Introduce a CChainParameters singleton class and regtest mode.

The new class is accessed via the Params() method and holds most things that vary between main, test and regtest networks. The regtest mode has two purposes, one is to run the bitcoind/bitcoinj comparison tool which compares two separate implementations of the Bitcoin protocol looking for divergence. The other is that when run, you get a local node which can mine a single block instantly, which is highly convenient for testing apps during development as there's no need to wait 10 minutes for a block on the testnet.
author: Mike Hearn <hearn@google.com> 2013-05-07 15:16:25 +0200
committer: Mike Hearn <hearn@google.com> 2013-06-19 16:28:52 +0200
commit: 0e4b31755534fac4ea6c20a60f719e3694252220 (patch)
tree: 80f576f67c855485e5d82007b98a45536bbf2f9a
parent: 70e7fba06da36218688a4cae4a5d12332c714247 (diff)
27 files changed, 540 insertions, 571 deletions
diff --git a/bitcoin-qt.pro b/bitcoin-qt.pro
index 8f49dccee3..1d62941e68 100644
--- a/bitcoin-qt.pro
+++ b/bitcoin-qt.pro
@@ -147,6 +147,7 @@ HEADERS += src/qt/bitcoingui.h \
     src/addrman.h \
     src/base58.h \
     src/bignum.h \
+    src/chainparams.h \
     src/checkpoints.h \
     src/compat.h \
     src/sync.h \
@@ -227,6 +228,7 @@ SOURCES += src/qt/bitcoin.cpp \
     src/qt/editaddressdialog.cpp \
     src/qt/bitcoinaddressvalidator.cpp \
     src/alert.cpp \
+    src/chainparams.cpp \
     src/version.cpp \
     src/sync.cpp \
     src/util.cpp \
diff --git a/contrib/test-patches/bitcoind-comparison.patch b/contrib/test-patches/bitcoind-comparison.patch
deleted file mode 100644
index f82b102e2a..0000000000
--- a/contrib/test-patches/bitcoind-comparison.patch
+++ /dev/null
@@ -1,196 +0,0 @@
-diff --git a/contrib/test-patches/bitcoind-comparison.patch b/contrib/test-patches/bitcoind-comparison.patch
-index 04a8618..519429a 100644
---- a/src/main.cpp
-+++ b/src/main.cpp
-@@ -31,8 +31,8 @@ CTxMemPool mempool;
- 
- map<uint256, CBlockIndex*> mapBlockIndex;
- std::vector<CBlockIndex*> vBlockIndexByHeight;
--uint256 hashGenesisBlock("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f");
--static CBigNum bnProofOfWorkLimit(~uint256(0) >> 32);
-+uint256 hashGenesisBlock("0x0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206");
-+static CBigNum bnProofOfWorkLimit(~uint256(0) >> 1);
- CBlockIndex* pindexGenesisBlock = NULL;
- int nBestHeight = -1;
- uint256 nBestChainWork = 0;
-@@ -1055,7 +1055,7 @@ int64 static GetBlockValue(int nHeight, int64 nFees)
-     int64 nSubsidy = 50 * COIN;
- 
-     // Subsidy is cut in half every 210000 blocks, which will occur approximately every 4 years
--    nSubsidy >>= (nHeight / 210000);
-+    nSubsidy >>= (nHeight / 150);
- 
-     return nSubsidy + nFees;
- }
-@@ -2736,9 +2736,9 @@ bool InitBlockIndex() {
-         block.hashPrevBlock = 0;
-         block.hashMerkleRoot = block.BuildMerkleTree();
-         block.nVersion = 1;
--        block.nTime    = 1231006505;
--        block.nBits    = 0x1d00ffff;
--        block.nNonce   = 2083236893;
-+        block.nTime    = 1296688602;
-+        block.nBits    = 0x207fffff;
-+        block.nNonce   = 2;
- 
-         if (fTestNet)
-         {
-@@ -3024,7 +3024,7 @@ bool static AlreadyHave(const CInv& inv)
- // The message start string is designed to be unlikely to occur in normal data.
- // The characters are rarely used upper ASCII, not valid as UTF-8, and produce
- // a large 4-byte int at any alignment.
--unsigned char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
-+unsigned char pchMessageStart[4] = { 0xfa, 0xbf, 0xb5, 0xda };
- 
- 
- void static ProcessGetData(CNode* pfrom)
-diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp
-index af28465..ee9a4db 100644
---- a/src/test/miner_tests.cpp
-+++ b/src/test/miner_tests.cpp
-@@ -15,34 +15,117 @@ struct {
-     unsigned char extranonce;
-     unsigned int nonce;
- } blockinfo[] = {
--    {4, 0xa4a3e223}, {2, 0x15c32f9e}, {1, 0x0375b547}, {1, 0x7004a8a5},
--    {2, 0xce440296}, {2, 0x52cfe198}, {1, 0x77a72cd0}, {2, 0xbb5d6f84},
--    {2, 0x83f30c2c}, {1, 0x48a73d5b}, {1, 0xef7dcd01}, {2, 0x6809c6c4},
--    {2, 0x0883ab3c}, {1, 0x087bbbe2}, {2, 0x2104a814}, {2, 0xdffb6daa},
--    {1, 0xee8a0a08}, {2, 0xba4237c1}, {1, 0xa70349dc}, {1, 0x344722bb},
--    {3, 0xd6294733}, {2, 0xec9f5c94}, {2, 0xca2fbc28}, {1, 0x6ba4f406},
--    {2, 0x015d4532}, {1, 0x6e119b7c}, {2, 0x43e8f314}, {2, 0x27962f38},
--    {2, 0xb571b51b}, {2, 0xb36bee23}, {2, 0xd17924a8}, {2, 0x6bc212d9},
--    {1, 0x630d4948}, {2, 0x9a4c4ebb}, {2, 0x554be537}, {1, 0xd63ddfc7},
--    {2, 0xa10acc11}, {1, 0x759a8363}, {2, 0xfb73090d}, {1, 0xe82c6a34},
--    {1, 0xe33e92d7}, {3, 0x658ef5cb}, {2, 0xba32ff22}, {5, 0x0227a10c},
--    {1, 0xa9a70155}, {5, 0xd096d809}, {1, 0x37176174}, {1, 0x830b8d0f},
--    {1, 0xc6e3910e}, {2, 0x823f3ca8}, {1, 0x99850849}, {1, 0x7521fb81},
--    {1, 0xaacaabab}, {1, 0xd645a2eb}, {5, 0x7aea1781}, {5, 0x9d6e4b78},
--    {1, 0x4ce90fd8}, {1, 0xabdc832d}, {6, 0x4a34f32a}, {2, 0xf2524c1c},
--    {2, 0x1bbeb08a}, {1, 0xad47f480}, {1, 0x9f026aeb}, {1, 0x15a95049},
--    {2, 0xd1cb95b2}, {2, 0xf84bbda5}, {1, 0x0fa62cd1}, {1, 0xe05f9169},
--    {1, 0x78d194a9}, {5, 0x3e38147b}, {5, 0x737ba0d4}, {1, 0x63378e10},
--    {1, 0x6d5f91cf}, {2, 0x88612eb8}, {2, 0xe9639484}, {1, 0xb7fabc9d},
--    {2, 0x19b01592}, {1, 0x5a90dd31}, {2, 0x5bd7e028}, {2, 0x94d00323},
--    {1, 0xa9b9c01a}, {1, 0x3a40de61}, {1, 0x56e7eec7}, {5, 0x859f7ef6},
--    {1, 0xfd8e5630}, {1, 0x2b0c9f7f}, {1, 0xba700e26}, {1, 0x7170a408},
--    {1, 0x70de86a8}, {1, 0x74d64cd5}, {1, 0x49e738a1}, {2, 0x6910b602},
--    {0, 0x643c565f}, {1, 0x54264b3f}, {2, 0x97ea6396}, {2, 0x55174459},
--    {2, 0x03e8779a}, {1, 0x98f34d8f}, {1, 0xc07b2b07}, {1, 0xdfe29668},
--    {1, 0x3141c7c1}, {1, 0xb3b595f4}, {1, 0x735abf08}, {5, 0x623bfbce},
--    {2, 0xd351e722}, {1, 0xf4ca48c9}, {1, 0x5b19c670}, {1, 0xa164bf0e},
--    {2, 0xbbbeb305}, {2, 0xfe1c810a},
-+{4, 2762203683},
-+{2, 365113248},
-+{1, 58045772},
-+{1, 1879353512},
-+{2, 3460563607},
-+{2, 1389355416},
-+{1, 2007444690},
-+{2, 3143462790},
-+{2, 2213743660},
-+{1, 1218919771},
-+{1, 4017999107},
-+{2, 1745471173},
-+{2, 142846780},
-+{1, 142326754},
-+{2, 553953301},
-+{2, 3757796778},
-+{1, 4002023946},
-+{2, 3124901826},
-+{1, 2802010589},
-+{1, 877077181},
-+{3, 3593029427},
-+{2, 3969866902},
-+{2, 3392125996},
-+{1, 1805972490},
-+{2, 22889779},
-+{1, 1846647676},
-+{2, 1139340052},
-+{2, 664153912},
-+{2, 3044128027},
-+{2, 3010194979},
-+{2, 3514377385},
-+{2, 1807880922},
-+{1, 1661815113},
-+{2, 2588692156},
-+{2, 1431037239},
-+{1, 3594379210},
-+{2, 2701839377},
-+{1, 1973060452},
-+{2, 4218620174},
-+{1, 3895224884},
-+{1, 3812528857},
-+{3, 1703867851},
-+{2, 3123904294},
-+{5, 36151564},
-+{1, 2846294357},
-+{5, 3499546633},
-+{1, 924279160},
-+{1, 2198572304},
-+{1, 3336802574},
-+{2, 2185182379},
-+{1, 2575632458},
-+{1, 1965161345},
-+{1, 2865408940},
-+{1, 3594887915},
-+{5, 2062161796},
-+{5, 2641251194},
-+{1, 1290342362},
-+{1, 2883355438},
-+{6, 1244984107},
-+{2, 4065479712},
-+{2, 465481866},
-+{1, 2907174016},
-+{1, 2667735788},
-+{1, 363417673},
-+{2, 3519780275},
-+{2, 4165713317},
-+{1, 262548689},
-+{1, 3764359529},
-+{1, 2027001003},
-+{5, 1043862655},
-+{5, 1937481940},
-+{1, 1664585233},
-+{1, 1834979792},
-+{2, 2288070330},
-+{2, 3915617412},
-+{1, 3086662813},
-+{2, 430970259},
-+{1, 1519443249},
-+{2, 1540874280},
-+{2, 2496660261},
-+{1, 2847522842},
-+{1, 977329763},
-+{1, 1458040519},
-+{5, 2241822454},
-+{1, 4253963824},
-+{1, 722247551},
-+{1, 3127905834},
-+{1, 1903207432},
-+{1, 1893631657},
-+{1, 1960201429},
-+{1, 1239890082},
-+{2, 1762702850},
-+{0, 1681675873},
-+{1, 1411795775},
-+{2, 2548720534},
-+{2, 1427588186},
-+{2, 65566621},
-+{1, 2566081936},
-+{1, 3229297415},
-+{1, 3756168812},
-+{1, 826394561},
-+{1, 3015022068},
-+{1, 1935326986},
-+{5, 1648098256},
-+{2, 3545360164},
-+{1, 4106897609},
-+{1, 1528415857},
-+{1, 2707734286},
-+{2, 3149837061},
-+{2, 4263280906},
-+
- };
- 
- // NOTE: These tests rely on CreateNewBlock doing its own self-validation!
diff --git a/src/alert.cpp b/src/alert.cpp
index 44f4d5eec6..e00847aadb 100644
--- a/src/alert.cpp
+++ b/src/alert.cpp
@@ -19,9 +19,6 @@ using namespace std;
 map<uint256, CAlert> mapAlerts;
 CCriticalSection cs_mapAlerts;
 
