text: // Copyright (c) 2010 Satoshi Nakamoto
  // Copyright (c) 2009-2018 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 <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 = "main";
          consensus.nSubsidyHalvingInterval = 840000;
          consensus.BIP16Height = 218579; // 87afb798a3ad9378fcd56123c81fb31cfd9a8df4719b9774d71730c16315a092 - October 1, 2012
          consensus.BIP34Height = 710000;
          consensus.BIP34Hash = uint256S("fa09d204a83a768ed5a7c8d441fa62f2043abf420cff1226c7b4329aeb9d51cf");
          consensus.BIP65Height = 918684; // bab3041e8977e0dc3eeff63fe707b92bde1dd449d8efafb248c27c8264cc311a
          consensus.BIP66Height = 811879; // 7aceee012833fa8952f8835d8b1b3ae233cd6ab08fdb27a771d2bd7bdc491894
          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 = 1199145601; // January 1, 2008
          consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008
  
          // Deployment of BIP68, BIP112, and BIP113.
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].bit = 0;
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 1485561600; // January 28, 2017
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1517356801; // January 31st, 2018
  
          // Deployment of SegWit (BIP141, BIP143, and BIP147)
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1485561600; // January 28, 2017
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1517356801; // January 31st, 2018
  
          // The best chain should have at least this much work.
          consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000002ee655bf00bf13b4cca");
  
          // By default assume that the signatures in ancestors of this block are valid.
          consensus.defaultAssumeValid = uint256S("0xb34a457c601ef8ce3294116e3296078797be7ded1b0d12515395db9ab5e93ab8"); //1683528
  
          /**
           * 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 = 22;
          m_assumed_chain_state_size = 3;
  
          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 a oneshot 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");
  
          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";
  
          vFixedSeeds = std::vector<SeedSpec6>(pnSeed6_main, pnSeed6_main + ARRAYLEN(pnSeed6_main));
  
          fDefaultConsistencyChecks = false;
          fRequireStandard = true;
          fMineBlocksOnDemand = 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 2cdba8c47858d34cf0e02dfb8733263a3ed8705b1663ec7c158783d77b93e7ee
              /* nTime    */ 1565379143,
              /* nTxCount */ 36299075,
              /* dTxRate  */ 0.388813310286546
          };
  
          /* disable fallback fee on mainnet */
          m_fallback_fee_enabled = false;
      }
  };
  
  /**
   * Testnet (v3)
   */
  class CTestNetParams : public CChainParams {
  public:
      CTestNetParams() {
          strNetworkID = "test";
          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.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 = 1199145601; // January 1, 2008
          consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008
  
          // Deployment of BIP68, BIP112, and BIP113.
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].bit = 0;
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 1483228800; // January 1, 2017
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1517356801; // January 31st, 2018
  
          // Deployment of SegWit (BIP141, BIP143, and BIP147)
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1483228800; // January 1, 2017
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1517356801; // January 31st, 2018
  
          // The best chain should have at least this much work.
          consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000000035ed7ece35dc93");
  
          // By default assume that the signatures in ancestors of this block are valid.
          consensus.defaultAssumeValid = uint256S("0xf19dfbdc0e6c399ef45d315d89fc3e972dd8da74503252bacaf664f64d86e6f6"); //1174621
  
          pchMessageStart[0] = 0xfd;
          pchMessageStart[1] = 0xd2;
          pchMessageStart[2] = 0xc8;
          pchMessageStart[3] = 0xf1;
          nDefaultPort = 19335;
          nPruneAfterHeight = 1000;
          m_assumed_blockchain_size = 2;
          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";
  
          vFixedSeeds = std::vector<SeedSpec6>(pnSeed6_test, pnSeed6_test + ARRAYLEN(pnSeed6_test));
  
          fDefaultConsistencyChecks = false;
          fRequireStandard = false;
          fMineBlocksOnDemand = false;
  
          checkpointData = {
              {
                  {2056, uint256S("17748a31ba97afdc9a4f86837a39d287e3e7c7290a08a1d816c5969c78a83289")},
              }
          };
  
          chainTxData = ChainTxData{
              // Data from rpc: getchaintxstats 4096 e79561972208ba3a02c308482176b33f3ec841d4213ea7bbaa3f22b7c8a16f32
              /* nTime    */ 1565582448,
              /* nTxCount */ 2848910,
              /* dTxRate  */ 0.02265200874042768
          };
  
          /* enable fallback fee on testnet */
          m_fallback_fee_enabled = true;
      }
  };
  
  /**
   * Regression test
   */
  class CRegTestParams : public CChainParams {
  public:
      explicit CRegTestParams(const ArgsManager& args) {
          strNetworkID = "regtest";
          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.powLimit = uint256S("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
          consensus.nPowTargetTimespan = 3.5 * 24 * 60 * 60; // two weeks
          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_CSV].bit = 0;
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 0;
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = Consensus::BIP9Deployment::ALWAYS_ACTIVE;
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
  
          // The best chain should have at least this much work.
          consensus.nMinimumChainWork = uint256S("0x00");
  
          // By default assume that the signatures in ancestors of this block are valid.
          consensus.defaultAssumeValid = uint256S("0x00");
  
          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;
  
          UpdateVersionBitsParametersFromArgs(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 = false;
          fMineBlocksOnDemand = 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";
  
          /* enable fallback fee on regtest */
          m_fallback_fee_enabled = true;
      }
  
      /**
       * 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 UpdateVersionBitsParametersFromArgs(const ArgsManager& args);
  };
  
  void CRegTestParams::UpdateVersionBitsParametersFromArgs(const ArgsManager& args)
  {
      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 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::REGTEST)
          return std::unique_ptr<CChainParams>(new CRegTestParams(gArgs));
      throw std::runtime_error(strprintf("%s: Unknown chain %s.", __func__, chain));
  }
  
  void SelectParams(const std::string& network)
  {
      SelectBaseParams(network);
      globalChainParams = CreateChainParams(network);
  }
  