mainnetparams.go

// Copyright (c) 2014-2016 The btcsuite developers
// Copyright (c) 2015-2019 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.

package chaincfg

import (
	"math/big"
	"time"

	"github.com/decred/dcrd/chaincfg/chainhash"
	"github.com/decred/dcrd/wire"
)

// MainNetParams returns the network parameters for the main Decred network.
func MainNetParams() *Params {
	// mainPowLimit is the highest proof of work value a Decred 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)

	// genesisBlock defines the genesis block of the block chain which serves as
	// the public transaction ledger for the main network.
	//
	// The genesis block for Decred mainnet, testnet, and simnet are not
	// evaluated for proof of work. The only values that are ever used elsewhere
	// in the blockchain from it are:
	// (1) The genesis block hash is used as the PrevBlock.
	// (2) The difficulty starts off at the value given by Bits.
	// (3) The stake difficulty starts off at the value given by SBits.
	// (4) The timestamp, which guides when blocks can be built on top of it
	//      and what the initial difficulty calculations come out to be.
	//
	// The genesis block is valid by definition and none of the fields within it
	// are validated for correctness.
	genesisBlock := wire.MsgBlock{
		Header: wire.BlockHeader{
			Version:   1,
			PrevBlock: chainhash.Hash{}, // All zero.
			// MerkleRoot: Calculated below.
			StakeRoot:    chainhash.Hash{},
			Timestamp:    time.Unix(1454954400, 0), // Mon, 08 Feb 2016 18:00:00 GMT
			Bits:         0x1b01ffff,               // Difficulty 32767
			SBits:        2 * 1e8,                  // 2 Coin
			Nonce:        0x00000000,
			StakeVersion: 0,
		},
		Transactions: []*wire.MsgTx{{
			SerType: wire.TxSerializeFull,
			Version: 1,
			TxIn: []*wire.TxIn{{
				// Fully null.
				PreviousOutPoint: wire.OutPoint{
					Hash:  chainhash.Hash{},
					Index: 0xffffffff,
					Tree:  0,
				},
				SignatureScript: hexDecode("0000"),
				Sequence:        0xffffffff,
				BlockHeight:     wire.NullBlockHeight,
				BlockIndex:      wire.NullBlockIndex,
				ValueIn:         wire.NullValueIn,
			}},
			TxOut: []*wire.TxOut{{
				Version: 0x0000,
				Value:   0x00000000,
				PkScript: hexDecode("801679e98561ada96caec2949a5d41c4cab3851e" +
					"b740d951c10ecbcf265c1fd9"),
			}},
			LockTime: 0,
			Expiry:   0,
		}},
	}
	genesisBlock.Header.MerkleRoot = genesisBlock.Transactions[0].TxHashFull()

	return &Params{
		Name:        "mainnet",
		Net:         wire.MainNet,
		DefaultPort: "9108",
		DNSSeeds: []DNSSeed{
			{"mainnet-seed.decred.mindcry.org", true},
			{"mainnet-seed.decred.netpurgatory.com", true},
			{"mainnet-seed.decred.org", true},
		},

		// Chain parameters
		GenesisBlock:             &genesisBlock,
		GenesisHash:              genesisBlock.BlockHash(),
		PowLimit:                 mainPowLimit,
		PowLimitBits:             0x1d00ffff,
		ReduceMinDifficulty:      false,
		MinDiffReductionTime:     0, // Does not apply since ReduceMinDifficulty false
		GenerateSupported:        false,
		MaximumBlockSizes:        []int{393216},
		MaxTxSize:                393216,
		TargetTimePerBlock:       time.Minute * 5,
		WorkDiffAlpha:            1,
		WorkDiffWindowSize:       144,
		WorkDiffWindows:          20,
		TargetTimespan:           time.Minute * 5 * 144, // TimePerBlock * WindowSize
		RetargetAdjustmentFactor: 4,

		// Subsidy parameters.
		BaseSubsidy:              3119582664, // 21m
		MulSubsidy:               100,
		DivSubsidy:               101,
		SubsidyReductionInterval: 6144,
		WorkRewardProportion:     6,
		StakeRewardProportion:    3,
		BlockTaxProportion:       1,

