src/checkpoints.cpp

   1 // Copyright (c) 2009-2012 The Bitcoin developers
   2 // Distributed under the MIT/X11 software license, see the accompanying
   3 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include <boost/assign/list_of.hpp> // for 'map_list_of()'
   6 #include <boost/foreach.hpp>
   7
   8 #include "headers.h"
   9 #include "checkpoints.h"
  10
  11 namespace Checkpoints
  12 {
  13     typedef std::map<int, uint256> MapCheckpoints;
  14
  15     //
  16     // What makes a good checkpoint block?
  17     // + Is surrounded by blocks with reasonable timestamps
  18     //   (no blocks before with a timestamp after, none after with
  19     //    timestamp before)
  20     // + Contains no strange transactions
  21     //
  22     static MapCheckpoints mapCheckpoints =
  23         boost::assign::map_list_of
  24         ( 11111, uint256("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d"))
  25         ( 33333, uint256("0x000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6"))
  26         ( 68555, uint256("0x00000000001e1b4903550a0b96e9a9405c8a95f387162e4944e8d9fbe501cd6a"))
  27         ( 70567, uint256("0x00000000006a49b14bcf27462068f1264c961f11fa2e0eddd2be0791e1d4124a"))
  28         ( 74000, uint256("0x0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20"))
  29         (105000, uint256("0x00000000000291ce28027faea320c8d2b054b2e0fe44a773f3eefb151d6bdc97"))
  30         (118000, uint256("0x000000000000774a7f8a7a12dc906ddb9e17e75d684f15e00f8767f9e8f36553"))
  31         (134444, uint256("0x00000000000005b12ffd4cd315cd34ffd4a594f430ac814c91184a0d42d2b0fe"))
  32         (140700, uint256("0x000000000000033b512028abb90e1626d8b346fd0ed598ac0a3c371138dce2bd"))
  33         (168000, uint256("0x000000000000099e61ea72015e79632f216fe6cb33d7899acb35b75c8303b763"))
  34         ;
  35
  36     bool CheckBlock(int nHeight, const uint256& hash)
  37     {
  38         if (fTestNet) return true; // Testnet has no checkpoints
  39
  40         MapCheckpoints::const_iterator i = mapCheckpoints.find(nHeight);
  41         if (i == mapCheckpoints.end()) return true;
  42         return hash == i->second;
  43     }
  44
  45     int GetTotalBlocksEstimate()
  46     {
  47         if (fTestNet) return 0;
  48
  49         return mapCheckpoints.rbegin()->first;
  50     }
  51
  52     CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex)
  53     {
  54         if (fTestNet) return NULL;
  55
  56         BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, mapCheckpoints)
  57         {
  58             const uint256& hash = i.second;
  59             std::map<uint256, CBlockIndex*>::const_iterator t = mapBlockIndex.find(hash);
  60             if (t != mapBlockIndex.end())
  61                 return t->second;
  62         }
  63         return NULL;
  64     }
  65 }