-static const char* pszMainKey = "04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284";
-static const char* pszTestKey = "04302390343f91cc401d56d68b123028bf52e5fca1939df127f63c6467cdf9c8e2c14b61104cf817d0b780da337893ecc4aaff1309e536162dabbdb45200ca2b0a";
-
 void CUnsignedAlert::SetNull()
 {
     nVersion = 1;
@@ -144,7 +141,7 @@ bool CAlert::RelayTo(CNode* pnode) const
 
 bool CAlert::CheckSignature() const
 {
-    CPubKey key(ParseHex(fTestNet ? pszTestKey : pszMainKey));
+    CPubKey key(Params().AlertKey());
     if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig))
         return error("CAlert::CheckSignature() : verify signature failed");
 
diff --git a/src/base58.h b/src/base58.h
index efe3a95ebd..630d6fe9aa 100644
--- a/src/base58.h
+++ b/src/base58.h
@@ -18,6 +18,7 @@
 #include <string>
 #include <vector>
 
+#include "chainparams.h"
 #include "bignum.h"
 #include "key.h"
 #include "script.h"
@@ -270,21 +271,13 @@ public:
 class CBitcoinAddress : public CBase58Data
 {
 public:
-    enum
-    {
-        PUBKEY_ADDRESS = 0,
-        SCRIPT_ADDRESS = 5,
-        PUBKEY_ADDRESS_TEST = 111,
-        SCRIPT_ADDRESS_TEST = 196,
-    };
-
     bool Set(const CKeyID &id) {
-        SetData(fTestNet ? PUBKEY_ADDRESS_TEST : PUBKEY_ADDRESS, &id, 20);
+        SetData(Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS), &id, 20);
         return true;
     }
 
     bool Set(const CScriptID &id) {
-        SetData(fTestNet ? SCRIPT_ADDRESS_TEST : SCRIPT_ADDRESS, &id, 20);
+        SetData(Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS), &id, 20);
         return true;
     }
 
@@ -295,32 +288,10 @@ public:
 
     bool IsValid() const
     {
-        unsigned int nExpectedSize = 20;
-        bool fExpectTestNet = false;
-        switch(nVersion)
-        {
-            case PUBKEY_ADDRESS:
-                nExpectedSize = 20; // Hash of public key
-                fExpectTestNet = false;
-                break;
-            case SCRIPT_ADDRESS:
-                nExpectedSize = 20; // Hash of CScript
-                fExpectTestNet = false;
-                break;
-
-            case PUBKEY_ADDRESS_TEST:
-                nExpectedSize = 20;
-                fExpectTestNet = true;
-                break;
-            case SCRIPT_ADDRESS_TEST:
-                nExpectedSize = 20;
-                fExpectTestNet = true;
-                break;
-
-            default:
-                return false;
-        }
-        return fExpectTestNet == fTestNet && vchData.size() == nExpectedSize;
+        bool fCorrectSize = vchData.size() == 20;
+        bool fKnownVersion = nVersion == Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS) ||
+                             nVersion == Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS);
+        return fCorrectSize && fKnownVersion;
     }
 
