@@ -85,6 +85,7 @@ var (
 		PetersburgBlock:     big.NewInt(7_280_000),
 		IstanbulBlock:       big.NewInt(9_069_000),
 		MuirGlacierBlock:    big.NewInt(9_200_000),
+		RamanujanBlock:      big.NewInt(0),
 		BerlinBlock:         big.NewInt(12_244_000),
 		LondonBlock:         big.NewInt(12_965_000),
 		ArrowGlacierBlock:   big.NewInt(13_773_000),
// 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"
	"math/big"
	"path"

	"github.com/ledgerwatch/erigon/common"
	"github.com/ledgerwatch/erigon/common/paths"
)

const (
	MainnetChainName = "mainnet"
	RopstenChainName = "ropsten"
	RinkebyChainName = "rinkeby"
	GoerliChainName  = "goerli"
	DevChainName     = "dev"
	ErigonMineName   = "erigonmine"
	SokolChainName   = "sokol"
	KovanChainName   = "kovan"
	FermionChainName = "fermion"
)

type ConsensusType string

const (
	AuRaConsensus   ConsensusType = "aura"
	EtHashConsensus ConsensusType = "ethash"
	CliqueConsensus ConsensusType = "clique"
)

// Genesis hashes to enforce below configs on.
var (
	MainnetGenesisHash = common.HexToHash("0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3")
	RopstenGenesisHash = common.HexToHash("0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d")
	RinkebyGenesisHash = common.HexToHash("0x6341fd3daf94b748c72ced5a5b26028f2474f5f00d824504e4fa37a75767e177")
	GoerliGenesisHash  = common.HexToHash("0xbf7e331f7f7c1dd2e05159666b3bf8bc7a8a3a9eb1d518969eab529dd9b88c1a")
	ErigonGenesisHash  = common.HexToHash("0xfecd5c85712e36f30f09ba3a42386b42c46b5ba5395a4246b952e655f9aa0f58")
	SokolGenesisHash   = common.HexToHash("0x5b28c1bfd3a15230c9a46b399cd0f9a6920d432e85381cc6a140b06e8410112f")
	KovanGenesisHash   = common.HexToHash("0xa3c565fc15c7478862d50ccd6561e3c06b24cc509bf388941c25ea985ce32cb9")
	FermionGenesisHash = common.HexToHash("0x0658360d8680ead416900a552b67b84e6d575c7f0ecab3dbe42406f9f8c34c35")
)

var (
	SokolGenesisEpochProof = common.FromHex("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)

var (
	SokolGenesisStateRoot   = common.HexToHash("0xfad4af258fd11939fae0c6c6eec9d340b1caac0b0196fd9a1bc3f489c5bf00b3")
	KovanGenesisStateRoot   = common.HexToHash("0x2480155b48a1cea17d67dbfdfaafe821c1d19cdd478c5358e8ec56dec24502b2")
	FermionGenesisStateRoot = common.HexToHash("0x08982dc16236c51b6d9aff8b76cd0faa7067eb55eba62395d5a82649d8fb73c4")
)

var (
	// MainnetChainConfig is the chain parameters to run a node on the main network.
	MainnetChainConfig = &ChainConfig{
		ChainName:           MainnetChainName,
		ChainID:             big.NewInt(1),
		Consensus:           EtHashConsensus,
		HomesteadBlock:      big.NewInt(1_150_000),
		DAOForkBlock:        big.NewInt(1_920_000),
		DAOForkSupport:      true,
		EIP150Block:         big.NewInt(2_463_000),
		EIP150Hash:          common.HexToHash("0x2086799aeebeae135c246c65021c82b4e15a2c451340993aacfd2751886514f0"),
		EIP155Block:         big.NewInt(2_675_000),
		EIP158Block:         big.NewInt(2_675_000),
		ByzantiumBlock:      big.NewInt(4_370_000),
		ConstantinopleBlock: big.NewInt(7_280_000),
		PetersburgBlock:     big.NewInt(7_280_000),
		IstanbulBlock:       big.NewInt(9_069_000),
		MuirGlacierBlock:    big.NewInt(9_200_000),
		BerlinBlock:         big.NewInt(12_244_000),
		LondonBlock:         big.NewInt(12_965_000),
		ArrowGlacierBlock:   big.NewInt(13_773_000),
		Ethash:              new(EthashConfig),
	}

