text: // Copyright (c) 2010 Satoshi Nakamoto
  // Copyright (c) 2009-2015 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 "consensus/merkle.h"
  
  #include "tinyformat.h"
  #include "util.h"
  #include "utilstrencodings.h"
  
  #include <assert.h>
  
  #include "chainparamsseeds.h"
  
  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 = "Congress Questions The SEC On Libra, Cryptocurrency And The Whole Blockchain Phenomenon";
      const CScript genesisOutputScript = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
      return CreateGenesisBlock(pszTimestamp, genesisOutputScript, nTime, nNonce, nBits, nVersion, genesisReward);
  }
  
  void CChainParams::UpdateVersionBitsParameters(Consensus::DeploymentPos d, int64_t nStartTime, int64_t nTimeout)
  {
      consensus.vDeployments[d].nStartTime = nStartTime;
      consensus.vDeployments[d].nTimeout = nTimeout;
  }
  
  /**
   * Main network
   */
  /**
   * What makes a good checkpoint block?
   * + Is surrounded by blocks with reasonable timestamps
   *   (no blocks before with a timestamp after, none after with
   *    timestamp before)
   * + Contains no strange transactions
   */
  
  class CMainParams : public CChainParams {
  public:
      CMainParams() {
          strNetworkID = "main";
          consensus.nSubsidyHalvingInterval = 840000;
          consensus.BIP34Height = 0;
          consensus.BIP34Hash = uint256S("8f57c052ba301d9aea97551a0669df566d8c220da15e602983847c4815167cbf");
          consensus.BIP65Height = 0; // 0x8f57c052ba301d9aea97551a0669df566d8c220da15e602983847c4815167cbf
          consensus.BIP66Height = 0; // 0x8f57c052ba301d9aea97551a0669df566d8c220da15e602983847c4815167cbf
          consensus.powLimit = uint256S("000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"); 
          consensus.nPowTargetTimespan = 1 * 24 * 60 * 60; // 1 day
          consensus.nPowTargetSpacing = 1 * 60;
          consensus.fPowAllowMinDifficultyBlocks = true;
          consensus.fPowNoRetargeting = false;
          consensus.nRuleChangeActivationThreshold = 4320; // 75% of 5760
          consensus.nMinerConfirmationWindow = 5760; // 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 = 1569707640; // GMT: Saturday, September 28, 2019 9:54:00 PM
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1601330040; // GMT:  Monday, September 28, 2020 9:54:00 PM
  
          // Deployment of SegWit (BIP141, BIP143, and BIP147)
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1569707640; // GMT: Saturday, September 28, 2019 9:54:00 PM
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1601330040; // GMT:  Monday, September 28, 2020 9:54:00 PM
  
          // 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("0x8f57c052ba301d9aea97551a0669df566d8c220da15e602983847c4815167cbf"); //1353397
  
          /**
           * 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] = 0x42; // B
          pchMessageStart[1] = 0x41; // A
          pchMessageStart[2] = 0x43; // C
          pchMessageStart[3] = 0x4b; // K
          nDefaultPort = 5252;
          nPruneAfterHeight = 100000;
  
          genesis = CreateGenesisBlock(1569707640, 1326073, 0x1e0ffff0, 1, 50 * COIN);
          consensus.hashGenesisBlock = genesis.GetHash();
          assert(consensus.hashGenesisBlock == uint256S("0x8f57c052ba301d9aea97551a0669df566d8c220da15e602983847c4815167cbf"));
          assert(genesis.hashMerkleRoot == uint256S("0x4e270e74401ea02979df2b12c22848805efe60dfb889a23771ff16e0161c34e0"));
  
          // Note that of those with the service bits flag, most only support a subset of possible options
          vSeeds.emplace_back("134.209.177.212", true);
          vSeeds.emplace_back("157.245.200.239", true);
          vSeeds.emplace_back("68.183.200.208", true);
          vSeeds.emplace_back("167.71.8.90", true);        
  
          base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,25);
          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>(1,186);
          base58Prefixes[EXT_PUBLIC_KEY] = {0x05, 0x87, 0xB3, 0x1D};
          base58Prefixes[EXT_SECRET_KEY] = {0x05, 0x87, 0xAE, 0xE3};
  
          vFixedSeeds = std::vector<SeedSpec6>(pnSeed6_main, pnSeed6_main + ARRAYLEN(pnSeed6_main));
  
          fDefaultConsistencyChecks = false;
          fRequireStandard = true;
          fMineBlocksOnDemand = false;
  
          checkpointData = (CCheckpointData) {
              {
                  {  0, uint256S("0x8f57c052ba301d9aea97551a0669df566d8c220da15e602983847c4815167cbf")}, 
              }
          };
  
          chainTxData = ChainTxData{
              // Data as of block 59c9b9d3fec105bdc716d84caa7579503d5b05b73618d0bf2d5fa639f780a011 (height 1353397).
              1569707640, // * UNIX timestamp of last known number of transactions
              1,  // * total number of transactions between genesis and that timestamp
                      //   (the tx=... number in the SetBestChain debug.log lines)
              0.05     // * estimated number of transactions per second after that timestamp
          };
      }
  };
  
  /**
   * Testnet (v3)
   */
  class CTestNetParams : public CChainParams {
  public:
      CTestNetParams() {
          strNetworkID = "test";
          consensus.nSubsidyHalvingInterval = 840000;
          consensus.BIP34Height = 0;
          consensus.BIP34Hash = uint256S("5886f5675cbbf29b2bf24f5d9b6fac547972fb6d6c2b380670d85a5f9ebc4e3e");
          consensus.BIP65Height = 0; // 5886f5675cbbf29b2bf24f5d9b6fac547972fb6d6c2b380670d85a5f9ebc4e3e
          consensus.BIP66Height = 0; // 5886f5675cbbf29b2bf24f5d9b6fac547972fb6d6c2b380670d85a5f9ebc4e3e
          consensus.powLimit = uint256S("0000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
          consensus.nPowTargetTimespan = 1 * 24 * 60 * 60; // 3.5 days
          consensus.nPowTargetSpacing = 1 * 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 = 1569711240; // GMT: Saturday, September 28, 2019 10:54:00 PM
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1517356801; //   GMT: Monday,   September 28, 2020 10:54:00 PM
  
