From 66e7e3ca93ec48647a8072f9124128cb1234f65c Mon Sep 17 00:00:00 2001
From: alex <alex@alex-VirtualBox.(none)>
Date: Mon, 20 Jan 2014 02:41:14 +0400
Subject: [PATCH] Add previous block checking in the proof-of-stake miner

This should help against orphans.
---
 src/miner.cpp  |    4 +---
 src/wallet.cpp |   48 +++---------------------------------------------
 2 files changed, 4 insertions(+), 48 deletions(-)

diff --git a/src/miner.cpp b/src/miner.cpp
index f9d23cb..d5ace13 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -381,7 +381,7 @@ void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int&
     }
     ++nExtraNonce;
 
-    unsigned int nHeight = pindexPrev->nHeight+1; // Height first in coinbase required for block.version=2
+    unsigned int nHeight = pindexPrev->nHeight+1; // Height first in coinbase required
     pblock->vtx[0].vin[0].scriptSig = (CScript() << nHeight << CBigNum(nExtraNonce)) + COINBASE_FLAGS;
     assert(pblock->vtx[0].vin[0].scriptSig.size() <= 100);
 
@@ -564,7 +564,5 @@ void StakeMiner(CWallet *pwallet)
         }
         else
             Sleep(nMinerSleep);
-
-        continue;
     }
 }
diff --git a/src/wallet.cpp b/src/wallet.cpp
index 12799fd..7ee94f1 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -15,7 +15,7 @@
 
 using namespace std;
 extern int nStakeMaxAge;
-
+extern unsigned int nTransactionsUpdated;
 
 //////////////////////////////////////////////////////////////////////////////
 //
@@ -1438,27 +1438,6 @@ bool CWallet::GetStakeWeight(const CKeyStore& keystore, uint64& nMinWeight, uint
         return false;
 
     vector<const CWalletTx*> vwtxPrev;
-
-/*
- * TODO: performance comparison
-
-    static set<pair<const CWalletTx*,unsigned int> > setCoins;
-    static uint256 hashPrevBlock;
-    static int64 nValueIn = 0;
-
-    // Cache outputs unless best block changed
-    if (hashPrevBlock != pindexBest->GetBlockHash())
-    {
-        if (!SelectCoinsSimple(nBalance - nReserveBalance, GetAdjustedTime(), nCoinbaseMaturity * 10, setCoins, nValueIn))
-            return false;
-
-        if (setCoins.empty())
-            return false;
-
-        hashPrevBlock == pindexBest->GetBlockHash();
-    }
-*/
-
     set<pair<const CWalletTx*,unsigned int> > setCoins;
     int64 nValueIn = 0;
 
@@ -1508,7 +1487,7 @@ bool CWallet::CreateCoinStake(const CKeyStore& keystore, unsigned int nBits, int
     // The following combine threshold is important to security
     // Should not be adjusted if you don't understand the consequences
     int64 nCombineThreshold = GetProofOfWorkReward(GetLastBlockIndex(pindexBest, false)->nBits) / 3;
-
+    CBlockIndex* pindexPrev = pindexBest;
     CBigNum bnTargetPerCoinDay;
     bnTargetPerCoinDay.SetCompact(nBits);
 
@@ -1531,27 +1510,6 @@ bool CWallet::CreateCoinStake(const CKeyStore& keystore, unsigned int nBits, int
         return false;
 
     vector<const CWalletTx*> vwtxPrev;
-
-/*
- * TODO: performance comparison
-
-    static set<pair<const CWalletTx*,unsigned int> > setCoins;
-    static uint256 hashPrevBlock;
-    static int64 nValueIn = 0;
-
-    // Cache outputs unless best block changed
-    if (hashPrevBlock != pindexBest->GetBlockHash())
-    {
-        if (!SelectCoinsSimple(nBalance - nReserveBalance, txNew.nTime, nCoinbaseMaturity * 10, setCoins, nValueIn))
-            return false;
-
-        if (setCoins.empty())
-            return false;
-
-        hashPrevBlock == pindexBest->GetBlockHash();
-    }
-*/
-
     set<pair<const CWalletTx*,unsigned int> > setCoins;
     int64 nValueIn = 0;
 
@@ -1600,7 +1558,7 @@ bool CWallet::CreateCoinStake(const CKeyStore& keystore, unsigned int nBits, int
 
 
         bool fKernelFound = false;
-        for (unsigned int n=0; n<min(nSearchInterval,(int64)nMaxStakeSearchInterval) && !fKernelFound && !fShutdown; n++)
+        for (unsigned int n=0; n<min(nSearchInterval,(int64)nMaxStakeSearchInterval) && !fKernelFound && !fShutdown && pindexPrev == pindexBest; n++)
         {
             // Search backward in time from the given txNew timestamp 
             // Search nSearchInterval seconds back up to nMaxStakeSearchInterval
-- 
1.7.1