Add checkpoint at block 14189, v3 lock-in since supermajority and bnProofOfStakeLimit...

[novacoin.git] / src / checkpoints.cpp

diff --git a/src/checkpoints.cpp b/src/checkpoints.cpp
index bd4eba7..ac884ec 100644 (file)
--- a/src/checkpoints.cpp
+++ b/src/checkpoints.cpp
@@ -1,5 +1,6 @@
 // Copyright (c) 2009-2012 The Bitcoin developers
-// Copyright (c) 2011-2012 The PPCoin developers
+// Copyright (c) 2011-2013 The PPCoin developers
+// Copyright (c) 2013 NovaCoin Developers
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -26,7 +27,11 @@ namespace Checkpoints
     static MapCheckpoints mapCheckpoints =
         boost::assign::map_list_of
         ( 0, hashGenesisBlockOfficial )
-        ; // ppcoin: no checkpoint yet; to be created in future releases
+        ( 6000, uint256("0x000000000945e3c9d8e15df834e802521eb79f9ceb4191a27bdfadad4b777f4a"))
+        ( 8700, uint256("0x00000000014270724837789c9a69859290f6bdee38556bc4561c21f17935a178"))
+        ( 13560, uint256("0xa1591a0fcbf11f282d671581edb9f0aadcd06fee69761081e0a3245914c13729"))
+        ( 14189, uint256("0x00000000020f76474d2522b19c7bfafc43ba6ecbabae54293bcd9546159c8c1d"))
+        ;
 
     bool CheckHardened(int nHeight, const uint256& hash)
     {
@@ -158,12 +163,13 @@ namespace Checkpoints
             CBlockIndex* pindexCheckpoint = mapBlockIndex[hashPendingCheckpoint];
             if (!pindexCheckpoint->IsInMainChain())
             {
-                txdb.TxnBegin();
-                if (!Reorganize(txdb, pindexCheckpoint))
+                CBlock block;
+                if (!block.ReadFromDisk(pindexCheckpoint))
+                    return error("AcceptPendingSyncCheckpoint: ReadFromDisk failed for sync checkpoint %s", hashPendingCheckpoint.ToString().c_str());
+                if (!block.SetBestChain(txdb, pindexCheckpoint))
                 {
-                    txdb.TxnAbort();
                     hashInvalidCheckpoint = hashPendingCheckpoint;
-                    return error("ProcessSyncCheckpoint: Reorganize failed for sync checkpoint %s", hashPendingCheckpoint.ToString().c_str());
+                    return error("AcceptPendingSyncCheckpoint: SetBestChain failed for sync checkpoint %s", hashPendingCheckpoint.ToString().c_str());
                 }
             }
             txdb.Close();
@@ -185,6 +191,21 @@ namespace Checkpoints
         return false;
     }
 
+    // Automatically select a suitable sync-checkpoint 
+    uint256 AutoSelectSyncCheckpoint()
+    {
+        // Proof-of-work blocks are immediately checkpointed
+        // to defend against 51% attack which rejects other miners block 
+
+        // Select the last proof-of-work block
+        const CBlockIndex *pindex = GetLastBlockIndex(pindexBest, false);
+        // Search forward for a block within max span and maturity window
+        while (pindex->pnext && (pindex->GetBlockTime() + CHECKPOINT_MAX_SPAN <= pindexBest->GetBlockTime() || pindex->nHeight + std::min(6, nCoinbaseMaturity - 20) <= pindexBest->nHeight))
+            pindex = pindex->pnext;
+        return pindex->GetBlockHash();
+    }
+
+    // Check against synchronized checkpoint
     bool CheckSync(const uint256& hashBlock, const CBlockIndex* pindexPrev)
     {
         if (fTestNet) return true; // Testnet has no checkpoints
@@ -233,13 +254,14 @@ namespace Checkpoints
         if (mapBlockIndex.count(hash) && !mapBlockIndex[hash]->IsInMainChain())
         {
             // checkpoint block accepted but not yet in main chain
-            printf("ResetSyncCheckpoint: Reorganize to hardened checkpoint %s\n", hash.ToString().c_str());
+            printf("ResetSyncCheckpoint: SetBestChain to hardened checkpoint %s\n", hash.ToString().c_str());
             CTxDB txdb;
-            txdb.TxnBegin();
-            if (!Reorganize(txdb, mapBlockIndex[hash]))
+            CBlock block;
+            if (!block.ReadFromDisk(mapBlockIndex[hash]))
+                return error("ResetSyncCheckpoint: ReadFromDisk failed for hardened checkpoint %s", hash.ToString().c_str());
+            if (!block.SetBestChain(txdb, mapBlockIndex[hash]))
             {
-                txdb.TxnAbort();
-                return error("ResetSyncCheckpoint: Reorganize failed for hardened checkpoint %s", hash.ToString().c_str());
+                return error("ResetSyncCheckpoint: SetBestChain failed for hardened checkpoint %s", hash.ToString().c_str());
             }
             txdb.Close();
         }
@@ -273,6 +295,26 @@ namespace Checkpoints
             pfrom->AskFor(CInv(MSG_BLOCK, hashPendingCheckpoint));
     }
 
