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params.go
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// Copyright (c) 2014-2016 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package chaincfg
import (
"encoding/binary"
"encoding/hex"
"errors"
"math/big"
"strings"
"time"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/wire"
)
// These variables are the chain proof-of-work limit parameters for each default
// network.
var (
// bigOne is 1 represented as a big.Int. It is defined here to avoid
// the overhead of creating it multiple times.
bigOne = big.NewInt(1)
// mainPowLimit is the highest proof of work value a Bitcoin block can
// have for the main network. It is the value 2^224 - 1.
mainPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 224), bigOne)
// regressionPowLimit is the highest proof of work value a Bitcoin block
// can have for the regression test network. It is the value 2^255 - 1.
regressionPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 255), bigOne)
// testNet3PowLimit is the highest proof of work value a Bitcoin block
// can have for the test network (version 3). It is the value
// 2^224 - 1.
testNet3PowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 224), bigOne)
// simNetPowLimit is the highest proof of work value a Bitcoin block
// can have for the simulation test network. It is the value 2^255 - 1.
simNetPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 255), bigOne)
// sigNetPowLimit is the highest proof of work value a bitcoin block can
// have for the signet test network. It is the value 0x0377ae << 216.
sigNetPowLimit = new(big.Int).Lsh(new(big.Int).SetInt64(0x0377ae), 216)
// DefaultSignetChallenge is the byte representation of the signet
// challenge for the default (public, Taproot enabled) signet network.
// This is the binary equivalent of the bitcoin script
// 1 03ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be430
// 0359ef5021964fe22d6f8e05b2463c9540ce96883fe3b278760f048f5189f2e6c4 2
// OP_CHECKMULTISIG
DefaultSignetChallenge, _ = hex.DecodeString(
"512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d" +
"1e086be430210359ef5021964fe22d6f8e05b2463c9540ce9688" +
"3fe3b278760f048f5189f2e6c452ae",
)
// DefaultSignetDNSSeeds is the list of seed nodes for the default
// (public, Taproot enabled) signet network.
DefaultSignetDNSSeeds = []DNSSeed{
{"178.128.221.177", false},
{"2a01:7c8:d005:390::5", false},
{"v7ajjeirttkbnt32wpy3c6w3emwnfr3fkla7hpxcfokr3ysd3kqtzmqd.onion:38333", false},
}
)
// Checkpoint identifies a known good point in the block chain. Using
// checkpoints allows a few optimizations for old blocks during initial download
// and also prevents forks from old blocks.
//
// Each checkpoint is selected based upon several factors. See the
// documentation for blockchain.IsCheckpointCandidate for details on the
// selection criteria.
type Checkpoint struct {
Height int32
Hash *chainhash.Hash
}
// DNSSeed identifies a DNS seed.
type DNSSeed struct {
// Host defines the hostname of the seed.
Host string
// HasFiltering defines whether the seed supports filtering
// by service flags (wire.ServiceFlag).
HasFiltering bool
}
// ConsensusDeployment defines details related to a specific consensus rule
// change that is voted in. This is part of BIP0009.
type ConsensusDeployment struct {
// BitNumber defines the specific bit number within the block version
// this particular soft-fork deployment refers to.
BitNumber uint8
// MinActivationHeight is an optional field that when set (default
// value being zero), modifies the traditional BIP 9 state machine by
// only transitioning from LockedIn to Active once the block height is
// greater than (or equal to) thus specified height.
MinActivationHeight uint32
// CustomActivationThreshold if set (non-zero), will _override_ the
// existing RuleChangeActivationThreshold value set at the
// network/chain level. This value divided by the active
// MinerConfirmationWindow denotes the threshold required for
// activation. A value of 1815 block denotes a 90% threshold.
CustomActivationThreshold uint32
// DeploymentStarter is used to determine if the given
// ConsensusDeployment has started or not.
DeploymentStarter ConsensusDeploymentStarter
// DeploymentEnder is used to determine if the given
// ConsensusDeployment has ended or not.
DeploymentEnder ConsensusDeploymentEnder
}
// Constants that define the deployment offset in the deployments field of the
// parameters for each deployment. This is useful to be able to get the details
// of a specific deployment by name.
const (
// DeploymentTestDummy defines the rule change deployment ID for testing
// purposes.
DeploymentTestDummy = iota
// DeploymentTestDummyMinActivation defines the rule change deployment
// ID for testing purposes. This differs from the DeploymentTestDummy
// in that it specifies the newer params the taproot fork used for
// activation: a custom threshold and a min activation height.
