mirror of
https://github.com/FlipsideCrypto/dcrd.git
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f860883562
chaincfg/v2 modified the Params type to contain the required payouts created by the miner of the block at height 1. However, it was discovered that, due to code generation issues of the Go compiler, this caused the package's weight (measured by github.com/jondot/goweight) to explode to 7.7 MB. This appears to be due to an enormous amount of function calls, all of which could panic, when building the large slice literal. This improves the compiled size of the package by using code generation techniques to optimize the memory layout and code transformation of the subsidy values each time a params function is called. A single string contains all scripts for subsidy payouts concatenated together, in hex encoding, and a slice contains the index in the script data and the required payout amount. This is iterated in a loop to create a []TokenPayout each time it is needed. The new size of the compiled package using Go 1.12.7 on OpenBSD/amd64 is 379 kB, a reduction of 7.32 MB, and about 5% of the original size.
315 lines
12 KiB
Go
315 lines
12 KiB
Go
// Copyright (c) 2014-2016 The btcsuite developers
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// Copyright (c) 2015-2019 The Decred 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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"math/big"
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"time"
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"github.com/decred/dcrd/chaincfg/chainhash"
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"github.com/decred/dcrd/wire"
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)
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// MainNetParams returns the network parameters for the main Decred network.
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func MainNetParams() *Params {
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// mainPowLimit is the highest proof of work value a Decred block can have
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// 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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// genesisBlock defines the genesis block of the block chain which serves as
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// the public transaction ledger for the main network.
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//
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// The genesis block for Decred mainnet, testnet, and simnet are not
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// evaluated for proof of work. The only values that are ever used elsewhere
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// in the blockchain from it are:
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// (1) The genesis block hash is used as the PrevBlock.
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// (2) The difficulty starts off at the value given by Bits.
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// (3) The stake difficulty starts off at the value given by SBits.
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// (4) The timestamp, which guides when blocks can be built on top of it
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// and what the initial difficulty calculations come out to be.
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//
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// The genesis block is valid by definition and none of the fields within it
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// are validated for correctness.
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genesisBlock := wire.MsgBlock{
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Header: wire.BlockHeader{
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Version: 1,
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PrevBlock: chainhash.Hash{}, // All zero.
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// MerkleRoot: Calculated below.
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StakeRoot: chainhash.Hash{},
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Timestamp: time.Unix(1454954400, 0), // Mon, 08 Feb 2016 18:00:00 GMT
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Bits: 0x1b01ffff, // Difficulty 32767
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SBits: 2 * 1e8, // 2 Coin
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Nonce: 0x00000000,
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StakeVersion: 0,
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},
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Transactions: []*wire.MsgTx{{
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SerType: wire.TxSerializeFull,
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Version: 1,
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TxIn: []*wire.TxIn{{
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// Fully null.
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PreviousOutPoint: wire.OutPoint{
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Hash: chainhash.Hash{},
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Index: 0xffffffff,
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Tree: 0,
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},
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SignatureScript: hexDecode("0000"),
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Sequence: 0xffffffff,
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BlockHeight: wire.NullBlockHeight,
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BlockIndex: wire.NullBlockIndex,
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ValueIn: wire.NullValueIn,
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}},
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TxOut: []*wire.TxOut{{
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Version: 0x0000,
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Value: 0x00000000,
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PkScript: hexDecode("801679e98561ada96caec2949a5d41c4cab3851e" +
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"b740d951c10ecbcf265c1fd9"),
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}},
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LockTime: 0,
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Expiry: 0,
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}},
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}
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genesisBlock.Header.MerkleRoot = genesisBlock.Transactions[0].TxHashFull()
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return &Params{
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Name: "mainnet",
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Net: wire.MainNet,
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DefaultPort: "9108",
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DNSSeeds: []DNSSeed{
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{"mainnet-seed.decred.mindcry.org", true},
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{"mainnet-seed.decred.netpurgatory.com", true},
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{"mainnet-seed.decred.org", true},
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},
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// Chain parameters
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GenesisBlock: &genesisBlock,
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GenesisHash: genesisBlock.BlockHash(),
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PowLimit: mainPowLimit,
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PowLimitBits: 0x1d00ffff,
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ReduceMinDifficulty: false,
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MinDiffReductionTime: 0, // Does not apply since ReduceMinDifficulty false
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GenerateSupported: false,
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MaximumBlockSizes: []int{393216},
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MaxTxSize: 393216,
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TargetTimePerBlock: time.Minute * 5,
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WorkDiffAlpha: 1,
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WorkDiffWindowSize: 144,
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WorkDiffWindows: 20,
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TargetTimespan: time.Minute * 5 * 144, // TimePerBlock * WindowSize
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RetargetAdjustmentFactor: 4,
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// Subsidy parameters.