		// Checkpoints ordered from oldest to newest.
		Checkpoints: []Checkpoint{
			{440, newHashFromStr("0000000000002203eb2c95ee96906730bb56b2985e174518f90eb4db29232d93")},
			{24480, newHashFromStr("0000000000000c9d4239c4ef7ef3fb5aaeed940244bc69c57c8c5e1f071b28a6")},
			{48590, newHashFromStr("0000000000000d5e0de21a96d3c965f5f2db2c82612acd7389c140c9afe92ba7")},
			{54770, newHashFromStr("00000000000009293d067b1126b7de07fc9b2b94ee50dfe0d48c239a7adb072c")},
			{60720, newHashFromStr("0000000000000a64475d68ffb9ad89a3d147c0f5138db26b40da9d19d0004117")},
			{65270, newHashFromStr("0000000000000021f107601962789b201f0a0cbb98ac5f8c12b93d94e795b441")},
			{75380, newHashFromStr("0000000000000e7d13cfc85806aa720fe3670980f5b7d33253e4f41985558372")},
			{85410, newHashFromStr("00000000000013ec928074bea6eac9754aa614c7acb20edf300f18b0cd122692")},
			{99880, newHashFromStr("0000000000000cb2a9a9ded647b9f78aae51ace32dd8913701d420ead272913c")},
			{123080, newHashFromStr("000000000000009ea6e02d0f0424f445ed50686f9ae4aecdf3b268e981114477")},
			{135960, newHashFromStr("00000000000001d2f9bbca9177972c0ba45acb40836b72945a75d73b99079498")},
			{139740, newHashFromStr("00000000000001397179ae1aff156fb1aea228938d06b83e43b78b1c44527b5b")},
			{155900, newHashFromStr("000000000000008557e37fb05177fc5a54e693de20689753639135f85a2dcb2e")},
			{164300, newHashFromStr("000000000000009ed067ff51cd5e15f3c786222a5183b20a991a80ce535907a9")},
			{181020, newHashFromStr("00000000000000b77d832cb2cbed02908d69323862a53e56345400ad81a6fb8f")},
			{189950, newHashFromStr("000000000000007341d8ae2ea7e41f25cee00e1a70a4a3dc1cb055d14ecb2e11")},
			{214672, newHashFromStr("0000000000000021d5cbeead55cb7fd659f07e8127358929ffc34cd362209758")},
			{237310, newHashFromStr("000000000000000a6815e366425acd30354dfdcb55f401e38b037e87ca00f171")},
			{259810, newHashFromStr("0000000000000000ee0fbf469a9f32477ffbb46ebd7a280a53c842ab4243f97c")},
			{277940, newHashFromStr("000000000000000043b47c777bc96760e6fccc872cc8edb295b230dd8dd0f5d7")},
			{295940, newHashFromStr("0000000000000000148852c8a919addf4043f9f267b13c08df051d359f1622ca")},
			{318020, newHashFromStr("00000000000000002765c601fe4455126ab27913fcc2d2db28f78e1e6bb77266")},
			{340120, newHashFromStr("00000000000000001a9ba30acfd8272aa1514ce7979fc508118ee3764a19df46")},
			{362120, newHashFromStr("00000000000000000219580063387071893bcd0992cacb5f0aa55fc9e6c4a0ab")},
			{384170, newHashFromStr("00000000000000001704bbc6bda8c4864a71cd0febcc0b44d753c69d83840f04")},
			{404170, newHashFromStr("000000000000000010352022d88733bac2665c882030db071ce5ea29970fefd8")},
			{424170, newHashFromStr("00000000000000000b8526a9fdd31fcb249c992fc0741d422528ce2fa975bbd0")},
			{444170, newHashFromStr("00000000000000000673a109a997e8ca41bc4ece86445bc89c1bb2b9921633cc")},
			{464170, newHashFromStr("0000000000000000063c4588ffa1ff25978c025eaf529f39bcbad8b962502f65")},
			{483600, newHashFromStr("000000000000000010f98f7354b501b5747011c82d53b989dbcb368e5059ff9e")},
		},

		// MinKnownChainWork is the minimum amount of known total work for the
		// chain at a given point in time.  This is intended to be updated
		// periodically with new releases.
		//
		// Block 00000000000000000b639b99ec8b3097ed3dac076c455d30139db0d5958d4c4a
		// Height: 487720
		MinKnownChainWork: hexToBigInt("00000000000000000000000000000000000000000013e6909b5a73128d52fc6f"),