DeploymentTestDummyMinActivation
// DeploymentCSV defines the rule change deployment ID for the CSV
// soft-fork package. The CSV package includes the deployment of BIPS
// 68, 112, and 113.
DeploymentCSV
// DeploymentSegwit defines the rule change deployment ID for the
// Segregated Witness (segwit) soft-fork package. The segwit package
// includes the deployment of BIPS 141, 142, 144, 145, 147 and 173.
DeploymentSegwit
// DeploymentTaproot defines the rule change deployment ID for the
// Taproot (+Schnorr) soft-fork package. The taproot package includes
// the deployment of BIPS 340, 341 and 342.
DeploymentTaproot
// NOTE: DefinedDeployments must always come last since it is used to
// determine how many defined deployments there currently are.
// DefinedDeployments is the number of currently defined deployments.
DefinedDeployments
)
// Params defines a Bitcoin network by its parameters. These parameters may be
// used by Bitcoin applications to differentiate networks as well as addresses
// and keys for one network from those intended for use on another network.
type Params struct {
// Name defines a human-readable identifier for the network.
Name string
// Net defines the magic bytes used to identify the network.
Net wire.BitcoinNet
// DefaultPort defines the default peer-to-peer port for the network.
DefaultPort string
// DNSSeeds defines a list of DNS seeds for the network that are used
// as one method to discover peers.
DNSSeeds []DNSSeed
// GenesisBlock defines the first block of the chain.
GenesisBlock *wire.MsgBlock
// GenesisHash is the starting block hash.
GenesisHash *chainhash.Hash
// PowLimit defines the highest allowed proof of work value for a block
// as a uint256.
PowLimit *big.Int
// PowLimitBits defines the highest allowed proof of work value for a
// block in compact form.
PowLimitBits uint32
// These fields define the block heights at which the specified softfork
// BIP became active.
BIP0034Height int32
BIP0065Height int32
BIP0066Height int32
// CoinbaseMaturity is the number of blocks required before newly mined
// coins (coinbase transactions) can be spent.
CoinbaseMaturity uint16
// SubsidyReductionInterval is the interval of blocks before the subsidy
// is reduced.
SubsidyReductionInterval int32
// TargetTimespan is the desired amount of time that should elapse
// before the block difficulty requirement is examined to determine how
// it should be changed in order to maintain the desired block
// generation rate.
TargetTimespan time.Duration
// TargetTimePerBlock is the desired amount of time to generate each
// block.
TargetTimePerBlock time.Duration
// RetargetAdjustmentFactor is the adjustment factor used to limit
// the minimum and maximum amount of adjustment that can occur between
// difficulty retargets.
RetargetAdjustmentFactor int64
// ReduceMinDifficulty defines whether the network should reduce the
// minimum required difficulty after a long enough period of time has
// passed without finding a block. This is really only useful for test
// networks and should not be set on a main network.
ReduceMinDifficulty bool
// MinDiffReductionTime is the amount of time after which the minimum
// required difficulty should be reduced when a block hasn't been found.
//
// NOTE: This only applies if ReduceMinDifficulty is true.
MinDiffReductionTime time.Duration
// GenerateSupported specifies whether or not CPU mining is allowed.
GenerateSupported bool
// Checkpoints ordered from oldest to newest.
Checkpoints []Checkpoint
// These fields are related to voting on consensus rule changes as
// defined by BIP0009.
//
// RuleChangeActivationThreshold is the number of blocks in a threshold
// state retarget window for which a positive vote for a rule change
// must be cast in order to lock in a rule change. It should typically
// be 95% for the main network and 75% for test networks.
//
// MinerConfirmationWindow is the number of blocks in each threshold
// state retarget window.
//
// Deployments define the specific consensus rule changes to be voted
// on.
RuleChangeActivationThreshold uint32
MinerConfirmationWindow uint32
Deployments [DefinedDeployments]ConsensusDeployment
// Mempool parameters
RelayNonStdTxs bool
// Human-readable part for Bech32 encoded segwit addresses, as defined
// in BIP 173.
Bech32HRPSegwit string
// Address encoding magics
PubKeyHashAddrID byte // First byte of a P2PKH address
ScriptHashAddrID byte // First byte of a P2SH address
PrivateKeyID byte // First byte of a WIF private key
WitnessPubKeyHashAddrID byte // First byte of a P2WPKH address
WitnessScriptHashAddrID byte // First byte of a P2WSH address
// BIP32 hierarchical deterministic extended key magics
HDPrivateKeyID [4]byte
HDPublicKeyID [4]byte
// BIP44 coin type used in the hierarchical deterministic path for
// address generation.