          // Deployment of SegWit (BIP141, BIP143, and BIP147)
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1569711240; // GMT: Saturday, September 28, 2019 10:54:00 PM
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1517356801; //   GMT: Monday,   September 28, 2020 10:54:00 PM
  
          // 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("0x5886f5675cbbf29b2bf24f5d9b6fac547972fb6d6c2b380670d85a5f9ebc4e3e"); //343833
  
          pchMessageStart[0] = 0x62; // b
          pchMessageStart[1] = 0x61; // a
          pchMessageStart[2] = 0x63; // c
          pchMessageStart[3] = 0x6b; // k
          nDefaultPort = 5353;
          nPruneAfterHeight = 1000;
  
          genesis = CreateGenesisBlock(1569711240, 764868, 0x1e0ffff0, 1, 50 * COIN);
          consensus.hashGenesisBlock = genesis.GetHash();
          assert(consensus.hashGenesisBlock == uint256S("0x5886f5675cbbf29b2bf24f5d9b6fac547972fb6d6c2b380670d85a5f9ebc4e3e"));
          assert(genesis.hashMerkleRoot == uint256S("0x4e270e74401ea02979df2b12c22848805efe60dfb889a23771ff16e0161c34e0"));
  
          vFixedSeeds.clear();
          vSeeds.clear();
          // nodes with support for servicebits filtering should be at the top
          vSeeds.emplace_back("testnet-seed.backpackercointools.com", true);
          vSeeds.emplace_back("seed-b.backpackercoin.loshan.co.uk", true);
          vSeeds.emplace_back("dnsseed-testnet.thrasher.io", true);
  
          base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,85);
          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] = {0x05, 0x34, 0x88, 0xCD};
          base58Prefixes[EXT_SECRET_KEY] = {0x05, 0x34, 0x84, 0x93};
  
          vFixedSeeds = std::vector<SeedSpec6>(pnSeed6_test, pnSeed6_test + ARRAYLEN(pnSeed6_test));
  
          fDefaultConsistencyChecks = false;
          fRequireStandard = false;
          fMineBlocksOnDemand = false;
  
          checkpointData = (CCheckpointData) {
              {
                  {0, uint256S("0x5886f5675cbbf29b2bf24f5d9b6fac547972fb6d6c2b380670d85a5f9ebc4e3e")},
              }
          };
  
          chainTxData = ChainTxData{
              // Data as of block a0afbded94d4be233e191525dc2d467af5c7eab3143c852c3cd549831022aad6 (height 343833)
              1569711240,
              1,
              0.09
          };
  
      }
  };
  
  /**
   * Regression test
   */
  class CRegTestParams : public CChainParams {
  public:
      CRegTestParams() {
          strNetworkID = "regtest";
          consensus.nSubsidyHalvingInterval = 150;
          consensus.BIP34Height = 100000000; // BIP34 has not activated on regtest (far in the future so block v1 are not rejected in tests)
          consensus.BIP34Hash = uint256();
          consensus.BIP65Height = 1351; // BIP65 activated on regtest (Used in rpc activation tests)
          consensus.BIP66Height = 1251; // BIP66 activated on regtest (Used in rpc activation 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 = 999999999999ULL;
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].bit = 0;
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 0;
          consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 999999999999ULL;
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 0;
          consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 999999999999ULL;
  
          // 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] = 0x74; // t
          pchMessageStart[1] = 0x65; // e
          pchMessageStart[2] = 0x73; // s
          pchMessageStart[3] = 0x74; // t
          nDefaultPort = 5454;
          nPruneAfterHeight = 1000;
  
          genesis = CreateGenesisBlock(1569714840, 4, 0x207fffff, 1, 50 * COIN);
          consensus.hashGenesisBlock = genesis.GetHash();
          assert(consensus.hashGenesisBlock == uint256S("0xd031de22fd578f5e3887675e66ef41046c1d1244f7f432179c990805117d4a8c"));
          assert(genesis.hashMerkleRoot == uint256S("0x4e270e74401ea02979df2b12c22848805efe60dfb889a23771ff16e0161c34e0"));
  
          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 = (CCheckpointData) {
              {
                  {0, uint256S("0xd031de22fd578f5e3887675e66ef41046c1d1244f7f432179c990805117d4a8c")},
              }
          };
  
          chainTxData = ChainTxData{
              0,
              0,
              0
          };
  
          base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,23);
          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] = {0x08, 0x40, 0x85, 0xCD};
          base58Prefixes[EXT_SECRET_KEY] = {0x08, 0x40, 0x81, 0x95};
      }
  };
  
  static std::unique_ptr<CChainParams> globalChainParams;
  
  const CChainParams &Params() {
      assert(globalChainParams);
      return *globalChainParams;
  }
  
  std::unique_ptr<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());
      throw std::runtime_error(strprintf("%s: Unknown chain %s.", __func__, chain));
  }
  
  void SelectParams(const std::string& network)
  {
      SelectBaseParams(network);
      globalChainParams = CreateChainParams(network);
  }
  
  void UpdateVersionBitsParameters(Consensus::DeploymentPos d, int64_t nStartTime, int64_t nTimeout)
  {
      globalChainParams->UpdateVersionBitsParameters(d, nStartTime, nTimeout);
  }
  