     CBitcoinAddress()
@@ -345,48 +316,27 @@ public:
     CTxDestination Get() const {
         if (!IsValid())
             return CNoDestination();
-        switch (nVersion) {
-        case PUBKEY_ADDRESS:
-        case PUBKEY_ADDRESS_TEST: {
-            uint160 id;
-            memcpy(&id, &vchData[0], 20);
+        uint160 id;
+        memcpy(&id, &vchData[0], 20);
+        if (nVersion == Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS))
             return CKeyID(id);
-        }
-        case SCRIPT_ADDRESS:
-        case SCRIPT_ADDRESS_TEST: {
-            uint160 id;
-            memcpy(&id, &vchData[0], 20);
+        else if (nVersion == Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS))
             return CScriptID(id);
-        }
-        }
-        return CNoDestination();
+        else
+            return CNoDestination();
     }
 
     bool GetKeyID(CKeyID &keyID) const {
-        if (!IsValid())
+        if (!IsValid() || nVersion != Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS))
             return false;
-        switch (nVersion) {
-        case PUBKEY_ADDRESS:
-        case PUBKEY_ADDRESS_TEST: {
-            uint160 id;
-            memcpy(&id, &vchData[0], 20);
-            keyID = CKeyID(id);
-            return true;
-        }
-        default: return false;
-        }
+        uint160 id;
+        memcpy(&id, &vchData[0], 20);
+        keyID = CKeyID(id);
+        return true;
     }
 
     bool IsScript() const {
-        if (!IsValid())
-            return false;
-        switch (nVersion) {
-        case SCRIPT_ADDRESS:
-        case SCRIPT_ADDRESS_TEST: {
-            return true;
-        }
-        default: return false;
-        }
+        return IsValid() && nVersion == Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS);
     }
 };
 
@@ -401,7 +351,7 @@ public:
     void SetKey(const CKey& vchSecret)
     {
         assert(vchSecret.IsValid());
-        SetData(fTestNet ? 239 : 128, vchSecret.begin(), vchSecret.size());
+        SetData(Params().Base58Prefix(CChainParams::SECRET_KEY), vchSecret.begin(), vchSecret.size());
         if (vchSecret.IsCompressed())
             vchData.push_back(1);
     }
@@ -415,20 +365,9 @@ public:
 
     bool IsValid() const
     {
-        bool fExpectTestNet = false;
-        switch(nVersion)
-        {
-            case 128:
-                break;
-
-            case 239:
-                fExpectTestNet = true;
-                break;
-
-            default:
-                return false;
-        }
-        return fExpectTestNet == fTestNet && (vchData.size() == 32 || (vchData.size() == 33 && vchData[32] == 1));
+        bool fExpectedFormat = vchData.size() == 32 || (vchData.size() == 33 && vchData[32] == 1);
+        bool fCorrectVersion = nVersion == Params().Base58Prefix(CChainParams::SECRET_KEY);
+        return fExpectedFormat && fCorrectVersion;
     }
 
     bool SetString(const char* pszSecret)
diff --git a/src/bitcoind.cpp b/src/bitcoind.cpp
index 682a214fb2..bc23cf5507 100644
--- a/src/bitcoind.cpp
+++ b/src/bitcoind.cpp
@@ -67,6 +67,10 @@ bool AppInit(int argc, char* argv[])
 
         if (fCommandLine)
         {
+            if (!SelectParamsFromCommandLine()) {
+                fprintf(stderr, "Error: invalid combination of -regtest and -testnet.\n");
+                return false;
+            }
             int ret = CommandLineRPC(argc, argv);
             exit(ret);
         }
diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index 285a88c8d8..febb475db3 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -3,6 +3,7 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include "chainparams.h"
 #include "init.h"
 #include "util.h"
 #include "sync.h"
@@ -38,11 +39,6 @@ static map<string, boost::shared_ptr<deadline_timer> > deadlineTimers;
 static ssl::context* rpc_ssl_context = NULL;
 static boost::thread_group* rpc_worker_group = NULL;
 
-static inline unsigned short GetDefaultRPCPort()
-{
-    return GetBoolArg("-testnet", false) ? 18332 : 8332;
-}
-
 Object JSONRPCError(int code, const string& message)
 {
     Object error;
@@ -724,8 +720,8 @@ static void RPCAcceptHandler(boost::shared_ptr< basic_socket_acceptor<Protocol,
 void StartRPCThreads()
 {
     strRPCUserColonPass = mapArgs["-rpcuser"] + ":" + mapArgs["-rpcpassword"];
-    if ((mapArgs["-rpcpassword"] == "") ||
-        (mapArgs["-rpcuser"] == mapArgs["-rpcpassword"]))
+    if (((mapArgs["-rpcpassword"] == "") ||
+         (mapArgs["-rpcuser"] == mapArgs["-rpcpassword"])) && Params().RequireRPCPassword())
     {
         unsigned char rand_pwd[32];
         RAND_bytes(rand_pwd, 32);
@@ -780,7 +776,7 @@ void StartRPCThreads()
     // Try a dual IPv6/IPv4 socket, falling back to separate IPv4 and IPv6 sockets
     const bool loopback = !mapArgs.count("-rpcallowip");
     asio::ip::address bindAddress = loopback ? asio::ip::address_v6::loopback() : asio::ip::address_v6::any();
-    ip::tcp::endpoint endpoint(bindAddress, GetArg("-rpcport", GetDefaultRPCPort()));
+    ip::tcp::endpoint endpoint(bindAddress, GetArg("-rpcport", Params().RPCPort()));
     boost::system::error_code v6_only_error;
     boost::shared_ptr<ip::tcp::acceptor> acceptor(new ip::tcp::acceptor(*rpc_io_service));
 
@@ -1078,7 +1074,7 @@ Object CallRPC(const string& strMethod, const Array& params)
     asio::ssl::stream<asio::ip::tcp::socket> sslStream(io_service, context);
     SSLIOStreamDevice<asio::ip::tcp> d(sslStream, fUseSSL);
     iostreams::stream< SSLIOStreamDevice<asio::ip::tcp> > stream(d);
-    if (!d.connect(GetArg("-rpcconnect", "127.0.0.1"), GetArg("-rpcport", itostr(GetDefaultRPCPort()))))
+    if (!d.connect(GetArg("-rpcconnect", "127.0.0.1"), GetArg("-rpcport", itostr(Params().RPCPort()))))
         throw runtime_error("couldn't connect to server");
 
