From feeb761ba07af74a7cd78b8c8f7c2a961fd9ea1c Mon Sep 17 00:00:00 2001
From: Gavin Andresen <gavinandresen@gmail.com>
Date: Thu, 12 Apr 2012 21:26:35 -0400
Subject: [PATCH 1/3] Testnet, Mark III

---
 src/irc.cpp  | 4 ++--
 src/main.cpp | 6 ++----
 src/util.cpp | 2 +-
 3 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/src/irc.cpp b/src/irc.cpp
index 10491884..c0b3b747 100644
--- a/src/irc.cpp
+++ b/src/irc.cpp
@@ -291,8 +291,8 @@ void ThreadIRCSeed2(void* parg)
         }
         
         if (fTestNet) {
-            Send(hSocket, "JOIN #bitcoinTEST\r");
-            Send(hSocket, "WHO #bitcoinTEST\r");
+            Send(hSocket, "JOIN #bitcoinTEST3\r");
+            Send(hSocket, "WHO #bitcoinTEST3\r");
         } else {
             // randomly join #bitcoin00-#bitcoin99
             int channel_number = GetRandInt(100);
diff --git a/src/main.cpp b/src/main.cpp
index 96718cf1..dd1a7b90 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1926,12 +1926,11 @@ bool LoadBlockIndex(bool fAllowNew)
 {
     if (fTestNet)
     {
-        hashGenesisBlock = uint256("0x00000007199508e34a9ff81e6ec0c477a4cccff2a4767a8eee39c11db367b008");
-        bnProofOfWorkLimit = CBigNum(~uint256(0) >> 28);
         pchMessageStart[0] = 0xfa;
         pchMessageStart[1] = 0xbf;
         pchMessageStart[2] = 0xb5;
         pchMessageStart[3] = 0xda;
+        hashGenesisBlock = uint256("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943");
     }
 
     //
@@ -1977,8 +1976,7 @@ bool LoadBlockIndex(bool fAllowNew)
         if (fTestNet)
         {
             block.nTime    = 1296688602;
-            block.nBits    = 0x1d07fff8;
-            block.nNonce   = 384568319;
+            block.nNonce   = 414098458;
         }
 
         //// debug print
diff --git a/src/util.cpp b/src/util.cpp
index 3ab30baf..b07c9c1b 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -834,7 +834,7 @@ const boost::filesystem::path &GetDataDir(bool fNetSpecific)
         path = GetDefaultDataDir();
     }
     if (fNetSpecific && GetBoolArg("-testnet", false))
-        path /= "testnet";
+        path /= "testnet3";
 
     fs::create_directory(path);
 

From 248bceb30c9ff3100f11a4755d8f0832f5189c14 Mon Sep 17 00:00:00 2001
From: Gavin Andresen <gavinandresen@gmail.com>
Date: Fri, 13 Apr 2012 14:38:05 -0400
Subject: [PATCH 2/3] Fix issue#1082, testnet difficulty unsigned integer
 underflow

---
 src/main.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index dd1a7b90..baffffd3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -865,12 +865,12 @@ unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBl
     // Only change once per interval
     if ((pindexLast->nHeight+1) % nInterval != 0)
     {
-        // Special rules for testnet after 15 Feb 2012:
-        if (fTestNet && pblock->nTime > 1329264000)
+        // Special difficulty rule for testnet:
+        if (fTestNet)
         {
             // If the new block's timestamp is more than 2* 10 minutes
             // then allow mining of a min-difficulty block.
-            if (pblock->nTime - pindexLast->nTime > nTargetSpacing*2)
+            if (pblock->nTime > pindexLast->nTime + nTargetSpacing*2)
                 return nProofOfWorkLimit;
             else
             {

From c87c8cd16344c7f7b45912bb0c68876f646eb04e Mon Sep 17 00:00:00 2001
From: Gavin Andresen <gavinandresen@gmail.com>
Date: Fri, 13 Apr 2012 14:53:31 -0400
Subject: [PATCH 3/3] Add a testnet checkpoint at block 546

---
 src/checkpoints.cpp | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/checkpoints.cpp b/src/checkpoints.cpp
index 6679bc93..6f7a92bb 100644
--- a/src/checkpoints.cpp
+++ b/src/checkpoints.cpp
@@ -35,27 +35,32 @@ namespace Checkpoints
         (168000, uint256("0x000000000000099e61ea72015e79632f216fe6cb33d7899acb35b75c8303b763"))
         ;
 
+    static MapCheckpoints mapCheckpointsTestnet =
+        boost::assign::map_list_of
+        ( 546, uint256("000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70"))
+        ;
+
     bool CheckBlock(int nHeight, const uint256& hash)
     {
-        if (fTestNet) return true; // Testnet has no checkpoints
+        MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
 
-        MapCheckpoints::const_iterator i = mapCheckpoints.find(nHeight);
-        if (i == mapCheckpoints.end()) return true;
+        MapCheckpoints::const_iterator i = checkpoints.find(nHeight);
+        if (i == checkpoints.end()) return true;
         return hash == i->second;
     }
 
     int GetTotalBlocksEstimate()
     {
-        if (fTestNet) return 0;
+        MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
 
-        return mapCheckpoints.rbegin()->first;
+        return checkpoints.rbegin()->first;
     }
 
     CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex)
     {
-        if (fTestNet) return NULL;
+        MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
 
-        BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, mapCheckpoints)
+        BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, checkpoints)
         {
             const uint256& hash = i.second;
             std::map<uint256, CBlockIndex*>::const_iterator t = mapBlockIndex.find(hash);