text: // Copyright (c) 2009-2012 The Bitcoin developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <boost/assign/list_of.hpp> // for 'map_list_of()'
  #include <boost/foreach.hpp>
  
  #include "checkpoints.h"
  
  #include "main.h"
  #include "uint256.h"
  
  namespace Checkpoints
  {
      typedef std::map<int, uint256> MapCheckpoints;
  
      //
      // 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
      //
      static MapCheckpoints mapCheckpoints =
          boost::assign::map_list_of
          ( 11111, uint256("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d"))
          ( 33333, uint256("0x000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6"))
          ( 74000, uint256("0x0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20"))
          (105000, uint256("0x00000000000291ce28027faea320c8d2b054b2e0fe44a773f3eefb151d6bdc97"))
          (134444, uint256("0x00000000000005b12ffd4cd315cd34ffd4a594f430ac814c91184a0d42d2b0fe"))
          (168000, uint256("0x000000000000099e61ea72015e79632f216fe6cb33d7899acb35b75c8303b763"))
          (185333, uint256("0x00000000000002334c71b8706940c20348af897a9cfc0f1a6dab0d14d4ceb815"))
          ;
  
      static MapCheckpoints mapCheckpointsTestnet =
          boost::assign::map_list_of
          ( 546, uint256("000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70"))
          ;
  
      bool CheckBlock(int nHeight, const uint256& hash)
      {
          MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
  
          MapCheckpoints::const_iterator i = checkpoints.find(nHeight);
          if (i == checkpoints.end()) return true;
          return hash == i->second;
      }
  
      int GetTotalBlocksEstimate()
      {
          MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
  
          return checkpoints.rbegin()->first;
      }
  
      CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex)
      {
          MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
  
          BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, checkpoints)
          {
              const uint256& hash = i.second;
              std::map<uint256, CBlockIndex*>::const_iterator t = mapBlockIndex.find(hash);
              if (t != mapBlockIndex.end())
                  return t->second;
          }
          return NULL;
      }
  }
  