message: [Net] Update Checkpoints
  Add three additional hardened checkpoints.
  791150: Block occured right around the time of the v2.3.0 mandatory
  update deadline.
  795000: Incremental checkpoint.
  799000: Incremental checkpoint.
diff: @@ -52,14 +52,18 @@ static void convertSeed6(std::vector<CAddress>& vSeedsOut, const SeedSpec6* data
  // timestamp before)
  // + Contains no strange transactions
  static Checkpoints::MapCheckpoints mapCheckpoints =
  - boost::assign::map_list_of(259201, uint256("1c9121bf9329a6234bfd1ea2d91515f19cd96990725265253f4b164283ade5dd"))
  + boost::assign::map_list_of
  + (259201, uint256("1c9121bf9329a6234bfd1ea2d91515f19cd96990725265253f4b164283ade5dd"))
  (424998, uint256("f31e381eedb0ed3ed65fcc98cc71f36012bee32e8efd017c4f9fb0620fd35f6b"))
  (616764, uint256("29dd0bd1c59484f290896687b4ffb6a49afa5c498caf61967c69a541f8191557")) //first block to use modifierV2
  - (623933, uint256("c7aafa648a0f1450157dc93bd4d7448913a85b7448f803b4ab970d91fc2a7da7"));
  + (623933, uint256("c7aafa648a0f1450157dc93bd4d7448913a85b7448f803b4ab970d91fc2a7da7"))
  + (791150, uint256("8e76f462e4e82d1bd21cb72e1ce1567d4ddda2390f26074ffd1f5d9c270e5e50"))
  + (795000, uint256("4423cceeb9fd574137a18733416275a70fdf95283cc79ad976ca399aa424a443"))
  + (799000, uint256("91dfe065e700b4faad7df95998a9352b93ce645ffbb65e9841c7c744583c3b40"));
  static const Checkpoints::CCheckpointData data = {
  &mapCheckpoints,
  - 1493667067, // * UNIX timestamp of last checkpoint block
  - 1157185, // * total number of transactions between genesis and last checkpoint
  + 1504290445, // * UNIX timestamp of last checkpoint block
  + 1568221, // * total number of transactions between genesis and last checkpoint
  // (the tx=... number in the SetBestChain debug.log lines)
  2000 // * estimated number of transactions per day after checkpoint
  };
  