text: // 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 = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
      const CScript genesisOutputScript = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << 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 = 210000;
          consensus.BIP16Exception = uint256S("0x00000000000002dc756eebf4f49723ed8d30cc28a5f108eb94b1ba88ac4f9c22");
          consensus.BIP34Height = 227931;
          consensus.BIP34Hash = uint256S("0x000000000000024b89b42a942fe0d9fea3bb44ab7bd1b19115dd6a759c0808b8");
          consensus.BIP65Height = 388381; // 000000000000000004c2b624ed5d7756c508d90fd0da2c7c679febfa6c4735f0
          consensus.BIP66Height = 363725; // 00000000000000000379eaa19dce8c9b722d46ae6a57c2f1a988119488b50931
          consensus.CSVHeight = 419328; // 000000000000000004a1b34462cb8aeebd5799177f7a29cf28f2d1961716b5b5
          consensus.SegwitHeight = 481824; // 0000000000000000001c8018d9cb3b742ef25114f27563e3fc4a1902167f9893
          consensus.MinBIP9WarningHeight = 483840; // segwit activation height + miner confirmation window
          consensus.powLimit = uint256S("00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
          consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
          consensus.nPowTargetSpacing = 10 * 60;
          consensus.fPowAllowMinDifficultyBlocks = false;
          consensus.fPowNoRetargeting = false;
          consensus.nRuleChangeActivationThreshold = 1916; // 95% of 2016
          consensus.nMinerConfirmationWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
          consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
          consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 1199145601; // January 1, 2008
          consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008
  
          // Deployment of Taproot (BIPs 340-342)
          consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].bit = 2;
          consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartTime = 1199145601; // January 1, 2008
          consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = 1230767999; // December 31, 2008
  
          consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000e1ab5ec9348e9f4b8eb8154");
          consensus.defaultAssumeValid = uint256S("0x0000000000000000000f2adce67e49b0b6bdeb9de8b7c3d7e93b21e7fc1e819d"); // 623950
  
          /**
           * 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] = 0xf9;
          pchMessageStart[1] = 0xbe;
          pchMessageStart[2] = 0xb4;
          pchMessageStart[3] = 0xd9;
          nDefaultPort = 8333;
          nPruneAfterHeight = 100000;
          m_assumed_blockchain_size = 320;
          m_assumed_chain_state_size = 4;
  
          genesis = CreateGenesisBlock(1231006505, 2083236893, 0x1d00ffff, 1, 50 * COIN);
          consensus.hashGenesisBlock = genesis.GetHash();
          assert(consensus.hashGenesisBlock == uint256S("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"));
          assert(genesis.hashMerkleRoot == uint256S("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
  
          // 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.bitcoin.sipa.be"); // Pieter Wuille, only supports x1, x5, x9, and xd
          vSeeds.emplace_back("dnsseed.bluematt.me"); // Matt Corallo, only supports x9
          vSeeds.emplace_back("dnsseed.bitcoin.dashjr.org"); // Luke Dashjr
          vSeeds.emplace_back("seed.bitcoinstats.com"); // Christian Decker, supports x1 - xf
          vSeeds.emplace_back("seed.bitcoin.jonasschnelli.ch"); // Jonas Schnelli, only supports x1, x5, x9, and xd
          vSeeds.emplace_back("seed.btc.petertodd.org"); // Peter Todd, only supports x1, x5, x9, and xd
          vSeeds.emplace_back("seed.bitcoin.sprovoost.nl"); // Sjors Provoost
          vSeeds.emplace_back("dnsseed.emzy.de"); // Stephan Oeste
          vSeeds.emplace_back("seed.bitcoin.wiz.biz"); // Jason Maurice
  
          base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,0);
          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 = "bc";
  
          vFixedSeeds = std::vector<SeedSpec6>(pnSeed6_main, pnSeed6_main + ARRAYLEN(pnSeed6_main));
  
          fDefaultConsistencyChecks = false;
          fRequireStandard = true;
          m_is_test_chain = false;
          m_is_mockable_chain = false;
  
