610 lines
24 KiB
Go
610 lines
24 KiB
Go
// Copyright (c) 2014-2016 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package chaincfg
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import (
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"errors"
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"math"
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"math/big"
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"time"
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/btcsuite/btcd/wire"
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)
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// These variables are the chain proof-of-work limit parameters for each default
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// network.
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var (
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// bigOne is 1 represented as a big.Int. It is defined here to avoid
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// the overhead of creating it multiple times.
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bigOne = big.NewInt(1)
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// mainPowLimit is the highest proof of work value a Bitcoin block can
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// have for the main network. It is the value 2^224 - 1.
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mainPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 224), bigOne)
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// regressionPowLimit is the highest proof of work value a Bitcoin block
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// can have for the regression test network. It is the value 2^255 - 1.
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regressionPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 255), bigOne)
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// testNet3PowLimit is the highest proof of work value a Bitcoin block
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// can have for the test network (version 3). It is the value
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// 2^224 - 1.
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testNet3PowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 224), bigOne)
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// simNetPowLimit is the highest proof of work value a Bitcoin block
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// can have for the simulation test network. It is the value 2^255 - 1.
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simNetPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 255), bigOne)
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)
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// Checkpoint identifies a known good point in the block chain. Using
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// checkpoints allows a few optimizations for old blocks during initial download
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// and also prevents forks from old blocks.
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//
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// Each checkpoint is selected based upon several factors. See the
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// documentation for blockchain.IsCheckpointCandidate for details on the
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// selection criteria.
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type Checkpoint struct {
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Height int32
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Hash *chainhash.Hash
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}
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// DNSSeed identifies a DNS seed.
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type DNSSeed struct {
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// Host defines the hostname of the seed.
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Host string
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// HasFiltering defines whether the seed supports filtering
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// by service flags (wire.ServiceFlag).
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HasFiltering bool
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}
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// ConsensusDeployment defines details related to a specific consensus rule
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// change that is voted in. This is part of BIP0009.
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type ConsensusDeployment struct {
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// BitNumber defines the specific bit number within the block version
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// this particular soft-fork deployment refers to.
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BitNumber uint8
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// StartTime is the median block time after which voting on the
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// deployment starts.
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StartTime uint64
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// ExpireTime is the median block time after which the attempted
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// deployment expires.
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ExpireTime uint64
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}
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// Constants that define the deployment offset in the deployments field of the
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// parameters for each deployment. This is useful to be able to get the details
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// of a specific deployment by name.
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const (
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// DeploymentTestDummy defines the rule change deployment ID for testing
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// purposes.
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DeploymentTestDummy = iota
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// NOTE: DefinedDeployments must always come last since it is used to
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// determine how many defined deployments there currently are.
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// DefinedDeployments is the number of currently defined deployments.
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DefinedDeployments
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)
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// Params defines a Bitcoin network by its parameters. These parameters may be
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// used by Bitcoin applications to differentiate networks as well as addresses
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// and keys for one network from those intended for use on another network.
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type Params struct {
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// Name defines a human-readable identifier for the network.
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Name string
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// Net defines the magic bytes used to identify the network.
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Net wire.BitcoinNet
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// DefaultPort defines the default peer-to-peer port for the network.
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DefaultPort string
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// DNSSeeds defines a list of DNS seeds for the network that are used
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// as one method to discover peers.
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DNSSeeds []DNSSeed
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// GenesisBlock defines the first block of the chain.
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GenesisBlock *wire.MsgBlock
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// GenesisHash is the starting block hash.
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GenesisHash *chainhash.Hash
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// PowLimit defines the highest allowed proof of work value for a block
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// as a uint256.
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PowLimit *big.Int
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// PowLimitBits defines the highest allowed proof of work value for a
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// block in compact form.
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PowLimitBits uint32
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// These fields define the block heights at which the specified softfork
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// BIP became active.
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BIP0034Height int32
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BIP0065Height int32
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BIP0066Height int32
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// CoinbaseMaturity is the number of blocks required before newly mined
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// coins (coinbase transactions) can be spent.
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CoinbaseMaturity uint16
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// SubsidyReductionInterval is the interval of blocks before the subsidy
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// is reduced.
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SubsidyReductionInterval int32
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// TargetTimespan is the desired amount of time that should elapse
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// before the block difficulty requirement is examined to determine how
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// it should be changed in order to maintain the desired block
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// generation rate.