HDCoinType uint32
}
// MainNetParams defines the network parameters for the main Bitcoin network.
var MainNetParams = Params{
Name: "mainnet",
Net: wire.MainNet,
DefaultPort: "8333",
DNSSeeds: []DNSSeed{
{"seed.bitcoin.sipa.be", true},
{"dnsseed.bluematt.me", true},
{"dnsseed.bitcoin.dashjr.org", false},
{"seed.bitcoinstats.com", true},
{"seed.bitnodes.io", false},
{"seed.bitcoin.jonasschnelli.ch", true},
},
// Chain parameters
GenesisBlock: &genesisBlock,
GenesisHash: &genesisHash,
PowLimit: mainPowLimit,
PowLimitBits: 0x1d00ffff,
BIP0034Height: 227931, // 000000000000024b89b42a942fe0d9fea3bb44ab7bd1b19115dd6a759c0808b8
BIP0065Height: 388381, // 000000000000000004c2b624ed5d7756c508d90fd0da2c7c679febfa6c4735f0
BIP0066Height: 363725, // 00000000000000000379eaa19dce8c9b722d46ae6a57c2f1a988119488b50931
CoinbaseMaturity: 100,
SubsidyReductionInterval: 210000,
TargetTimespan: time.Hour * 24 * 14, // 14 days
TargetTimePerBlock: time.Minute * 10, // 10 minutes
RetargetAdjustmentFactor: 4, // 25% less, 400% more
ReduceMinDifficulty: false,
MinDiffReductionTime: 0,
GenerateSupported: false,
// Checkpoints ordered from oldest to newest.
Checkpoints: []Checkpoint{
{11111, newHashFromStr("0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d")},
{33333, newHashFromStr("000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6")},
{74000, newHashFromStr("0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20")},
{105000, newHashFromStr("00000000000291ce28027faea320c8d2b054b2e0fe44a773f3eefb151d6bdc97")},
{134444, newHashFromStr("00000000000005b12ffd4cd315cd34ffd4a594f430ac814c91184a0d42d2b0fe")},
{168000, newHashFromStr("000000000000099e61ea72015e79632f216fe6cb33d7899acb35b75c8303b763")},
{193000, newHashFromStr("000000000000059f452a5f7340de6682a977387c17010ff6e6c3bd83ca8b1317")},
{210000, newHashFromStr("000000000000048b95347e83192f69cf0366076336c639f9b7228e9ba171342e")},
{216116, newHashFromStr("00000000000001b4f4b433e81ee46494af945cf96014816a4e2370f11b23df4e")},
{225430, newHashFromStr("00000000000001c108384350f74090433e7fcf79a606b8e797f065b130575932")},
{250000, newHashFromStr("000000000000003887df1f29024b06fc2200b55f8af8f35453d7be294df2d214")},
{267300, newHashFromStr("000000000000000a83fbd660e918f218bf37edd92b748ad940483c7c116179ac")},
{279000, newHashFromStr("0000000000000001ae8c72a0b0c301f67e3afca10e819efa9041e458e9bd7e40")},
{300255, newHashFromStr("0000000000000000162804527c6e9b9f0563a280525f9d08c12041def0a0f3b2")},
{319400, newHashFromStr("000000000000000021c6052e9becade189495d1c539aa37c58917305fd15f13b")},
{343185, newHashFromStr("0000000000000000072b8bf361d01a6ba7d445dd024203fafc78768ed4368554")},
{352940, newHashFromStr("000000000000000010755df42dba556bb72be6a32f3ce0b6941ce4430152c9ff")},
{382320, newHashFromStr("00000000000000000a8dc6ed5b133d0eb2fd6af56203e4159789b092defd8ab2")},
{400000, newHashFromStr("000000000000000004ec466ce4732fe6f1ed1cddc2ed4b328fff5224276e3f6f")},
{430000, newHashFromStr("000000000000000001868b2bb3a285f3cc6b33ea234eb70facf4dcdf22186b87")},
{460000, newHashFromStr("000000000000000000ef751bbce8e744ad303c47ece06c8d863e4d417efc258c")},
{490000, newHashFromStr("000000000000000000de069137b17b8d5a3dfbd5b145b2dcfb203f15d0c4de90")},
{520000, newHashFromStr("0000000000000000000d26984c0229c9f6962dc74db0a6d525f2f1640396f69c")},
{550000, newHashFromStr("000000000000000000223b7a2298fb1c6c75fb0efc28a4c56853ff4112ec6bc9")},
{560000, newHashFromStr("0000000000000000002c7b276daf6efb2b6aa68e2ce3be67ef925b3264ae7122")},
},
// Consensus rule change deployments.