	// RopstenChainConfig contains the chain parameters to run a node on the Ropsten test network.
	RopstenChainConfig = &ChainConfig{
		ChainName:           RopstenChainName,
		ChainID:             big.NewInt(3),
		Consensus:           EtHashConsensus,
		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(1_700_000),
		ConstantinopleBlock: big.NewInt(4_230_000),
		PetersburgBlock:     big.NewInt(4_939_394),
		IstanbulBlock:       big.NewInt(6_485_846),
		MuirGlacierBlock:    big.NewInt(7_117_117),
		BerlinBlock:         big.NewInt(9_812_189),
		LondonBlock:         big.NewInt(10_499_401),
		Ethash:              new(EthashConfig),
	}

	// RinkebyChainConfig contains the chain parameters to run a node on the Rinkeby test network.
	RinkebyChainConfig = &ChainConfig{
		ChainName:           RinkebyChainName,
		ChainID:             big.NewInt(4),
		Consensus:           CliqueConsensus,
		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(1_035_301),
		ConstantinopleBlock: big.NewInt(3_660_663),
		PetersburgBlock:     big.NewInt(4_321_234),
		IstanbulBlock:       big.NewInt(5_435_345),
		MuirGlacierBlock:    nil,
		BerlinBlock:         big.NewInt(8_290_928),
		LondonBlock:         big.NewInt(8_897_988),
		Clique: &CliqueConfig{
			Period: 15,
			Epoch:  30000,
		},
	}

	// GoerliChainConfig contains the chain parameters to run a node on the Görli test network.
	GoerliChainConfig = &ChainConfig{
		ChainName:           GoerliChainName,
		ChainID:             big.NewInt(5),
		Consensus:           CliqueConsensus,
		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:       big.NewInt(1_561_651),
		MuirGlacierBlock:    nil,
		BerlinBlock:         big.NewInt(4_460_644),
		LondonBlock:         big.NewInt(5_062_605),
		Clique: &CliqueConfig{
			Period: 15,
			Epoch:  30000,
		},
	}

	// MainnetChainConfig is the chain parameters to run a PoW dev net to test Erigon mining
	ErigonChainConfig = &ChainConfig{
		ChainName:           ErigonMineName,
		ChainID:             new(big.Int).SetBytes([]byte("erigon-mine")),
		Consensus:           EtHashConsensus,
		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:       big.NewInt(0),
		MuirGlacierBlock:    big.NewInt(0),
		BerlinBlock:         big.NewInt(0),
		LondonBlock:         nil,
		ArrowGlacierBlock:   nil,
		Ethash:              new(EthashConfig),
	}

	SokolChainConfig = &ChainConfig{
		ChainName:      SokolChainName,
		ChainID:        big.NewInt(77),
		Consensus:      AuRaConsensus,
		HomesteadBlock: big.NewInt(0),
		DAOForkBlock:   nil,
		DAOForkSupport: false,
		EIP150Block:    big.NewInt(0),
		EIP155Block:    big.NewInt(0),
		EIP158Block:    big.NewInt(0),
		/*
		   eip150_transition: 0,
		   eip155_transition: 0,
		   eip160_transition: 0,
		   eip161abc_transition: 0,
		   eip161d_transition: 0,
		   //eip658_transition: 0,
		   validate_receipts_transition: 0,
		   validate_chain_id_transition: 0,
		   //eip140_transition: 0,
		   //eip211_transition: 0,
		   //eip214_transition: 0,
		*/

