From 83f4cd156e9d52bd7c4351336dfa4806a43ee4e4 Mon Sep 17 00:00:00 2001
From: Luke Dashjr <luke-jr+git@utopios.org>
Date: Tue, 6 Sep 2011 16:39:05 -0400
Subject: Bugfix: Use timestamp in coinbase rather than "bits", needed to
 ensure coinbase txn is unique even if address is the same

---
 src/main.cpp | 7 +++----
 src/main.h   | 2 +-
 src/rpc.cpp  | 9 ++++-----
 3 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 480d2d8bbf..10308bc9dd 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2794,7 +2794,7 @@ CBlock* CreateNewBlock(CReserveKey& reservekey)
 }
 
 
-void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce, int64& nPrevTime)
+void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce)
 {
     // Update nExtraNonce
     static uint256 hashPrevBlock;
@@ -2804,7 +2804,7 @@ void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int&
         hashPrevBlock = pblock->hashPrevBlock;
     }
     ++nExtraNonce;
-    pblock->vtx[0].vin[0].scriptSig = CScript() << pblock->nBits << CBigNum(nExtraNonce);
+    pblock->vtx[0].vin[0].scriptSig = CScript() << pblock->nTime << CBigNum(nExtraNonce);
     pblock->hashMerkleRoot = pblock->BuildMerkleTree();
 }
 
@@ -2902,7 +2902,6 @@ void static BitcoinMiner(CWallet *pwallet)
     // Each thread has its own key and counter
     CReserveKey reservekey(pwallet);
     unsigned int nExtraNonce = 0;
-    int64 nPrevTime = 0;
 
     while (fGenerateBitcoins)
     {
@@ -2929,7 +2928,7 @@ void static BitcoinMiner(CWallet *pwallet)
         auto_ptr<CBlock> pblock(CreateNewBlock(reservekey));
         if (!pblock.get())
             return;
-        IncrementExtraNonce(pblock.get(), pindexPrev, nExtraNonce, nPrevTime);
+        IncrementExtraNonce(pblock.get(), pindexPrev, nExtraNonce);
 
         printf("Running BitcoinMiner with %d transactions in block\n", pblock->vtx.size());
 
diff --git a/src/main.h b/src/main.h
index 97a40d3ec9..0b05febb4d 100644
--- a/src/main.h
+++ b/src/main.h
@@ -96,7 +96,7 @@ bool ProcessMessages(CNode* pfrom);
 bool SendMessages(CNode* pto, bool fSendTrickle);
 void GenerateBitcoins(bool fGenerate, CWallet* pwallet);
 CBlock* CreateNewBlock(CReserveKey& reservekey);
-void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce, int64& nPrevTime);
+void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce);
 void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1);
 bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey);
 bool CheckProofOfWork(uint256 hash, unsigned int nBits);
diff --git a/src/rpc.cpp b/src/rpc.cpp
index 2a458423ce..33cfa77b40 100644
--- a/src/rpc.cpp
+++ b/src/rpc.cpp
@@ -1615,15 +1615,14 @@ Value getwork(const Array& params, bool fHelp)
             vNewBlock.push_back(pblock);
         }
 
-        // Update nExtraNonce
-        static unsigned int nExtraNonce = 0;
-        static int64 nPrevTime = 0;
-        IncrementExtraNonce(pblock, pindexPrev, nExtraNonce, nPrevTime);
-
         // Update nTime
         pblock->nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
         pblock->nNonce = 0;
 
+        // Update nExtraNonce
+        static unsigned int nExtraNonce = 0;
+        IncrementExtraNonce(pblock, pindexPrev, nExtraNonce);
+
         // Save
         mapNewBlock[pblock->hashMerkleRoot] = make_pair(pblock, pblock->vtx[0].vin[0].scriptSig);
 
-- 
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