...

5 files changed, 946 insertions, 2 deletions

diff --git a/params/config.go b/params/config.go
new file mode 100644
index 0000000..23286cc
--- /dev/null
+++ b/params/config.go
@@ -0,0 +1,541 @@
+// 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 params
+
+import (
+	"encoding/binary"
+	"fmt"
+	"math/big"
+
+	"github.com/ava-labs/go-ethereum/common"
+	"github.com/ava-labs/go-ethereum/crypto"
+)
+
+// Genesis hashes to enforce below configs on.
+var (
+	MainnetGenesisHash = common.HexToHash("0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3")
+	TestnetGenesisHash = common.HexToHash("0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d")
+	RinkebyGenesisHash = common.HexToHash("0x6341fd3daf94b748c72ced5a5b26028f2474f5f00d824504e4fa37a75767e177")
+	GoerliGenesisHash  = common.HexToHash("0xbf7e331f7f7c1dd2e05159666b3bf8bc7a8a3a9eb1d518969eab529dd9b88c1a")
+)
+
+// TrustedCheckpoints associates each known checkpoint with the genesis hash of
+// the chain it belongs to.
+var TrustedCheckpoints = map[common.Hash]*TrustedCheckpoint{
+	MainnetGenesisHash: MainnetTrustedCheckpoint,
+	TestnetGenesisHash: TestnetTrustedCheckpoint,
+	RinkebyGenesisHash: RinkebyTrustedCheckpoint,
+	GoerliGenesisHash:  GoerliTrustedCheckpoint,
+}
+
+// CheckpointOracles associates each known checkpoint oracles with the genesis hash of
+// the chain it belongs to.
+var CheckpointOracles = map[common.Hash]*CheckpointOracleConfig{
+	MainnetGenesisHash: MainnetCheckpointOracle,
+	TestnetGenesisHash: TestnetCheckpointOracle,
+	RinkebyGenesisHash: RinkebyCheckpointOracle,
+	GoerliGenesisHash:  GoerliCheckpointOracle,
+}
+
+var (
+	// MainnetChainConfig is the chain parameters to run a node on the main network.
+	MainnetChainConfig = &ChainConfig{
+		ChainID:             big.NewInt(1),
+		HomesteadBlock:      big.NewInt(1150000),
+		DAOForkBlock:        big.NewInt(1920000),
+		DAOForkSupport:      true,
+		EIP150Block:         big.NewInt(2463000),
+		EIP150Hash:          common.HexToHash("0x2086799aeebeae135c246c65021c82b4e15a2c451340993aacfd2751886514f0"),
+		EIP155Block:         big.NewInt(2675000),
+		EIP158Block:         big.NewInt(2675000),
+		ByzantiumBlock:      big.NewInt(4370000),
+		ConstantinopleBlock: big.NewInt(7280000),
+		PetersburgBlock:     big.NewInt(7280000),
+		IstanbulBlock:       nil,
+		Ethash:              new(EthashConfig),
+	}
+
+	// MainnetTrustedCheckpoint contains the light client trusted checkpoint for the main network.
+	MainnetTrustedCheckpoint = &TrustedCheckpoint{
+		SectionIndex: 253,
+		SectionHead:  common.HexToHash("0xf35fabd036e2030196183bb70ae194f6ce1ea7b58559e3825c168f1df9c0a258"),
+		CHTRoot:      common.HexToHash("0x8992849e2be3390696eaf66312626e484045501cd3ec207922c27a6a80a7bb07"),
+		BloomRoot:    common.HexToHash("0xcc510b51ca4d73fb3fdf43208d73286f8f23817cdc31b8ea9f4de8d645f07df4"),
+	}
+
+	// MainnetCheckpointOracle contains a set of configs for the main network oracle.
+	MainnetCheckpointOracle = &CheckpointOracleConfig{
+		Address: common.HexToAddress("0x9a9070028361F7AAbeB3f2F2Dc07F82C4a98A02a"),
+		Signers: []common.Address{
+			common.HexToAddress("0x1b2C260efc720BE89101890E4Db589b44E950527"), // Peter
+			common.HexToAddress("0x78d1aD571A1A09D60D9BBf25894b44e4C8859595"), // Martin
+			common.HexToAddress("0x286834935f4A8Cfb4FF4C77D5770C2775aE2b0E7"), // Zsolt
+			common.HexToAddress("0xb86e2B0Ab5A4B1373e40c51A7C712c70Ba2f9f8E"), // Gary
+			common.HexToAddress("0x0DF8fa387C602AE62559cC4aFa4972A7045d6707"), // Guillaume
+		},
+		Threshold: 2,
+	}
+
+	// TestnetChainConfig contains the chain parameters to run a node on the Ropsten test network.
+	TestnetChainConfig = &ChainConfig{
+		ChainID:             big.NewInt(3),
+		HomesteadBlock:      big.NewInt(0),
+		DAOForkBlock:        nil,
+		DAOForkSupport:      true,
+		EIP150Block:         big.NewInt(0),
+		EIP150Hash:          common.HexToHash("0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d"),
+		EIP155Block:         big.NewInt(10),
+		EIP158Block:         big.NewInt(10),
+		ByzantiumBlock:      big.NewInt(1700000),
+		ConstantinopleBlock: big.NewInt(4230000),
+		PetersburgBlock:     big.NewInt(4939394),
+		IstanbulBlock:       nil,
+		Ethash:              new(EthashConfig),
+	}
+
+	// TestnetTrustedCheckpoint contains the light client trusted checkpoint for the Ropsten test network.
+	TestnetTrustedCheckpoint = &TrustedCheckpoint{
+		SectionIndex: 187,
+		SectionHead:  common.HexToHash("0x7d6db64d8ec43303e4392fb726d2346f7231b246decca3d8140dd7e2c0d0b07d"),
+		CHTRoot:      common.HexToHash("0xa5095e1a004a8642fb93ca682eb91e8f20ef5bce151e47404fbb68772d17705b"),
+		BloomRoot:    common.HexToHash("0x90b28050f948ec6fb35b23a91d9aed38ce0c92d3cdd6e1d383c1bddf8b4071cf"),
+	}
+
+	// TestnetCheckpointOracle contains a set of configs for the Ropsten test network oracle.