		/*
							"eip140Transition": "0x0",  in Byzantium
							"eip211Transition": "0x0",  in Byzantium
							"eip214Transition": "0x0",  in Byzantium
							"eip658Transition": "0x0",  in Byzantium
			Byzantium also has EIP-100, EIP-196, EIP-197, EIP-198, EIP-649

							"eip145Transition": 6464300,  in Constantinople
							"eip1014Transition": 6464300, in Constantinople
							"eip1052Transition": 6464300, in Constantinople
							"eip1283Transition": 6464300, in Constantinople
			Constantinople also has EIP-1234 (bomb)

							"eip1283DisableTransition": 7026400, in Petersburg
			Petersburg has nothing else

							"eip1283ReenableTransition": 12095200, ????

							"eip1344Transition": 12095200, in Istanbul
							"eip1706Transition": 12095200,  ???? [EIP-2200] has superseded [EIP-1706]
							"eip1884Transition": 12095200, in Istanbul
							"eip2028Transition": 12095200, in Istanbul
			Istanbul also has 152, 1108, 2200

							"eip2929Transition": 21050600, in Berlin ?
							"eip2930Transition": 21050600  in Berlin ?
			Berlin also has  663, 1057, 1380, 1702, 1962, 1985, 2045, 2046
			London : not in list
		*/
		ByzantiumBlock:      big.NewInt(0),
		ConstantinopleBlock: big.NewInt(6464300),
		PetersburgBlock:     big.NewInt(7026400),
		IstanbulBlock:       big.NewInt(12095200),
		MuirGlacierBlock:    nil,
		BerlinBlock:         big.NewInt(21050600),
		//LondonBlock:         big.NewInt(21050600),
		ArrowGlacierBlock: nil,
		Aura:              &AuRaConfig{},
	}

	KovanChainConfig = &ChainConfig{
		ChainName:           KovanChainName,
		ChainID:             big.NewInt(42),
		Consensus:           AuRaConsensus,
		HomesteadBlock:      big.NewInt(0),
		DAOForkBlock:        nil,
		DAOForkSupport:      false,
		EIP150Block:         big.NewInt(0),
		EIP155Block:         big.NewInt(0),
		EIP158Block:         big.NewInt(0),
		ByzantiumBlock:      big.NewInt(5067000),
		ConstantinopleBlock: big.NewInt(9200000),
		PetersburgBlock:     big.NewInt(10255201),
		IstanbulBlock:       big.NewInt(14111141),
		MuirGlacierBlock:    nil,
		BerlinBlock:         big.NewInt(24770900),
		LondonBlock:         big.NewInt(26741100),
		ArrowGlacierBlock:   nil,
		Aura:                &AuRaConfig{},
	}

	FermionChainConfig = &ChainConfig{
		ChainName:           FermionChainName,
		ChainID:             big.NewInt(1212120),
		Consensus:           CliqueConsensus,
		HomesteadBlock:      big.NewInt(0),
		DAOForkBlock:        nil,
		DAOForkSupport:      false,
		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:       big.NewInt(0),
		MuirGlacierBlock:    big.NewInt(0),
		BerlinBlock:         big.NewInt(0),
		LondonBlock:         big.NewInt(0),
		ArrowGlacierBlock:   nil,
		Clique: &CliqueConfig{
			Period: 15,
			Epoch:  30000,
		},
	}