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BaseSubsidy: 3119582664, // 21m
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MulSubsidy: 100,
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DivSubsidy: 101,
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SubsidyReductionInterval: 6144,
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WorkRewardProportion: 6,
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StakeRewardProportion: 3,
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BlockTaxProportion: 1,
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// Checkpoints ordered from oldest to newest.
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Checkpoints: []Checkpoint{
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{440, newHashFromStr("0000000000002203eb2c95ee96906730bb56b2985e174518f90eb4db29232d93")},
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{24480, newHashFromStr("0000000000000c9d4239c4ef7ef3fb5aaeed940244bc69c57c8c5e1f071b28a6")},
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{48590, newHashFromStr("0000000000000d5e0de21a96d3c965f5f2db2c82612acd7389c140c9afe92ba7")},
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{54770, newHashFromStr("00000000000009293d067b1126b7de07fc9b2b94ee50dfe0d48c239a7adb072c")},
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{60720, newHashFromStr("0000000000000a64475d68ffb9ad89a3d147c0f5138db26b40da9d19d0004117")},
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{65270, newHashFromStr("0000000000000021f107601962789b201f0a0cbb98ac5f8c12b93d94e795b441")},
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{75380, newHashFromStr("0000000000000e7d13cfc85806aa720fe3670980f5b7d33253e4f41985558372")},
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{85410, newHashFromStr("00000000000013ec928074bea6eac9754aa614c7acb20edf300f18b0cd122692")},
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{99880, newHashFromStr("0000000000000cb2a9a9ded647b9f78aae51ace32dd8913701d420ead272913c")},
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{123080, newHashFromStr("000000000000009ea6e02d0f0424f445ed50686f9ae4aecdf3b268e981114477")},
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{135960, newHashFromStr("00000000000001d2f9bbca9177972c0ba45acb40836b72945a75d73b99079498")},
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{139740, newHashFromStr("00000000000001397179ae1aff156fb1aea228938d06b83e43b78b1c44527b5b")},
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{155900, newHashFromStr("000000000000008557e37fb05177fc5a54e693de20689753639135f85a2dcb2e")},
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{164300, newHashFromStr("000000000000009ed067ff51cd5e15f3c786222a5183b20a991a80ce535907a9")},
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{181020, newHashFromStr("00000000000000b77d832cb2cbed02908d69323862a53e56345400ad81a6fb8f")},
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{189950, newHashFromStr("000000000000007341d8ae2ea7e41f25cee00e1a70a4a3dc1cb055d14ecb2e11")},
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{214672, newHashFromStr("0000000000000021d5cbeead55cb7fd659f07e8127358929ffc34cd362209758")},
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{259810, newHashFromStr("0000000000000000ee0fbf469a9f32477ffbb46ebd7a280a53c842ab4243f97c")},
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{295940, newHashFromStr("0000000000000000148852c8a919addf4043f9f267b13c08df051d359f1622ca")},
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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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RuleChangeActivationQuorum: 4032, // 10 % of RuleChangeActivationInterval * TicketsPerBlock
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RuleChangeActivationMultiplier: 3, // 75%
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RuleChangeActivationDivisor: 4,
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RuleChangeActivationInterval: 2016 * 4, // 4 weeks
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Deployments: map[uint32][]ConsensusDeployment{
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4: {{
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Vote: Vote{
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Id: VoteIDSDiffAlgorithm,
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Description: "Change stake difficulty algorithm as defined in DCP0001",
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Mask: 0x0006, // Bits 1 and 2
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Choices: []Choice{{
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Id: "abstain",
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Description: "abstain voting for change",
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Bits: 0x0000,
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IsAbstain: true,
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IsNo: false,
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}, {
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Id: "no",
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Description: "keep the existing algorithm",
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Bits: 0x0002, // Bit 1
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IsAbstain: false,
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IsNo: true,
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}, {
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Id: "yes",
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Description: "change to the new algorithm",
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Bits: 0x0004, // Bit 2
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IsAbstain: false,
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IsNo: false,
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}},
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},
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StartTime: 1493164800, // Apr 26th, 2017
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ExpireTime: 1524700800, // Apr 26th, 2018
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}, {
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Vote: Vote{
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Id: VoteIDLNSupport,
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Description: "Request developers begin work on Lightning Network (LN) integration",
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Mask: 0x0018, // Bits 3 and 4
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Choices: []Choice{{
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Id: "abstain",
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Description: "abstain from voting",
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Bits: 0x0000,
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IsAbstain: true,
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IsNo: false,
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}, {
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Id: "no",
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Description: "no, do not work on integrating LN support",
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Bits: 0x0008, // Bit 3
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IsAbstain: false,
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IsNo: true,
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}, {
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Id: "yes",
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Description: "yes, begin work on integrating LN support",
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Bits: 0x0010, // Bit 4
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IsAbstain: false,
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IsNo: false,
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}},
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},
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StartTime: 1493164800, // Apr 26th, 2017
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ExpireTime: 1508976000, // Oct 26th, 2017
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}},
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5: {{
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Vote: Vote{
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Id: VoteIDLNFeatures,
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Description: "Enable features defined in DCP0002 and DCP0003 necessary to support Lightning Network (LN)",
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Mask: 0x0006, // Bits 1 and 2
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Choices: []Choice{{
