chainparams.cpp

// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 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 <hash.h> // for signet block challenge hash
#include <tinyformat.h>
#include <util/system.h>
#include <util/strencodings.h>
#include <versionbitsinfo.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() << 486604799 << CScriptNum(4) << 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 = "NY Times 05/Oct/2011 Steve Jobs, Apple’s Visionary, Dies at 56";
    const CScript genesisOutputScript = CScript() << ParseHex("040184710fa689ad5023690c80f3a49c8f13f8d45b8c857fbcbc8bc4a8e4d3eb4b10f4d4604fa08dce601aaf0f470216fe1b51850b4acf21b179c45070ac7b03a9") << OP_CHECKSIG;
    return CreateGenesisBlock(pszTimestamp, genesisOutputScript, nTime, nNonce, nBits, nVersion, genesisReward);
}

/**
 * Main network
 */
class CMainParams : public CChainParams {
public:
    CMainParams() {
        strNetworkID = CBaseChainParams::MAIN;
        consensus.signet_blocks = false;
        consensus.signet_challenge.clear();
        consensus.nSubsidyHalvingInterval = 840000;
        consensus.BIP16Height = 218579; // 87afb798a3ad9378fcd56123c81fb31cfd9a8df4719b9774d71730c16315a092 - October 1, 2012
        consensus.BIP34Height = 710000;
        consensus.BIP34Hash = uint256S("0xfa09d204a83a768ed5a7c8d441fa62f2043abf420cff1226c7b4329aeb9d51cf");
        consensus.BIP65Height = 918684; // bab3041e8977e0dc3eeff63fe707b92bde1dd449d8efafb248c27c8264cc311a
        consensus.BIP66Height = 811879; // 7aceee012833fa8952f8835d8b1b3ae233cd6ab08fdb27a771d2bd7bdc491894
        consensus.CSVHeight = 1201536; // 53e0af7626f7f51ce9f3b6cfc36508a5b1d2f6c4a75ac215dc079442692a4c0b
        consensus.SegwitHeight = 1201536; // 0000000000000000001c8018d9cb3b742ef25114f27563e3fc4a1902167f9893
        consensus.MinBIP9WarningHeight = 1209600; // segwit activation height + miner confirmation window
        consensus.powLimit = 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 = 6048; // 75% of 8064
        consensus.nMinerConfirmationWindow = 8064; // nPowTargetTimespan / nPowTargetSpacing * 4
        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;

        // Deployment of Taproot (BIPs 340-342)
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].bit = 2;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartHeight = 2161152; // End November 2021
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeoutHeight = 2370816; // 364 days later

        // Deployment of MWEB (LIP-0002, LIP-0003, and LIP-0004)
        consensus.vDeployments[Consensus::DEPLOYMENT_MWEB].bit = 4;
        consensus.vDeployments[Consensus::DEPLOYMENT_MWEB].nStartHeight = 2217600; // End Feb 2022
        consensus.vDeployments[Consensus::DEPLOYMENT_MWEB].nTimeoutHeight = 2427264; // 364 days later

        consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000702edaa57d42a9fd9e2");
        consensus.defaultAssumeValid = uint256S("0x62e2e3d21343a00994d38a63524867507dbeee6850e8fbf02e9c47a3ccf82f24"); // 2186382

        /**
         * 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] = 0xfb;
        pchMessageStart[1] = 0xc0;
        pchMessageStart[2] = 0xb6;
        pchMessageStart[3] = 0xdb;
        nDefaultPort = 9333;
        nPruneAfterHeight = 100000;
        m_assumed_blockchain_size = 40;
        m_assumed_chain_state_size = 2;

        genesis = CreateGenesisBlock(1317972665, 2084524493, 0x1e0ffff0, 1, 50 * COIN);
        consensus.hashGenesisBlock = genesis.GetHash();
        assert(consensus.hashGenesisBlock == uint256S("0x12a765e31ffd4059bada1e25190f6e98c99d9714d334efa41a195a7e7e04bfe2"));
        assert(genesis.hashMerkleRoot == uint256S("0x97ddfbbae6be97fd6cdf3e7ca13232a3afff2353e29badfab7f73011edd4ced9"));