	// AllEthashProtocolChanges contains every protocol change (EIPs) introduced
	// and accepted by the Ethereum core developers into the Ethash consensus.
	AllEthashProtocolChanges = &ChainConfig{
		ChainID:             big.NewInt(1337),
		Consensus:           EtHashConsensus,
		HomesteadBlock:      big.NewInt(0),
		DAOForkBlock:        nil,
		DAOForkSupport:      false,
		EIP150Block:         big.NewInt(0),
		EIP150Hash:          common.Hash{},
		EIP155Block:         big.NewInt(0),
		EIP158Block:         big.NewInt(0),
		ByzantiumBlock:      big.NewInt(0),
		ConstantinopleBlock: big.NewInt(0),
		PetersburgBlock:     big.NewInt(0),
		IstanbulBlock:       big.NewInt(0),
		MuirGlacierBlock:    big.NewInt(0),
		BerlinBlock:         big.NewInt(0),
		LondonBlock:         nil,
		ArrowGlacierBlock:   nil,
		Ethash:              new(EthashConfig),
		Clique:              nil,
	}

	// AllCliqueProtocolChanges contains every protocol change (EIPs) introduced
	// and accepted by the Ethereum core developers into the Clique consensus.
	AllCliqueProtocolChanges = &ChainConfig{
		ChainID:             big.NewInt(1337),
		Consensus:           CliqueConsensus,
		HomesteadBlock:      big.NewInt(0),
		DAOForkBlock:        nil,
		DAOForkSupport:      false,
		EIP150Block:         big.NewInt(0),
		EIP150Hash:          common.Hash{},
		EIP155Block:         big.NewInt(0),
		EIP158Block:         big.NewInt(0),
		ByzantiumBlock:      big.NewInt(0),
		ConstantinopleBlock: big.NewInt(0),
		PetersburgBlock:     big.NewInt(0),
		IstanbulBlock:       big.NewInt(0),
		MuirGlacierBlock:    big.NewInt(0),
		BerlinBlock:         big.NewInt(0),
		LondonBlock:         big.NewInt(0),
		ArrowGlacierBlock:   nil,
		Ethash:              nil,
		Clique:              &CliqueConfig{Period: 0, Epoch: 30000},
	}

	CliqueSnapshot = NewSnapshotConfig(10, 1024, 16384, true, "")

	TestChainConfig = &ChainConfig{
		ChainID:             big.NewInt(1),
		Consensus:           EtHashConsensus,
		HomesteadBlock:      big.NewInt(0),
		DAOForkBlock:        nil,
		DAOForkSupport:      false,
		EIP150Block:         big.NewInt(0),
		EIP150Hash:          common.Hash{},
		EIP155Block:         big.NewInt(0),
		EIP158Block:         big.NewInt(0),
		ByzantiumBlock:      big.NewInt(0),
		ConstantinopleBlock: big.NewInt(0),
		PetersburgBlock:     big.NewInt(0),
		IstanbulBlock:       big.NewInt(0),
		MuirGlacierBlock:    big.NewInt(0),
		BerlinBlock:         big.NewInt(0),
		LondonBlock:         nil,
		ArrowGlacierBlock:   nil,
		Ethash:              new(EthashConfig),
		Clique:              nil,
	}

	TestChainAuraConfig = &ChainConfig{
		ChainID:             big.NewInt(1),
		Consensus:           AuRaConsensus,
		HomesteadBlock:      big.NewInt(0),
		DAOForkBlock:        nil,
		DAOForkSupport:      false,
		EIP150Block:         big.NewInt(0),
		EIP150Hash:          common.Hash{},
		EIP155Block:         big.NewInt(0),
		EIP158Block:         big.NewInt(0),
		ByzantiumBlock:      big.NewInt(0),
		ConstantinopleBlock: big.NewInt(0),
		PetersburgBlock:     big.NewInt(0),
		IstanbulBlock:       big.NewInt(0),
		MuirGlacierBlock:    big.NewInt(0),
		BerlinBlock:         big.NewInt(0),
		LondonBlock:         nil,
		ArrowGlacierBlock:   nil,
		Aura:                &AuRaConfig{},
	}

	TestRules = TestChainConfig.Rules(0)
)

// 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 {
	ChainName string
	ChainID   *big.Int `json:"chainId"` // chainId identifies the current chain and is used for replay protection