//
// The miner confirmation window is defined as:
// target proof of work timespan / target proof of work spacing
RuleChangeActivationThreshold: 1916, // 95% of MinerConfirmationWindow
MinerConfirmationWindow: 2016, //
Deployments: [DefinedDeployments]ConsensusDeployment{
DeploymentTestDummy: {
BitNumber: 28,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Unix(11991456010, 0), // January 1, 2008 UTC
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Unix(1230767999, 0), // December 31, 2008 UTC
),
},
DeploymentTestDummyMinActivation: {
BitNumber: 22,
CustomActivationThreshold: 1815, // Only needs 90% hash rate.
MinActivationHeight: 10_0000, // Can only activate after height 10k.
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
DeploymentCSV: {
BitNumber: 0,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Unix(1462060800, 0), // May 1st, 2016
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Unix(1493596800, 0), // May 1st, 2017
),
},
DeploymentSegwit: {
BitNumber: 1,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Unix(1479168000, 0), // November 15, 2016 UTC
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Unix(1510704000, 0), // November 15, 2017 UTC.
),
},
DeploymentTaproot: {
BitNumber: 2,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Unix(1619222400, 0), // April 24th, 2021 UTC.
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Unix(1628640000, 0), // August 11th, 2021 UTC.
),
CustomActivationThreshold: 1815, // 90%
MinActivationHeight: 709_632,
},
},
// Mempool parameters
RelayNonStdTxs: false,
// Human-readable part for Bech32 encoded segwit addresses, as defined in
// BIP 173.
Bech32HRPSegwit: "bc", // always bc for main net
// Address encoding magics
PubKeyHashAddrID: 0x00, // starts with 1
ScriptHashAddrID: 0x05, // starts with 3
PrivateKeyID: 0x80, // starts with 5 (uncompressed) or K (compressed)
WitnessPubKeyHashAddrID: 0x06, // starts with p2
WitnessScriptHashAddrID: 0x0A, // starts with 7Xh
// BIP32 hierarchical deterministic extended key magics
HDPrivateKeyID: [4]byte{0x04, 0x88, 0xad, 0xe4}, // starts with xprv
HDPublicKeyID: [4]byte{0x04, 0x88, 0xb2, 0x1e}, // starts with xpub
// BIP44 coin type used in the hierarchical deterministic path for
// address generation.
HDCoinType: 0,
}
// RegressionNetParams defines the network parameters for the regression test
// Bitcoin network. Not to be confused with the test Bitcoin network (version
// 3), this network is sometimes simply called "testnet".
var RegressionNetParams = Params{
Name: "regtest",
Net: wire.TestNet,
DefaultPort: "18444",
DNSSeeds: []DNSSeed{},
// Chain parameters
GenesisBlock: ®TestGenesisBlock,
GenesisHash: ®TestGenesisHash,
PowLimit: regressionPowLimit,
PowLimitBits: 0x207fffff,
CoinbaseMaturity: 100,
BIP0034Height: 100000000, // Not active - Permit ver 1 blocks
BIP0065Height: 1351, // Used by regression tests
BIP0066Height: 1251, // Used by regression tests
SubsidyReductionInterval: 150,
TargetTimespan: time.Hour * 24 * 14, // 14 days
TargetTimePerBlock: time.Minute * 10, // 10 minutes
RetargetAdjustmentFactor: 4, // 25% less, 400% more
ReduceMinDifficulty: true,
MinDiffReductionTime: time.Minute * 20, // TargetTimePerBlock * 2
GenerateSupported: true,
// Checkpoints ordered from oldest to newest.
Checkpoints: nil,
// Consensus rule change deployments.
//
// The miner confirmation window is defined as:
// target proof of work timespan / target proof of work spacing
RuleChangeActivationThreshold: 108, // 75% of MinerConfirmationWindow
MinerConfirmationWindow: 144,
Deployments: [DefinedDeployments]ConsensusDeployment{
DeploymentTestDummy: {
BitNumber: 28,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
DeploymentTestDummyMinActivation: {
BitNumber: 22,
CustomActivationThreshold: 72, // Only needs 50% hash rate.
MinActivationHeight: 600, // Can only activate after height 600.
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
DeploymentCSV: {
BitNumber: 0,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
DeploymentSegwit: {
BitNumber: 1,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires.
),
},
DeploymentTaproot: {
BitNumber: 2,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires.
),
CustomActivationThreshold: 108, // Only needs 75% hash rate.
},
},
// Mempool parameters
RelayNonStdTxs: true,
// Human-readable part for Bech32 encoded segwit addresses, as defined in
// BIP 173.