+	TestnetCheckpointOracle = &CheckpointOracleConfig{
+		Address: common.HexToAddress("0xEF79475013f154E6A65b54cB2742867791bf0B84"),
+		Signers: []common.Address{
+			common.HexToAddress("0x32162F3581E88a5f62e8A61892B42C46E2c18f7b"), // Peter
+			common.HexToAddress("0x78d1aD571A1A09D60D9BBf25894b44e4C8859595"), // Martin
+			common.HexToAddress("0x286834935f4A8Cfb4FF4C77D5770C2775aE2b0E7"), // Zsolt
+			common.HexToAddress("0xb86e2B0Ab5A4B1373e40c51A7C712c70Ba2f9f8E"), // Gary
+			common.HexToAddress("0x0DF8fa387C602AE62559cC4aFa4972A7045d6707"), // Guillaume
+		},
+		Threshold: 2,
+	}
+
+	// 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),
+		EIP150Hash:          common.HexToHash("0x9b095b36c15eaf13044373aef8ee0bd3a382a5abb92e402afa44b8249c3a90e9"),
+		EIP155Block:         big.NewInt(3),
+		EIP158Block:         big.NewInt(3),
+		ByzantiumBlock:      big.NewInt(1035301),
+		ConstantinopleBlock: big.NewInt(3660663),
+		PetersburgBlock:     big.NewInt(4321234),
+		IstanbulBlock:       nil,
+		Clique: &CliqueConfig{
+			Period: 15,
+			Epoch:  30000,
+		},
+	}
+
+	// RinkebyTrustedCheckpoint contains the light client trusted checkpoint for the Rinkeby test network.
+	RinkebyTrustedCheckpoint = &TrustedCheckpoint{
+		SectionIndex: 148,
+		SectionHead:  common.HexToHash("0x45918f4686732c2a3e80827e1bc39cdb6a27fa362ddfe1fdfb61c69a7f1df1a9"),
+		CHTRoot:      common.HexToHash("0x8ac7046391fec14834a2a0183513937c0b5f696666545991477d24b067008961"),
+		BloomRoot:    common.HexToHash("0xfe4b852517612d7da54bf7e9fc18861a83171a93c72583bb6a61893b74422168"),
+	}
+
+	// RinkebyCheckpointOracle contains a set of configs for the Rinkeby test network oracle.
+	RinkebyCheckpointOracle = &CheckpointOracleConfig{
+		Address: common.HexToAddress("0xebe8eFA441B9302A0d7eaECc277c09d20D684540"),
+		Signers: []common.Address{
+			common.HexToAddress("0xd9c9cd5f6779558b6e0ed4e6acf6b1947e7fa1f3"), // Peter
+			common.HexToAddress("0x78d1aD571A1A09D60D9BBf25894b44e4C8859595"), // Martin
+			common.HexToAddress("0x286834935f4A8Cfb4FF4C77D5770C2775aE2b0E7"), // Zsolt
+			common.HexToAddress("0xb86e2B0Ab5A4B1373e40c51A7C712c70Ba2f9f8E"), // Gary
+		},
+		Threshold: 2,
+	}
+
+	// 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),
+		IstanbulBlock:       nil,
+		Clique: &CliqueConfig{
+			Period: 15,
+			Epoch:  30000,
+		},
+	}
+
+	// GoerliTrustedCheckpoint contains the light client trusted checkpoint for the Görli test network.
+	GoerliTrustedCheckpoint = &TrustedCheckpoint{
+		SectionIndex: 32,
+		SectionHead:  common.HexToHash("0x50eaedd8361fa9edd0ac2dec410310b9bdf67b963b60f3b1dce47f84b30670f9"),
+		CHTRoot:      common.HexToHash("0x6504db73139f75ffa9102ae980e41b361cf3d5b66cea06c79cde9f457368820c"),
+		BloomRoot:    common.HexToHash("0x7551ae027bb776252a20ded51ee2ff0cbfbd1d8d57261b9161cc1f2f80237001"),
+	}
+
+	// GoerliCheckpointOracle contains a set of configs for the Goerli test network oracle.
+	GoerliCheckpointOracle = &CheckpointOracleConfig{
+		Address: common.HexToAddress("0x18CA0E045F0D772a851BC7e48357Bcaab0a0795D"),
+		Signers: []common.Address{
+			common.HexToAddress("0x4769bcaD07e3b938B7f43EB7D278Bc7Cb9efFb38"), // Peter
+			common.HexToAddress("0x78d1aD571A1A09D60D9BBf25894b44e4C8859595"), // Martin
+			common.HexToAddress("0x286834935f4A8Cfb4FF4C77D5770C2775aE2b0E7"), // Zsolt
+			common.HexToAddress("0xb86e2B0Ab5A4B1373e40c51A7C712c70Ba2f9f8E"), // Gary
+			common.HexToAddress("0x0DF8fa387C602AE62559cC4aFa4972A7045d6707"), // Guillaume
+		},
+		Threshold: 2,
+	}
+
+	// AllEthashProtocolChanges contains every protocol change (EIPs) introduced
+	// and accepted by the Ethereum core developers into the Ethash consensus.
+	//
+	// This configuration is intentionally not using keyed fields to force anyone
+	// adding flags to the config to also have to set these fields.
+	AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil}
+
+	// AllCliqueProtocolChanges contains every protocol change (EIPs) introduced
+	// and accepted by the Ethereum core developers into the Clique consensus.
+	//
+	// This configuration is intentionally not using keyed fields to force anyone
+	// adding flags to the config to also have to set these fields.
+	AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}}
+
+	TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil}
+	TestRules       = TestChainConfig.Rules(new(big.Int))
+)
+
+// TrustedCheckpoint represents a set of post-processed trie roots (CHT and
+// BloomTrie) associated with the appropriate section index and head hash. It is
+// used to start light syncing from this checkpoint and avoid downloading the
+// entire header chain while still being able to securely access old headers/logs.
+type TrustedCheckpoint struct {
+	SectionIndex uint64      `json:"sectionIndex"`
+	SectionHead  common.Hash `json:"sectionHead"`
+	CHTRoot      common.Hash `json:"chtRoot"`
+	BloomRoot    common.Hash `json:"bloomRoot"`
+}
+
+// HashEqual returns an indicator comparing the itself hash with given one.
+func (c *TrustedCheckpoint) HashEqual(hash common.Hash) bool {
+	if c.Empty() {
+		return hash == common.Hash{}
+	}
+	return c.Hash() == hash
+}
+
+// Hash returns the hash of checkpoint's four key fields(index, sectionHead, chtRoot and bloomTrieRoot).
+func (c *TrustedCheckpoint) Hash() common.Hash {
+	buf := make([]byte, 8+3*common.HashLength)
+	binary.BigEndian.PutUint64(buf, c.SectionIndex)
+	copy(buf[8:], c.SectionHead.Bytes())
+	copy(buf[8+common.HashLength:], c.CHTRoot.Bytes())
+	copy(buf[8+2*common.HashLength:], c.BloomRoot.Bytes())
+	return crypto.Keccak256Hash(buf)
+}
+
+// Empty returns an indicator whether the checkpoint is regarded as empty.
+func (c *TrustedCheckpoint) Empty() bool {
+	return c.SectionHead == (common.Hash{}) || c.CHTRoot == (common.Hash{}) || c.BloomRoot == (common.Hash{})
+}
+
+// CheckpointOracleConfig represents a set of checkpoint contract(which acts as an oracle)
+// config which used for light client checkpoint syncing.