	Consensus ConsensusType `json:"consensus,omitempty"` // aura, ethash or clique

	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)
	MuirGlacierBlock    *big.Int `json:"muirGlacierBlock,omitempty"`    // EIP-2384 (bomb delay) switch block (nil = no fork, 0 = already activated)
	BerlinBlock         *big.Int `json:"berlinBlock,omitempty"`         // Berlin switch block (nil = no fork, 0 = already on berlin)
	LondonBlock         *big.Int `json:"londonBlock,omitempty"`         // London switch block (nil = no fork, 0 = already on london)
	ArrowGlacierBlock   *big.Int `json:"arrowGlacierBlock,omitempty"`   // EIP-4345 (bomb delay) switch block (nil = no fork, 0 = already activated)

	// EIP-3675: Upgrade consensus to Proof-of-Stake
	TerminalTotalDifficulty *big.Int `json:"terminalTotalDifficulty,omitempty"` // The merge happens when terminal total difficulty is reached
	// Various consensus engines
	Ethash *EthashConfig `json:"ethash,omitempty"`
	Clique *CliqueConfig `json:"clique,omitempty"`
	Aura   *AuRaConfig   `json:"aura,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
}

// AuRaConfig is the consensus engine configs for proof-of-authority based sealing.
type AuRaConfig struct {
	DBPath    string
	InMemory  bool
	Etherbase common.Address // same as miner etherbase
}

// 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, Muir Glacier: %v, Berlin: %v, London: %v, Arrow Glacier: %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,
		c.MuirGlacierBlock,
		c.BerlinBlock,
		c.LondonBlock,
		c.ArrowGlacierBlock,
		engine,
	)
}

func (c *ChainConfig) IsHeaderWithSeal() bool {
	return c.Consensus == AuRaConsensus
}

type SnapshotConfig struct {
	CheckpointInterval uint64 // Number of blocks after which to save the vote snapshot to the database
	InmemorySnapshots  int    // Number of recent vote snapshots to keep in memory
	InmemorySignatures int    // Number of recent block signatures to keep in memory
	DBPath             string
	InMemory           bool
}

const cliquePath = "clique"

func NewSnapshotConfig(checkpointInterval uint64, inmemorySnapshots int, inmemorySignatures int, inmemory bool, dbPath string) *SnapshotConfig {
	if len(dbPath) == 0 {
		dbPath = paths.DefaultDataDir()
	}

	return &SnapshotConfig{
		checkpointInterval,
		inmemorySnapshots,
		inmemorySignatures,
		path.Join(dbPath, cliquePath),
		inmemory,
	}
}

// IsHomestead returns whether num is either equal to the homestead block or greater.
func (c *ChainConfig) IsHomestead(num uint64) 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 uint64) 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 uint64) 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 uint64) 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 uint64) 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 uint64) 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 uint64) bool {
	return isForked(c.ConstantinopleBlock, num)
}

// IsMuirGlacier returns whether num is either equal to the Muir Glacier (EIP-2384) fork block or greater.
func (c *ChainConfig) IsMuirGlacier(num uint64) bool {
	return isForked(c.MuirGlacierBlock, 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 uint64) 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 uint64) bool {
	return isForked(c.IstanbulBlock, num)
}

// IsBerlin returns whether num is either equal to the Berlin fork block or greater.
func (c *ChainConfig) IsBerlin(num uint64) bool {
	return isForked(c.BerlinBlock, num)
}

// IsLondon returns whether num is either equal to the London fork block or greater.
func (c *ChainConfig) IsLondon(num uint64) bool {
	return isForked(c.LondonBlock, num)
}

// IsArrowGlacier returns whether num is either equal to the Arrow Glacier (EIP-4345) fork block or greater.
func (c *ChainConfig) IsArrowGlacier(num uint64) bool {
	return isForked(c.ArrowGlacierBlock, 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 := 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 = err.RewindTo
	}
	return lasterr
}

