From 5a47811da5158df763aa2fca09ce646ee0c51e7b Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Mon, 19 Jan 2015 18:37:21 -0500
Subject: BIP66 changeover logic

---
 src/main.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'src/main.cpp')

diff --git a/src/main.cpp b/src/main.cpp
index 7cc69c318b..f20575eaf2 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1764,6 +1764,11 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
 
     unsigned int flags = fStrictPayToScriptHash ? SCRIPT_VERIFY_P2SH : SCRIPT_VERIFY_NONE;
 
+    // Start enforcing the DERSIG (BIP66) rules, for block.nVersion=3 blocks, when 75% of the network has upgraded:
+    if (block.nVersion >= 3 && IsSuperMajority(3, pindex->pprev, Params().EnforceBlockUpgradeMajority())) {
+        flags |= SCRIPT_VERIFY_DERSIG;
+    }
+
     CBlockUndo blockundo;
 
     CCheckQueueControl<CScriptCheck> control(fScriptChecks && nScriptCheckThreads ? &scriptcheckqueue : NULL);
@@ -2601,6 +2606,13 @@ bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& sta
                              REJECT_OBSOLETE, "bad-version");
     }
 
+    // Reject block.nVersion=2 blocks when 95% (75% on testnet) of the network has upgraded:
+    if (block.nVersion < 3 && IsSuperMajority(3, pindexPrev, Params().RejectBlockOutdatedMajority()))
+    {
+        return state.Invalid(error("%s : rejected nVersion=2 block", __func__),
+                             REJECT_OBSOLETE, "bad-version");
+    }
+
     return true;
 }
 
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