+type CheckpointOracleConfig struct {
+	Address   common.Address   `json:"address"`
+	Signers   []common.Address `json:"signers"`
+	Threshold uint64           `json:"threshold"`
+}
+
+// ChainConfig is the core config which determines the blockchain settings.
+//
+// ChainConfig is stored in the database on a per block basis. This means
+// that any network, identified by its genesis block, can have its own
+// set of configuration options.
+type ChainConfig struct {
+	ChainID *big.Int `json:"chainId"` // chainId identifies the current chain and is used for replay protection
+
+	HomesteadBlock *big.Int `json:"homesteadBlock,omitempty"` // Homestead switch block (nil = no fork, 0 = already homestead)
+
+	DAOForkBlock   *big.Int `json:"daoForkBlock,omitempty"`   // TheDAO hard-fork switch block (nil = no fork)
+	DAOForkSupport bool     `json:"daoForkSupport,omitempty"` // Whether the nodes supports or opposes the DAO hard-fork
+
+	// EIP150 implements the Gas price changes (https://github.com/ethereum/EIPs/issues/150)
+	EIP150Block *big.Int    `json:"eip150Block,omitempty"` // EIP150 HF block (nil = no fork)
+	EIP150Hash  common.Hash `json:"eip150Hash,omitempty"`  // EIP150 HF hash (needed for header only clients as only gas pricing changed)
+
+	EIP155Block *big.Int `json:"eip155Block,omitempty"` // EIP155 HF block
+	EIP158Block *big.Int `json:"eip158Block,omitempty"` // EIP158 HF block
+
+	ByzantiumBlock      *big.Int `json:"byzantiumBlock,omitempty"`      // Byzantium switch block (nil = no fork, 0 = already on byzantium)
+	ConstantinopleBlock *big.Int `json:"constantinopleBlock,omitempty"` // Constantinople switch block (nil = no fork, 0 = already activated)
+	PetersburgBlock     *big.Int `json:"petersburgBlock,omitempty"`     // Petersburg switch block (nil = same as Constantinople)
+	IstanbulBlock       *big.Int `json:"istanbulBlock,omitempty"`       // Istanbul switch block (nil = no fork, 0 = already on istanbul)
+	EWASMBlock          *big.Int `json:"ewasmBlock,omitempty"`          // EWASM switch block (nil = no fork, 0 = already activated)
+
+	// Various consensus engines
+	Ethash *EthashConfig `json:"ethash,omitempty"`
+	Clique *CliqueConfig `json:"clique,omitempty"`
+}
+
+// EthashConfig is the consensus engine configs for proof-of-work based sealing.
+type EthashConfig struct{}
+
+// String implements the stringer interface, returning the consensus engine details.
+func (c *EthashConfig) String() string {
+	return "ethash"
+}
+
+// CliqueConfig is the consensus engine configs for proof-of-authority based sealing.
+type CliqueConfig struct {
+	Period uint64 `json:"period"` // Number of seconds between blocks to enforce
+	Epoch  uint64 `json:"epoch"`  // Epoch length to reset votes and checkpoint
+}
+
+// String implements the stringer interface, returning the consensus engine details.
+func (c *CliqueConfig) String() string {
+	return "clique"
+}
+
+// String implements the fmt.Stringer interface.
+func (c *ChainConfig) String() string {
+	var engine interface{}
+	switch {
+	case c.Ethash != nil:
+		engine = c.Ethash
+	case c.Clique != nil:
+		engine = c.Clique
+	default:
+		engine = "unknown"
+	}
+	return fmt.Sprintf("{ChainID: %v Homestead: %v DAO: %v DAOSupport: %v EIP150: %v EIP155: %v EIP158: %v Byzantium: %v Constantinople: %v Petersburg: %v Istanbul: %v Engine: %v}",
+		c.ChainID,
+		c.HomesteadBlock,
+		c.DAOForkBlock,
+		c.DAOForkSupport,
+		c.EIP150Block,
+		c.EIP155Block,
+		c.EIP158Block,
+		c.ByzantiumBlock,
+		c.ConstantinopleBlock,
+		c.PetersburgBlock,
+		c.IstanbulBlock,
+		engine,
+	)
+}
+
+// IsHomestead returns whether num is either equal to the homestead block or greater.
+func (c *ChainConfig) IsHomestead(num *big.Int) bool {
+	return isForked(c.HomesteadBlock, num)
+}
+
+// IsDAOFork returns whether num is either equal to the DAO fork block or greater.
+func (c *ChainConfig) IsDAOFork(num *big.Int) bool {
+	return isForked(c.DAOForkBlock, num)
+}
+
+// IsEIP150 returns whether num is either equal to the EIP150 fork block or greater.
+func (c *ChainConfig) IsEIP150(num *big.Int) bool {
+	return isForked(c.EIP150Block, num)
+}
+
+// IsEIP155 returns whether num is either equal to the EIP155 fork block or greater.
+func (c *ChainConfig) IsEIP155(num *big.Int) bool {
+	return isForked(c.EIP155Block, num)
+}
+
+// IsEIP158 returns whether num is either equal to the EIP158 fork block or greater.
+func (c *ChainConfig) IsEIP158(num *big.Int) bool {
+	return isForked(c.EIP158Block, num)
+}
+
+// IsByzantium returns whether num is either equal to the Byzantium fork block or greater.
+func (c *ChainConfig) IsByzantium(num *big.Int) bool {
+	return isForked(c.ByzantiumBlock, num)
+}
+
+// IsConstantinople returns whether num is either equal to the Constantinople fork block or greater.
+func (c *ChainConfig) IsConstantinople(num *big.Int) bool {
+	return isForked(c.ConstantinopleBlock, num)
+}
+
+// IsPetersburg returns whether num is either
+// - equal to or greater than the PetersburgBlock fork block,
+// - OR is nil, and Constantinople is active
+func (c *ChainConfig) IsPetersburg(num *big.Int) bool {
+	return isForked(c.PetersburgBlock, num) || c.PetersburgBlock == nil && isForked(c.ConstantinopleBlock, num)
+}
+
+// IsIstanbul returns whether num is either equal to the Istanbul fork block or greater.
+func (c *ChainConfig) IsIstanbul(num *big.Int) bool {
+	return isForked(c.IstanbulBlock, num)
+}
+
+// IsEWASM returns whether num represents a block number after the EWASM fork
+func (c *ChainConfig) IsEWASM(num *big.Int) bool {
+	return isForked(c.EWASMBlock, num)
+}
+
+// CheckCompatible checks whether scheduled fork transitions have been imported
+// with a mismatching chain configuration.
+func (c *ChainConfig) CheckCompatible(newcfg *ChainConfig, height uint64) *ConfigCompatError {
+	bhead := new(big.Int).SetUint64(height)
+
+	// Iterate checkCompatible to find the lowest conflict.