        // Note that of those which support the service bits prefix, most only support a subset of
        // possible options.
        // This is fine at runtime as we'll fall back to using them as an addrfetch if they don't support the
        // service bits we want, but we should get them updated to support all service bits wanted by any
        // release ASAP to avoid it where possible.
        vSeeds.emplace_back("seed-a.litecoin.loshan.co.uk");
        vSeeds.emplace_back("dnsseed.thrasher.io");
        vSeeds.emplace_back("dnsseed.litecointools.com");
        vSeeds.emplace_back("dnsseed.litecoinpool.org");
        vSeeds.emplace_back("dnsseed.koin-project.com");

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,48);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,5);
        base58Prefixes[SCRIPT_ADDRESS2] = std::vector<unsigned char>(1,50);
        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,176);
        base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x88, 0xB2, 0x1E};
        base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x88, 0xAD, 0xE4};

        bech32_hrp = "ltc";
        mweb_hrp = "ltcmweb";

        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 = {
            {
                {  1500, uint256S("0x841a2965955dd288cfa707a755d05a54e45f8bd476835ec9af4402a2b59a2967")},
                {  4032, uint256S("0x9ce90e427198fc0ef05e5905ce3503725b80e26afd35a987965fd7e3d9cf0846")},
                {  8064, uint256S("0xeb984353fc5190f210651f150c40b8a4bab9eeeff0b729fcb3987da694430d70")},
                { 16128, uint256S("0x602edf1859b7f9a6af809f1d9b0e6cb66fdc1d4d9dcd7a4bec03e12a1ccd153d")},
                { 23420, uint256S("0xd80fdf9ca81afd0bd2b2a90ac3a9fe547da58f2530ec874e978fce0b5101b507")},
                { 50000, uint256S("0x69dc37eb029b68f075a5012dcc0419c127672adb4f3a32882b2b3e71d07a20a6")},
                { 80000, uint256S("0x4fcb7c02f676a300503f49c764a89955a8f920b46a8cbecb4867182ecdb2e90a")},
                {120000, uint256S("0xbd9d26924f05f6daa7f0155f32828ec89e8e29cee9e7121b026a7a3552ac6131")},
                {161500, uint256S("0xdbe89880474f4bb4f75c227c77ba1cdc024991123b28b8418dbbf7798471ff43")},
                {179620, uint256S("0x2ad9c65c990ac00426d18e446e0fd7be2ffa69e9a7dcb28358a50b2b78b9f709")},
                {240000, uint256S("0x7140d1c4b4c2157ca217ee7636f24c9c73db39c4590c4e6eab2e3ea1555088aa")},
                {383640, uint256S("0x2b6809f094a9215bafc65eb3f110a35127a34be94b7d0590a096c3f126c6f364")},
                {409004, uint256S("0x487518d663d9f1fa08611d9395ad74d982b667fbdc0e77e9cf39b4f1355908a3")},
                {456000, uint256S("0xbf34f71cc6366cd487930d06be22f897e34ca6a40501ac7d401be32456372004")},
                {638902, uint256S("0x15238656e8ec63d28de29a8c75fcf3a5819afc953dcd9cc45cecc53baec74f38")},
                {721000, uint256S("0x198a7b4de1df9478e2463bd99d75b714eab235a2e63e741641dc8a759a9840e5")},
            }
        };

        chainTxData = ChainTxData{
            // Data from rpc: getchaintxstats 4096 62e2e3d21343a00994d38a63524867507dbeee6850e8fbf02e9c47a3ccf82f24
            /* nTime    */ 1641142661,
            /* nTxCount */ 100225898,
            /* dTxRate  */ 1.17733189266096
        };
    }
};

