xf7\u038a\x15-\x02\xc7\xe1J\xf6\x80\x00\x00\x80\x80\x80"
 
 const testnetAllocData = mainnetAllocData
-const rinkebyAllocData = mainnetAllocData
diff --git a/light/postprocess.go b/light/postprocess.go
index 95515fa79..b1a384b5d 100644
--- a/light/postprocess.go
+++ b/light/postprocess.go
@@ -108,8 +108,6 @@ var (
 var trustedCheckpoints = map[common.Hash]*params.TrustedCheckpoint{
 	params.MainnetGenesisHash: params.MainnetTrustedCheckpoint,
 	params.TestnetGenesisHash: params.TestnetTrustedCheckpoint,
-	params.RinkebyGenesisHash: params.RinkebyTrustedCheckpoint,
-	params.GoerliGenesisHash:  params.GoerliTrustedCheckpoint,
 }
 
 var (
diff --git a/mobile/params.go b/mobile/params.go
index bfcbf67af..f9b94b130 100644
--- a/mobile/params.go
+++ b/mobile/params.go
@@ -41,15 +41,6 @@ func TestnetGenesis() string {
 	return string(enc)
 }
 
-// RinkebyGenesis returns the JSON spec to use for the Rinkeby test network
-func RinkebyGenesis() string {
-	enc, err := json.Marshal(core.DefaultRinkebyGenesisBlock())
-	if err != nil {
-		panic(err)
-	}
-	return string(enc)
-}
-
 // FoundationBootnodes returns the enode URLs of the P2P bootstrap nodes operated
 // by the foundation running the V5 discovery protocol.
 func FoundationBootnodes() *Enodes {
diff --git a/params/bootnodes.go b/params/bootnodes.go
index 379e97381..3c6ec8555 100644
--- a/params/bootnodes.go
+++ b/params/bootnodes.go
@@ -28,28 +28,6 @@ var TestnetBootnodes = []string{
 	"enode://0478aa13c91aa0db8e93b668313b7eb0532fbdb24f64772375373b14dbe326c238ad09ab4469f6442c9a9753f1275aeec2e531912c14a958ed1feb4ae7e227ef@127.0.0.1:30301",
 }
 
-// RinkebyBootnodes are the enode URLs of the P2P bootstrap nodes running on the
-// Rinkeby test network.
-var RinkebyBootnodes = []string{
-	"enode://a24ac7c5484ef4ed0c5eb2d36620ba4e4aa13b8c84684e1b4aab0cebea2ae45cb4d375b77eab56516d34bfbd3c1a833fc51296ff084b770b94fb9028c4d25ccf@52.169.42.101:30303", // IE
-	"enode://343149e4feefa15d882d9fe4ac7d88f885bd05ebb735e547f12e12080a9fa07c8014ca6fd7f373123488102fe5e34111f8509cf0b7de3f5b44339c9f25e87cb8@52.3.158.184:30303",  // INFURA
-	"enode://b6b28890b006743680c52e64e0d16db57f28124885595fa03a562be1d2bf0f3a1da297d56b13da25fb992888fd556d4c1a27b1f39d531bde7de1921c90061cc6@159.89.28.211:30303", // AKASHA
-}
-
-// GoerliBootnodes are the enode URLs of the P2P bootstrap nodes running on the
-// Görli test network.
-var GoerliBootnodes = []string{
-	// Upstrem bootnodes
-	"enode://011f758e6552d105183b1761c5e2dea0111bc20fd5f6422bc7f91e0fabbec9a6595caf6239b37feb773dddd3f87240d99d859431891e4a642cf2a0a9e6cbb98a@51.141.78.53:30303",
-	"enode://176b9417f511d05b6b2cf3e34b756cf0a7096b3094572a8f6ef4cdcb9d1f9d00683bf0f83347eebdf3b81c3521c2332086d9592802230bf528eaf606a1d9677b@13.93.54.137:30303",
-	"enode://46add44b9f13965f7b9875ac6b85f016f341012d84f975377573800a863526f4da19ae2c620ec73d11591fa9510e992ecc03ad0751f53cc02f7c7ed6d55c7291@94.237.54.114:30313",
-	"enode://c1f8b7c2ac4453271fa07d8e9ecf9a2e8285aa0bd0c07df0131f47153306b0736fd3db8924e7a9bf0bed6b1d8d4f87362a71b033dc7c64547728d953e43e59b2@52.64.155.147:30303",
-	"enode://f4a9c6ee28586009fb5a96c8af13a58ed6d8315a9eee4772212c1d4d9cebe5a8b8a78ea4434f318726317d04a3f531a1ef0420cf9752605a562cfe858c46e263@213.186.16.82:30303",
-
-	// Ethereum Foundation bootnode
-	"enode://573b6607cd59f241e30e4c4943fd50e99e2b6f42f9bd5ca111659d309c06741247f4f1e93843ad3e8c8c18b6e2d94c161b7ef67479b3938780a97134b618b5ce@52.56.136.200:30303",
-}
-
 // DiscoveryV5Bootnodes are the enode URLs of the P2P bootstrap nodes for the
 // experimental RLPx v5 topic-discovery network.
 var DiscoveryV5Bootnodes = []string{
diff --git a/params/config.go b/params/config.go
index 564998fef..bfd46dac6 100644
--- a/params/config.go
+++ b/params/config.go
@@ -28,8 +28,6 @@ import (
 var (
 	MainnetGenesisHash = common.HexToHash("0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3")
 	TestnetGenesisHash = common.HexToHash("0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d")
-	RinkebyGenesisHash = common.HexToHash("0x6341fd3daf94b748c72ced5a5b26028f2474f5f00d824504e4fa37a75767e177")
-	GoerliGenesisHash  = common.HexToHash("0xbf7e331f7f7c1dd2e05159666b3bf8bc7a8a3a9eb1d518969eab529dd9b88c1a")
 )
 
