chainparams.cpp

// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <chainparams.h>

#include <chainparamsseeds.h>
#include <consensus/merkle.h>
#include <deploymentinfo.h>
#include <hash.h> // for signet block challenge hash
#include <util/system.h>

#include <assert.h>

#include <boost/algorithm/string/classification.hpp>
#include <boost/algorithm/string/split.hpp>

static CBlock CreateGenesisBlock(const char* pszTimestamp, const CScript& genesisOutputScript, uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
{
    CMutableTransaction txNew;
    txNew.nVersion = 1;
    txNew.vin.resize(1);
    txNew.vout.resize(1);
    txNew.vin[0].scriptSig = CScript() << 0 << CScriptNum(999) << std::vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
    txNew.vout[0].nValue = genesisReward;
    txNew.vout[0].scriptPubKey = genesisOutputScript;

    CBlock genesis;
    genesis.nTime    = nTime;
    genesis.nBits    = nBits;
    genesis.nNonce   = nNonce;
    genesis.nVersion = nVersion;
    genesis.vtx.push_back(MakeTransactionRef(std::move(txNew)));
    genesis.hashPrevBlock.SetNull();
    genesis.hashMerkleRoot = BlockMerkleRoot(genesis);
    return genesis;
}

/**
 * Build the genesis block. Note that the output of its generation
 * transaction cannot be spent since it did not originally exist in the
 * database.
 *
 * CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
 *   CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
 *     CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
 *     CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
 *   vMerkleTree: 4a5e1e
 */
static CBlock CreateGenesisBlock(uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
{
    const char* pszTimestamp = "01/09/2014 Germany to Help in Disposal of Syrian Chemical Weapons";
    const CScript genesisOutputScript = CScript();
    return CreateGenesisBlock(pszTimestamp, genesisOutputScript, nTime, nNonce, nBits, nVersion, genesisReward);
}

/**
 * Main network on which people trade goods and services.
 */
class CMainParams : public CChainParams {
public:
    CMainParams() {
        strNetworkID = CBaseChainParams::MAIN;
        consensus.signet_blocks = false;
        consensus.signet_challenge.clear();
        consensus.nSubsidyHalvingInterval = 840000;
        consensus.BIP16Exception = uint256{};
        consensus.BIP34Height = 691488;
        consensus.BIP34Hash = uint256S("0x1d0446fe48fdebf4780f544f1de81c2527099da2d09465873475cefe96ab84a1");
        consensus.BIP65Height = 691488;
        consensus.BIP66Height = 691488;
        consensus.CSVHeight = 691488;
        consensus.SegwitHeight = 713664;
        consensus.MinBIP9WarningHeight = 715680; // segwit activation height + miner confirmation window

        // powLimit should not be too high to produce blocks 2.5 mins apart.
        consensus.powLimit = uint256S("0007ffffffffffffffffffffffffffffffffffffffffffffffffffffffffff80");
        // Value for previous forks
        consensus.preVerthashPowLimit = uint256S("00000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");

        consensus.nPowTargetTimespan = 3.5 * 24 * 60 * 60; // 3.5 days
        consensus.nPowTargetSpacing = 2.5 * 60;
        consensus.fPowAllowMinDifficultyBlocks = false;
        consensus.fPowNoRetargeting = false;
        consensus.nRuleChangeActivationThreshold = 1512; // 75% of 2016
        consensus.nMinerConfirmationWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = Consensus::BIP9Deployment::NEVER_ACTIVE;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].min_activation_height = 0; // No activation delay

        // Deployment of Taproot (BIPs 340-342)
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].bit = 2;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartTime = 1625097600; // July 1, 2021
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = 1628899200; // August 14, 2021
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 1623304; // Approximately September 1, 2021

        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000000ea486815b14b61400");
        consensus.defaultAssumeValid = uint256S("0x8d45b551b45904d28ba69dc7112ff7793e5f229d9f1eb10bd105afbca9c4b783"); //2046000