Bech32HRPSegwit: "bcrt", // always bcrt for reg test net
// Address encoding magics
PubKeyHashAddrID: 0x6f, // starts with m or n
ScriptHashAddrID: 0xc4, // starts with 2
PrivateKeyID: 0xef, // starts with 9 (uncompressed) or c (compressed)
// BIP32 hierarchical deterministic extended key magics
HDPrivateKeyID: [4]byte{0x04, 0x35, 0x83, 0x94}, // starts with tprv
HDPublicKeyID: [4]byte{0x04, 0x35, 0x87, 0xcf}, // starts with tpub
// BIP44 coin type used in the hierarchical deterministic path for
// address generation.
HDCoinType: 1,
}
// TestNet3Params defines the network parameters for the test Bitcoin network
// (version 3). Not to be confused with the regression test network, this
// network is sometimes simply called "testnet".
var TestNet3Params = Params{
Name: "testnet3",
Net: wire.TestNet3,
DefaultPort: "18333",
DNSSeeds: []DNSSeed{
{"testnet-seed.bitcoin.jonasschnelli.ch", true},
{"testnet-seed.bitcoin.schildbach.de", false},
{"seed.tbtc.petertodd.org", true},
{"testnet-seed.bluematt.me", false},
},
// Chain parameters
GenesisBlock: &testNet3GenesisBlock,
GenesisHash: &testNet3GenesisHash,
PowLimit: testNet3PowLimit,
PowLimitBits: 0x1d00ffff,
BIP0034Height: 21111, // 0000000023b3a96d3484e5abb3755c413e7d41500f8e2a5c3f0dd01299cd8ef8
BIP0065Height: 581885, // 00000000007f6655f22f98e72ed80d8b06dc761d5da09df0fa1dc4be4f861eb6
BIP0066Height: 330776, // 000000002104c8c45e99a8853285a3b592602a3ccde2b832481da85e9e4ba182
CoinbaseMaturity: 100,
SubsidyReductionInterval: 210000,
TargetTimespan: time.Hour * 24 * 14, // 14 days
TargetTimePerBlock: time.Minute * 10, // 10 minutes
RetargetAdjustmentFactor: 4, // 25% less, 400% more
ReduceMinDifficulty: true,
MinDiffReductionTime: time.Minute * 20, // TargetTimePerBlock * 2
GenerateSupported: false,
// Checkpoints ordered from oldest to newest.
Checkpoints: []Checkpoint{
{546, newHashFromStr("000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70")},
{100000, newHashFromStr("00000000009e2958c15ff9290d571bf9459e93b19765c6801ddeccadbb160a1e")},
{200000, newHashFromStr("0000000000287bffd321963ef05feab753ebe274e1d78b2fd4e2bfe9ad3aa6f2")},
{300001, newHashFromStr("0000000000004829474748f3d1bc8fcf893c88be255e6d7f571c548aff57abf4")},
{400002, newHashFromStr("0000000005e2c73b8ecb82ae2dbc2e8274614ebad7172b53528aba7501f5a089")},
{500011, newHashFromStr("00000000000929f63977fbac92ff570a9bd9e7715401ee96f2848f7b07750b02")},
{600002, newHashFromStr("000000000001f471389afd6ee94dcace5ccc44adc18e8bff402443f034b07240")},
{700000, newHashFromStr("000000000000406178b12a4dea3b27e13b3c4fe4510994fd667d7c1e6a3f4dc1")},
{800010, newHashFromStr("000000000017ed35296433190b6829db01e657d80631d43f5983fa403bfdb4c1")},
{900000, newHashFromStr("0000000000356f8d8924556e765b7a94aaebc6b5c8685dcfa2b1ee8b41acd89b")},
{1000007, newHashFromStr("00000000001ccb893d8a1f25b70ad173ce955e5f50124261bbbc50379a612ddf")},
{1100007, newHashFromStr("00000000000abc7b2cd18768ab3dee20857326a818d1946ed6796f42d66dd1e8")},
{1200007, newHashFromStr("00000000000004f2dc41845771909db57e04191714ed8c963f7e56713a7b6cea")},
{1300007, newHashFromStr("0000000072eab69d54df75107c052b26b0395b44f77578184293bf1bb1dbd9fa")},
},
// Consensus rule change deployments.