     // HTTP basic authentication
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
new file mode 100644
index 0000000000..8859424d20
--- /dev/null
+++ b/src/chainparams.cpp
@@ -0,0 +1,286 @@
+// Copyright (c) 2010 Satoshi Nakamoto
+// Copyright (c) 2009-2012 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "assert.h"
+
+#include "chainparams.h"
+#include "main.h"
+#include "util.h"
+
+//
+// Main network
+//
+
+unsigned int pnSeed[] =
+{
+    0xe473042e, 0xb177f2ad, 0xd63f3fb2, 0xf864f736, 0x44a23ac7, 0xcf6d9650, 0xd648042e, 0x0536f447,
+    0x3c654ed0, 0x3e16a5bc, 0xa38e09b0, 0xdfae795b, 0xabfeca5b, 0x94ad7840, 0xf3b9f1c7, 0xbe70e0ad,
+    0x3bbd09b0, 0x8d0c7dd5, 0x3b2a7332, 0x1a06175e, 0x581f175e, 0xca0d2dcc, 0x0fdbc658, 0xcf591ec7,
+    0x295a12b2, 0xb4707bce, 0x68bb09b0, 0x4e735747, 0x89709553, 0x05a7814e, 0x5b8ec658, 0x402c5512,
+    0xe80d0905, 0x17681a5e, 0xc02aa748, 0x9f811741, 0x5f321cb0, 0x23e1ee47, 0xaf7f170c, 0xaa240ab0,
+    0xedea6257, 0x76106bc1, 0x2cf310cc, 0x08612acb, 0x9c682e4e, 0x8e963c6c, 0x443c795b, 0x22e246b8,
+    0xfa1f2dcc, 0x90118140, 0x3821042e, 0x33c3fd2e, 0x10046d5b, 0x40d14b3e, 0x7fb8f8ce, 0x67696550,
+    0xeeecbe58, 0x4f341745, 0x46b8fbd5, 0xc8463932, 0x6b73e862, 0x4c715932, 0x4a6785d5, 0xce3a64c2,
+    0xde9604c7, 0x9b06884f, 0x18002a45, 0xea9bc345, 0xc4f1c658, 0xe475c1c7, 0xdd3e795b, 0x9722175e,
+    0x34562f4e, 0x66c46e4e, 0x40bb1243, 0x7d9171d0, 0x17b8dbd5, 0x63cbfd2e, 0x1a08b8d8, 0x6175a73b,
+    0x228d2660, 0x8627c658, 0x9c566644, 0x38cca5bc, 0x3089de5b, 0x92e25f5d, 0xa393f73f, 0xcc92dc3e,
+    0x27487446, 0x62cbfd2e, 0x9d983b45, 0xf72a09b0, 0xf75f042e, 0x6434bb6a, 0xb29e77d8, 0x19be4fd9,
+    0x76443243, 0x9dd72645, 0x694cef43, 0x89c2efd5, 0x5f1c5058, 0x46c6e45b, 0xe1391b40, 0x77ccefd5,
+    0x472e5a6d, 0x85709553, 0xdd4f5d4c, 0x64ef5a46, 0x7f0ae502, 0xcf08d850, 0x3460042e, 0xeafa2d42,
+    0x793c9044, 0x9d094746, 0x1ab9b153, 0xbfe9a5bc, 0x34771fb0, 0xb7722e32, 0x1168964b, 0x19b06ab8,
+    0x19243b25, 0x13188045, 0xb4070905, 0x728ebb5d, 0x44f24ac8, 0xa317fead, 0x642f6a57, 0x3d951f32,
+    0x3d312e4e, 0xfac4d048, 0xefc4dd50, 0x52b9f1c7, 0xc14d3cc3, 0x0219ea44, 0x3b79d058, 0xfa217242,
+    0x39c80647, 0xfb697252, 0x1d495a42, 0x0aa81f4e, 0x58249ab8, 0xe6a8e6c3, 0x2bc4dad8, 0x85963c6c,
+    0xa4ce09b0, 0x2005f536, 0x5cc2703e, 0x1992de43, 0x74e86b4c, 0xe7085653, 0xf5e15a51, 0xb4872b60,
+    0x29e2b162, 0xa07ea053, 0x8229fd18, 0x4562ec4d, 0x8dec814e, 0x36cfa4cf, 0x96461032, 0x3c8770de,
+    0xd10a1f5f, 0x95934641, 0x97cd65d0, 0x2e35324a, 0x2566ba1f, 0x1ca1a9d1, 0xb808b8d5, 0xf9a24a5d,
+    0xafc8d431, 0xe4b8d9b2, 0x0f5321b2, 0x330bc658, 0x74b347ce, 0x972babd5, 0x044f7d4f, 0x06562f4e,
+    0x8b8d3c6c, 0x3507c658, 0xe4174e4d, 0xf1c009b0, 0x52249ab8, 0x27211772, 0xf6a9ba59, 0x7a391b40,
+    0x855dc6c0, 0x291f20b2, 0xe29bc345, 0x90963c6c, 0x0af70732, 0x4242a91f, 0x4c531d48, 0xa32df948,
+    0x627e3044, 0x65be1f54, 0x1a0cbf83, 0x6a443532, 0x8d5f1955, 0xbafa8132, 0x3534bdd5, 0xca019dd9,
+    0x8a0d9332, 0x5584e7d8, 0x7cd1f25e, 0xeabe3fb2, 0x2945d0d1, 0x46415718, 0x70d6042e, 0x99eb76d0,
+    0x9ece09b0, 0xb3777418, 0x5e5e91d9, 0x237a3ab0, 0xf512b62e, 0x45dec347, 0x59b7f862, 0x4c443b25,
+    0x3cc6484b, 0x9a8ec6d1, 0x021eea44, 0xc9483944, 0xfd567e32, 0xfd204bb2, 0xc5330bcc, 0x5202894e,
+    0xf9e309b0, 0x4cc17557, 0xdb9064ae, 0xe19e77d8, 0x25857f60, 0xeb4a15ad, 0x1f47f554, 0xea4472d9,
+    0xd20de593, 0xf5733b25, 0x11892b54, 0x5729d35f, 0xe6188cd1, 0x488b132e, 0x541c534a, 0xa8e854ae,
+    0xa255a66c, 0x33688763, 0xc6629ac6, 0xc20a6265, 0xcd92a059, 0x72029d3b, 0x4c298f5e, 0x51452e4e,
+    0xbb065058, 0x15fd2dcc, 0xf40c135e, 0x615a0bad, 0x0c6a6805, 0x4971a7ad, 0x17f2a5d5, 0xf8babf47,
+    0xb61f50ad, 0x4e1451b1, 0xf72d9252, 0x5c2abe58, 0xbd987c61, 0x084ae5cf, 0x20781fb0, 0x38b0f160,
+    0x18aac705, 0x14f86dc1, 0x5556f481, 0x0a36c144, 0xeb446e4c, 0x2c1c0d6c, 0xbd0ff860, 0x869f92db,
+    0x36c94f4c, 0x05502444, 0x148fe55b, 0xd5301e59, 0xd57a8f45, 0x110dc04a, 0x8670fc36, 0xee733b25,
+    0xca56f481, 0x2a5c3bae, 0x844b0905, 0x1e51fe53, 0x0241c244, 0x59c0614e, 0x94e70a55, 0x7312fead,
+    0xb735be44, 0xa55d0905, 0x2f63962e, 0x14a4e15b, 0x63f8f05c, 0x62d0d262, 0x3cab41ad, 0x87f1b1cb,
+    0x018da6b8, 0xb3967dd5, 0xcb56f481, 0x685ad718, 0x3b4aeeca, 0x8d106bc1, 0x51180905, 0x72660f48,
+    0x1521a243, 0x5b56f481, 0x6390e560, 0xdd61464e, 0x58353b25, 0x553fc062, 0x27c45d59, 0xacc62e4e,
+    0x0d5a1cd9, 0x7f65f442, 0xbdeef660, 0xf1bd1855, 0xf8473cae, 0x13b120b2, 0x442440d0, 0x53fd4352,
+    0xa305fc57, 0x458be84d, 0x639ce1c3, 0xebaaee47, 0x95e2c247, 0xf056f481, 0x6256f481, 0x1d87c65e,
+    0x0a453418, 0x5beb175e, 0xd64f1618, 0xc360795b, 0x2fbf5753, 0xa8c58e53, 0x651cec52, 0x9d37b043,
+    0x124a9758, 0x5242e4a9, 0x89913c6c, 0x880efe2e, 0x2f2f2f0c, 0x72b26751, 0x2896e46d, 0x80f4166c,
+    0x320d59ad, 0xc50151d0, 0x11a8aa43, 0xccf56057, 0x5fbad118, 0x4719b151, 0x2b5f4bc0, 0x4d7a4a50,
+    0xad06e047, 0x62ef5a46, 0x5aebde58, 0xdf7aa66c, 0x851acb50, 0x66b9a559, 0x3e9bb153, 0xcc512f2e,
+    0xc073b08e, 0xd519be58, 0xe981ea4d, 0x12fd50cb, 0x378739ad, 0x06683cae, 0xa22310b2, 0xc185c705,
+    0x8741b545, 0xa26c8318, 0x22d5bc43, 0x39201ec0, 0x68581e3e, 0xdc9bcf62, 0xd508cc82, 0xb149675b,
+    0x4c9609b0, 0x84feb84c, 0x08291e2e, 0xfd2253b2, 0x1fd269c1, 0xc9483932, 0x4d641fb0, 0x7d37c918,
+    0xa9de20ad, 0x77e2d655, 0x6d421b59, 0xd7668f80, 0xced09b62, 0xa9e5a5bc, 0xa4074e18, 0x60fc5ecc,
+    0x01300148, 0x68062444, 0xb4224847, 0xed3aa443, 0xb772fb43, 0x9f56f481, 0x220dfd18, 0x8e1c3d6c,
+    0xc44f09b0, 0x7df2bb73, 0xe22fb844, 0xea534242, 0xb6a755d4, 0xa036654b, 0x138ece5b, 0xda65d3c3,
+    0x955871bc, 0x792124b0, 0xfc82594c, 0x851d494b, 0x2c7aee47, 0x26af46b8, 0x1416252e, 0xa8abb944,
+    0x36c49d25, 0x674f645d, 0x363646b8, 0x9e1a2942, 0x66d0c154, 0xc6c2a545, 0x3570f2ad, 0xe7d547c7,
+    0x7d104932, 0x18cb9c18, 0x1dcfa4cf, 0xd156f481, 0x2a02b91f, 0x3eeb3fa8, 0xcac4175e, 0x34146d42,
+    0x994c4d46, 0x5666f440, 0x85d6713e, 0x5ecb296c, 0x0ea0ae46, 0x87e69f42, 0xc58409b0, 0x1f3436ae,
+    0x21dc6a57, 0x4ad1cd42, 0xfb8c1a4c, 0x52d3dab2, 0x3769894b, 0xb52f1c62, 0x3677916d, 0x82b3fe57,
+    0x493d4ac6, 0x9f963c6c, 0x5d91ff60, 0x458e0dad, 0xa49d0947, 0x491a3e18, 0x4aadcd5b, 0x0e46494b,
+    0x1d1610ad, 0x1a10af5d, 0x4956f481, 0x207a3eae, 0x77e73244, 0xfa3b8742, 0x3261fc36, 0xfcebf536,