+	var lasterr *ConfigCompatError
+	for {
+		err := c.checkCompatible(newcfg, bhead)
+		if err == nil || (lasterr != nil && err.RewindTo == lasterr.RewindTo) {
+			break
+		}
+		lasterr = err
+		bhead.SetUint64(err.RewindTo)
+	}
+	return lasterr
+}
+
+func (c *ChainConfig) checkCompatible(newcfg *ChainConfig, head *big.Int) *ConfigCompatError {
+	if isForkIncompatible(c.HomesteadBlock, newcfg.HomesteadBlock, head) {
+		return newCompatError("Homestead fork block", c.HomesteadBlock, newcfg.HomesteadBlock)
+	}
+	if isForkIncompatible(c.DAOForkBlock, newcfg.DAOForkBlock, head) {
+		return newCompatError("DAO fork block", c.DAOForkBlock, newcfg.DAOForkBlock)
+	}
+	if c.IsDAOFork(head) && c.DAOForkSupport != newcfg.DAOForkSupport {
+		return newCompatError("DAO fork support flag", c.DAOForkBlock, newcfg.DAOForkBlock)
+	}
+	if isForkIncompatible(c.EIP150Block, newcfg.EIP150Block, head) {
+		return newCompatError("EIP150 fork block", c.EIP150Block, newcfg.EIP150Block)
+	}
+	if isForkIncompatible(c.EIP155Block, newcfg.EIP155Block, head) {
+		return newCompatError("EIP155 fork block", c.EIP155Block, newcfg.EIP155Block)
+	}
+	if isForkIncompatible(c.EIP158Block, newcfg.EIP158Block, head) {
+		return newCompatError("EIP158 fork block", c.EIP158Block, newcfg.EIP158Block)
+	}
+	if c.IsEIP158(head) && !configNumEqual(c.ChainID, newcfg.ChainID) {
+		return newCompatError("EIP158 chain ID", c.EIP158Block, newcfg.EIP158Block)
+	}
+	if isForkIncompatible(c.ByzantiumBlock, newcfg.ByzantiumBlock, head) {
+		return newCompatError("Byzantium fork block", c.ByzantiumBlock, newcfg.ByzantiumBlock)
+	}
+	if isForkIncompatible(c.ConstantinopleBlock, newcfg.ConstantinopleBlock, head) {
+		return newCompatError("Constantinople fork block", c.ConstantinopleBlock, newcfg.ConstantinopleBlock)
+	}
+	if isForkIncompatible(c.PetersburgBlock, newcfg.PetersburgBlock, head) {
+		return newCompatError("Petersburg fork block", c.PetersburgBlock, newcfg.PetersburgBlock)
+	}
+	if isForkIncompatible(c.IstanbulBlock, newcfg.IstanbulBlock, head) {
+		return newCompatError("Istanbul fork block", c.IstanbulBlock, newcfg.IstanbulBlock)
+	}
+	if isForkIncompatible(c.EWASMBlock, newcfg.EWASMBlock, head) {
+		return newCompatError("ewasm fork block", c.EWASMBlock, newcfg.EWASMBlock)
+	}
+	return nil
+}
+
+// isForkIncompatible returns true if a fork scheduled at s1 cannot be rescheduled to
+// block s2 because head is already past the fork.
+func isForkIncompatible(s1, s2, head *big.Int) bool {
+	return (isForked(s1, head) || isForked(s2, head)) && !configNumEqual(s1, s2)
+}
+
+// isForked returns whether a fork scheduled at block s is active at the given head block.
+func isForked(s, head *big.Int) bool {
+	if s == nil || head == nil {
+		return false
+	}
+	return s.Cmp(head) <= 0
+}
+
+func configNumEqual(x, y *big.Int) bool {
+	if x == nil {
+		return y == nil
+	}
+	if y == nil {
+		return x == nil
+	}
+	return x.Cmp(y) == 0
+}
+
+// ConfigCompatError is raised if the locally-stored blockchain is initialised with a
+// ChainConfig that would alter the past.
+type ConfigCompatError struct {
+	What string
+	// block numbers of the stored and new configurations
+	StoredConfig, NewConfig *big.Int
+	// the block number to which the local chain must be rewound to correct the error
+	RewindTo uint64
+}
+
+func newCompatError(what string, storedblock, newblock *big.Int) *ConfigCompatError {
+	var rew *big.Int
+	switch {
+	case storedblock == nil:
+		rew = newblock
+	case newblock == nil || storedblock.Cmp(newblock) < 0:
+		rew = storedblock
+	default:
+		rew = newblock
+	}
+	err := &ConfigCompatError{what, storedblock, newblock, 0}
+	if rew != nil && rew.Sign() > 0 {
+		err.RewindTo = rew.Uint64() - 1
+	}
+	return err
+}
+
+func (err *ConfigCompatError) Error() string {
+	return fmt.Sprintf("mismatching %s in database (have %d, want %d, rewindto %d)", err.What, err.StoredConfig, err.NewConfig, err.RewindTo)
+}
+
+// Rules wraps ChainConfig and is merely syntactic sugar or can be used for functions
+// that do not have or require information about the block.
+//
+// Rules is a one time interface meaning that it shouldn't be used in between transition
+// phases.
+type Rules struct {
+	ChainID                                                 *big.Int
+	IsHomestead, IsEIP150, IsEIP155, IsEIP158               bool
+	IsByzantium, IsConstantinople, IsPetersburg, IsIstanbul bool
+}
+
+// Rules ensures c's ChainID is not nil.
+func (c *ChainConfig) Rules(num *big.Int) Rules {
+	chainID := c.ChainID
+	if chainID == nil {
+		chainID = new(big.Int)
+	}
+	return Rules{
+		ChainID:          new(big.Int).Set(chainID),
+		IsHomestead:      c.IsHomestead(num),
+		IsEIP150:         c.IsEIP150(num),
+		IsEIP155:         c.IsEIP155(num),
+		IsEIP158:         c.IsEIP158(num),
+		IsByzantium:      c.IsByzantium(num),
+		IsConstantinople: c.IsConstantinople(num),
+		IsPetersburg:     c.IsPetersburg(num),
+		IsIstanbul:       c.IsIstanbul(num),
+	}
+}
diff --git a/params/dao.go b/params/dao.go
new file mode 100644
index 0000000..2d75845
--- /dev/null
+++ b/params/dao.go
@@ -0,0 +1,158 @@
+// 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 params
+
+import (
+	"math/big"
+
+	"github.com/ava-labs/go-ethereum/common"
+)
+
+// DAOForkBlockExtra is the block header extra-data field to set for the DAO fork
+// point and a number of consecutive blocks to allow fast/light syncers to correctly
+// pick the side they want  ("dao-hard-fork").