		// The miner confirmation window is defined as:
		//   target proof of work timespan / target proof of work spacing
		RuleChangeActivationQuorum:     4032, // 10 % of RuleChangeActivationInterval * TicketsPerBlock
		RuleChangeActivationMultiplier: 3,    // 75%
		RuleChangeActivationDivisor:    4,
		RuleChangeActivationInterval:   2016 * 4, // 4 weeks
		Deployments: map[uint32][]ConsensusDeployment{
			4: {{
				Vote: Vote{
					Id:          VoteIDSDiffAlgorithm,
					Description: "Change stake difficulty algorithm as defined in DCP0001",
					Mask:        0x0006, // Bits 1 and 2
					Choices: []Choice{{
						Id:          "abstain",
						Description: "abstain voting for change",
						Bits:        0x0000,
						IsAbstain:   true,
						IsNo:        false,
					}, {
						Id:          "no",
						Description: "keep the existing algorithm",
						Bits:        0x0002, // Bit 1
						IsAbstain:   false,
						IsNo:        true,
					}, {
						Id:          "yes",
						Description: "change to the new algorithm",
						Bits:        0x0004, // Bit 2
						IsAbstain:   false,
						IsNo:        false,
					}},
				},
				StartTime:  1493164800, // Apr 26th, 2017
				ExpireTime: 1524700800, // Apr 26th, 2018
			}, {
				Vote: Vote{
					Id:          VoteIDLNSupport,
					Description: "Request developers begin work on Lightning Network (LN) integration",
					Mask:        0x0018, // Bits 3 and 4
					Choices: []Choice{{
						Id:          "abstain",
						Description: "abstain from voting",
						Bits:        0x0000,
						IsAbstain:   true,
						IsNo:        false,
					}, {
						Id:          "no",
						Description: "no, do not work on integrating LN support",
						Bits:        0x0008, // Bit 3
						IsAbstain:   false,
						IsNo:        true,
					}, {
						Id:          "yes",
						Description: "yes, begin work on integrating LN support",
						Bits:        0x0010, // Bit 4
						IsAbstain:   false,
						IsNo:        false,
					}},
				},
				StartTime:  1493164800, // Apr 26th, 2017
				ExpireTime: 1508976000, // Oct 26th, 2017
			}},
			5: {{
				Vote: Vote{
					Id:          VoteIDLNFeatures,
					Description: "Enable features defined in DCP0002 and DCP0003 necessary to support Lightning Network (LN)",
					Mask:        0x0006, // Bits 1 and 2
					Choices: []Choice{{
						Id:          "abstain",
						Description: "abstain voting for change",
						Bits:        0x0000,
						IsAbstain:   true,
						IsNo:        false,
					}, {
						Id:          "no",
						Description: "keep the existing consensus rules",
						Bits:        0x0002, // Bit 1
						IsAbstain:   false,
						IsNo:        true,
					}, {
						Id:          "yes",
						Description: "change to the new consensus rules",
						Bits:        0x0004, // Bit 2
						IsAbstain:   false,
						IsNo:        false,
					}},
				},
				StartTime:  1505260800, // Sep 13th, 2017
				ExpireTime: 1536796800, // Sep 13th, 2018
			}},
			6: {{
				Vote: Vote{
					Id:          VoteIDFixLNSeqLocks,
					Description: "Modify sequence lock handling as defined in DCP0004",
					Mask:        0x0006, // Bits 1 and 2
					Choices: []Choice{{
						Id:          "abstain",
						Description: "abstain voting for change",
						Bits:        0x0000,
						IsAbstain:   true,
						IsNo:        false,
					}, {
						Id:          "no",
						Description: "keep the existing consensus rules",
						Bits:        0x0002, // Bit 1
						IsAbstain:   false,
						IsNo:        true,
					}, {
						Id:          "yes",
						Description: "change to the new consensus rules",
						Bits:        0x0004, // Bit 2
						IsAbstain:   false,
						IsNo:        false,
					}},
				},
				StartTime:  1548633600, // Jan 28th, 2019
				ExpireTime: 1580169600, // Jan 28th, 2020
			}},
			7: {{
				Vote: Vote{
					Id:          VoteIDHeaderCommitments,
					Description: "Enable header commitments as defined in DCP0005",
					Mask:        0x0006, // Bits 1 and 2
					Choices: []Choice{{
						Id:          "abstain",
						Description: "abstain voting for change",
						Bits:        0x0000,
						IsAbstain:   true,
						IsNo:        false,
					}, {
						Id:          "no",
						Description: "keep the existing consensus rules",
						Bits:        0x0002, // Bit 1
						IsAbstain:   false,
						IsNo:        true,
					}, {
						Id:          "yes",
						Description: "change to the new consensus rules",
						Bits:        0x0004, // Bit 2
						IsAbstain:   false,
						IsNo:        false,
					}},
				},
				StartTime:  1567641600, // Sep 5th, 2019
				ExpireTime: 1599264000, // Sep 5th, 2020
			}},
			8: {{
				Vote: Vote{
					Id:          VoteIDTreasury,
					Description: "Enable decentralized Treasury opcodes as defined in DCP0006",
					Mask:        0x0006, // Bits 1 and 2
					Choices: []Choice{{
						Id:          "abstain",
						Description: "abstain voting for change",
						Bits:        0x0000,
						IsAbstain:   true,
						IsNo:        false,
					}, {
						Id:          "no",
						Description: "keep the existing consensus rules",
						Bits:        0x0002, // Bit 1
						IsAbstain:   false,
						IsNo:        true,
					}, {
						Id:          "yes",
						Description: "change to the new consensus rules",
						Bits:        0x0004, // Bit 2
						IsAbstain:   false,
						IsNo:        false,
					}},
				},
				StartTime:  1596240000, // Aug 1st, 2020
				ExpireTime: 1627776000, // Aug 1st, 2021
			}},
		},

