Remove legacy code, bump version number

[novacoin.git] / src / kernel.cpp

diff --git a/src/kernel.cpp b/src/kernel.cpp
index 1d9aa62..4b03c7f 100644 (file)
--- a/src/kernel.cpp
+++ b/src/kernel.cpp
@@ -5,21 +5,29 @@
 #include <boost/assign/list_of.hpp>
 
 #include "kernel.h"
-#include "db.h"
+#include "txdb.h"
 
 using namespace std;
 
 extern int nStakeMaxAge;
 extern int nStakeTargetSpacing;
 
+typedef std::map<int, unsigned int> MapModifierCheckpoints;
+
 // Hard checkpoints of stake modifiers to ensure they are deterministic
 static std::map<int, unsigned int> mapStakeModifierCheckpoints =
     boost::assign::map_list_of
         ( 0, 0x0e00670bu )
-        ( 6000, 0xb7cbc5d3u )
         ( 9690, 0x97dcdafau )
         ( 12661, 0x5d84115du )
-        ( 19600, 0xdded1b8du )
+        ( 37092, 0xd230afccu )
+        ( 44200, 0x05370164u )
+    ;
+
+// Hard checkpoints of stake modifiers to ensure they are deterministic (testNet)
+static std::map<int, unsigned int> mapStakeModifierCheckpointsTestNet =
+    boost::assign::map_list_of
+        ( 0, 0x0e00670bu )
     ;
 
 // Get the last stake modifier and its generation time from a given block
@@ -259,7 +267,7 @@ static bool GetKernelStakeModifier(uint256 hashBlockFrom, uint64& nStakeModifier
 //   quantities so as to generate blocks faster, degrading the system back into
 //   a proof-of-work situation.
 //
-bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned int nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, unsigned int nTimeTx, uint256& hashProofOfStake, bool fPrintProofOfStake)
+bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned int nTxPrevOffset, const CTransaction& txPrev, const COutPoint& prevout, unsigned int nTimeTx, uint256& hashProofOfStake, uint256& targetProofOfStake, bool fPrintProofOfStake)
 {
     if (nTimeTx < txPrev.nTime)  // Transaction timestamp violation
         return error("CheckStakeKernelHash() : nTime violation");
@@ -272,11 +280,26 @@ bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned
     bnTargetPerCoinDay.SetCompact(nBits);
     int64 nValueIn = txPrev.vout[prevout.n].nValue;
 
-    // v0.3 protocol kernel hash weight starts from 0 at the 30-day min age
+    int64 nTimeWeight;
+    uint256 hashBlockFrom = blockFrom.GetHash();
+
+    // Kernel hash weight starts from 0 at the 30-day min age
     // this change increases active coins participating the hash and helps
     // to secure the network when proof-of-stake difficulty is low
-    int64 nTimeWeight = min((int64)nTimeTx - txPrev.nTime, (int64)nStakeMaxAge) - nStakeMinAge;
+    //
+    if(fTestNet || (STAKEWEIGHT_SWITCH_TIME < nTimeTx))
+    {
+        // New rule since 01 Jan 2014: Maximum TimeWeight is 90 days.
+        nTimeWeight = min((int64)nTimeTx - txPrev.nTime - nStakeMinAge, (int64)nStakeMaxAge);
+    }
+    else
+    {
+        // Current rule: Maximum TimeWeight is 60 days.
+        nTimeWeight = min((int64)nTimeTx - txPrev.nTime, (int64)nStakeMaxAge) - nStakeMinAge;
+    }
+
     CBigNum bnCoinDayWeight = CBigNum(nValueIn) * nTimeWeight / COIN / (24 * 60 * 60);
+    targetProofOfStake = (bnCoinDayWeight * bnTargetPerCoinDay).getuint256();
 
     // Calculate hash
     CDataStream ss(SER_GETHASH, 0);
@@ -284,7 +307,7 @@ bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned
     int nStakeModifierHeight = 0;
     int64 nStakeModifierTime = 0;
 
