Timestamp adjustment.

[novacoin.git] / src / kernel.cpp

diff --git a/src/kernel.cpp b/src/kernel.cpp
index 42d18f4..7429a38 100644 (file)
--- a/src/kernel.cpp
+++ b/src/kernel.cpp
@@ -28,15 +28,10 @@ typedef std::map<int, unsigned int> MapModifierCheckpoints;
 static std::map<int, unsigned int> mapStakeModifierCheckpoints =
     boost::assign::map_list_of
         ( 0, 0x0e00670bu )
-        ( 9690, 0x97dcdafau )
         ( 12661, 0x5d84115du )
-        ( 37092, 0xd230afccu )
-        ( 44200, 0x05370164u )
-        ( 65000, 0xc8e7be6au )
-        ( 68600, 0x73a8cc4cu )
-        ( 92161, 0xe21a911au )
-        ( 98661, 0xd20c44d4u )
         (143990, 0x9c592c78u )
+        (149000, 0x48f2bdc4u )
+        (160000, 0x789df0f0u )
     ;
 
 // Hard checkpoints of stake modifiers to ensure they are deterministic (testNet)
@@ -440,7 +435,7 @@ bool CheckStakeKernelHash(uint32_t nBits, const CBlock& blockFrom, uint32_t nTxP
 }
 
 // Scan given coins set for kernel solution
-bool ScanForStakeKernelHash(MetaMap &mapMeta, KernelSearchSettings &settings, CoinsSet::value_type &kernelcoin, uint32_t &nTimeTx, uint32_t &nBlockTime, uint64_t &nKernelsTried, uint64_t &nCoinDaysTried)
+bool ScanForStakeKernelHash(MetaMap &mapMeta, uint32_t nBits, uint32_t nTime, uint32_t nSearchInterval, CoinsSet::value_type &kernelcoin, uint32_t &nTimeTx, uint32_t &nBlockTime, uint64_t &nKernelsTried, uint64_t &nCoinDaysTried)
 {
     uint256 hashProofOfStake = 0;
 
@@ -457,21 +452,21 @@ bool ScanForStakeKernelHash(MetaMap &mapMeta, KernelSearchSettings &settings, Co
         // Get coin
         CoinsSet::value_type pcoin = meta_item->second.first.second;
 
-        static int nMaxStakeSearchInterval = 60;
+        static unsigned int nMaxStakeSearchInterval = 60;
 
         // only count coins meeting min age requirement
-        if (nStakeMinAge + block.nTime > settings.nTime - nMaxStakeSearchInterval)
+        if (nStakeMinAge + block.nTime > nTime - nMaxStakeSearchInterval)
             continue;
 
         // Transaction offset inside block
         uint32_t nTxOffset = txindex.pos.nTxPos - txindex.pos.nBlockPos;
 
         // Current timestamp scanning interval
-        unsigned int nCurrentSearchInterval = min((int64_t)settings.nSearchInterval, (int64_t)nMaxStakeSearchInterval);
+        unsigned int nCurrentSearchInterval = min(nSearchInterval, nMaxStakeSearchInterval);
 
         nBlockTime = block.nTime;
         CBigNum bnTargetPerCoinDay;
-        bnTargetPerCoinDay.SetCompact(settings.nBits);
+        bnTargetPerCoinDay.SetCompact(nBits);
         int64_t nValueIn = pcoin.first->vout[pcoin.second].nValue;
 
         // Search backward in time from the given timestamp 
@@ -479,7 +474,7 @@ bool ScanForStakeKernelHash(MetaMap &mapMeta, KernelSearchSettings &settings, Co
         // Stopping search in case of shutting down or cache invalidation
         for (unsigned int n=0; n<nCurrentSearchInterval && fCoinsDataActual && !fShutdown; n++)
         {
-            nTimeTx = settings.nTime - n;
+            nTimeTx = nTime - n;
             CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)pcoin.first->nTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60);
             CBigNum bnTargetProofOfStake = bnCoinDayWeight * bnTargetPerCoinDay;
 
@@ -514,6 +509,66 @@ bool ScanForStakeKernelHash(MetaMap &mapMeta, KernelSearchSettings &settings, Co
     return false;
 }
 
+// Scan given input for kernel solution
+bool ScanInputForStakeKernelHash(CTransaction &tx, uint32_t nOut, uint32_t nBits, uint32_t nSearchInterval, std::pair<uint256, uint32_t> &solution)
+{
+    CTxDB txdb("r");
+
+    CBlock block;
+    CTxIndex txindex;
+
+    // Load transaction index item
+    if (!txdb.ReadTxIndex(tx.GetHash(), txindex))
+        return false;
+
+    // Read block header
+    if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
+        return false;
+
+    uint64_t nStakeModifier = 0;
+    if (!GetKernelStakeModifier(block.GetHash(), nStakeModifier))
+        return false;
+
+    uint32_t nTime = GetTime();
+    // Only count coins meeting min age requirement
+    if (nStakeMinAge + block.nTime > nTime)
+        nTime += (nStakeMinAge + block.nTime - nTime);
+
+    // Transaction offset inside block
+    uint32_t nTxOffset = txindex.pos.nTxPos - txindex.pos.nBlockPos;
+    int64_t nValueIn = tx.vout[nOut].nValue;
+
+    CBigNum bnTargetPerCoinDay;
+    bnTargetPerCoinDay.SetCompact(nBits);
+
+    // Search forward in time from the given timestamp
+    // Stopping search in case of shutting down
+    for (unsigned int n=0; n<nSearchInterval && !fShutdown; n++)
+    {
+        uint32_t nTimeTx = nTime + n;
+        CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)tx.nTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60);
+        CBigNum bnTargetProofOfStake = bnCoinDayWeight * bnTargetPerCoinDay;
+
+        // Build kernel
+        CDataStream ss(SER_GETHASH, 0);
+        ss << nStakeModifier;
+        ss << block.nTime << nTxOffset << tx.nTime << nOut << nTimeTx;
+
+        // Calculate kernel hash
+        uint256 hashProofOfStake = Hash(ss.begin(), ss.end());
+
+        if (bnTargetProofOfStake >= CBigNum(hashProofOfStake))
+        {
+            solution.first = hashProofOfStake;
+            solution.second = nTimeTx;
+
+            return true;
+        }
+    }
+
+    return false;
+}
+
 // Check kernel hash target and coinstake signature
 bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake, uint256& targetProofOfStake)
 {