+    bool SetCheckpointPrivKey(std::string strPrivKey)
+    {
+        // Test signing a sync-checkpoint with genesis block
+        CSyncCheckpoint checkpoint;
+        checkpoint.hashCheckpoint = hashGenesisBlock;
+        CDataStream sMsg(SER_NETWORK, PROTOCOL_VERSION);
+        sMsg << (CUnsignedSyncCheckpoint)checkpoint;
+        checkpoint.vchMsg = std::vector<unsigned char>(sMsg.begin(), sMsg.end());
+
+        std::vector<unsigned char> vchPrivKey = ParseHex(strPrivKey);
+        CKey key;
+        key.SetPrivKey(CPrivKey(vchPrivKey.begin(), vchPrivKey.end())); // if key is not correct openssl may crash
+        if (!key.Sign(Hash(checkpoint.vchMsg.begin(), checkpoint.vchMsg.end()), checkpoint.vchSig))
+            return false;
+
+        // Test signing successful, proceed
+        CSyncCheckpoint::strMasterPrivKey = strPrivKey;
+        return true;
+    }
+
     bool SendSyncCheckpoint(uint256 hashCheckpoint)
     {
         CSyncCheckpoint checkpoint;
@@ -290,7 +332,11 @@ namespace Checkpoints
             return error("SendSyncCheckpoint: Unable to sign checkpoint, check private key?");
 
         if(!checkpoint.ProcessSyncCheckpoint(NULL))
-            return error("SendSyncCheckpoint: Failed to process checkpoint.");
+        {
+            printf("WARNING: SendSyncCheckpoint: Failed to process checkpoint.\n");
+            return false;
+        }
+
         // Relay checkpoint
         {
             LOCK(cs_vNodes);
@@ -299,10 +345,31 @@ namespace Checkpoints
         }
         return true;
     }
+
+    // Is the sync-checkpoint outside maturity window?
+    bool IsMatureSyncCheckpoint()
+    {
+        LOCK(cs_hashSyncCheckpoint);
+        // sync-checkpoint should always be accepted block
+        assert(mapBlockIndex.count(hashSyncCheckpoint));
+        const CBlockIndex* pindexSync = mapBlockIndex[hashSyncCheckpoint];
+        return (nBestHeight >= pindexSync->nHeight + nCoinbaseMaturity ||
+                pindexSync->GetBlockTime() + nStakeMinAge < GetAdjustedTime());
+    }
+
+    // Is the sync-checkpoint too old?
+    bool IsSyncCheckpointTooOld(unsigned int nSeconds)
+    {
+        LOCK(cs_hashSyncCheckpoint);
+        // sync-checkpoint should always be accepted block
+        assert(mapBlockIndex.count(hashSyncCheckpoint));
+        const CBlockIndex* pindexSync = mapBlockIndex[hashSyncCheckpoint];
+        return (pindexSync->GetBlockTime() + nSeconds < GetAdjustedTime());
+    }
 }
 
 // ppcoin: sync-checkpoint master key
-const std::string CSyncCheckpoint::strMasterPubKey = "0424f20205e5da98ba632bbd278a11a6499585f62bfb2c782377ef59f0251daab8085fc31471bcb8180bc75ed0fa41bb50c7c084511d54015a3a5241d645c7268a";
+const std::string CSyncCheckpoint::strMasterPubKey = "04a51b735f816de4ec3f891d5b38bbc91e1f7245c7c08d17990760b86b4d8fc3910a850ffecf73bfa8886f01739a0c4c4322201282d07b6e48ce931cc92af94850";
 
 std::string CSyncCheckpoint::strMasterPrivKey = "";
 
@@ -353,12 +420,13 @@ bool CSyncCheckpoint::ProcessSyncCheckpoint(CNode* pfrom)
     if (!pindexCheckpoint->IsInMainChain())
     {
         // checkpoint chain received but not yet main chain
-        txdb.TxnBegin();
-        if (!Reorganize(txdb, pindexCheckpoint))
+        CBlock block;
+        if (!block.ReadFromDisk(pindexCheckpoint))
+            return error("ProcessSyncCheckpoint: ReadFromDisk failed for sync checkpoint %s", hashCheckpoint.ToString().c_str());
+        if (!block.SetBestChain(txdb, pindexCheckpoint))
         {
-            txdb.TxnAbort();
             Checkpoints::hashInvalidCheckpoint = hashCheckpoint;
-            return error("ProcessSyncCheckpoint: Reorganize failed for sync checkpoint %s", hashCheckpoint.ToString().c_str());
+            return error("ProcessSyncCheckpoint: SetBestChain failed for sync checkpoint %s", hashCheckpoint.ToString().c_str());
         }
     }
     txdb.Close();