//
// The miner confirmation window is defined as:
// target proof of work timespan / target proof of work spacing
RuleChangeActivationThreshold: 1512, // 75% of MinerConfirmationWindow
MinerConfirmationWindow: 2016,
Deployments: [DefinedDeployments]ConsensusDeployment{
DeploymentTestDummy: {
BitNumber: 28,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Unix(1199145601, 0), // January 1, 2008 UTC
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Unix(1230767999, 0), // December 31, 2008 UTC
),
},
DeploymentTestDummyMinActivation: {
BitNumber: 22,
CustomActivationThreshold: 1815, // Only needs 90% hash rate.
MinActivationHeight: 10_0000, // Can only activate after height 10k.
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
DeploymentCSV: {
BitNumber: 0,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Unix(1456790400, 0), // March 1st, 2016
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Unix(1493596800, 0), // May 1st, 2017
),
},
DeploymentSegwit: {
BitNumber: 1,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Unix(1462060800, 0), // May 1, 2016 UTC
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Unix(1493596800, 0), // May 1, 2017 UTC.
),
},
DeploymentTaproot: {
BitNumber: 2,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Unix(1619222400, 0), // April 24th, 2021 UTC.
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Unix(1628640000, 0), // August 11th, 2021 UTC
),
CustomActivationThreshold: 1512, // 75%
},
},
// Mempool parameters
RelayNonStdTxs: true,
// Human-readable part for Bech32 encoded segwit addresses, as defined in
// BIP 173.
Bech32HRPSegwit: "tb", // always tb for test net
// Address encoding magics
PubKeyHashAddrID: 0x6f, // starts with m or n
ScriptHashAddrID: 0xc4, // starts with 2
WitnessPubKeyHashAddrID: 0x03, // starts with QW
WitnessScriptHashAddrID: 0x28, // starts with T7n
PrivateKeyID: 0xef, // starts with 9 (uncompressed) or c (compressed)
// BIP32 hierarchical deterministic extended key magics
HDPrivateKeyID: [4]byte{0x04, 0x35, 0x83, 0x94}, // starts with tprv
HDPublicKeyID: [4]byte{0x04, 0x35, 0x87, 0xcf}, // starts with tpub
// BIP44 coin type used in the hierarchical deterministic path for
// address generation.
HDCoinType: 1,
}
// SimNetParams defines the network parameters for the simulation test Bitcoin
// network. This network is similar to the normal test network except it is
// intended for private use within a group of individuals doing simulation
// testing. The functionality is intended to differ in that the only nodes
// which are specifically specified are used to create the network rather than
// following normal discovery rules. This is important as otherwise it would
// just turn into another public testnet.
var SimNetParams = Params{
Name: "simnet",
Net: wire.SimNet,
DefaultPort: "18555",
DNSSeeds: []DNSSeed{}, // NOTE: There must NOT be any seeds.
// Chain parameters
GenesisBlock: &simNetGenesisBlock,
GenesisHash: &simNetGenesisHash,
PowLimit: simNetPowLimit,
PowLimitBits: 0x207fffff,
BIP0034Height: 0, // Always active on simnet
BIP0065Height: 0, // Always active on simnet
BIP0066Height: 0, // Always active on simnet
CoinbaseMaturity: 100,
SubsidyReductionInterval: 210000,
TargetTimespan: time.Hour * 24 * 14, // 14 days
TargetTimePerBlock: time.Minute * 10, // 10 minutes
RetargetAdjustmentFactor: 4, // 25% less, 400% more
ReduceMinDifficulty: true,
MinDiffReductionTime: time.Minute * 20, // TargetTimePerBlock * 2
GenerateSupported: true,
// Checkpoints ordered from oldest to newest.
Checkpoints: nil,
// Consensus rule change deployments.
//
// The miner confirmation window is defined as:
// target proof of work timespan / target proof of work spacing
RuleChangeActivationThreshold: 75, // 75% of MinerConfirmationWindow
MinerConfirmationWindow: 100,
Deployments: [DefinedDeployments]ConsensusDeployment{
DeploymentTestDummy: {
BitNumber: 28,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
DeploymentTestDummyMinActivation: {
BitNumber: 22,
CustomActivationThreshold: 50, // Only needs 50% hash rate.
MinActivationHeight: 600, // Can only activate after height 600.
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
DeploymentCSV: {
BitNumber: 0,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
DeploymentSegwit: {
BitNumber: 1,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires.
),
},
DeploymentTaproot: {
BitNumber: 2,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires.
),
CustomActivationThreshold: 75, // Only needs 75% hash rate.
},
},
// Mempool parameters
RelayNonStdTxs: true,
// Human-readable part for Bech32 encoded segwit addresses, as defined in
// BIP 173.