+    0x1662e836, 0xf655f636, 0xa2dbd0ad, 0x23036693, 0x30448432, 0xa2b03463, 0x30730344, 0x8e4a6882,
+    0x0c50a1cb, 0xc8d8c06b, 0xc9cd6191, 0xf443db50, 0xa9553c50, 0x23145847, 0xc35da66c, 0x29c12a60,
+    0x55c2b447, 0x7434f75c, 0x61660640, 0xde2a7018, 0xc639494c, 0x1c306fce, 0x19b89244, 0xd29a6462,
+    0x462cd1b2, 0x29902f44, 0x2817fa53, 0x21a30905, 0x7777ae46, 0x288443a1, 0x7bee5148, 0xc2a8b043,
+    0xf5c3d35f, 0x2311ef84, 0x57de08a4, 0x6b221bb2, 0xf2625846, 0x4b9e09b0, 0xa24f880e, 0x22b11447,
+    0xb3a0c744, 0x919e77d8, 0xec8b64ae, 0xff5c8d45, 0x7b15b484, 0x32679a5f, 0xba80b62e, 0x05c25c61,
+    0x60014746, 0x5e8fb04c, 0xe67c0905, 0x4329c658, 0xac8fe555, 0xf875e647, 0x67406386, 0x35ceea18,
+    0xbb79484b, 0xd7b9fa62, 0x238209b0, 0x208a1d32, 0x9630995e, 0x039c1318, 0x6e48006c, 0x60582344,
+    0xadbb0150, 0x853fd462, 0x03772e4e, 0x652ce960, 0x49b630ad, 0x9993af43, 0x3735b34b, 0x548a07d9,
+    0x55a44aad, 0xa23d1bcc, 0xfdbb2f4e, 0x530b24a0, 0x0a44b451, 0x6827c657, 0x1f66494b, 0x4e680a47,
+    0x77e7b747, 0xa5eb3fa8, 0x6649764a, 0xd4e76c4b, 0x2c691fb0, 0xf1292e44, 0xc6d6c774, 0x85d23775,
+    0x28275f4d, 0x259ae46d, 0x02424e81, 0x5f16be58, 0xe707c658, 0x49eae5c7, 0xd5d147ad, 0x9a7abdc3,
+    0xe8ac7fc7, 0x84ec3aae, 0xc24942d0, 0x294aa318, 0x08ac3d18, 0x8894042e, 0xb24609b0, 0x9bcaab58,
+    0xc400f712, 0xd5c512b8, 0x2c02cc62, 0x25080fd8, 0xed74a847, 0x18a5ec5e, 0x9850ec6d, 0xf8909758,
+    0x7f56f481, 0x4496f23c, 0xae27784f, 0xcb7cd93e, 0x06e32860, 0x50b9a84f, 0x3660434a, 0x09161f5f,
+    0x900486bc, 0x08055459, 0xe7ec1017, 0x7e39494c, 0x4f443b25, 0x14751a8a, 0x717d03d4, 0xbd0e24d8,
+    0x054b6f56, 0x854c496c, 0xd92a454a, 0xc39bd054, 0x6093614b, 0x9dbad754, 0x5bf0604a, 0x99f22305
+};
+
+class CMainParams : public CChainParams {
+public:
+    CMainParams() {
+        // The message start string is designed to be unlikely to occur in normal data.
+        // The characters are rarely used upper ASCII, not valid as UTF-8, and produce
+        // a large 4-byte int at any alignment.
+        pchMessageStart[0] = 0xf9;
+        pchMessageStart[1] = 0xbe;
+        pchMessageStart[2] = 0xb4;
+        pchMessageStart[3] = 0xd9;
+        vAlertPubKey = ParseHex("04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284");
+        nDefaultPort = 8333;
+        nRPCPort = 8332;
+        bnProofOfWorkLimit = CBigNum(~uint256(0) >> 32);
+        nSubsidyHalvingInterval = 210000;
+
+        // Build the genesis block. Note that the output of the genesis coinbase cannot
+        // be spent as it did not originally exist in the database.
+        //
+        // CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
+        //   CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
+        //     CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
+        //     CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
+        //   vMerkleTree: 4a5e1e
+        const char* pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
+        CTransaction txNew;
+        txNew.vin.resize(1);
+        txNew.vout.resize(1);
+        txNew.vin[0].scriptSig = CScript() << 486604799 << CBigNum(4) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
+        txNew.vout[0].nValue = 50 * COIN;
+        txNew.vout[0].scriptPubKey = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
+        genesis.vtx.push_back(txNew);
+        genesis.hashPrevBlock = 0;
+        genesis.hashMerkleRoot = genesis.BuildMerkleTree();
+        genesis.nVersion = 1;
+        genesis.nTime    = 1231006505;
+        genesis.nBits    = 0x1d00ffff;
+        genesis.nNonce   = 2083236893;
+
+        hashGenesisBlock = genesis.GetHash();
+        assert(hashGenesisBlock == uint256("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"));
+        assert(genesis.hashMerkleRoot == uint256("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
+
+        vSeeds.push_back(CDNSSeedData("bitcoin.sipa.be", "seed.bitcoin.sipa.be"));
+        vSeeds.push_back(CDNSSeedData("bluematt.me", "dnsseed.bluematt.me"));
+        vSeeds.push_back(CDNSSeedData("dashjr.org", "dnsseed.bitcoin.dashjr.org"));
+        vSeeds.push_back(CDNSSeedData("xf2.org", "bitseed.xf2.org"));
+
+        base58Prefixes[PUBKEY_ADDRESS] = 0;
+        base58Prefixes[SCRIPT_ADDRESS] = 5;
+        base58Prefixes[SECRET_KEY] = 128;
+
+        // Convert the pnSeeds array into usable address objects.
+        for (unsigned int i = 0; i < ARRAYLEN(pnSeed); i++)
+        {
+            // It'll only connect to one or two seed nodes because once it connects,
+            // it'll get a pile of addresses with newer timestamps.
+            // Seed nodes are given a random 'last seen time' of between one and two
+            // weeks ago.
+            const int64 nOneWeek = 7*24*60*60;
+            struct in_addr ip;
+            memcpy(&ip, &pnSeed[i], sizeof(ip));
+            CAddress addr(CService(ip, GetDefaultPort()));
+            addr.nTime = GetTime() - GetRand(nOneWeek) - nOneWeek;
+            vFixedSeeds.push_back(addr);
+        }
+    }
+
+    virtual const CBlock& GenesisBlock() const { return genesis; }
+    virtual Network NetworkID() const { return CChainParams::MAIN; }
+
+    virtual const vector<CAddress>& FixedSeeds() const {
+        return vFixedSeeds;
+    }
+protected:
+    CBlock genesis;
+    vector<CAddress> vFixedSeeds;
+};
+static CMainParams mainParams;
+
+
+//
+// Testnet (v3)
+//
+class CTestNetParams : public CMainParams {
+public:
+    CTestNetParams() {
+        // The message start string is designed to be unlikely to occur in normal data.
+        // The characters are rarely used upper ASCII, not valid as UTF-8, and produce
+        // a large 4-byte int at any alignment.
+        pchMessageStart[0] = 0x0b;
+        pchMessageStart[1] = 0x11;
+        pchMessageStart[2] = 0x09;
+        pchMessageStart[3] = 0x07;
+        vAlertPubKey = ParseHex("04302390343f91cc401d56d68b123028bf52e5fca1939df127f63c6467cdf9c8e2c14b61104cf817d0b780da337893ecc4aaff1309e536162dabbdb45200ca2b0a");
+        nDefaultPort = 18333;
+        nRPCPort = 18332;
+        strDataDir = "testnet3";
+
+        // Modify the testnet genesis block so the timestamp is valid for a later start.
+        genesis.nTime = 1296688602;
+        genesis.nNonce = 414098458;