+var DAOForkBlockExtra = common.FromHex("0x64616f2d686172642d666f726b")
+
+// DAOForkExtraRange is the number of consecutive blocks from the DAO fork point
+// to override the extra-data in to prevent no-fork attacks.
+var DAOForkExtraRange = big.NewInt(10)
+
+// DAORefundContract is the address of the refund contract to send DAO balances to.
+var DAORefundContract = common.HexToAddress("0xbf4ed7b27f1d666546e30d74d50d173d20bca754")
+
+// DAODrainList is the list of accounts whose full balances will be moved into a
+// refund contract at the beginning of the dao-fork block.
+func DAODrainList() []common.Address {
+	return []common.Address{
+		common.HexToAddress("0xd4fe7bc31cedb7bfb8a345f31e668033056b2728"),
+		common.HexToAddress("0xb3fb0e5aba0e20e5c49d252dfd30e102b171a425"),
+		common.HexToAddress("0x2c19c7f9ae8b751e37aeb2d93a699722395ae18f"),
+		common.HexToAddress("0xecd135fa4f61a655311e86238c92adcd779555d2"),
+		common.HexToAddress("0x1975bd06d486162d5dc297798dfc41edd5d160a7"),
+		common.HexToAddress("0xa3acf3a1e16b1d7c315e23510fdd7847b48234f6"),
+		common.HexToAddress("0x319f70bab6845585f412ec7724b744fec6095c85"),
+		common.HexToAddress("0x06706dd3f2c9abf0a21ddcc6941d9b86f0596936"),
+		common.HexToAddress("0x5c8536898fbb74fc7445814902fd08422eac56d0"),
+		common.HexToAddress("0x6966ab0d485353095148a2155858910e0965b6f9"),
+		common.HexToAddress("0x779543a0491a837ca36ce8c635d6154e3c4911a6"),
+		common.HexToAddress("0x2a5ed960395e2a49b1c758cef4aa15213cfd874c"),
+		common.HexToAddress("0x5c6e67ccd5849c0d29219c4f95f1a7a93b3f5dc5"),
+		common.HexToAddress("0x9c50426be05db97f5d64fc54bf89eff947f0a321"),
+		common.HexToAddress("0x200450f06520bdd6c527622a273333384d870efb"),
+		common.HexToAddress("0xbe8539bfe837b67d1282b2b1d61c3f723966f049"),
+		common.HexToAddress("0x6b0c4d41ba9ab8d8cfb5d379c69a612f2ced8ecb"),
+		common.HexToAddress("0xf1385fb24aad0cd7432824085e42aff90886fef5"),
+		common.HexToAddress("0xd1ac8b1ef1b69ff51d1d401a476e7e612414f091"),
+		common.HexToAddress("0x8163e7fb499e90f8544ea62bbf80d21cd26d9efd"),
+		common.HexToAddress("0x51e0ddd9998364a2eb38588679f0d2c42653e4a6"),
+		common.HexToAddress("0x627a0a960c079c21c34f7612d5d230e01b4ad4c7"),
+		common.HexToAddress("0xf0b1aa0eb660754448a7937c022e30aa692fe0c5"),
+		common.HexToAddress("0x24c4d950dfd4dd1902bbed3508144a54542bba94"),
+		common.HexToAddress("0x9f27daea7aca0aa0446220b98d028715e3bc803d"),
+		common.HexToAddress("0xa5dc5acd6a7968a4554d89d65e59b7fd3bff0f90"),
+		common.HexToAddress("0xd9aef3a1e38a39c16b31d1ace71bca8ef58d315b"),
+		common.HexToAddress("0x63ed5a272de2f6d968408b4acb9024f4cc208ebf"),
+		common.HexToAddress("0x6f6704e5a10332af6672e50b3d9754dc460dfa4d"),
+		common.HexToAddress("0x77ca7b50b6cd7e2f3fa008e24ab793fd56cb15f6"),
+		common.HexToAddress("0x492ea3bb0f3315521c31f273e565b868fc090f17"),
+		common.HexToAddress("0x0ff30d6de14a8224aa97b78aea5388d1c51c1f00"),
+		common.HexToAddress("0x9ea779f907f0b315b364b0cfc39a0fde5b02a416"),
+		common.HexToAddress("0xceaeb481747ca6c540a000c1f3641f8cef161fa7"),
+		common.HexToAddress("0xcc34673c6c40e791051898567a1222daf90be287"),
+		common.HexToAddress("0x579a80d909f346fbfb1189493f521d7f48d52238"),
+		common.HexToAddress("0xe308bd1ac5fda103967359b2712dd89deffb7973"),
+		common.HexToAddress("0x4cb31628079fb14e4bc3cd5e30c2f7489b00960c"),
+		common.HexToAddress("0xac1ecab32727358dba8962a0f3b261731aad9723"),
+		common.HexToAddress("0x4fd6ace747f06ece9c49699c7cabc62d02211f75"),
+		common.HexToAddress("0x440c59b325d2997a134c2c7c60a8c61611212bad"),
+		common.HexToAddress("0x4486a3d68fac6967006d7a517b889fd3f98c102b"),
+		common.HexToAddress("0x9c15b54878ba618f494b38f0ae7443db6af648ba"),
+		common.HexToAddress("0x27b137a85656544b1ccb5a0f2e561a5703c6a68f"),
+		common.HexToAddress("0x21c7fdb9ed8d291d79ffd82eb2c4356ec0d81241"),
+		common.HexToAddress("0x23b75c2f6791eef49c69684db4c6c1f93bf49a50"),
+		common.HexToAddress("0x1ca6abd14d30affe533b24d7a21bff4c2d5e1f3b"),
+		common.HexToAddress("0xb9637156d330c0d605a791f1c31ba5890582fe1c"),
+		common.HexToAddress("0x6131c42fa982e56929107413a9d526fd99405560"),
+		common.HexToAddress("0x1591fc0f688c81fbeb17f5426a162a7024d430c2"),
+		common.HexToAddress("0x542a9515200d14b68e934e9830d91645a980dd7a"),
+		common.HexToAddress("0xc4bbd073882dd2add2424cf47d35213405b01324"),
+		common.HexToAddress("0x782495b7b3355efb2833d56ecb34dc22ad7dfcc4"),
+		common.HexToAddress("0x58b95c9a9d5d26825e70a82b6adb139d3fd829eb"),
+		common.HexToAddress("0x3ba4d81db016dc2890c81f3acec2454bff5aada5"),
+		common.HexToAddress("0xb52042c8ca3f8aa246fa79c3feaa3d959347c0ab"),
+		common.HexToAddress("0xe4ae1efdfc53b73893af49113d8694a057b9c0d1"),
+		common.HexToAddress("0x3c02a7bc0391e86d91b7d144e61c2c01a25a79c5"),
+		common.HexToAddress("0x0737a6b837f97f46ebade41b9bc3e1c509c85c53"),