Bech32HRPSegwit: "sb", // always sb for sim net
// Address encoding magics
PubKeyHashAddrID: 0x3f, // starts with S
ScriptHashAddrID: 0x7b, // starts with s
PrivateKeyID: 0x64, // starts with 4 (uncompressed) or F (compressed)
WitnessPubKeyHashAddrID: 0x19, // starts with Gg
WitnessScriptHashAddrID: 0x28, // starts with ?
// BIP32 hierarchical deterministic extended key magics
HDPrivateKeyID: [4]byte{0x04, 0x20, 0xb9, 0x00}, // starts with sprv
HDPublicKeyID: [4]byte{0x04, 0x20, 0xbd, 0x3a}, // starts with spub
// BIP44 coin type used in the hierarchical deterministic path for
// address generation.
HDCoinType: 115, // ASCII for s
}
// SigNetParams defines the network parameters for the default public signet
// Bitcoin network. Not to be confused with the regression test network, this
// network is sometimes simply called "signet" or "taproot signet".
var SigNetParams = CustomSignetParams(
DefaultSignetChallenge, DefaultSignetDNSSeeds,
)
// CustomSignetParams creates network parameters for a custom signet network
// from a challenge. The challenge is the binary compiled version of the block
// challenge script.
func CustomSignetParams(challenge []byte, dnsSeeds []DNSSeed) Params {
// The message start is defined as the first four bytes of the sha256d
// of the challenge script, as a single push (i.e. prefixed with the
// challenge script length).
challengeLength := byte(len(challenge))
hashDouble := chainhash.DoubleHashB(
append([]byte{challengeLength}, challenge...),
)
// We use little endian encoding of the hash prefix to be in line with
// the other wire network identities.
net := binary.LittleEndian.Uint32(hashDouble[0:4])
return Params{
Name: "signet",
Net: wire.BitcoinNet(net),
DefaultPort: "38333",
DNSSeeds: dnsSeeds,
// Chain parameters
GenesisBlock: &sigNetGenesisBlock,
GenesisHash: &sigNetGenesisHash,
PowLimit: sigNetPowLimit,
PowLimitBits: 0x1e0377ae,
BIP0034Height: 1,
BIP0065Height: 1,
BIP0066Height: 1,
CoinbaseMaturity: 100,
SubsidyReductionInterval: 210000,
TargetTimespan: time.Hour * 24 * 14, // 14 days
TargetTimePerBlock: time.Minute * 10, // 10 minutes
RetargetAdjustmentFactor: 4, // 25% less, 400% more
ReduceMinDifficulty: false,
MinDiffReductionTime: time.Minute * 20, // TargetTimePerBlock * 2
GenerateSupported: false,
// Checkpoints ordered from oldest to newest.
Checkpoints: nil,
// Consensus rule change deployments.
//
// The miner confirmation window is defined as:
// target proof of work timespan / target proof of work spacing
RuleChangeActivationThreshold: 1916, // 95% of 2016
MinerConfirmationWindow: 2016,
Deployments: [DefinedDeployments]ConsensusDeployment{
DeploymentTestDummy: {
BitNumber: 28,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Unix(1199145601, 0), // January 1, 2008 UTC
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Unix(1230767999, 0), // December 31, 2008 UTC
),
},
DeploymentTestDummyMinActivation: {
BitNumber: 22,
CustomActivationThreshold: 1815, // Only needs 90% hash rate.
MinActivationHeight: 10_0000, // Can only activate after height 10k.
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
DeploymentCSV: {
BitNumber: 29,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
DeploymentSegwit: {
BitNumber: 29,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
DeploymentTaproot: {
BitNumber: 29,
DeploymentStarter: NewMedianTimeDeploymentStarter(
time.Time{}, // Always available for vote
),
DeploymentEnder: NewMedianTimeDeploymentEnder(
time.Time{}, // Never expires
),
},
},
// Mempool parameters
RelayNonStdTxs: false,
// Human-readable part for Bech32 encoded segwit addresses, as defined in
// BIP 173.
Bech32HRPSegwit: "tb", // always tb for test net
// Address encoding magics
PubKeyHashAddrID: 0x6f, // starts with m or n
ScriptHashAddrID: 0xc4, // starts with 2
WitnessPubKeyHashAddrID: 0x03, // starts with QW
WitnessScriptHashAddrID: 0x28, // starts with T7n
PrivateKeyID: 0xef, // starts with 9 (uncompressed) or c (compressed)
// BIP32 hierarchical deterministic extended key magics
HDPrivateKeyID: [4]byte{0x04, 0x35, 0x83, 0x94}, // starts with tprv
HDPublicKeyID: [4]byte{0x04, 0x35, 0x87, 0xcf}, // starts with tpub
// BIP44 coin type used in the hierarchical deterministic path for
// address generation.