        /**
         * The message start string is designed to be unlikely to occur in normal data.
         * The characters are rarely used upper ASCII, not valid as UTF-8, and produce
         * a large 32-bit integer with any alignment.
         */
        pchMessageStart[0] = 0xfa;
        pchMessageStart[1] = 0xbf;
        pchMessageStart[2] = 0xb5;
        pchMessageStart[3] = 0xda;
        nDefaultPort = 5889;
        nPruneAfterHeight = 100000;
        m_assumed_blockchain_size = 7;
        m_assumed_chain_state_size = 1;

        genesis = CreateGenesisBlock(1389311371, 5749262, 0x1e0ffff0, 1, 50 * COIN);
        consensus.hashGenesisBlock = genesis.GetHash();
        assert(consensus.hashGenesisBlock == uint256S("0x4d96a915f49d40b1e5c2844d1ee2dccb90013a990ccea12c492d22110489f0c4"));
        assert(genesis.hashMerkleRoot == uint256S("0x4af38ca0e323c0a5226208a73b7589a52c030f234810cf51e13e3249fc0123e7"));

        vSeeds.emplace_back("useast1.vtconline.org"); // James Lovejoy
        vSeeds.emplace_back("vtc.gertjaap.org"); // Gert-Jaap Glasbergen
        vSeeds.emplace_back("vert.idzstad.pl"); // Jaroslaw (jk_14)
        vSeeds.emplace_back("vtcseed.javerity.com"); // Matt C. (cruelnovo)
        vSeeds.emplace_back("dnsseed.vertcoin.cc"); // DB Keys

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,71);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,5);
        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,128);
        base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x88, 0xB2, 0x1E};
        base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x88, 0xAD, 0xE4};

        bech32_hrp = "vtc";

        vFixedSeeds = std::vector<uint8_t>(std::begin(chainparams_seed_main), std::end(chainparams_seed_main));

        fDefaultConsistencyChecks = false;
        fRequireStandard = true;
        m_is_test_chain = false;
        m_is_mockable_chain = false;

        checkpointData = {
            {
                {      0, uint256S("0x4d96a915f49d40b1e5c2844d1ee2dccb90013a990ccea12c492d22110489f0c4")},
                {  24200, uint256S("0xd7ed819858011474c8b0cae4ad0b9bdbb745becc4c386bc22d1220cc5a4d1787")},
                {  65000, uint256S("0x9e673a69c35a423f736ab66f9a195d7c42f979847a729c0f3cef2c0b8b9d0289")},
                {  84065, uint256S("0xa904170a5a98109b2909379d9bc03ef97a6b44d5dafbc9084b8699b0cba5aa98")},
                {  228023, uint256S("0x15c94667a9e941359d2ee6527e2876db1b5e7510a5ded3885ca02e7e0f516b51")},
                {  346992, uint256S("0xf1714fa4c7990f4b3d472eb22132891ccd3c7ad7208e2d1ab15bde68854fb0ee")},
                {  347269, uint256S("0xfa1e592b7ea2aa97c5f20ccd7c40f3aaaeb31d1232c978847a79f28f83b6c22a")},
                {  430000, uint256S("0x2f5703cf7b6f956b84fd49948cbf49dc164cfcb5a7b55903b1c4f53bc7851611")},
                {  516999, uint256S("0x572ed47da461743bcae526542053e7bc532de299345e4f51d77786f2870b7b28")},
                {  627610, uint256S("0x6000a787f2d8bb77d4f491a423241a4cc8439d862ca6cec6851aba4c79ccfedc")},
                {  1172000, uint256S("0x13311f001ad833853d714d1b0425f76004373cb2286a4e5094a811b8a4246147")},
                {  1474747, uint256S("0xedf23a98cc196888635a01ba4672680df0b7c16eb48146e706b6f2e669974934")},
                {  1740000, uint256S("0x3a9d0a6b19f4c20959caef1bad1a7aa18e492c049327ccaf3b3fcf7c3815f4e0")},
            }
        };

        m_assumeutxo_data = MapAssumeutxo{
         // TODO to be specified in a future patch.
        };

        chainTxData = ChainTxData{
            // Data from rpc: getchaintxstats 16384 8d45b551b45904d28ba69dc7112ff7793e5f229d9f1eb10bd105afbca9c4b783
            1694046637, // nTime
            5566381,  // nTxCount
            0.01130516952117601 // dTxRate
        };
    }
};