+        hashGenesisBlock = genesis.GetHash();
+        assert(hashGenesisBlock == uint256("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943"));
+
+        vFixedSeeds.clear();
+        vSeeds.clear();
+        vSeeds.push_back(CDNSSeedData("bitcoin.petertodd.org", "testnet-seed.bitcoin.petertodd.org"));
+        vSeeds.push_back(CDNSSeedData("bluematt.me", "testnet-seed.bluematt.me"));
+
+        base58Prefixes[PUBKEY_ADDRESS] = 111;
+        base58Prefixes[SCRIPT_ADDRESS] = 196;
+        base58Prefixes[SECRET_KEY] = 239;
+
+    }
+    virtual Network NetworkID() const { return CChainParams::TESTNET; }
+};
+static CTestNetParams testNetParams;
+
+
+//
+// Regression test
+//
+class CRegTestParams : public CTestNetParams {
+public:
+    CRegTestParams() {
+        pchMessageStart[0] = 0xfa;
+        pchMessageStart[1] = 0xbf;
+        pchMessageStart[2] = 0xb5;
+        pchMessageStart[3] = 0xda;
+        nSubsidyHalvingInterval = 150;
+        bnProofOfWorkLimit = CBigNum(~uint256(0) >> 1);
+        genesis.nTime = 1296688602;
+        genesis.nBits = 0x207fffff;
+        genesis.nNonce = 2;
+        hashGenesisBlock = genesis.GetHash();
+        nDefaultPort = 18444;
+        strDataDir = "regtest";
+        assert(hashGenesisBlock == uint256("0x0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206"));
+
+        vSeeds.clear();  // Regtest mode doesn't have any DNS seeds.
+
+        base58Prefixes[PUBKEY_ADDRESS] = 0;
+        base58Prefixes[SCRIPT_ADDRESS] = 5;
+        base58Prefixes[SECRET_KEY] = 128;
+    }
+
+    virtual bool RequireRPCPassword() const { return false; }
+    virtual Network NetworkID() const { return CChainParams::REGTEST; }
+};
+static CRegTestParams regTestParams;
+
+static CChainParams *pCurrentParams = &mainParams;
+
+const CChainParams &Params() {
+    return *pCurrentParams;
+}
+
+void SelectParams(CChainParams::Network network) {
+    switch (network) {
+        case CChainParams::MAIN:
+            pCurrentParams = &mainParams;
+            break;
+        case CChainParams::TESTNET:
+            pCurrentParams = &testNetParams;
+            break;
+        case CChainParams::REGTEST:
+            pCurrentParams = &regTestParams;
+            break;
+        default:
+            assert(false && "Unimplemented network");
+            return;
+    }
+}
+
+bool SelectParamsFromCommandLine() {
+    bool fRegTest = GetBoolArg("-regtest", false);
+    bool fTestNet = GetBoolArg("-testnet", false);
+
+    if (fTestNet && fRegTest) {
+        return false;
+    }
+
+    if (fRegTest) {
+        SelectParams(CChainParams::REGTEST);
+    } else if (fTestNet) {
+        SelectParams(CChainParams::TESTNET);
+    } else {
+        SelectParams(CChainParams::MAIN);
+    }
+    return true;
+}
diff --git a/src/chainparams.h b/src/chainparams.h
new file mode 100644
index 0000000000..572712b589
--- /dev/null
+++ b/src/chainparams.h
@@ -0,0 +1,102 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_CHAIN_PARAMS_H
+#define BITCOIN_CHAIN_PARAMS_H
+
+#include "bignum.h"
+#include "uint256.h"
+#include "util.h"
+
+#include <vector>
+
+using namespace std;
+
+#define MESSAGE_START_SIZE 4
+typedef unsigned char MessageStartChars[MESSAGE_START_SIZE];
+
+class CAddress;
+class CBlock;
+
+struct CDNSSeedData {
+    string name, host;
+    CDNSSeedData(const string &strName, const string &strHost) : name(strName), host(strHost) {}
+};
+
+/**
+ * CChainParams defines various tweakable parameters of a given instance of the
+ * Bitcoin system. There are three: the main network on which people trade goods
+ * and services, the public test network which gets reset from time to time and
+ * a regression test mode which is intended for private networks only. It has
+ * minimal difficulty to ensure that blocks can be found instantly.
+ */
+class CChainParams
+{
+public:
+    enum Network {
+        MAIN,
+        TESTNET,
+        REGTEST,
+    };
+
+    enum Base58Type {
+        PUBKEY_ADDRESS,
+        SCRIPT_ADDRESS,
+        SECRET_KEY,
+
+        MAX_BASE58_TYPES
+    };
+
+    const uint256& HashGenesisBlock() const { return hashGenesisBlock; }
+    const MessageStartChars& MessageStart() const { return pchMessageStart; }
+    const vector<unsigned char>& AlertKey() const { return vAlertPubKey; }
+    int GetDefaultPort() const { return nDefaultPort; }
+    const CBigNum& ProofOfWorkLimit() const { return bnProofOfWorkLimit; }
+    int SubsidyHalvingInterval() const { return nSubsidyHalvingInterval; }
+    virtual const CBlock& GenesisBlock() const = 0;
+    virtual bool RequireRPCPassword() const { return true; }
+    const string& DataDir() const { return strDataDir; }
+    virtual Network NetworkID() const = 0;
+    const vector<CDNSSeedData>& DNSSeeds() const { return vSeeds; }
+    int Base58Prefix(Base58Type type) const { return base58Prefixes[type]; }
+    virtual const vector<CAddress>& FixedSeeds() const = 0;
+    int RPCPort() const { return nRPCPort; }
+protected:
+    CChainParams() {};
+
+    uint256 hashGenesisBlock;
+    MessageStartChars pchMessageStart;
+    // Raw pub key bytes for the broadcast alert signing key.
+    vector<unsigned char> vAlertPubKey;
+    int nDefaultPort;
+    int nRPCPort;
+    CBigNum bnProofOfWorkLimit;
+    int nSubsidyHalvingInterval;
+    string strDataDir;
+    vector<CDNSSeedData> vSeeds;
+    int base58Prefixes[MAX_BASE58_TYPES];
+};
+
+/**
+ * Return the currently selected parameters. This won't change after app startup
+ * outside of the unit tests.
+ */
+const CChainParams &Params();
+
+/** Sets the params returned by Params() to those for the given network. */
+void SelectParams(CChainParams::Network network);
+
+/**
+ * Looks for -regtest or -testnet and then calls SelectParams as appropriate.
+ * Returns false if an invalid combination is given.
+ */
+bool SelectParamsFromCommandLine();
+
+inline bool TestNet() {
+    // Note: it's deliberate that this returns "false" for regression test mode.
+    return Params().NetworkID() == CChainParams::TESTNET;
+}
+
+#endif
diff --git a/src/checkpoints.cpp b/src/checkpoints.cpp
index 7643ec5df8..ba29e2463e 100644
--- a/src/checkpoints.cpp
+++ b/src/checkpoints.cpp
@@ -56,7 +56,7 @@ namespace Checkpoints
         60000.0     // * estimated number of transactions per day after checkpoint
     };
 