          checkpointData = {
              {
                  { 11111, uint256S("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d")},
                  { 33333, uint256S("0x000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6")},
                  { 74000, uint256S("0x0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20")},
                  {105000, uint256S("0x00000000000291ce28027faea320c8d2b054b2e0fe44a773f3eefb151d6bdc97")},
                  {134444, uint256S("0x00000000000005b12ffd4cd315cd34ffd4a594f430ac814c91184a0d42d2b0fe")},
                  {168000, uint256S("0x000000000000099e61ea72015e79632f216fe6cb33d7899acb35b75c8303b763")},
                  {193000, uint256S("0x000000000000059f452a5f7340de6682a977387c17010ff6e6c3bd83ca8b1317")},
                  {210000, uint256S("0x000000000000048b95347e83192f69cf0366076336c639f9b7228e9ba171342e")},
                  {216116, uint256S("0x00000000000001b4f4b433e81ee46494af945cf96014816a4e2370f11b23df4e")},
                  {225430, uint256S("0x00000000000001c108384350f74090433e7fcf79a606b8e797f065b130575932")},
                  {250000, uint256S("0x000000000000003887df1f29024b06fc2200b55f8af8f35453d7be294df2d214")},
                  {279000, uint256S("0x0000000000000001ae8c72a0b0c301f67e3afca10e819efa9041e458e9bd7e40")},
                  {295000, uint256S("0x00000000000000004d9b4ef50f0f9d686fd69db2e03af35a100370c64632a983")},
              }
          };
  
          chainTxData = ChainTxData{
              // Data from RPC: getchaintxstats 4096 0000000000000000000f2adce67e49b0b6bdeb9de8b7c3d7e93b21e7fc1e819d
              /* nTime    */ 1585764811,
              /* nTxCount */ 517186863,
              /* dTxRate  */ 3.305709665792344,
          };
      }
  };
  
  /**
   * Testnet (v3)
   */
  class CTestNetParams : public CChainParams {
  public:
      CTestNetParams() {
          strNetworkID = CBaseChainParams::TESTNET;
          consensus.signet_blocks = false;
          consensus.signet_challenge.clear();
          consensus.nSubsidyHalvingInterval = 210000;
          consensus.BIP16Exception = uint256S("0x00000000dd30457c001f4095d208cc1296b0eed002427aa599874af7a432b105");
          consensus.BIP34Height = 21111;
          consensus.BIP34Hash = uint256S("0x0000000023b3a96d3484e5abb3755c413e7d41500f8e2a5c3f0dd01299cd8ef8");
          consensus.BIP65Height = 581885; // 00000000007f6655f22f98e72ed80d8b06dc761d5da09df0fa1dc4be4f861eb6
          consensus.BIP66Height = 330776; // 000000002104c8c45e99a8853285a3b592602a3ccde2b832481da85e9e4ba182
          consensus.CSVHeight = 770112; // 00000000025e930139bac5c6c31a403776da130831ab85be56578f3fa75369bb
          consensus.SegwitHeight = 834624; // 00000000002b980fcd729daaa248fd9316a5200e9b367f4ff2c42453e84201ca
          consensus.MinBIP9WarningHeight = 836640; // segwit activation height + miner confirmation window
          consensus.powLimit = uint256S("00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
          consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
          consensus.nPowTargetSpacing = 10 * 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 = 1199145601; // January 1, 2008
          consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008
  
          // Deployment of Taproot (BIPs 340-342)
          consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].bit = 2;
          consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartTime = 1199145601; // January 1, 2008
          consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = 1230767999; // December 31, 2008
  
          consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000001495c1d5a01e2af8a23");
          consensus.defaultAssumeValid = uint256S("0x000000000000056c49030c174179b52a928c870e6e8a822c75973b7970cfbd01"); // 1692000
  
          pchMessageStart[0] = 0x0b;
          pchMessageStart[1] = 0x11;
          pchMessageStart[2] = 0x09;
          pchMessageStart[3] = 0x07;
          nDefaultPort = 18333;
          nPruneAfterHeight = 1000;
          m_assumed_blockchain_size = 40;
          m_assumed_chain_state_size = 2;
  
          genesis = CreateGenesisBlock(1296688602, 414098458, 0x1d00ffff, 1, 50 * COIN);
          consensus.hashGenesisBlock = genesis.GetHash();
          assert(consensus.hashGenesisBlock == uint256S("0x000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943"));
          assert(genesis.hashMerkleRoot == uint256S("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
  