/**
 * Testnet (v3): public test network which is reset from time to time.
 */
class CTestNetParams : public CChainParams {
public:
    CTestNetParams() {
        strNetworkID = CBaseChainParams::TESTNET;
        consensus.signet_blocks = false;
        consensus.signet_challenge.clear();
        consensus.nSubsidyHalvingInterval = 840000;
        consensus.BIP16Exception = uint256{};
        consensus.BIP34Height = 300;
        consensus.BIP34Hash = uint256S("0xd6be7cfec4fb1d6a8a94f0a423520a78c97fbdc766cd25f9512adc9249282c2a");
        consensus.BIP65Height = 300;
        consensus.BIP66Height = 300;
        consensus.CSVHeight = 300;
        consensus.SegwitHeight = 300;
        consensus.MinBIP9WarningHeight = 350; // segwit activation height + miner confirmation window

        // powLimit should not be too high to produce blocks 2.5 mins apart.
        consensus.powLimit = uint256S("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
        // Value for previous forks
        consensus.preVerthashPowLimit = uint256S("00000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
        consensus.nPowTargetTimespan = 3.5 * 24 * 60 * 60; // two weeks
        consensus.nPowTargetSpacing = 2.5 * 60;
        consensus.fPowAllowMinDifficultyBlocks = true;
        consensus.fPowNoRetargeting = false;
        consensus.nRuleChangeActivationThreshold = 26; // 75% for testchains
        consensus.nMinerConfirmationWindow = 50; // nPowTargetTimespan / nPowTargetSpacing
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = Consensus::BIP9Deployment::NEVER_ACTIVE;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].min_activation_height = 0; // No activation delay

        // Deployment of Taproot (BIPs 340-342)
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].bit = 2;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartTime = 1621296000; // May 18, 2021
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = 1630713600; // September 4, 2021
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 0; // No activation delay

        consensus.nMinimumChainWork = uint256S("00000000000000000000000000000000000000000000000000016f80e95b3727");
        consensus.defaultAssumeValid = uint256S("0x584306547f33e3cdeab59d49e13d7ad863b9b54b8e5c5b0dc4c1863ed710a881"); // 700000

        pchMessageStart[0] = 'v';
        pchMessageStart[1] = 'e';
        pchMessageStart[2] = 'r';
        pchMessageStart[3] = 't';
        nDefaultPort = 15889;
        nPruneAfterHeight = 1000;
        m_assumed_blockchain_size = 1;
        m_assumed_chain_state_size = 1;

        genesis = CreateGenesisBlock(1481291250, 915027, 0x1e0ffff0, 1, 50 * COIN);
        consensus.hashGenesisBlock = genesis.GetHash();
        assert(consensus.hashGenesisBlock == uint256S("0xcee8f24feb7a64c8f07916976aa4855decac79b6741a8ec2e32e2747497ad2c9"));
        assert(genesis.hashMerkleRoot == uint256S("0x4af38ca0e323c0a5226208a73b7589a52c030f234810cf51e13e3249fc0123e7"));

        vFixedSeeds.clear();
        vSeeds.clear();
        // nodes with support for servicebits filtering should be at the top
        vSeeds.emplace_back("tvtcseed.javerity.com"); // Matt C. (cruelnovo)

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,74);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,196);
        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,239);
        base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
        base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};

        bech32_hrp = "tvtc";

        vFixedSeeds = std::vector<uint8_t>(std::begin(chainparams_seed_test), std::end(chainparams_seed_test));

        fDefaultConsistencyChecks = false;
        fRequireStandard = false;
        m_is_test_chain = true;
        m_is_mockable_chain = false;

        checkpointData = {
            {
                {0, uint256S("cee8f24feb7a64c8f07916976aa4855decac79b6741a8ec2e32e2747497ad2c9")},
                {160000, uint256S("3e5da83cea2056869b6792446e78f82e43f96716e0623833c3d1e030456a88e3")},
                {232000, uint256S("0046e2d75adc14d355a2904ac68756cb12a0252f07da05dbf36137aeab39889a")},
            }
        };

        m_assumeutxo_data = MapAssumeutxo{
            // TODO to be specified in a future patch.
        };

        chainTxData = ChainTxData{
            // Data from RPC: getchaintxstats 16384 584306547f33e3cdeab59d49e13d7ad863b9b54b8e5c5b0dc4c1863ed710a881
            /* nTime    */ 1688217334,
            /* nTxCount */ 706731,
            /* dTxRate  */ 0.006687625362362025,
        };
    }
};

