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)
20 // Block-chain checkpoints are compiled-in sanity checks.
21 // They are updated every release or three.
25 // Returns true if block passes checkpoint checks
26 bool CheckHardened(int nHeight, const uint256& hash);
28 // Return conservative estimate of total number of blocks, 0 if unknown
29 int GetTotalBlocksEstimate();
31 // Returns last CBlockIndex* in mapBlockIndex that is a checkpoint
32 CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex);
34 // ppcoin: synchronized checkpoint
35 class CUnsignedSyncCheckpoint
39 uint256 hashCheckpoint; // checkpoint block
43 READWRITE(this->nVersion);
44 nVersion = this->nVersion;
45 READWRITE(hashCheckpoint);
54 std::string ToString() const
59 " hashCheckpoint = %s\n"
62 hashCheckpoint.ToString().c_str());
67 printf("%s", ToString().c_str());
71 class CSyncCheckpoint : public CUnsignedSyncCheckpoint
74 std::vector<unsigned char> vchMsg;
75 std::vector<unsigned char> vchSig;
90 CUnsignedSyncCheckpoint::SetNull();
97 return (hashCheckpoint == 0);
100 uint256 GetHash() const
102 return SerializeHash(*this);
105 bool RelayTo(CNode* pnode) const
107 // returns true if wasn't already sent
108 if (pnode->hashCheckpointKnown != hashCheckpoint)
110 pnode->hashCheckpointKnown = hashCheckpoint;
111 pnode->PushMessage("checkpoint", *this);
117 bool CheckSignature()
120 if (!key.SetPubKey(ParseHex("0487ca85b6ae9d311f996c7616d20d0c88a5b4f07d25e78f419019f35cce6522acf978b2d99f0e7a58db1f120439e5c1889266927854aa57c93956c2569188a539")))
121 return error("CSyncCheckpoint::CheckSignature() : SetPubKey failed");
122 if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig))
123 return error("CSyncCheckpoint::CheckSignature() : verify signature failed");
125 // Now unserialize the data
126 CDataStream sMsg(vchMsg);
127 sMsg >> *(CUnsignedSyncCheckpoint*)this;
131 bool ProcessSyncCheckpoint(CNode* pfrom);
134 extern uint256 hashSyncCheckpoint;
135 extern CSyncCheckpoint checkpointMessage;
136 extern CCriticalSection cs_hashSyncCheckpoint;
138 // ppcoin: automatic checkpoint
139 extern int nAutoCheckpoint;
140 extern int nBranchPoint;
142 bool CheckAuto(const CBlockIndex *pindex);
143 int GetNextChainCheckpoint(const CBlockIndex *pindex);
144 int GetNextAutoCheckpoint(int nCheckpoint);
145 void AdvanceAutoCheckpoint(int nCheckpoint);
146 bool ResetAutoCheckpoint(int nCheckpoint);