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TargetTimespan time.Duration
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// TargetTimePerBlock is the desired amount of time to generate each
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// block.
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TargetTimePerBlock time.Duration
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// RetargetAdjustmentFactor is the adjustment factor used to limit
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// the minimum and maximum amount of adjustment that can occur between
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// difficulty retargets.
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RetargetAdjustmentFactor int64
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// ReduceMinDifficulty defines whether the network should reduce the
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// minimum required difficulty after a long enough period of time has
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// passed without finding a block. This is really only useful for test
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// networks and should not be set on a main network.
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ReduceMinDifficulty bool
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// MinDiffReductionTime is the amount of time after which the minimum
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// required difficulty should be reduced when a block hasn't been found.
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//
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// NOTE: This only applies if ReduceMinDifficulty is true.
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MinDiffReductionTime time.Duration
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// GenerateSupported specifies whether or not CPU mining is allowed.
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GenerateSupported bool
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// Checkpoints ordered from oldest to newest.
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Checkpoints []Checkpoint
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// These fields are related to voting on consensus rule changes as
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// defined by BIP0009.
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//
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// RuleChangeActivationThreshold is the number of blocks in a threshold
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// state retarget window for which a positive vote for a rule change
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// must be cast in order to lock in a rule change. It should typically
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// be 95% for the main network and 75% for test networks.
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//
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// MinerConfirmationWindow is the number of blocks in each threshold
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// state retarget window.
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//
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// Deployments define the specific consensus rule changes to be voted
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// on.
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RuleChangeActivationThreshold uint32
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MinerConfirmationWindow uint32
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Deployments [DefinedDeployments]ConsensusDeployment
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// Mempool parameters
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RelayNonStdTxs bool
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// Address encoding magics
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PubKeyHashAddrID byte // First byte of a P2PKH address
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ScriptHashAddrID byte // First byte of a P2SH address
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PrivateKeyID byte // First byte of a WIF private key
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// BIP32 hierarchical deterministic extended key magics
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HDPrivateKeyID [4]byte
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HDPublicKeyID [4]byte
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// BIP44 coin type used in the hierarchical deterministic path for
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// address generation.
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HDCoinType uint32
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}
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// MainNetParams defines the network parameters for the main Bitcoin network.
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var MainNetParams = Params{
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Name: "mainnet",
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Net: wire.MainNet,
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DefaultPort: "8333",
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DNSSeeds: []DNSSeed{
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{"seed.bitcoin.sipa.be", true},
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{"dnsseed.bluematt.me", true},
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{"dnsseed.bitcoin.dashjr.org", false},
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{"seed.bitcoinstats.com", true},
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{"seed.bitnodes.io", false},
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{"bitseed.xf2.org", false},
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{"seed.bitcoin.jonasschnelli.ch", true},
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},
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// Chain parameters
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GenesisBlock: &genesisBlock,
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GenesisHash: &genesisHash,
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PowLimit: mainPowLimit,
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PowLimitBits: 0x1d00ffff,
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BIP0034Height: 227931, // 000000000000024b89b42a942fe0d9fea3bb44ab7bd1b19115dd6a759c0808b8
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BIP0065Height: 388381, // 000000000000000004c2b624ed5d7756c508d90fd0da2c7c679febfa6c4735f0
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BIP0066Height: 363725, // 00000000000000000379eaa19dce8c9b722d46ae6a57c2f1a988119488b50931
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CoinbaseMaturity: 100,
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SubsidyReductionInterval: 210000,
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TargetTimespan: time.Hour * 24 * 14, // 14 days
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TargetTimePerBlock: time.Minute * 10, // 10 minutes
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RetargetAdjustmentFactor: 4, // 25% less, 400% more
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ReduceMinDifficulty: false,
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MinDiffReductionTime: 0,
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GenerateSupported: false,
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// Checkpoints ordered from oldest to newest.