-    static MapCheckpoints mapCheckpointsTestnet = 
+    static MapCheckpoints mapCheckpointsTestnet =
         boost::assign::map_list_of
         ( 546, uint256("000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70"))
         ;
@@ -68,7 +68,7 @@ namespace Checkpoints
     };
 
     const CCheckpointData &Checkpoints() {
-        if (fTestNet)
+        if (TestNet())
             return dataTestnet;
         else
             return data;
diff --git a/src/db.cpp b/src/db.cpp
index 1f53917602..93f3f5d8c4 100644
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -3,6 +3,7 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include "chainparams.h"
 #include "db.h"
 #include "util.h"
 #include "hash.h"
@@ -488,8 +489,6 @@ void CDBEnv::Flush(bool fShutdown)
 // CAddrDB
 //
 
-unsigned char CAddrDB::pchMessageStart[4] = { 0x00, 0x00, 0x00, 0x00 };
-
 CAddrDB::CAddrDB()
 {
     pathAddr = GetDataDir() / "peers.dat";
@@ -504,7 +503,7 @@ bool CAddrDB::Write(const CAddrMan& addr)
 
     // serialize addresses, checksum data up to that point, then append csum
     CDataStream ssPeers(SER_DISK, CLIENT_VERSION);
-    ssPeers << FLATDATA(CAddrDB::pchMessageStart);
+    ssPeers << FLATDATA(Params().MessageStart());
     ssPeers << addr;
     uint256 hash = Hash(ssPeers.begin(), ssPeers.end());
     ssPeers << hash;
@@ -569,11 +568,11 @@ bool CAddrDB::Read(CAddrMan& addr)
 
     unsigned char pchMsgTmp[4];
     try {
-        // de-serialize file header (CAddrDB::pchMessageStart magic number) and
+        // de-serialize file header (network specific magic number) and ..
         ssPeers >> FLATDATA(pchMsgTmp);
 
-        // verify the network matches ours
-        if (memcmp(pchMsgTmp, CAddrDB::pchMessageStart, sizeof(pchMsgTmp)))
+        // ... verify the network matches ours
+        if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp)))
             return error("CAddrman::Read() : invalid network magic number");
 
         // de-serialize address data into one CAddrMan object
diff --git a/src/db.h b/src/db.h
index 92241f6cf2..b3f269f3da 100644
--- a/src/db.h
+++ b/src/db.h
@@ -318,14 +318,10 @@ class CAddrDB
 {
 private:
     boost::filesystem::path pathAddr;
-    static unsigned char pchMessageStart[4];
-
 public:
     CAddrDB();
     bool Write(const CAddrMan& addr);
     bool Read(CAddrMan& addr);
-
-    static void SetMessageStart(unsigned char _pchMessageStart[]) { memcpy(CAddrDB::pchMessageStart, _pchMessageStart, sizeof(CAddrDB::pchMessageStart)); }
 };
 