/**
 * Testnet (v3)
 */
class CTestNetParams : public CChainParams {
public:
    CTestNetParams() {
        strNetworkID = CBaseChainParams::TESTNET;
        consensus.signet_blocks = false;
        consensus.signet_challenge.clear();
        consensus.nSubsidyHalvingInterval = 840000;
        consensus.BIP16Height = 0; // always enforce P2SH BIP16 on testnet
        consensus.BIP34Height = 76;
        consensus.BIP34Hash = uint256S("8075c771ed8b495ffd943980a95f702ab34fce3c8c54e379548bda33cc8c0573");
        consensus.BIP65Height = 76; // 8075c771ed8b495ffd943980a95f702ab34fce3c8c54e379548bda33cc8c0573
        consensus.BIP66Height = 76; // 8075c771ed8b495ffd943980a95f702ab34fce3c8c54e379548bda33cc8c0573
        consensus.CSVHeight = 6048; // 00000000025e930139bac5c6c31a403776da130831ab85be56578f3fa75369bb
        consensus.SegwitHeight = 6048; // 00000000002b980fcd729daaa248fd9316a5200e9b367f4ff2c42453e84201ca
        consensus.MinBIP9WarningHeight = 8064; // segwit activation height + miner confirmation window
        consensus.powLimit = uint256S("00000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
        consensus.nPowTargetTimespan = 3.5 * 24 * 60 * 60; // 3.5 days
        consensus.nPowTargetSpacing = 2.5 * 60;
        consensus.fPowAllowMinDifficultyBlocks = true;
        consensus.fPowNoRetargeting = false;
        consensus.nRuleChangeActivationThreshold = 1512; // 75% for testchains
        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;

        // Deployment of Taproot (BIPs 340-342)
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].bit = 2;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartHeight = 2225664; // March 2022
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeoutHeight = 2435328; // 364 days later

        // Deployment of MWEB (LIP-0002, LIP-0003, and LIP-0004)
        consensus.vDeployments[Consensus::DEPLOYMENT_MWEB].bit = 4;
        consensus.vDeployments[Consensus::DEPLOYMENT_MWEB].nStartHeight = 2209536; // Jan/Feb 2022
        consensus.vDeployments[Consensus::DEPLOYMENT_MWEB].nTimeoutHeight = 2419200; // 364 days later

        consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000000004260a1758f04aa");
        consensus.defaultAssumeValid = uint256S("0x4a280c0e150e3b74ebe19618e6394548c8a39d5549fd9941b9c431c73822fbd5"); // 1737876

        pchMessageStart[0] = 0xfd;
        pchMessageStart[1] = 0xd2;
        pchMessageStart[2] = 0xc8;
        pchMessageStart[3] = 0xf1;
        nDefaultPort = 19335;
        nPruneAfterHeight = 1000;
        m_assumed_blockchain_size = 4;
        m_assumed_chain_state_size = 1;

        genesis = CreateGenesisBlock(1486949366, 293345, 0x1e0ffff0, 1, 50 * COIN);
        consensus.hashGenesisBlock = genesis.GetHash();
        assert(consensus.hashGenesisBlock == uint256S("0x4966625a4b2851d9fdee139e56211a0d88575f59ed816ff5e6a63deb4e3e29a0"));
        assert(genesis.hashMerkleRoot == uint256S("0x97ddfbbae6be97fd6cdf3e7ca13232a3afff2353e29badfab7f73011edd4ced9"));

        vFixedSeeds.clear();
        vSeeds.clear();
        // nodes with support for servicebits filtering should be at the top
        vSeeds.emplace_back("testnet-seed.litecointools.com");
        vSeeds.emplace_back("seed-b.litecoin.loshan.co.uk");
        vSeeds.emplace_back("dnsseed-testnet.thrasher.io");

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,111);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,196);
        base58Prefixes[SCRIPT_ADDRESS2] = std::vector<unsigned char>(1,58);
        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 = "tltc";
        mweb_hrp = "tmweb";

        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 = {
            {
                {300, uint256S("54e6075affe658d6574e04c9245a7920ad94dc5af8f5b37fd9a094e317769740")},
                {2056, uint256S("17748a31ba97afdc9a4f86837a39d287e3e7c7290a08a1d816c5969c78a83289")},
                {2352616, uint256S("7540437e7bf7831fa872ba8cfae85951a1e5dbb04c201b6f5def934d9299f3c2")}
            }
        };

        chainTxData = ChainTxData{
            // Data from RPC: getchaintxstats 4096 36d8ad003bac090cf7bf4e24fbe1d319554c8933b9314188d6096ac12648764d
            /* nTime    */ 1607986972,
            /* nTxCount */ 4229067,
            /* dTxRate  */ 0.06527021772939347,
        };
    }
};