-    if (!GetKernelStakeModifier(blockFrom.GetHash(), nStakeModifier, nStakeModifierHeight, nStakeModifierTime, fPrintProofOfStake))
+    if (!GetKernelStakeModifier(hashBlockFrom, nStakeModifier, nStakeModifierHeight, nStakeModifierTime, fPrintProofOfStake))
         return false;
     ss << nStakeModifier;
 
@@ -295,7 +318,7 @@ bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned
         printf("CheckStakeKernelHash() : using modifier 0x%016"PRI64x" at height=%d timestamp=%s for block from height=%d timestamp=%s\n",
             nStakeModifier, nStakeModifierHeight,
             DateTimeStrFormat(nStakeModifierTime).c_str(),
-            mapBlockIndex[blockFrom.GetHash()]->nHeight,
+            mapBlockIndex[hashBlockFrom]->nHeight,
             DateTimeStrFormat(blockFrom.GetBlockTime()).c_str());
         printf("CheckStakeKernelHash() : check protocol=%s modifier=0x%016"PRI64x" nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n",
             "0.3",
@@ -312,7 +335,7 @@ bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned
         printf("CheckStakeKernelHash() : using modifier 0x%016"PRI64x" at height=%d timestamp=%s for block from height=%d timestamp=%s\n",
             nStakeModifier, nStakeModifierHeight, 
             DateTimeStrFormat(nStakeModifierTime).c_str(),
-            mapBlockIndex[blockFrom.GetHash()]->nHeight,
+            mapBlockIndex[hashBlockFrom]->nHeight,
             DateTimeStrFormat(blockFrom.GetBlockTime()).c_str());
         printf("CheckStakeKernelHash() : pass protocol=%s modifier=0x%016"PRI64x" nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n",
             "0.3",
@@ -324,7 +347,7 @@ bool CheckStakeKernelHash(unsigned int nBits, const CBlock& blockFrom, unsigned
 }
 
 // Check kernel hash target and coinstake signature
-bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake)
+bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake, uint256& targetProofOfStake)
 {
     if (!tx.IsCoinStake())
         return error("CheckProofOfStake() : called on non-coinstake %s", tx.GetHash().ToString().c_str());
@@ -338,7 +361,10 @@ bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hash
     CTxIndex txindex;
     if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
         return tx.DoS(1, error("CheckProofOfStake() : INFO: read txPrev failed"));  // previous transaction not in main chain, may occur during initial download
+
+#ifndef USE_LEVELDB
     txdb.Close();
+#endif
 
     // Verify signature
     if (!VerifySignature(txPrev, tx, 0, true, 0))
@@ -349,7 +375,7 @@ bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hash
     if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
         return fDebug? error("CheckProofOfStake() : read block failed") : false; // unable to read block of previous transaction
 
-    if (!CheckStakeKernelHash(nBits, block, txindex.pos.nTxPos - txindex.pos.nBlockPos, txPrev, txin.prevout, tx.nTime, hashProofOfStake, fDebug))
+    if (!CheckStakeKernelHash(nBits, block, txindex.pos.nTxPos - txindex.pos.nBlockPos, txPrev, txin.prevout, tx.nTime, hashProofOfStake, targetProofOfStake, fDebug))
         return tx.DoS(1, error("CheckProofOfStake() : INFO: check kernel failed on coinstake %s, hashProof=%s", tx.GetHash().ToString().c_str(), hashProofOfStake.ToString().c_str())); // may occur during initial download or if behind on block chain sync
 
     return true;
@@ -379,8 +405,9 @@ unsigned int GetStakeModifierChecksum(const CBlockIndex* pindex)
 // Check stake modifier hard checkpoints
 bool CheckStakeModifierCheckpoints(int nHeight, unsigned int nStakeModifierChecksum)
 {
-    if (fTestNet) return true; // Testnet has no checkpoints
-    if (mapStakeModifierCheckpoints.count(nHeight))
-        return nStakeModifierChecksum == mapStakeModifierCheckpoints[nHeight];
+    MapModifierCheckpoints& checkpoints = (fTestNet ? mapStakeModifierCheckpointsTestNet : mapStakeModifierCheckpoints);
+
+    if (checkpoints.count(nHeight))
+        return nStakeModifierChecksum == checkpoints[nHeight];
     return true;
 }