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