93 lines
3 KiB
Go
93 lines
3 KiB
Go
// Copyright (c) 2013 Conformal Systems LLC.
|
|
// Use of this source code is governed by an ISC
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package btcchain
|
|
|
|
import (
|
|
"github.com/conformal/btcwire"
|
|
"math/big"
|
|
)
|
|
|
|
// Params houses parameters unique to various bitcoin networks such as the main
|
|
// network and test networks. See ChainParams.
|
|
type Params struct {
|
|
// GenesisBlock is the genesis block for the specific network.
|
|
GenesisBlock *btcwire.MsgBlock
|
|
|
|
// GenesisHash is the genesis block hash for the specific network.
|
|
GenesisHash *btcwire.ShaHash
|
|
|
|
// PowLimit is the highest proof of work value a bitcoin block can have
|
|
// for the specific network.
|
|
PowLimit *big.Int
|
|
|
|
// PowLimitBits is the highest proof of work value a bitcoin block can
|
|
// have represented in compact form. See CompactToBig for more details
|
|
// on compact form.
|
|
PowLimitBits uint32
|
|
}
|
|
|
|
// mainPowLimit is the highest proof of work value a bitcoin block can have for
|
|
// the main network. It is the value 2^224 - 1.
|
|
var mainPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 224), bigOne)
|
|
|
|
// mainNetParams contains parameters specific to the main network
|
|
// (btcwire.MainNet).
|
|
var mainNetParams = Params{
|
|
GenesisBlock: &btcwire.GenesisBlock,
|
|
GenesisHash: &btcwire.GenesisHash,
|
|
PowLimit: mainPowLimit,
|
|
PowLimitBits: BigToCompact(mainPowLimit),
|
|
}
|
|
|
|
// 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.
|
|
var regressionPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 255), bigOne)
|
|
|
|
// regressionParams contains parameters specific to the regression test network
|
|
// (btcwire.TestNet).
|
|
var regressionParams = Params{
|
|
GenesisBlock: &btcwire.TestNetGenesisBlock,
|
|
GenesisHash: &btcwire.TestNetGenesisHash,
|
|
PowLimit: regressionPowLimit,
|
|
PowLimitBits: BigToCompact(regressionPowLimit),
|
|
}
|
|
|
|
// testNetPowLimit 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.
|
|
var testNetPowLimit = new(big.Int).Sub(new(big.Int).Lsh(bigOne, 224), bigOne)
|
|
|
|
// testNet3Params contains parameters specific to the test network (version 3)
|
|
// (btcwire.TestNet3).
|
|
var testNet3Params = Params{
|
|
GenesisBlock: &btcwire.TestNet3GenesisBlock,
|
|
GenesisHash: &btcwire.TestNet3GenesisHash,
|
|
PowLimit: testNetPowLimit,
|
|
PowLimitBits: BigToCompact(testNetPowLimit),
|
|
}
|
|
|
|
// chainParams returns chain parameters specific to the bitcoin network
|
|
// associated with the BlockChain instance.
|
|
func (b *BlockChain) chainParams() *Params {
|
|
return ChainParams(b.btcnet)
|
|
}
|
|
|
|
// ChainParams returns chain parameters specific to the passed bitcoin network.
|
|
// It returns the parameters for btcwire.MainNet if the passed network is not
|
|
// supported.
|
|
func ChainParams(btcnet btcwire.BitcoinNet) *Params {
|
|
switch btcnet {
|
|
case btcwire.TestNet:
|
|
return ®ressionParams
|
|
|
|
case btcwire.TestNet3:
|
|
return &testNet3Params
|
|
|
|
// Return main net by default.
|
|
case btcwire.MainNet:
|
|
fallthrough
|
|
default:
|
|
return &mainNetParams
|
|
}
|
|
}
|