		// Enforce current block version once majority of the network has
		// upgraded.
		// 75% (750 / 1000)
		//
		// Reject previous block versions once a majority of the network has
		// upgraded.
		// 95% (950 / 1000)
		BlockEnforceNumRequired: 750,
		BlockRejectNumRequired:  950,
		BlockUpgradeNumToCheck:  1000,

		// AcceptNonStdTxs is a mempool param to either accept and relay non
		// standard txs to the network or reject them
		AcceptNonStdTxs: false,

		// Address encoding magics
		NetworkAddressPrefix: "D",
		PubKeyAddrID:         [2]byte{0x13, 0x86}, // starts with Dk
		PubKeyHashAddrID:     [2]byte{0x07, 0x3f}, // starts with Ds
		PKHEdwardsAddrID:     [2]byte{0x07, 0x1f}, // starts with De
		PKHSchnorrAddrID:     [2]byte{0x07, 0x01}, // starts with DS
		ScriptHashAddrID:     [2]byte{0x07, 0x1a}, // starts with Dc
		PrivateKeyID:         [2]byte{0x22, 0xde}, // starts with Pm

		// BIP32 hierarchical deterministic extended key magics
		HDPrivateKeyID: [4]byte{0x02, 0xfd, 0xa4, 0xe8}, // starts with dprv
		HDPublicKeyID:  [4]byte{0x02, 0xfd, 0xa9, 0x26}, // starts with dpub

		// BIP44 coin type used in the hierarchical deterministic path for
		// address generation.
		SLIP0044CoinType: 42, // SLIP0044, Decred
		LegacyCoinType:   20, // for backwards compatibility

		// Decred PoS parameters
		MinimumStakeDiff:        2 * 1e8, // 2 Coin
		TicketPoolSize:          8192,
		TicketsPerBlock:         5,
		TicketMaturity:          256,
		TicketExpiry:            40960, // 5*TicketPoolSize
		CoinbaseMaturity:        256,
		SStxChangeMaturity:      1,
		TicketPoolSizeWeight:    4,
		StakeDiffAlpha:          1, // Minimal
		StakeDiffWindowSize:     144,
		StakeDiffWindows:        20,
		StakeVersionInterval:    144 * 2 * 7, // ~1 week
		MaxFreshStakePerBlock:   20,          // 4*TicketsPerBlock
		StakeEnabledHeight:      256 + 256,   // CoinbaseMaturity + TicketMaturity
		StakeValidationHeight:   4096,        // ~14 days
		StakeBaseSigScript:      []byte{0x00, 0x00},
		StakeMajorityMultiplier: 3,
		StakeMajorityDivisor:    4,

		// Decred organization related parameters
		// Organization address is Dcur2mcGjmENx4DhNqDctW5wJCVyT3Qeqkx
		OrganizationPkScript:        hexDecode("a914f5916158e3e2c4551c1796708db8367207ed13bb87"),
		OrganizationPkScriptVersion: 0,
		BlockOneLedger:              tokenPayouts_MainNetParams(),

		// Sanctioned Politeia keys.
		PiKeys: [][]byte{
			hexDecode("03f6e7041f1cf51ee10e0a01cd2b0385ce3cd9debaabb2296f7e9dee9329da946c"),
			hexDecode("0319a37405cb4d1691971847d7719cfce70857c0f6e97d7c9174a3998cf0ab86dd"),
		},

		// ~1 day for tspend inclusion
		TreasuryVoteInterval: 288,

		// ~7.2 days for short circuit approval, ~42%
		// target=ticket-pool-equivalent participation
		TreasuryVoteIntervalMultiplier: 12,

		// Sum of tspends within any ~24 day window cannot exceed
		// policy check
		TreasuryExpenditureWindow: 2,

		// policy check is average of prior ~4.8 months + a 50%
		// increase allowance
		TreasuryExpenditurePolicy: 6,

		// 16000 dcr/tew as expense bootstrap
		TreasuryExpenditureBootstrap: 16000 * 1e8,

		TreasuryVoteQuorumMultiplier:   1, // 20% quorum required
		TreasuryVoteQuorumDivisor:      5,
		TreasuryVoteRequiredMultiplier: 3, // 60% yes votes required
		TreasuryVoteRequiredDivisor:    5,

		seeders: []string{
			"mainnet-seed-1.decred.org",
			"mainnet-seed-2.decred.org",
			"mainnet-seed.planetdecred.org",
			"mainnet-seed.dcrdata.org",
			"mainnet-seed.jholdstock.uk",
		},
	}
}