/**
 * Signet: test network with an additional consensus parameter (see BIP325).
 */
class SigNetParams : public CChainParams {
public:
    explicit SigNetParams(const ArgsManager& args) {
        std::vector<uint8_t> bin;
        vSeeds.clear();

        if (!args.IsArgSet("-signetchallenge")) {
            bin = ParseHex("512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be430210359ef5021964fe22d6f8e05b2463c9540ce96883fe3b278760f048f5189f2e6c452ae");
            vSeeds.emplace_back("178.128.221.177");
            vSeeds.emplace_back("2a01:7c8:d005:390::5");
            vSeeds.emplace_back("v7ajjeirttkbnt32wpy3c6w3emwnfr3fkla7hpxcfokr3ysd3kqtzmqd.onion:38333");

            consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000000000008546553c03");
            consensus.defaultAssumeValid = uint256S("0x000000187d4440e5bff91488b700a140441e089a8aaea707414982460edbfe54"); // 47200
            m_assumed_blockchain_size = 1;
            m_assumed_chain_state_size = 0;
            chainTxData = ChainTxData{
                // Data from RPC: getchaintxstats 4096 000000187d4440e5bff91488b700a140441e089a8aaea707414982460edbfe54
                /* nTime    */ 1626696658,
                /* nTxCount */ 387761,
                /* dTxRate  */ 0.04035946932424404,
            };
        } else {
            const auto signet_challenge = args.GetArgs("-signetchallenge");
            if (signet_challenge.size() != 1) {
                throw std::runtime_error(strprintf("%s: -signetchallenge cannot be multiple values.", __func__));
            }
            bin = ParseHex(signet_challenge[0]);

            consensus.nMinimumChainWork = uint256{};
            consensus.defaultAssumeValid = uint256{};
            m_assumed_blockchain_size = 0;
            m_assumed_chain_state_size = 0;
            chainTxData = ChainTxData{
                0,
                0,
                0,
            };
            LogPrintf("Signet with challenge %s\n", signet_challenge[0]);
        }

        if (args.IsArgSet("-signetseednode")) {
            vSeeds = args.GetArgs("-signetseednode");
        }

        strNetworkID = CBaseChainParams::SIGNET;
        consensus.signet_blocks = true;
        consensus.signet_challenge.assign(bin.begin(), bin.end());
        consensus.nSubsidyHalvingInterval = 210000;
        consensus.BIP16Exception = uint256{};
        consensus.BIP34Height = 1;
        consensus.BIP34Hash = uint256{};
        consensus.BIP65Height = 1;
        consensus.BIP66Height = 1;
        consensus.CSVHeight = 1;
        consensus.SegwitHeight = 1;
        consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
        consensus.nPowTargetSpacing = 10 * 60;
        consensus.fPowAllowMinDifficultyBlocks = false;
        consensus.fPowNoRetargeting = false;
        consensus.nRuleChangeActivationThreshold = 1815; // 90% of 2016
        consensus.nMinerConfirmationWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
        consensus.MinBIP9WarningHeight = 0;
        consensus.powLimit = uint256S("00000377ae000000000000000000000000000000000000000000000000000000");
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = Consensus::BIP9Deployment::NEVER_ACTIVE;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].min_activation_height = 0; // No activation delay

        // Activation of Taproot (BIPs 340-342)
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].bit = 2;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartTime = Consensus::BIP9Deployment::ALWAYS_ACTIVE;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 0; // No activation delay

        // message start is defined as the first 4 bytes of the sha256d of the block script
        CHashWriter h(SER_DISK, 0);
        h << consensus.signet_challenge;
        uint256 hash = h.GetHash();
        memcpy(pchMessageStart, hash.begin(), 4);

        nDefaultPort = 38333;
        nPruneAfterHeight = 1000;

        genesis = CreateGenesisBlock(1598918400, 52613770, 0x1e0377ae, 1, 50 * COIN);
        consensus.hashGenesisBlock = genesis.GetHash();
        assert(consensus.hashGenesisBlock == uint256S("0xc5e39ee7150e81738eb9fdeabe2d5c7d533eeea2ddd42bbaf531a040a0b25179"));
        assert(genesis.hashMerkleRoot == uint256S("0x4af38ca0e323c0a5226208a73b7589a52c030f234810cf51e13e3249fc0123e7"));

        vFixedSeeds.clear();

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,75);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,196);
        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,239);
        base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
        base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};

        bech32_hrp = "svtc";

        fDefaultConsistencyChecks = false;
        fRequireStandard = true;
        m_is_test_chain = true;
        m_is_mockable_chain = false;
    }
};