+		common.HexToAddress("0x97f43a37f595ab5dd318fb46e7a155eae057317a"),
+		common.HexToAddress("0x52c5317c848ba20c7504cb2c8052abd1fde29d03"),
+		common.HexToAddress("0x4863226780fe7c0356454236d3b1c8792785748d"),
+		common.HexToAddress("0x5d2b2e6fcbe3b11d26b525e085ff818dae332479"),
+		common.HexToAddress("0x5f9f3392e9f62f63b8eac0beb55541fc8627f42c"),
+		common.HexToAddress("0x057b56736d32b86616a10f619859c6cd6f59092a"),
+		common.HexToAddress("0x9aa008f65de0b923a2a4f02012ad034a5e2e2192"),
+		common.HexToAddress("0x304a554a310c7e546dfe434669c62820b7d83490"),
+		common.HexToAddress("0x914d1b8b43e92723e64fd0a06f5bdb8dd9b10c79"),
+		common.HexToAddress("0x4deb0033bb26bc534b197e61d19e0733e5679784"),
+		common.HexToAddress("0x07f5c1e1bc2c93e0402f23341973a0e043f7bf8a"),
+		common.HexToAddress("0x35a051a0010aba705c9008d7a7eff6fb88f6ea7b"),
+		common.HexToAddress("0x4fa802324e929786dbda3b8820dc7834e9134a2a"),
+		common.HexToAddress("0x9da397b9e80755301a3b32173283a91c0ef6c87e"),
+		common.HexToAddress("0x8d9edb3054ce5c5774a420ac37ebae0ac02343c6"),
+		common.HexToAddress("0x0101f3be8ebb4bbd39a2e3b9a3639d4259832fd9"),
+		common.HexToAddress("0x5dc28b15dffed94048d73806ce4b7a4612a1d48f"),
+		common.HexToAddress("0xbcf899e6c7d9d5a215ab1e3444c86806fa854c76"),
+		common.HexToAddress("0x12e626b0eebfe86a56d633b9864e389b45dcb260"),
+		common.HexToAddress("0xa2f1ccba9395d7fcb155bba8bc92db9bafaeade7"),
+		common.HexToAddress("0xec8e57756626fdc07c63ad2eafbd28d08e7b0ca5"),
+		common.HexToAddress("0xd164b088bd9108b60d0ca3751da4bceb207b0782"),
+		common.HexToAddress("0x6231b6d0d5e77fe001c2a460bd9584fee60d409b"),
+		common.HexToAddress("0x1cba23d343a983e9b5cfd19496b9a9701ada385f"),
+		common.HexToAddress("0xa82f360a8d3455c5c41366975bde739c37bfeb8a"),
+		common.HexToAddress("0x9fcd2deaff372a39cc679d5c5e4de7bafb0b1339"),
+		common.HexToAddress("0x005f5cee7a43331d5a3d3eec71305925a62f34b6"),
+		common.HexToAddress("0x0e0da70933f4c7849fc0d203f5d1d43b9ae4532d"),
+		common.HexToAddress("0xd131637d5275fd1a68a3200f4ad25c71a2a9522e"),
+		common.HexToAddress("0xbc07118b9ac290e4622f5e77a0853539789effbe"),
+		common.HexToAddress("0x47e7aa56d6bdf3f36be34619660de61275420af8"),
+		common.HexToAddress("0xacd87e28b0c9d1254e868b81cba4cc20d9a32225"),
+		common.HexToAddress("0xadf80daec7ba8dcf15392f1ac611fff65d94f880"),
+		common.HexToAddress("0x5524c55fb03cf21f549444ccbecb664d0acad706"),
+		common.HexToAddress("0x40b803a9abce16f50f36a77ba41180eb90023925"),
+		common.HexToAddress("0xfe24cdd8648121a43a7c86d289be4dd2951ed49f"),
+		common.HexToAddress("0x17802f43a0137c506ba92291391a8a8f207f487d"),
+		common.HexToAddress("0x253488078a4edf4d6f42f113d1e62836a942cf1a"),
+		common.HexToAddress("0x86af3e9626fce1957c82e88cbf04ddf3a2ed7915"),
+		common.HexToAddress("0xb136707642a4ea12fb4bae820f03d2562ebff487"),
+		common.HexToAddress("0xdbe9b615a3ae8709af8b93336ce9b477e4ac0940"),
+		common.HexToAddress("0xf14c14075d6c4ed84b86798af0956deef67365b5"),
+		common.HexToAddress("0xca544e5c4687d109611d0f8f928b53a25af72448"),
+		common.HexToAddress("0xaeeb8ff27288bdabc0fa5ebb731b6f409507516c"),
+		common.HexToAddress("0xcbb9d3703e651b0d496cdefb8b92c25aeb2171f7"),
+		common.HexToAddress("0x6d87578288b6cb5549d5076a207456a1f6a63dc0"),
+		common.HexToAddress("0xb2c6f0dfbb716ac562e2d85d6cb2f8d5ee87603e"),
+		common.HexToAddress("0xaccc230e8a6e5be9160b8cdf2864dd2a001c28b6"),
+		common.HexToAddress("0x2b3455ec7fedf16e646268bf88846bd7a2319bb2"),
+		common.HexToAddress("0x4613f3bca5c44ea06337a9e439fbc6d42e501d0a"),
+		common.HexToAddress("0xd343b217de44030afaa275f54d31a9317c7f441e"),
+		common.HexToAddress("0x84ef4b2357079cd7a7c69fd7a37cd0609a679106"),
+		common.HexToAddress("0xda2fef9e4a3230988ff17df2165440f37e8b1708"),
+		common.HexToAddress("0xf4c64518ea10f995918a454158c6b61407ea345c"),
+		common.HexToAddress("0x7602b46df5390e432ef1c307d4f2c9ff6d65cc97"),
+		common.HexToAddress("0xbb9bc244d798123fde783fcc1c72d3bb8c189413"),
+		common.HexToAddress("0x807640a13483f8ac783c557fcdf27be11ea4ac7a"),
+	}
+}
diff --git a/params/network_params.go b/params/network_params.go
new file mode 100644
index 0000000..bba2472
--- /dev/null
+++ b/params/network_params.go
@@ -0,0 +1,61 @@
+// Copyright 2017 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 params
+
+// These are network parameters that need to be constant between clients, but
+// aren't necessarily consensus related.
+
+const (
+	// BloomBitsBlocks is the number of blocks a single bloom bit section vector
+	// contains on the server side.
+	BloomBitsBlocks uint64 = 4096
+
+	// BloomBitsBlocksClient is the number of blocks a single bloom bit section vector
+	// contains on the light client side
+	BloomBitsBlocksClient uint64 = 32768
+
+	// BloomConfirms is the number of confirmation blocks before a bloom section is
+	// considered probably final and its rotated bits are calculated.
