From c7fa1a358620a785af50c56cc02284990f63c608 Mon Sep 17 00:00:00 2001
From: Cozz Lovan <cozzlovan@yahoo.com>
Date: Sat, 10 Aug 2013 15:26:12 +0200
Subject: [PATCH] do not call BuildMerkleTree() unnecessarily twice

---
 src/main.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.cpp b/src/main.cpp
index 9de895374..063536820 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2264,7 +2264,7 @@ bool CheckBlock(const CBlock& block, CValidationState& state, bool fCheckPOW, bo
         return state.DoS(100, error("CheckBlock() : out-of-bounds SigOpCount"));
 
     // Check merkle root
-    if (fCheckMerkleRoot && block.hashMerkleRoot != block.BuildMerkleTree())
+    if (fCheckMerkleRoot && block.hashMerkleRoot != block.vMerkleTree.back())
         return state.DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"));
 
     return true;