/**
 * Regression test
 */
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.BIP16Height = 0;
        consensus.BIP34Height = 500; // BIP34 activated on regtest (Used in functional tests)
        consensus.BIP34Hash = uint256();
        consensus.BIP65Height = 1351; // BIP65 activated on regtest (Used in functional tests)
        consensus.BIP66Height = 1251; // BIP66 activated on regtest (Used in functional tests)
        consensus.CSVHeight = 432; // CSV activated on regtest (Used in rpc activation tests)
        consensus.SegwitHeight = 0; // SEGWIT is always activated on regtest unless overridden
        consensus.MinBIP9WarningHeight = 0;
        consensus.powLimit = uint256S("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
        consensus.nPowTargetTimespan = 3.5 * 24 * 60 * 60; // 3.5 days
        consensus.nPowTargetSpacing = 2.5 * 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_TAPROOT].bit = 2;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartTime = Consensus::BIP9Deployment::ALWAYS_ACTIVE;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;

        // Deployment of MWEB (LIP-0002 and LIP-0003)
        consensus.vDeployments[Consensus::DEPLOYMENT_MWEB].bit = 4;
        consensus.vDeployments[Consensus::DEPLOYMENT_MWEB].nStartTime = 1601450001; // September 30, 2020
        consensus.vDeployments[Consensus::DEPLOYMENT_MWEB].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;

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

        pchMessageStart[0] = 0xfa;
        pchMessageStart[1] = 0xbf;
        pchMessageStart[2] = 0xb5;
        pchMessageStart[3] = 0xda;
        nDefaultPort = 19444;
        nPruneAfterHeight = 1000;
        m_assumed_blockchain_size = 0;
        m_assumed_chain_state_size = 0;

        UpdateActivationParametersFromArgs(args);

        genesis = CreateGenesisBlock(1296688602, 0, 0x207fffff, 1, 50 * COIN);
        consensus.hashGenesisBlock = genesis.GetHash();
        assert(consensus.hashGenesisBlock == uint256S("0x530827f38f93b43ed12af0b3ad25a288dc02ed74d6d7857862df51fc56c416f9"));
        assert(genesis.hashMerkleRoot == uint256S("0x97ddfbbae6be97fd6cdf3e7ca13232a3afff2353e29badfab7f73011edd4ced9"));

        vFixedSeeds.clear(); //!< Regtest mode doesn't have any fixed seeds.
        vSeeds.clear();      //!< Regtest mode doesn't have any DNS seeds.

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

        checkpointData = {
            {
                {0, uint256S("530827f38f93b43ed12af0b3ad25a288dc02ed74d6d7857862df51fc56c416f9")},
            }
        };

        chainTxData = ChainTxData{
            0,
            0,
            0
        };

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,111);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,196);
        base58Prefixes[SCRIPT_ADDRESS2] = std::vector<unsigned char>(1,58);
        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 = "rltc";
        mweb_hrp = "tmweb";
    }

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

void CRegTestParams::UpdateActivationParametersFromArgs(const ArgsManager& args)
{
    if (args.IsArgSet("-segwitheight")) {
        int64_t height = args.GetArg("-segwitheight", consensus.SegwitHeight);
        if (height < -1 || height >= std::numeric_limits<int>::max()) {
            throw std::runtime_error(strprintf("Activation height %ld for segwit is out of valid range. Use -1 to disable segwit.", height));
        } else if (height == -1) {
            LogPrintf("Segwit disabled for testing\n");
            height = std::numeric_limits<int>::max();
        }
        consensus.SegwitHeight = static_cast<int>(height);
    }

    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 || 5 < vDeploymentParams.size()) {
            throw std::runtime_error("Version bits parameters malformed, expecting deployment:start:end[:heightstart:heightend]");
        }
        int64_t nStartTime, nTimeout, nStartHeight, nTimeoutHeight;
        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() > 3 && !ParseInt64(vDeploymentParams[3], &nStartHeight)) {
            throw std::runtime_error(strprintf("Invalid nStartHeight (%s)", vDeploymentParams[3]));
        }
        if (vDeploymentParams.size() > 4 && !ParseInt64(vDeploymentParams[4], &nTimeoutHeight)) {
            throw std::runtime_error(strprintf("Invalid nTimeoutHeight (%s)", vDeploymentParams[4]));
        }
        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, nStartHeight, nTimeoutHeight);
                found = true;
                LogPrintf("Setting version bits activation parameters for %s to start=%ld, timeout=%ld, start_height=%d, timeout_height=%d\n", vDeploymentParams[0], nStartTime, nTimeout, nStartHeight, nTimeoutHeight);
                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 CTestNetParams()); // TODO: Support SigNet
    } 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);
}