+	BloomConfirms = 256
+
+	// CHTFrequency is the block frequency for creating CHTs
+	CHTFrequency = 32768
+
+	// BloomTrieFrequency is the block frequency for creating BloomTrie on both
+	// server/client sides.
+	BloomTrieFrequency = 32768
+
+	// HelperTrieConfirmations is the number of confirmations before a client is expected
+	// to have the given HelperTrie available.
+	HelperTrieConfirmations = 2048
+
+	// HelperTrieProcessConfirmations is the number of confirmations before a HelperTrie
+	// is generated
+	HelperTrieProcessConfirmations = 256
+
+	// CheckpointFrequency is the block frequency for creating checkpoint
+	CheckpointFrequency = 32768
+
+	// CheckpointProcessConfirmations is the number before a checkpoint is generated
+	CheckpointProcessConfirmations = 256
+
+	// ImmutabilityThreshold is the number of blocks after which a chain segment is
+	// considered immutable (i.e. soft finality). It is used by the downloader as a
+	// hard limit against deep ancestors, by the blockchain against deep reorgs, by
+	// the freezer as the cutoff treshold and by clique as the snapshot trust limit.
+	ImmutabilityThreshold = 90000
+)
diff --git a/params/protocol_params.go b/params/protocol_params.go
index c738450..b36dd91 100644
--- a/params/protocol_params.go
+++ b/params/protocol_params.go
@@ -16,8 +16,125 @@
 
 package params
 
-//import "math/big"
+import "math/big"
 
 const (
-	MaximumExtraDataSize uint64 = 64 // Maximum size extra data may be after Genesis.
+	GasLimitBoundDivisor uint64 = 1024    // The bound divisor of the gas limit, used in update calculations.
+	MinGasLimit          uint64 = 5000    // Minimum the gas limit may ever be.
+	GenesisGasLimit      uint64 = 4712388 // Gas limit of the Genesis block.
+
+	MaximumExtraDataSize  uint64 = 32    // Maximum size extra data may be after Genesis.
+	ExpByteGas            uint64 = 10    // Times ceil(log256(exponent)) for the EXP instruction.
+	SloadGas              uint64 = 50    // Multiplied by the number of 32-byte words that are copied (round up) for any *COPY operation and added.
+	CallValueTransferGas  uint64 = 9000  // Paid for CALL when the value transfer is non-zero.
+	CallNewAccountGas     uint64 = 25000 // Paid for CALL when the destination address didn't exist prior.
+	TxGas                 uint64 = 21000 // Per transaction not creating a contract. NOTE: Not payable on data of calls between transactions.
+	TxGasContractCreation uint64 = 53000 // Per transaction that creates a contract. NOTE: Not payable on data of calls between transactions.
+	TxDataZeroGas         uint64 = 4     // Per byte of data attached to a transaction that equals zero. NOTE: Not payable on data of calls between transactions.
+	QuadCoeffDiv          uint64 = 512   // Divisor for the quadratic particle of the memory cost equation.
+	LogDataGas            uint64 = 8     // Per byte in a LOG* operation's data.
+	CallStipend           uint64 = 2300  // Free gas given at beginning of call.
+
+	Sha3Gas     uint64 = 30 // Once per SHA3 operation.
+	Sha3WordGas uint64 = 6  // Once per word of the SHA3 operation's data.
+
+	SstoreSetGas    uint64 = 20000 // Once per SLOAD operation.
+	SstoreResetGas  uint64 = 5000  // Once per SSTORE operation if the zeroness changes from zero.
+	SstoreClearGas  uint64 = 5000  // Once per SSTORE operation if the zeroness doesn't change.
+	SstoreRefundGas uint64 = 15000 // Once per SSTORE operation if the zeroness changes to zero.
+
+	NetSstoreNoopGas  uint64 = 200   // Once per SSTORE operation if the value doesn't change.
+	NetSstoreInitGas  uint64 = 20000 // Once per SSTORE operation from clean zero.
+	NetSstoreCleanGas uint64 = 5000  // Once per SSTORE operation from clean non-zero.
+	NetSstoreDirtyGas uint64 = 200   // Once per SSTORE operation from dirty.
+
+	NetSstoreClearRefund      uint64 = 15000 // Once per SSTORE operation for clearing an originally existing storage slot
+	NetSstoreResetRefund      uint64 = 4800  // Once per SSTORE operation for resetting to the original non-zero value
+	NetSstoreResetClearRefund uint64 = 19800 // Once per SSTORE operation for resetting to the original zero value
+
+	SstoreSentryGasEIP2200   uint64 = 2300  // Minimum gas required to be present for an SSTORE call, not consumed
+	SstoreNoopGasEIP2200     uint64 = 800   // Once per SSTORE operation if the value doesn't change.
+	SstoreDirtyGasEIP2200    uint64 = 800   // Once per SSTORE operation if a dirty value is changed.
+	SstoreInitGasEIP2200     uint64 = 20000 // Once per SSTORE operation from clean zero to non-zero
+	SstoreInitRefundEIP2200  uint64 = 19200 // Once per SSTORE operation for resetting to the original zero value
+	SstoreCleanGasEIP2200    uint64 = 5000  // Once per SSTORE operation from clean non-zero to something else
+	SstoreCleanRefundEIP2200 uint64 = 4200  // Once per SSTORE operation for resetting to the original non-zero value
+	SstoreClearRefundEIP2200 uint64 = 15000 // Once per SSTORE operation for clearing an originally existing storage slot
+
+	JumpdestGas   uint64 = 1     // Once per JUMPDEST operation.
+	EMCGas        uint64 = 1     // Once per EMC operation.
+	EpochDuration uint64 = 30000 // Duration between proof-of-work epochs.
+
+	CreateDataGas            uint64 = 200   //
+	CallCreateDepth          uint64 = 1024  // Maximum depth of call/create stack.
+	ExpGas                   uint64 = 10    // Once per EXP instruction
+	LogGas                   uint64 = 375   // Per LOG* operation.
+	CopyGas                  uint64 = 3     //
+	StackLimit               uint64 = 1024  // Maximum size of VM stack allowed.
+	TierStepGas              uint64 = 0     // Once per operation, for a selection of them.
+	LogTopicGas              uint64 = 375   // Multiplied by the * of the LOG*, per LOG transaction. e.g. LOG0 incurs 0 * c_txLogTopicGas, LOG4 incurs 4 * c_txLogTopicGas.
+	CreateGas                uint64 = 32000 // Once per CREATE operation & contract-creation transaction.
+	Create2Gas               uint64 = 32000 // Once per CREATE2 operation
+	SelfdestructRefundGas    uint64 = 24000 // Refunded following a selfdestruct operation.