// CheckConfigForkOrder checks that we don't "skip" any forks, geth isn't pluggable enough
// to guarantee that forks can be implemented in a different order than on official networks
func (c *ChainConfig) CheckConfigForkOrder() error {
	if c != nil && c.ChainID != nil && c.ChainID.Uint64() == 77 {
		return nil
	}
	type fork struct {
		name     string
		block    *big.Int
		optional bool // if true, the fork may be nil and next fork is still allowed
	}
	var lastFork fork
	for _, cur := range []fork{
		{name: "homesteadBlock", block: c.HomesteadBlock},
		{name: "daoForkBlock", block: c.DAOForkBlock, optional: true},
		{name: "eip150Block", block: c.EIP150Block},
		{name: "eip155Block", block: c.EIP155Block},
		{name: "eip158Block", block: c.EIP158Block},
		{name: "byzantiumBlock", block: c.ByzantiumBlock},
		{name: "constantinopleBlock", block: c.ConstantinopleBlock},
		{name: "petersburgBlock", block: c.PetersburgBlock},
		{name: "istanbulBlock", block: c.IstanbulBlock},
		{name: "muirGlacierBlock", block: c.MuirGlacierBlock, optional: true},
		{name: "berlinBlock", block: c.BerlinBlock},
		{name: "londonBlock", block: c.LondonBlock},
		{name: "arrowGlacierBlock", block: c.ArrowGlacierBlock, optional: true},
	} {
		if lastFork.name != "" {
			// Next one must be higher number
			if lastFork.block == nil && cur.block != nil {
				return fmt.Errorf("unsupported fork ordering: %v not enabled, but %v enabled at %v",
					lastFork.name, cur.name, cur.block)
			}
			if lastFork.block != nil && cur.block != nil {
				if lastFork.block.Cmp(cur.block) > 0 {
					return fmt.Errorf("unsupported fork ordering: %v enabled at %v, but %v enabled at %v",
						lastFork.name, lastFork.block, cur.name, cur.block)
				}
			}
			// If it was optional and not set, then ignore it
		}
		if !cur.optional || cur.block != nil {
			lastFork = cur
		}
	}
	return nil
}

func (c *ChainConfig) checkCompatible(newcfg *ChainConfig, head uint64) *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) {
		// the only case where we allow Petersburg to be set in the past is if it is equal to Constantinople
		// mainly to satisfy fork ordering requirements which state that Petersburg fork be set if Constantinople fork is set
		if isForkIncompatible(c.ConstantinopleBlock, 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.MuirGlacierBlock, newcfg.MuirGlacierBlock, head) {
		return newCompatError("Muir Glacier fork block", c.MuirGlacierBlock, newcfg.MuirGlacierBlock)
	}
	if isForkIncompatible(c.BerlinBlock, newcfg.BerlinBlock, head) {
		return newCompatError("Berlin fork block", c.BerlinBlock, newcfg.BerlinBlock)
	}
	if isForkIncompatible(c.LondonBlock, newcfg.LondonBlock, head) {
		return newCompatError("London fork block", c.LondonBlock, newcfg.LondonBlock)
	}
	if isForkIncompatible(c.ArrowGlacierBlock, newcfg.ArrowGlacierBlock, head) {
		return newCompatError("Arrow Glacier fork block", c.ArrowGlacierBlock, newcfg.ArrowGlacierBlock)
	}
	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 *big.Int, head uint64) 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 *big.Int, head uint64) bool {
	if s == nil {
		return false
	}
	return s.Uint64() <= head
}

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
	IsBerlin, IsLondon                                      bool
}

// Rules ensures c's ChainID is not nil.
func (c *ChainConfig) Rules(num uint64) 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),
		IsBerlin:         c.IsBerlin(num),
		IsLondon:         c.IsLondon(num),
	}
}

This should probably left as `nil` and not zero (which would mean the this fork is activated straight away)