 var (
@@ -110,60 +108,6 @@ var (
 		BloomRoot:    common.HexToHash("0x5ac25c84bd18a9cbe878d4609a80220f57f85037a112644532412ba0d498a31b"),
 	}
 
-	// RinkebyChainConfig contains the chain parameters to run a node on the Rinkeby test network.
-	RinkebyChainConfig = &ChainConfig{
-		ChainID:             big.NewInt(4),
-		HomesteadBlock:      big.NewInt(1),
-		DAOForkBlock:        nil,
-		DAOForkSupport:      true,
-		EIP150Block:         big.NewInt(2),
-		EIP155Block:         big.NewInt(3),
-		EIP158Block:         big.NewInt(3),
-		ByzantiumBlock:      big.NewInt(1035301),
-		ConstantinopleBlock: big.NewInt(3660663),
-		PetersburgBlock:     big.NewInt(4321234),
-		Clique: &CliqueConfig{
-			Period: 15,
-			Epoch:  30000,
-		},
-	}
-
-	// RinkebyTrustedCheckpoint contains the light client trusted checkpoint for the Rinkeby test network.
-	RinkebyTrustedCheckpoint = &TrustedCheckpoint{
-		Name:         "rinkeby",
-		SectionIndex: 125,
-		SectionHead:  common.HexToHash("0x8a738386f6bb34add15846f8f49c4c519a2f32519096e792b9f43bcb407c831c"),
-		CHTRoot:      common.HexToHash("0xa1e5720a9bad4dce794f129e4ac6744398197b652868011486a6f89c8ec84a75"),
-		BloomRoot:    common.HexToHash("0xa3048fe8b7e30f77f11bc755a88478363d7d3e71c2bdfe4e8ab9e269cd804ba2"),
-	}
-
-	// GoerliChainConfig contains the chain parameters to run a node on the Görli test network.
-	GoerliChainConfig = &ChainConfig{
-		ChainID:             big.NewInt(5),
-		HomesteadBlock:      big.NewInt(0),
-		DAOForkBlock:        nil,
-		DAOForkSupport:      true,
-		EIP150Block:         big.NewInt(0),
-		EIP155Block:         big.NewInt(0),
-		EIP158Block:         big.NewInt(0),
-		ByzantiumBlock:      big.NewInt(0),
-		ConstantinopleBlock: big.NewInt(0),
-		PetersburgBlock:     big.NewInt(0),
-		Clique: &CliqueConfig{
-			Period: 15,
-			Epoch:  30000,
-		},
-	}
-
-	// GoerliTrustedCheckpoint contains the light client trusted checkpoint for the Görli test network.
-	GoerliTrustedCheckpoint = &TrustedCheckpoint{
-		Name:         "goerli",
-		SectionIndex: 9,
-		SectionHead:  common.HexToHash("0x8e223d827391eee53b07cb8ee057dbfa11c93e0b45352188c783affd7840a921"),
-		CHTRoot:      common.HexToHash("0xe0a817ac69b36c1e437c5b0cff9e764853f5115702b5f66d451b665d6afb7e78"),
-		BloomRoot:    common.HexToHash("0x50d672aeb655b723284969c7c1201fb6ca003c23ed144bcb9f2d1b30e2971c1b"),
-	}
-
 	// AllEthashProtocolChanges contains every protocol change (EIPs) introduced
 	// and accepted by the Ethereum core developers into the Ethash consensus.
 	//