+	MemoryGas                uint64 = 3     // Times the address of the (highest referenced byte in memory + 1). NOTE: referencing happens on read, write and in instructions such as RETURN and CALL.
+	TxDataNonZeroGasFrontier uint64 = 68    // Per byte of data attached to a transaction that is not equal to zero. NOTE: Not payable on data of calls between transactions.
+	TxDataNonZeroGasEIP2028  uint64 = 16    // Per byte of non zero data attached to a transaction after EIP 2028 (part in Istanbul)
+
+	// These have been changed during the course of the chain
+	CallGasFrontier              uint64 = 40  // Once per CALL operation & message call transaction.
+	CallGasEIP150                uint64 = 700 // Static portion of gas for CALL-derivates after EIP 150 (Tangerine)
+	BalanceGasFrontier           uint64 = 20  // The cost of a BALANCE operation
+	BalanceGasEIP150             uint64 = 400 // The cost of a BALANCE operation after Tangerine
+	BalanceGasEIP1884            uint64 = 700 // The cost of a BALANCE operation after EIP 1884 (part of Istanbul)
+	ExtcodeSizeGasFrontier       uint64 = 20  // Cost of EXTCODESIZE before EIP 150 (Tangerine)
+	ExtcodeSizeGasEIP150         uint64 = 700 // Cost of EXTCODESIZE after EIP 150 (Tangerine)
+	SloadGasFrontier             uint64 = 50
+	SloadGasEIP150               uint64 = 200
+	SloadGasEIP1884              uint64 = 800  // Cost of SLOAD after EIP 1884 (part of Istanbul)
+	ExtcodeHashGasConstantinople uint64 = 400  // Cost of EXTCODEHASH (introduced in Constantinople)
+	ExtcodeHashGasEIP1884        uint64 = 700  // Cost of EXTCODEHASH after EIP 1884 (part in Istanbul)
+	SelfdestructGasEIP150        uint64 = 5000 // Cost of SELFDESTRUCT post EIP 150 (Tangerine)
+
+	// EXP has a dynamic portion depending on the size of the exponent
+	ExpByteFrontier uint64 = 10 // was set to 10 in Frontier
+	ExpByteEIP158   uint64 = 50 // was raised to 50 during Eip158 (Spurious Dragon)
+
+	// Extcodecopy has a dynamic AND a static cost. This represents only the
+	// static portion of the gas. It was changed during EIP 150 (Tangerine)
+	ExtcodeCopyBaseFrontier uint64 = 20
+	ExtcodeCopyBaseEIP150   uint64 = 700
+
+	// CreateBySelfdestructGas is used when the refunded account is one that does
+	// not exist. This logic is similar to call.
+	// Introduced in Tangerine Whistle (Eip 150)
+	CreateBySelfdestructGas uint64 = 25000
+
+	MaxCodeSize = 24576 // Maximum bytecode to permit for a contract
+
+	// Precompiled contract gas prices
+
+	EcrecoverGas        uint64 = 3000 // Elliptic curve sender recovery gas price
+	Sha256BaseGas       uint64 = 60   // Base price for a SHA256 operation
+	Sha256PerWordGas    uint64 = 12   // Per-word price for a SHA256 operation
+	Ripemd160BaseGas    uint64 = 600  // Base price for a RIPEMD160 operation
+	Ripemd160PerWordGas uint64 = 120  // Per-word price for a RIPEMD160 operation
+	IdentityBaseGas     uint64 = 15   // Base price for a data copy operation
+	IdentityPerWordGas  uint64 = 3    // Per-work price for a data copy operation
+	ModExpQuadCoeffDiv  uint64 = 20   // Divisor for the quadratic particle of the big int modular exponentiation
+
+	Bn256AddGasByzantium             uint64 = 500    // Byzantium gas needed for an elliptic curve addition
+	Bn256AddGasIstanbul              uint64 = 150    // Gas needed for an elliptic curve addition
+	Bn256ScalarMulGasByzantium       uint64 = 40000  // Byzantium gas needed for an elliptic curve scalar multiplication
+	Bn256ScalarMulGasIstanbul        uint64 = 6000   // Gas needed for an elliptic curve scalar multiplication
+	Bn256PairingBaseGasByzantium     uint64 = 100000 // Byzantium base price for an elliptic curve pairing check
+	Bn256PairingBaseGasIstanbul      uint64 = 45000  // Base price for an elliptic curve pairing check
+	Bn256PairingPerPointGasByzantium uint64 = 80000  // Byzantium per-point price for an elliptic curve pairing check
+	Bn256PairingPerPointGasIstanbul  uint64 = 34000  // Per-point price for an elliptic curve pairing check
+)
+
+var (
+	DifficultyBoundDivisor = big.NewInt(2048)   // The bound divisor of the difficulty, used in the update calculations.
+	GenesisDifficulty      = big.NewInt(131072) // Difficulty of the Genesis block.
+	MinimumDifficulty      = big.NewInt(131072) // The minimum that the difficulty may ever be.
+	DurationLimit          = big.NewInt(13)     // The decision boundary on the blocktime duration used to determine whether difficulty should go up or not.
 )
diff --git a/params/version.go b/params/version.go
new file mode 100644
index 0000000..94386f5
--- /dev/null
+++ b/params/version.go
@@ -0,0 +1,67 @@
+// 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 params
+
+import (
+	"fmt"
+)
+
+const (
+	VersionMajor = 1          // Major version component of the current release
+	VersionMinor = 9          // Minor version component of the current release
+	VersionPatch = 3          // Patch version component of the current release
+	VersionMeta  = "unstable" // Version metadata to append to the version string
+)
+
+// Version holds the textual version string.
+var Version = func() string {
+	return fmt.Sprintf("%d.%d.%d", VersionMajor, VersionMinor, VersionPatch)
+}()
+
+// VersionWithMeta holds the textual version string including the metadata.
+var VersionWithMeta = func() string {
+	v := Version
+	if VersionMeta != "" {
+		v += "-" + VersionMeta
+	}
+	return v
+}()
+
+// ArchiveVersion holds the textual version string used for Geth archives.
+// e.g. "1.8.11-dea1ce05" for stable releases, or
+//      "1.8.13-unstable-21c059b6" for unstable releases
+func ArchiveVersion(gitCommit string) string {
+	vsn := Version
+	if VersionMeta != "stable" {
+		vsn += "-" + VersionMeta
+	}
+	if len(gitCommit) >= 8 {
+		vsn += "-" + gitCommit[:8]
+	}
+	return vsn
+}
+
+func VersionWithCommit(gitCommit, gitDate string) string {
+	vsn := VersionWithMeta
+	if len(gitCommit) >= 8 {
+		vsn += "-" + gitCommit[:8]
+	}
+	if (VersionMeta != "stable") && (gitDate != "") {
+		vsn += "-" + gitDate
+	}
+	return vsn
+}