/**
 * Regression test: intended for private networks only. Has minimal difficulty to ensure that
 * blocks can be found instantly.
 */
class CRegTestParams : public CChainParams {
public:
    explicit CRegTestParams(const ArgsManager& args) {
        strNetworkID = CBaseChainParams::REGTEST;
        consensus.signet_blocks = false;
        consensus.signet_challenge.clear();
        consensus.nSubsidyHalvingInterval = 150;
        consensus.BIP16Exception = uint256();
        consensus.BIP34Height = 1; // Always active unless overridden
        consensus.BIP34Hash = uint256();
        consensus.BIP65Height = 1;  // Always active unless overridden
        consensus.BIP66Height = 1;  // Always active unless overridden
        consensus.CSVHeight = 1;    // Always active unless overridden
        consensus.SegwitHeight = 0; // Always active unless overridden
        consensus.MinBIP9WarningHeight = 0;
        consensus.powLimit = uint256S("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
        consensus.preVerthashPowLimit = consensus.powLimit;
        consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
        consensus.nPowTargetSpacing = 10 * 60;
        consensus.fPowAllowMinDifficultyBlocks = true;
        consensus.fPowNoRetargeting = true;
        consensus.nRuleChangeActivationThreshold = 108; // 75% for testchains
        consensus.nMinerConfirmationWindow = 144; // Faster than normal for regtest (144 instead of 2016)

        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 0;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].min_activation_height = 0; // No activation delay

        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].bit = 2;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartTime = Consensus::BIP9Deployment::ALWAYS_ACTIVE;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 0; // No activation delay

        consensus.nMinimumChainWork = uint256{};
        consensus.defaultAssumeValid = uint256{};

        pchMessageStart[0] = 0xfa;
        pchMessageStart[1] = 0xbe;
        pchMessageStart[2] = 0xb5;
        pchMessageStart[3] = 0xdb;
        nDefaultPort = 18444;
        nPruneAfterHeight = args.GetBoolArg("-fastprune", false) ? 100 : 1000;
        m_assumed_blockchain_size = 0;
        m_assumed_chain_state_size = 0;

        UpdateActivationParametersFromArgs(args);

        genesis = CreateGenesisBlock(1296688602, 2, 0x207fffff, 1, 50 * COIN);
        consensus.hashGenesisBlock = genesis.GetHash();
        assert(consensus.hashGenesisBlock == uint256S("0x2399c0b047ebbbd1650d66867206c97317027b1a1932bc6fc17ce833dc4a85ce"));
        assert(genesis.hashMerkleRoot == uint256S("0x4af38ca0e323c0a5226208a73b7589a52c030f234810cf51e13e3249fc0123e7"));

        vFixedSeeds.clear(); //!< Regtest mode doesn't have any fixed seeds.
        vSeeds.clear();
        vSeeds.emplace_back("dummySeed.invalid.");

        fDefaultConsistencyChecks = true;
        fRequireStandard = true;
        m_is_test_chain = true;
        m_is_mockable_chain = true;

        checkpointData = {
            {
                {0, uint256S("2399c0b047ebbbd1650d66867206c97317027b1a1932bc6fc17ce833dc4a85ce")},
            }
        };

        m_assumeutxo_data = MapAssumeutxo{
            {
                110,
                {AssumeutxoHash{uint256S("0x1ebbf5850204c0bdb15bf030f47c7fe91d45c44c712697e4509ba67adb01c618")}, 110},
            },
            {
                200,
                {AssumeutxoHash{uint256S("0x51c8d11d8b5c1de51543c579736e786aa2736206d1e11e627568029ce092cf62")}, 200},
            },
        };

        chainTxData = ChainTxData{
            0,
            0,
            0
        };