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Checkpoints: []Checkpoint{
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{11111, newHashFromStr("0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d")},
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{33333, newHashFromStr("000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6")},
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{74000, newHashFromStr("0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20")},
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{105000, newHashFromStr("00000000000291ce28027faea320c8d2b054b2e0fe44a773f3eefb151d6bdc97")},
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{134444, newHashFromStr("00000000000005b12ffd4cd315cd34ffd4a594f430ac814c91184a0d42d2b0fe")},
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{168000, newHashFromStr("000000000000099e61ea72015e79632f216fe6cb33d7899acb35b75c8303b763")},
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{193000, newHashFromStr("000000000000059f452a5f7340de6682a977387c17010ff6e6c3bd83ca8b1317")},
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{210000, newHashFromStr("000000000000048b95347e83192f69cf0366076336c639f9b7228e9ba171342e")},
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{216116, newHashFromStr("00000000000001b4f4b433e81ee46494af945cf96014816a4e2370f11b23df4e")},
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{225430, newHashFromStr("00000000000001c108384350f74090433e7fcf79a606b8e797f065b130575932")},
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{250000, newHashFromStr("000000000000003887df1f29024b06fc2200b55f8af8f35453d7be294df2d214")},
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{267300, newHashFromStr("000000000000000a83fbd660e918f218bf37edd92b748ad940483c7c116179ac")},
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{279000, newHashFromStr("0000000000000001ae8c72a0b0c301f67e3afca10e819efa9041e458e9bd7e40")},
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{300255, newHashFromStr("0000000000000000162804527c6e9b9f0563a280525f9d08c12041def0a0f3b2")},
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{319400, newHashFromStr("000000000000000021c6052e9becade189495d1c539aa37c58917305fd15f13b")},
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{343185, newHashFromStr("0000000000000000072b8bf361d01a6ba7d445dd024203fafc78768ed4368554")},
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{352940, newHashFromStr("000000000000000010755df42dba556bb72be6a32f3ce0b6941ce4430152c9ff")},
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{382320, newHashFromStr("00000000000000000a8dc6ed5b133d0eb2fd6af56203e4159789b092defd8ab2")},
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},
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// Consensus rule change deployments.
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//
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// The miner confirmation window is defined as:
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// target proof of work timespan / target proof of work spacing
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RuleChangeActivationThreshold: 1916, // 95% of MinerConfirmationWindow
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MinerConfirmationWindow: 2016, //
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Deployments: [DefinedDeployments]ConsensusDeployment{
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DeploymentTestDummy: {
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BitNumber: 28,
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StartTime: 1199145601, // January 1, 2008 UTC
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ExpireTime: 1230767999, // December 31, 2008 UTC
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},
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},
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// Mempool parameters
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RelayNonStdTxs: false,
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// Address encoding magics
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PubKeyHashAddrID: 0x00, // starts with 1
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ScriptHashAddrID: 0x05, // starts with 3
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PrivateKeyID: 0x80, // starts with 5 (uncompressed) or K (compressed)
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// BIP32 hierarchical deterministic extended key magics
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HDPrivateKeyID: [4]byte{0x04, 0x88, 0xad, 0xe4}, // starts with xprv
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HDPublicKeyID: [4]byte{0x04, 0x88, 0xb2, 0x1e}, // starts with xpub
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// BIP44 coin type used in the hierarchical deterministic path for
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// address generation.
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HDCoinType: 0,
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}
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// RegressionNetParams defines the network parameters for the regression test
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// Bitcoin network. Not to be confused with the test Bitcoin network (version
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// 3), this network is sometimes simply called "testnet".
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var RegressionNetParams = Params{
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Name: "regtest",
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Net: wire.TestNet,
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DefaultPort: "18444",
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DNSSeeds: []DNSSeed{},
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// Chain parameters
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GenesisBlock: ®TestGenesisBlock,
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GenesisHash: ®TestGenesisHash,
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PowLimit: regressionPowLimit,
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PowLimitBits: 0x207fffff,
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CoinbaseMaturity: 100,
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BIP0034Height: 100000000, // Not active - Permit ver 1 blocks
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BIP0065Height: 1351, // Used by regression tests
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BIP0066Height: 1251, // Used by regression tests
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SubsidyReductionInterval: 150,
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TargetTimespan: time.Hour * 24 * 14, // 14 days
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TargetTimePerBlock: time.Minute * 10, // 10 minutes
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RetargetAdjustmentFactor: 4, // 25% less, 400% more
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ReduceMinDifficulty: true,
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MinDiffReductionTime: time.Minute * 20, // TargetTimePerBlock * 2
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GenerateSupported: true,
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// Checkpoints ordered from oldest to newest.
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Checkpoints: nil,
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// Consensus rule change deployments.