          vFixedSeeds.clear();
          vSeeds.clear();
          // nodes with support for servicebits filtering should be at the top
          vSeeds.emplace_back("testnet-seed.bitcoin.jonasschnelli.ch");
          vSeeds.emplace_back("seed.tbtc.petertodd.org");
          vSeeds.emplace_back("seed.testnet.bitcoin.sprovoost.nl");
          vSeeds.emplace_back("testnet-seed.bluematt.me"); // Just a static list of stable node(s), only supports x9
  
          base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,111);
          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 = "tb";
  
          vFixedSeeds = std::vector<SeedSpec6>(pnSeed6_test, pnSeed6_test + ARRAYLEN(pnSeed6_test));
  
          fDefaultConsistencyChecks = false;
          fRequireStandard = false;
          m_is_test_chain = true;
          m_is_mockable_chain = false;
  
          checkpointData = {
              {
                  {546, uint256S("000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70")},
              }
          };
  
          chainTxData = ChainTxData{
              // Data from RPC: getchaintxstats 4096 000000000000056c49030c174179b52a928c870e6e8a822c75973b7970cfbd01
              /* nTime    */ 1585561140,
              /* nTxCount */ 13483,
              /* dTxRate  */ 0.08523187013249722,
          };
      }
  };
  
  /**
   * Signet
   */
  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("ntv3mtqw5wt63red.onion:38333");
  
              consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000000000000d145533ce");
              consensus.defaultAssumeValid = uint256S("0x00000128807d9175c494e24d805fc7854f7d79aa965cbb128342ad8b70cecfa5"); // 5348
              m_assumed_blockchain_size = 1;
              m_assumed_chain_state_size = 0;
              chainTxData = ChainTxData{
                  // Data from RPC: getchaintxstats 4096 00000128807d9175c494e24d805fc7854f7d79aa965cbb128342ad8b70cecfa5
                  /* nTime    */ 1601382000,
                  /* nTxCount */ 5435,
                  /* dTxRate  */ 0.001898346323372538,
              };
          } 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 = 1916;
          consensus.nMinerConfirmationWindow = 2016;
          consensus.MinBIP9WarningHeight = 0;
          consensus.powLimit = uint256S("00000377ae000000000000000000000000000000000000000000000000000000");
          consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
          consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 1199145601; // January 1, 2008
          consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008
  
          // 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;
  
          // 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("0x00000008819873e925422c1ff0f99f7cc9bbb232af63a077a480a3633bee1ef6"));
          assert(genesis.hashMerkleRoot == uint256S("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
  
          vFixedSeeds.clear();
  
          base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,111);
          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 = "tb";
  
          fDefaultConsistencyChecks = false;
          fRequireStandard = true;
          m_is_test_chain = true;
          m_is_mockable_chain = false;
      }
  };
  
  /**
   * 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.BIP16Exception = uint256();
          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 = 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_TAPROOT].bit = 2;
          consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartTime = Consensus::BIP9Deployment::ALWAYS_ACTIVE;
          consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
  
          consensus.nMinimumChainWork = uint256{};
          consensus.defaultAssumeValid = uint256{};
  
          pchMessageStart[0] = 0xfa;
          pchMessageStart[1] = 0xbf;
          pchMessageStart[2] = 0xb5;
          pchMessageStart[3] = 0xda;
          nDefaultPort = 18444;
          nPruneAfterHeight = 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("0x0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206"));
          assert(genesis.hashMerkleRoot == uint256S("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
  
          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("0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206")},
              }
          };
  
          chainTxData = ChainTxData{
              0,
              0,
              0
          };
  
          base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,111);
          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 = "bcrt";
      }
  
      /**
       * Allows modifying the Version Bits regtest parameters.
       */
      void UpdateVersionBitsParameters(Consensus::DeploymentPos d, int64_t nStartTime, int64_t nTimeout)
      {
          consensus.vDeployments[d].nStartTime = nStartTime;
          consensus.vDeployments[d].nTimeout = nTimeout;
      }
      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) {
              throw std::runtime_error("Version bits parameters malformed, expecting deployment:start:end");
          }
          int64_t nStartTime, nTimeout;
          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]));
          }
          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);
                  found = true;
                  LogPrintf("Setting version bits activation parameters for %s to start=%ld, timeout=%ld\n", vDeploymentParams[0], nStartTime, nTimeout);
                  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);
  }
  