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Id: "abstain",
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Description: "abstain voting for change",
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Bits: 0x0000,
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IsAbstain: true,
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IsNo: false,
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}, {
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Id: "no",
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Description: "keep the existing consensus rules",
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Bits: 0x0002, // Bit 1
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IsAbstain: false,
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IsNo: true,
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}, {
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Id: "yes",
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Description: "change to the new consensus rules",
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Bits: 0x0004, // Bit 2
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IsAbstain: false,
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IsNo: false,
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}},
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},
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StartTime: 1505260800, // Sep 13th, 2017
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ExpireTime: 1536796800, // Sep 13th, 2018
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}},
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6: {{
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Vote: Vote{
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Id: VoteIDFixLNSeqLocks,
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Description: "Modify sequence lock handling as defined in DCP0004",
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Mask: 0x0006, // Bits 1 and 2
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Choices: []Choice{{
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Id: "abstain",
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Description: "abstain voting for change",
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Bits: 0x0000,
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IsAbstain: true,
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IsNo: false,
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}, {
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Id: "no",
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Description: "keep the existing consensus rules",
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Bits: 0x0002, // Bit 1
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IsAbstain: false,
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IsNo: true,
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}, {
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Id: "yes",
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Description: "change to the new consensus rules",
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Bits: 0x0004, // Bit 2
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IsAbstain: false,
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IsNo: false,
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}},
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},
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StartTime: 1548633600, // Jan 28th, 2019
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ExpireTime: 1580169600, // Jan 28th, 2020
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}},
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},
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// Enforce current block version once majority of the network has
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// upgraded.
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// 75% (750 / 1000)
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//
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// Reject previous block versions once a majority of the network has
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// upgraded.
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// 95% (950 / 1000)
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BlockEnforceNumRequired: 750,
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BlockRejectNumRequired: 950,
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BlockUpgradeNumToCheck: 1000,
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// AcceptNonStdTxs is a mempool param to either accept and relay non
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// standard txs to the network or reject them
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AcceptNonStdTxs: false,
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// Address encoding magics
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NetworkAddressPrefix: "D",
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PubKeyAddrID: [2]byte{0x13, 0x86}, // starts with Dk
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PubKeyHashAddrID: [2]byte{0x07, 0x3f}, // starts with Ds
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PKHEdwardsAddrID: [2]byte{0x07, 0x1f}, // starts with De
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PKHSchnorrAddrID: [2]byte{0x07, 0x01}, // starts with DS
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ScriptHashAddrID: [2]byte{0x07, 0x1a}, // starts with Dc
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PrivateKeyID: [2]byte{0x22, 0xde}, // starts with Pm
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// BIP32 hierarchical deterministic extended key magics
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HDPrivateKeyID: [4]byte{0x02, 0xfd, 0xa4, 0xe8}, // starts with dprv
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HDPublicKeyID: [4]byte{0x02, 0xfd, 0xa9, 0x26}, // starts with dpub
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// BIP44 coin type used in the hierarchical deterministic path for
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// address generation.
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SLIP0044CoinType: 42, // SLIP0044, Decred
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LegacyCoinType: 20, // for backwards compatibility
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// Decred PoS parameters
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MinimumStakeDiff: 2 * 1e8, // 2 Coin
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TicketPoolSize: 8192,
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TicketsPerBlock: 5,
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TicketMaturity: 256,
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TicketExpiry: 40960, // 5*TicketPoolSize
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CoinbaseMaturity: 256,
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SStxChangeMaturity: 1,
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TicketPoolSizeWeight: 4,
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StakeDiffAlpha: 1, // Minimal
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StakeDiffWindowSize: 144,
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StakeDiffWindows: 20,
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StakeVersionInterval: 144 * 2 * 7, // ~1 week
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MaxFreshStakePerBlock: 20, // 4*TicketsPerBlock
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StakeEnabledHeight: 256 + 256, // CoinbaseMaturity + TicketMaturity
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StakeValidationHeight: 4096, // ~14 days
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StakeBaseSigScript: []byte{0x00, 0x00},
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StakeMajorityMultiplier: 3,
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StakeMajorityDivisor: 4,
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// Decred organization related parameters
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// Organization address is Dcur2mcGjmENx4DhNqDctW5wJCVyT3Qeqkx
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OrganizationPkScript: hexDecode("a914f5916158e3e2c4551c1796708db8367207ed13bb87"),
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OrganizationPkScriptVersion: 0,
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BlockOneLedger: tokenPayouts_MainNetParams(),
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}
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}
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