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//
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// The miner confirmation window is defined as:
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// target proof of work timespan / target proof of work spacing
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RuleChangeActivationThreshold: 108, // 75% of MinerConfirmationWindow
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MinerConfirmationWindow: 144,
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Deployments: [DefinedDeployments]ConsensusDeployment{
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DeploymentTestDummy: {
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BitNumber: 28,
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StartTime: 0, // Always available for vote
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ExpireTime: math.MaxInt64, // Never expires
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},
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},
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// Mempool parameters
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RelayNonStdTxs: true,
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// Address encoding magics
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PubKeyHashAddrID: 0x6f, // starts with m or n
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ScriptHashAddrID: 0xc4, // starts with 2
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PrivateKeyID: 0xef, // starts with 9 (uncompressed) or c (compressed)
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// BIP32 hierarchical deterministic extended key magics
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HDPrivateKeyID: [4]byte{0x04, 0x35, 0x83, 0x94}, // starts with tprv
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HDPublicKeyID: [4]byte{0x04, 0x35, 0x87, 0xcf}, // starts with tpub
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// BIP44 coin type used in the hierarchical deterministic path for
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// address generation.
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HDCoinType: 1,
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}
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// TestNet3Params defines the network parameters for the test Bitcoin network
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// (version 3). Not to be confused with the regression test network, this
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// network is sometimes simply called "testnet".
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var TestNet3Params = Params{
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Name: "testnet3",
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Net: wire.TestNet3,
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DefaultPort: "18333",
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DNSSeeds: []DNSSeed{
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{"testnet-seed.bitcoin.jonasschnelli.ch", true},
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{"testnet-seed.bitcoin.schildbach.de", false},
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{"seed.tbtc.petertodd.org", true},
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{"testnet-seed.bluematt.me", false},
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},
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// Chain parameters
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GenesisBlock: &testNet3GenesisBlock,
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GenesisHash: &testNet3GenesisHash,
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PowLimit: testNet3PowLimit,
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PowLimitBits: 0x1d00ffff,
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BIP0034Height: 21111, // 0000000023b3a96d3484e5abb3755c413e7d41500f8e2a5c3f0dd01299cd8ef8
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BIP0065Height: 581885, // 00000000007f6655f22f98e72ed80d8b06dc761d5da09df0fa1dc4be4f861eb6
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BIP0066Height: 330776, // 000000002104c8c45e99a8853285a3b592602a3ccde2b832481da85e9e4ba182
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CoinbaseMaturity: 100,
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SubsidyReductionInterval: 210000,
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TargetTimespan: time.Hour * 24 * 14, // 14 days
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TargetTimePerBlock: time.Minute * 10, // 10 minutes
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RetargetAdjustmentFactor: 4, // 25% less, 400% more
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ReduceMinDifficulty: true,
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MinDiffReductionTime: time.Minute * 20, // TargetTimePerBlock * 2
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GenerateSupported: false,
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// Checkpoints ordered from oldest to newest.
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Checkpoints: []Checkpoint{
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{546, newHashFromStr("000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70")},
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{100000, newHashFromStr("00000000009e2958c15ff9290d571bf9459e93b19765c6801ddeccadbb160a1e")},
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{200000, newHashFromStr("0000000000287bffd321963ef05feab753ebe274e1d78b2fd4e2bfe9ad3aa6f2")},
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{300001, newHashFromStr("0000000000004829474748f3d1bc8fcf893c88be255e6d7f571c548aff57abf4")},
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{400002, newHashFromStr("0000000005e2c73b8ecb82ae2dbc2e8274614ebad7172b53528aba7501f5a089")},
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{500011, newHashFromStr("00000000000929f63977fbac92ff570a9bd9e7715401ee96f2848f7b07750b02")},
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{600002, newHashFromStr("000000000001f471389afd6ee94dcace5ccc44adc18e8bff402443f034b07240")},
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{700000, newHashFromStr("000000000000406178b12a4dea3b27e13b3c4fe4510994fd667d7c1e6a3f4dc1")},
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{800010, newHashFromStr("000000000017ed35296433190b6829db01e657d80631d43f5983fa403bfdb4c1")},
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{900000, newHashFromStr("0000000000356f8d8924556e765b7a94aaebc6b5c8685dcfa2b1ee8b41acd89b")},
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{1000007, newHashFromStr("00000000001ccb893d8a1f25b70ad173ce955e5f50124261bbbc50379a612ddf")},
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},
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// Consensus rule change deployments.