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,74);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,196);
        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,239);
        base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
        base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};

        bech32_hrp = "rvtc";
    }

    /**
     * Allows modifying the Version Bits regtest parameters.
     */
    void UpdateVersionBitsParameters(Consensus::DeploymentPos d, int64_t nStartTime, int64_t nTimeout, int min_activation_height)
    {
        consensus.vDeployments[d].nStartTime = nStartTime;
        consensus.vDeployments[d].nTimeout = nTimeout;
        consensus.vDeployments[d].min_activation_height = min_activation_height;
    }
    void UpdateActivationParametersFromArgs(const ArgsManager& args);
};

static void MaybeUpdateHeights(const ArgsManager& args, Consensus::Params& consensus)
{
    for (const std::string& arg : args.GetArgs("-testactivationheight")) {
        const auto found{arg.find('@')};
        if (found == std::string::npos) {
            throw std::runtime_error(strprintf("Invalid format (%s) for -testactivationheight=name@height.", arg));
        }
        const auto name{arg.substr(0, found)};
        const auto value{arg.substr(found + 1)};
        int32_t height;
        if (!ParseInt32(value, &height) || height < 0 || height >= std::numeric_limits<int>::max()) {
            throw std::runtime_error(strprintf("Invalid height value (%s) for -testactivationheight=name@height.", arg));
        }
        if (name == "segwit") {
            consensus.SegwitHeight = int{height};
        } else if (name == "bip34") {
            consensus.BIP34Height = int{height};
        } else if (name == "dersig") {
            consensus.BIP66Height = int{height};
        } else if (name == "cltv") {
            consensus.BIP65Height = int{height};
        } else if (name == "csv") {
            consensus.CSVHeight = int{height};
        } else {
            throw std::runtime_error(strprintf("Invalid name (%s) for -testactivationheight=name@height.", arg));
        }
    }
}

void CRegTestParams::UpdateActivationParametersFromArgs(const ArgsManager& args)
{
    MaybeUpdateHeights(args, consensus);

    if (!args.IsArgSet("-vbparams")) return;

    for (const std::string& strDeployment : args.GetArgs("-vbparams")) {
        std::vector<std::string> vDeploymentParams;
        boost::split(vDeploymentParams, strDeployment, boost::is_any_of(":"));
        if (vDeploymentParams.size() < 3 || 4 < vDeploymentParams.size()) {
            throw std::runtime_error("Version bits parameters malformed, expecting deployment:start:end[:min_activation_height]");
        }
        int64_t nStartTime, nTimeout;
        int min_activation_height = 0;
        if (!ParseInt64(vDeploymentParams[1], &nStartTime)) {
            throw std::runtime_error(strprintf("Invalid nStartTime (%s)", vDeploymentParams[1]));
        }
        if (!ParseInt64(vDeploymentParams[2], &nTimeout)) {
            throw std::runtime_error(strprintf("Invalid nTimeout (%s)", vDeploymentParams[2]));
        }
        if (vDeploymentParams.size() >= 4 && !ParseInt32(vDeploymentParams[3], &min_activation_height)) {
            throw std::runtime_error(strprintf("Invalid min_activation_height (%s)", vDeploymentParams[3]));
        }
        bool found = false;
        for (int j=0; j < (int)Consensus::MAX_VERSION_BITS_DEPLOYMENTS; ++j) {
            if (vDeploymentParams[0] == VersionBitsDeploymentInfo[j].name) {
                UpdateVersionBitsParameters(Consensus::DeploymentPos(j), nStartTime, nTimeout, min_activation_height);
                found = true;
                LogPrintf("Setting version bits activation parameters for %s to start=%ld, timeout=%ld, min_activation_height=%d\n", vDeploymentParams[0], nStartTime, nTimeout, min_activation_height);
                break;
            }
        }
        if (!found) {
            throw std::runtime_error(strprintf("Invalid deployment (%s)", vDeploymentParams[0]));
        }
    }
}

static std::unique_ptr<const CChainParams> globalChainParams;

const CChainParams &Params() {
    assert(globalChainParams);
    return *globalChainParams;
}

std::unique_ptr<const CChainParams> CreateChainParams(const ArgsManager& args, const std::string& chain)
{
    if (chain == CBaseChainParams::MAIN) {
        return std::unique_ptr<CChainParams>(new CMainParams());
    } else if (chain == CBaseChainParams::TESTNET) {
        return std::unique_ptr<CChainParams>(new CTestNetParams());
    } else if (chain == CBaseChainParams::SIGNET) {
        return std::unique_ptr<CChainParams>(new SigNetParams(args));
    } else if (chain == CBaseChainParams::REGTEST) {
        return std::unique_ptr<CChainParams>(new CRegTestParams(args));
    }
    throw std::runtime_error(strprintf("%s: Unknown chain %s.", __func__, chain));
}

void SelectParams(const std::string& network)
{
    SelectBaseParams(network);
    globalChainParams = CreateChainParams(gArgs, network);
}