1 // Copyright (c) 2011 The Bitcoin developers
2 // Copyright (c) 2011-2012 The PPCoin developers
3 // Distributed under the MIT/X11 software license, see the accompanying
4 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
5 #ifndef BITCOIN_CHECKPOINT_H
6 #define BITCOIN_CHECKPOINT_H
11 // ppcoin: auto checkpoint min at 8 hours; max at 16 hours
12 #define AUTO_CHECKPOINT_MIN_SPAN (60 * 60 * 8)
13 #define AUTO_CHECKPOINT_MAX_SPAN (60 * 60 * 16)
14 #define AUTO_CHECKPOINT_TRUST_SPAN (60 * 60 * 24)
19 // ppcoin: synchronized checkpoint
20 class CUnsignedSyncCheckpoint
24 uint256 hashCheckpoint; // checkpoint block
28 READWRITE(this->nVersion);
29 nVersion = this->nVersion;
30 READWRITE(hashCheckpoint);
39 std::string ToString() const
44 " hashCheckpoint = %s\n"
47 hashCheckpoint.ToString().c_str());
52 printf("%s", ToString().c_str());
56 class CSyncCheckpoint : public CUnsignedSyncCheckpoint
59 std::vector<unsigned char> vchMsg;
60 std::vector<unsigned char> vchSig;
75 CUnsignedSyncCheckpoint::SetNull();
82 return (hashCheckpoint == 0);
85 uint256 GetHash() const
87 return SerializeHash(*this);
90 bool RelayTo(CNode* pnode) const
92 // returns true if wasn't already sent
93 if (pnode->hashCheckpointKnown != hashCheckpoint)
95 pnode->hashCheckpointKnown = hashCheckpoint;
96 pnode->PushMessage("checkpoint", *this);
102 bool CheckSignature()
105 if (!key.SetPubKey(ParseHex("04ea21daea8c15559870b5e93750ddc2f0c16bd0cb16636ba88c0746cfac07912ec7ad14111cc4aedda12c2687c920c7b7b62fd67ca14eed53f2d1704ec72362ce")))
106 return error("CSyncCheckpoint::CheckSignature() : SetPubKey failed");
107 if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig))
108 return error("CSyncCheckpoint::CheckSignature() : verify signature failed");
110 // Now unserialize the data
111 CDataStream sMsg(vchMsg);
112 sMsg >> *(CUnsignedSyncCheckpoint*)this;
116 bool ProcessSyncCheckpoint(CNode* pfrom);
120 // Block-chain checkpoints are compiled-in sanity checks.
121 // They are updated every release or three.
123 namespace Checkpoints
125 // Returns true if block passes checkpoint checks
126 bool CheckHardened(int nHeight, const uint256& hash);
128 // Return conservative estimate of total number of blocks, 0 if unknown
129 int GetTotalBlocksEstimate();
131 // Returns last CBlockIndex* in mapBlockIndex that is a checkpoint
132 CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex);
134 extern uint256 hashSyncCheckpoint;
135 extern CSyncCheckpoint checkpointMessage;
136 extern uint256 hashInvalidCheckpoint;
137 extern CCriticalSection cs_hashSyncCheckpoint;
139 bool AcceptPendingSyncCheckpoint();
140 uint256 AutoSelectSyncCheckpoint();
141 bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev);
142 bool IsPendingSyncCheckpoint(uint256 hashBlock);
144 // ppcoin: automatic checkpoint
145 extern int nAutoCheckpoint;
146 extern int nBranchPoint;
148 bool CheckAuto(const CBlockIndex *pindex);
149 int GetNextChainCheckpoint(const CBlockIndex *pindex);
150 int GetNextAutoCheckpoint(int nCheckpoint);
151 void AdvanceAutoCheckpoint(int nCheckpoint);
152 bool ResetAutoCheckpoint(int nCheckpoint);