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//
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// The miner confirmation window is defined as:
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// target proof of work timespan / target proof of work spacing
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RuleChangeActivationThreshold: 1512, // 75% of MinerConfirmationWindow
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MinerConfirmationWindow: 2016,
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Deployments: [DefinedDeployments]ConsensusDeployment{
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DeploymentTestDummy: {
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BitNumber: 28,
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StartTime: 1199145601, // January 1, 2008 UTC
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ExpireTime: 1230767999, // December 31, 2008 UTC
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},
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},
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// Mempool parameters
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RelayNonStdTxs: true,
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// Address encoding magics
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PubKeyHashAddrID: 0x6f, // starts with m or n
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ScriptHashAddrID: 0xc4, // starts with 2
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PrivateKeyID: 0xef, // starts with 9 (uncompressed) or c (compressed)
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// BIP32 hierarchical deterministic extended key magics
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HDPrivateKeyID: [4]byte{0x04, 0x35, 0x83, 0x94}, // starts with tprv
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HDPublicKeyID: [4]byte{0x04, 0x35, 0x87, 0xcf}, // starts with tpub
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// BIP44 coin type used in the hierarchical deterministic path for
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// address generation.
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HDCoinType: 1,
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}
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// SimNetParams defines the network parameters for the simulation test Bitcoin
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// network. This network is similar to the normal test network except it is
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// intended for private use within a group of individuals doing simulation
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// testing. The functionality is intended to differ in that the only nodes
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// which are specifically specified are used to create the network rather than
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// following normal discovery rules. This is important as otherwise it would
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// just turn into another public testnet.
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var SimNetParams = Params{
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Name: "simnet",
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Net: wire.SimNet,
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DefaultPort: "18555",
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DNSSeeds: []DNSSeed{}, // NOTE: There must NOT be any seeds.
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// Chain parameters
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GenesisBlock: &simNetGenesisBlock,
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GenesisHash: &simNetGenesisHash,
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PowLimit: simNetPowLimit,
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PowLimitBits: 0x207fffff,
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BIP0034Height: 0, // Always active on simnet
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BIP0065Height: 0, // Always active on simnet
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BIP0066Height: 0, // Always active on simnet
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CoinbaseMaturity: 100,
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SubsidyReductionInterval: 210000,
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TargetTimespan: time.Hour * 24 * 14, // 14 days
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TargetTimePerBlock: time.Minute * 10, // 10 minutes
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RetargetAdjustmentFactor: 4, // 25% less, 400% more
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ReduceMinDifficulty: true,
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MinDiffReductionTime: time.Minute * 20, // TargetTimePerBlock * 2
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GenerateSupported: true,
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// Checkpoints ordered from oldest to newest.
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Checkpoints: nil,
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// Consensus rule change deployments.
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//
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// The miner confirmation window is defined as:
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// target proof of work timespan / target proof of work spacing
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RuleChangeActivationThreshold: 75, // 75% of MinerConfirmationWindow
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MinerConfirmationWindow: 100,
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Deployments: [DefinedDeployments]ConsensusDeployment{
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DeploymentTestDummy: {
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BitNumber: 28,
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StartTime: 0, // Always available for vote
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ExpireTime: math.MaxInt64, // Never expires
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},
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},
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// Mempool parameters
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RelayNonStdTxs: true,
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// Address encoding magics
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PubKeyHashAddrID: 0x3f, // starts with S
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ScriptHashAddrID: 0x7b, // starts with s
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PrivateKeyID: 0x64, // starts with 4 (uncompressed) or F (compressed)
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// BIP32 hierarchical deterministic extended key magics
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HDPrivateKeyID: [4]byte{0x04, 0x20, 0xb9, 0x00}, // starts with sprv
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HDPublicKeyID: [4]byte{0x04, 0x20, 0xbd, 0x3a}, // starts with spub
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// BIP44 coin type used in the hierarchical deterministic path for
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// address generation.
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HDCoinType: 115, // ASCII for s
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}
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var (
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// ErrDuplicateNet describes an error where the parameters for a Bitcoin
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// network could not be set due to the network already being a standard
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// network or previously-registered into this package.