HDCoinType: 1,
}
}
var (
// ErrDuplicateNet describes an error where the parameters for a Bitcoin
// network could not be set due to the network already being a standard
// network or previously-registered into this package.
ErrDuplicateNet = errors.New("duplicate Bitcoin network")
// ErrUnknownHDKeyID describes an error where the provided id which
// is intended to identify the network for a hierarchical deterministic
// private extended key is not registered.
ErrUnknownHDKeyID = errors.New("unknown hd private extended key bytes")
// ErrInvalidHDKeyID describes an error where the provided hierarchical
// deterministic version bytes, or hd key id, is malformed.
ErrInvalidHDKeyID = errors.New("invalid hd extended key version bytes")
)
var (
registeredNets = make(map[wire.BitcoinNet]struct{})
pubKeyHashAddrIDs = make(map[byte]struct{})
scriptHashAddrIDs = make(map[byte]struct{})
bech32SegwitPrefixes = make(map[string]struct{})
hdPrivToPubKeyIDs = make(map[[4]byte][]byte)
)
// String returns the hostname of the DNS seed in human-readable form.
func (d DNSSeed) String() string {
return d.Host
}
// Register registers the network parameters for a Bitcoin network. This may
// error with ErrDuplicateNet if the network is already registered (either
// due to a previous Register call, or the network being one of the default
// networks).
//
// Network parameters should be registered into this package by a main package
// as early as possible. Then, library packages may lookup networks or network
// parameters based on inputs and work regardless of the network being standard
// or not.
func Register(params *Params) error {
if _, ok := registeredNets[params.Net]; ok {
return ErrDuplicateNet
}
registeredNets[params.Net] = struct{}{}
pubKeyHashAddrIDs[params.PubKeyHashAddrID] = struct{}{}
scriptHashAddrIDs[params.ScriptHashAddrID] = struct{}{}
err := RegisterHDKeyID(params.HDPublicKeyID[:], params.HDPrivateKeyID[:])
if err != nil {
return err
}
// A valid Bech32 encoded segwit address always has as prefix the
// human-readable part for the given net followed by '1'.
bech32SegwitPrefixes[params.Bech32HRPSegwit+"1"] = struct{}{}
return nil
}
// mustRegister performs the same function as Register except it panics if there
// is an error. This should only be called from package init functions.
func mustRegister(params *Params) {
if err := Register(params); err != nil {
panic("failed to register network: " + err.Error())
}
}
// IsPubKeyHashAddrID returns whether the id is an identifier known to prefix a
// pay-to-pubkey-hash address on any default or registered network. This is
// used when decoding an address string into a specific address type. It is up
// to the caller to check both this and IsScriptHashAddrID and decide whether an
// address is a pubkey hash address, script hash address, neither, or
// undeterminable (if both return true).
func IsPubKeyHashAddrID(id byte) bool {
_, ok := pubKeyHashAddrIDs[id]
return ok
}
// IsScriptHashAddrID returns whether the id is an identifier known to prefix a
// pay-to-script-hash address on any default or registered network. This is
// used when decoding an address string into a specific address type. It is up
// to the caller to check both this and IsPubKeyHashAddrID and decide whether an
// address is a pubkey hash address, script hash address, neither, or
// undeterminable (if both return true).
func IsScriptHashAddrID(id byte) bool {
_, ok := scriptHashAddrIDs[id]
return ok
}
// IsBech32SegwitPrefix returns whether the prefix is a known prefix for segwit
// addresses on any default or registered network. This is used when decoding
// an address string into a specific address type.
func IsBech32SegwitPrefix(prefix string) bool {
prefix = strings.ToLower(prefix)
_, ok := bech32SegwitPrefixes[prefix]
return ok
}
// RegisterHDKeyID registers a public and private hierarchical deterministic
// extended key ID pair.
//
// Non-standard HD version bytes, such as the ones documented in SLIP-0132,
// should be registered using this method for library packages to lookup key
// IDs (aka HD version bytes). When the provided key IDs are invalid, the
// ErrInvalidHDKeyID error will be returned.
//
// Reference:
// SLIP-0132 : Registered HD version bytes for BIP-0032
// https://github.com/satoshilabs/slips/blob/master/slip-0132.md
func RegisterHDKeyID(hdPublicKeyID []byte, hdPrivateKeyID []byte) error {
if len(hdPublicKeyID) != 4 || len(hdPrivateKeyID) != 4 {
return ErrInvalidHDKeyID