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0001 // Copyright (c) 2009-2012 The Bitcoin developers
0002 // Distributed under the MIT/X11 software license, see the accompanying
0003 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
0004 
0005 #include <boost/assign/list_of.hpp> // for 'map_list_of()'
0006 #include <boost/foreach.hpp>
0007 
0008 #include "headers.h"
0009 #include "checkpoints.h"
0010 
0011 namespace Checkpoints
0012 {
0013     typedef std::map<int, uint256> MapCheckpoints;
0014 
0015     //
0016     // What makes a good checkpoint block?
0017     // + Is surrounded by blocks with reasonable timestamps
0018     //   (no blocks before with a timestamp after, none after with
0019     //    timestamp before)
0020     // + Contains no strange transactions
0021     //
0022     static MapCheckpoints mapCheckpoints =
0023         boost::assign::map_list_of
0024         ( 11111, uint256("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d"))
0025         ( 33333, uint256("0x000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6"))
0026         ( 68555, uint256("0x00000000001e1b4903550a0b96e9a9405c8a95f387162e4944e8d9fbe501cd6a"))
0027         ( 70567, uint256("0x00000000006a49b14bcf27462068f1264c961f11fa2e0eddd2be0791e1d4124a"))
0028         ( 74000, uint256("0x0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20"))
0029         (105000, uint256("0x00000000000291ce28027faea320c8d2b054b2e0fe44a773f3eefb151d6bdc97"))
0030         (118000, uint256("0x000000000000774a7f8a7a12dc906ddb9e17e75d684f15e00f8767f9e8f36553"))
0031         (134444, uint256("0x00000000000005b12ffd4cd315cd34ffd4a594f430ac814c91184a0d42d2b0fe"))
0032         (140700, uint256("0x000000000000033b512028abb90e1626d8b346fd0ed598ac0a3c371138dce2bd"))
0033         (168000, uint256("0x000000000000099e61ea72015e79632f216fe6cb33d7899acb35b75c8303b763"))
0034         ;
0035 
0036     bool CheckBlock(int nHeight, const uint256& hash)
0037     {
0038         if (fTestNet) return true; // Testnet has no checkpoints
0039 
0040         MapCheckpoints::const_iterator i = mapCheckpoints.find(nHeight);
0041         if (i == mapCheckpoints.end()) return true;
0042         return hash == i->second;
0043     }
0044 
0045     int GetTotalBlocksEstimate()
0046     {
0047         if (fTestNet) return 0;
0048 
0049         return mapCheckpoints.rbegin()->first;
0050     }
0051 
0052     CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex)
0053     {
0054         if (fTestNet) return NULL;
0055 
0056         BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, mapCheckpoints)
0057         {
0058             const uint256& hash = i.second;
0059             std::map<uint256, CBlockIndex*>::const_iterator t = mapBlockIndex.find(hash);
0060             if (t != mapBlockIndex.end())
0061                 return t->second;
0062         }
0063         return NULL;
0064     }
0065 }