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ErrDuplicateNet = errors.New("duplicate Bitcoin network")
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// ErrUnknownHDKeyID describes an error where the provided id which
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// is intended to identify the network for a hierarchical deterministic
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// private extended key is not registered.
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ErrUnknownHDKeyID = errors.New("unknown hd private extended key bytes")
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)
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var (
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registeredNets = make(map[wire.BitcoinNet]struct{})
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pubKeyHashAddrIDs = make(map[byte]struct{})
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scriptHashAddrIDs = make(map[byte]struct{})
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hdPrivToPubKeyIDs = make(map[[4]byte][]byte)
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)
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// String returns the hostname of the DNS seed in human-readable form.
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func (d DNSSeed) String() string {
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return d.Host
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}
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// Register registers the network parameters for a Bitcoin network. This may
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// error with ErrDuplicateNet if the network is already registered (either
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// due to a previous Register call, or the network being one of the default
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// networks).
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//
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// Network parameters should be registered into this package by a main package
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// as early as possible. Then, library packages may lookup networks or network
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// parameters based on inputs and work regardless of the network being standard
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// or not.
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func Register(params *Params) error {
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if _, ok := registeredNets[params.Net]; ok {
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return ErrDuplicateNet
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}
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registeredNets[params.Net] = struct{}{}
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pubKeyHashAddrIDs[params.PubKeyHashAddrID] = struct{}{}
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scriptHashAddrIDs[params.ScriptHashAddrID] = struct{}{}
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hdPrivToPubKeyIDs[params.HDPrivateKeyID] = params.HDPublicKeyID[:]
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return nil
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}
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// mustRegister performs the same function as Register except it panics if there
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// is an error. This should only be called from package init functions.
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func mustRegister(params *Params) {
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if err := Register(params); err != nil {
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panic("failed to register network: " + err.Error())
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}
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}
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// IsPubKeyHashAddrID returns whether the id is an identifier known to prefix a
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// pay-to-pubkey-hash address on any default or registered network. This is
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// used when decoding an address string into a specific address type. It is up
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// to the caller to check both this and IsScriptHashAddrID and decide whether an
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// address is a pubkey hash address, script hash address, neither, or
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// undeterminable (if both return true).
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func IsPubKeyHashAddrID(id byte) bool {
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_, ok := pubKeyHashAddrIDs[id]
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return ok
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}
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// IsScriptHashAddrID returns whether the id is an identifier known to prefix a
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// pay-to-script-hash address on any default or registered network. This is
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// used when decoding an address string into a specific address type. It is up
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// to the caller to check both this and IsPubKeyHashAddrID and decide whether an
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// address is a pubkey hash address, script hash address, neither, or
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// undeterminable (if both return true).
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func IsScriptHashAddrID(id byte) bool {
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_, ok := scriptHashAddrIDs[id]
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return ok
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}
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// HDPrivateKeyToPublicKeyID accepts a private hierarchical deterministic
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// extended key id and returns the associated public key id. When the provided
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// id is not registered, the ErrUnknownHDKeyID error will be returned.
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func HDPrivateKeyToPublicKeyID(id []byte) ([]byte, error) {
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if len(id) != 4 {
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return nil, ErrUnknownHDKeyID
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}
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var key [4]byte
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copy(key[:], id)
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pubBytes, ok := hdPrivToPubKeyIDs[key]
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if !ok {
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return nil, ErrUnknownHDKeyID
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}
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return pubBytes, nil
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}
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// newHashFromStr converts the passed big-endian hex string into a
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// chainhash.Hash. It only differs from the one available in chainhash in that
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// it panics on an error since it will only (and must only) be called with
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// hard-coded, and therefore known good, hashes.
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func newHashFromStr(hexStr string) *chainhash.Hash {
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hash, err := chainhash.NewHashFromStr(hexStr)
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if err != nil {
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// Ordinarily I don't like panics in library code since it
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// can take applications down without them having a chance to
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// recover which is extremely annoying, however an exception is
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// being made in this case because the only way this can panic
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// is if there is an error in the hard-coded hashes. Thus it
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// will only ever potentially panic on init and therefore is
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// 100% predictable.
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panic(err)
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}
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return hash
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}
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func init() {
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// Register all default networks when the package is initialized.
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mustRegister(&MainNetParams)
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mustRegister(&TestNet3Params)
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mustRegister(&RegressionNetParams)
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mustRegister(&SimNetParams)
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}
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