 #endif // BITCOIN_DB_H
diff --git a/src/init.cpp b/src/init.cpp
index fe74cd6963..4e599048ac 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -6,6 +6,7 @@
 #include "init.h"
 #include "main.h"
 #include "core.h"
+#include "chainparams.h"
 #include "txdb.h"
 #include "walletdb.h"
 #include "bitcoinrpc.h"
@@ -13,6 +14,7 @@
 #include "util.h"
 #include "ui_interface.h"
 #include "checkpoints.h"
+#include "chainparams.h"
 
 #include <boost/filesystem.hpp>
 #include <boost/filesystem/fstream.hpp>
@@ -210,6 +212,8 @@ std::string HelpMessage()
     strUsage += "  -logtimestamps         " + _("Prepend debug output with timestamp") + "\n";
     strUsage += "  -shrinkdebugfile       " + _("Shrink debug.log file on client startup (default: 1 when no -debug)") + "\n";
     strUsage += "  -printtoconsole        " + _("Send trace/debug info to console instead of debug.log file") + "\n";
+    strUsage += "  -regtest               " + _("Enter regression test mode, which uses a special chain in which blocks can be "
+                                                "solved instantly. This is intended for regression testing tools and app development.") + "\n";
 #ifdef WIN32
     strUsage += "  -printtodebugger       " + _("Send trace/debug info to debugger") + "\n";
 #endif
@@ -366,8 +370,10 @@ bool AppInit2(boost::thread_group& threadGroup)
 
     // ********************************************************* Step 2: parameter interactions
 
-    fTestNet = GetBoolArg("-testnet", false);
     Checkpoints::fEnabled = GetBoolArg("-checkpoints", true);
+    if (!SelectParamsFromCommandLine()) {
+        return InitError("Invalid combination of -testnet and -regtest.");
+    }
 
     if (mapArgs.count("-bind")) {
         // when specifying an explicit binding address, you want to listen on it
@@ -572,7 +578,7 @@ bool AppInit2(boost::thread_group& threadGroup)
     // ********************************************************* Step 6: network initialization
 
     RegisterNodeSignals(GetNodeSignals());
- 
+
     int nSocksVersion = GetArg("-socks", 5);
     if (nSocksVersion != 4 && nSocksVersion != 5)
         return InitError(strprintf(_("Unknown -socks proxy version requested: %i"), nSocksVersion));
@@ -937,7 +943,6 @@ bool AppInit2(boost::thread_group& threadGroup)
     nStart = GetTimeMillis();
 
     {
-        CAddrDB::SetMessageStart(pchMessageStart);
         CAddrDB adb;
         if (!adb.Read(addrman))
             printf("Invalid or missing peers.dat; recreating\n");
diff --git a/src/main.cpp b/src/main.cpp
index 8d53e3be43..975e0f6e6c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -11,6 +11,7 @@
 #include "init.h"
 #include "ui_interface.h"
 #include "checkqueue.h"
+#include "chainparams.h"
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/filesystem/fstream.hpp>
@@ -32,8 +33,6 @@ unsigned int nTransactionsUpdated = 0;
 
 map<uint256, CBlockIndex*> mapBlockIndex;
 std::vector<CBlockIndex*> vBlockIndexByHeight;
-uint256 hashGenesisBlock("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f");
-static CBigNum bnProofOfWorkLimit(~uint256(0) >> 32);
 CBlockIndex* pindexGenesisBlock = NULL;
 int nBestHeight = -1;
 uint256 nBestChainWork = 0;
@@ -201,7 +200,7 @@ void CBlockLocator::Set(const CBlockIndex* pindex)
         if (vHave.size() > 10)
             nStep *= 2;
     }
-    vHave.push_back(hashGenesisBlock);
+    vHave.push_back(Params().HashGenesisBlock());
 }
 
 int CBlockLocator::GetDistanceBack()
@@ -254,7 +253,7 @@ uint256 CBlockLocator::GetBlockHash()
                 return hash;
         }
     }
-    return hashGenesisBlock;
+    return Params().HashGenesisBlock();
 }
 
 int CBlockLocator::GetHeight()
@@ -798,7 +797,7 @@ bool CTxMemPool::accept(CValidationState &state, CTransaction &tx, bool fLimitFr
         return error("CTxMemPool::accept() : not accepting nLockTime beyond 2038 yet");
 
     // Rather not work on nonstandard transactions (unless -testnet)
-    if (!fTestNet && !IsStandardTx(tx))
+    if (!TestNet() && !IsStandardTx(tx))
         return error("CTxMemPool::accept() : nonstandard transaction type");
 
     // is it already in the memory pool?
@@ -873,7 +872,7 @@ bool CTxMemPool::accept(CValidationState &state, CTransaction &tx, bool fLimitFr
         }
 
         // Check for non-standard pay-to-script-hash in inputs
-        if (!AreInputsStandard(tx, view) && !fTestNet)
+        if (!TestNet() && !AreInputsStandard(tx, view))
             return error("CTxMemPool::accept() : nonstandard transaction input");
 
         // Note: if you modify this code to accept non-standard transactions, then
@@ -1183,8 +1182,8 @@ int64 static GetBlockValue(int nHeight, int64 nFees)
 {
     int64 nSubsidy = 50 * COIN;
 
-    // Subsidy is cut in half every 210000 blocks, which will occur approximately every 4 years
-    nSubsidy >>= (nHeight / 210000);
+    // Subsidy is cut in half every 210,000 blocks which will occur approximately every 4 years.
+    nSubsidy >>= (nHeight / Params().SubsidyHalvingInterval());
 
     return nSubsidy + nFees;
 }
@@ -1199,28 +1198,29 @@ static const int64 nInterval = nTargetTimespan / nTargetSpacing;
 //
 unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
 {
+    const CBigNum &bnLimit = Params().ProofOfWorkLimit();
     // Testnet has min-difficulty blocks
     // after nTargetSpacing*2 time between blocks:
-    if (fTestNet && nTime > nTargetSpacing*2)
-        return bnProofOfWorkLimit.GetCompact();
+    if (TestNet() && nTime > nTargetSpacing*2)
+        return bnLimit.GetCompact();
 
     CBigNum bnResult;
     bnResult.SetCompact(nBase);
-    while (nTime > 0 && bnResult < bnProofOfWorkLimit)
+    while (nTime > 0 && bnResult < bnLimit)
     {
         // Maximum 400% adjustment...
         bnResult *= 4;
         // ... in best-case exactly 4-times-normal target time
         nTime -= nTargetTimespan*4;
     }
-    if (bnResult > bnProofOfWorkLimit)
-        bnResult = bnProofOfWorkLimit;
+    if (bnResult > bnLimit)
+        bnResult = bnLimit;
     return bnResult.GetCompact();
 }
 
 unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock)
 {
-    unsigned int nProofOfWorkLimit = bnProofOfWorkLimit.GetCompact();
+    unsigned int nProofOfWorkLimit = Params().ProofOfWorkLimit().GetCompact();
 
     // Genesis block
     if (pindexLast == NULL)
@@ -1229,9 +1229,9 @@ unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBl
     // Only change once per interval
     if ((pindexLast->nHeight+1) % nInterval != 0)
     {
-        // Special difficulty rule for testnet:
-        if (fTestNet)
+        if (TestNet())
         {
+            // Special difficulty rule for testnet:
             // 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)
@@ -1245,7 +1245,6 @@ unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBl
                 return pindex->nBits;
             }
         }
-
         return pindexLast->nBits;
     }
 
@@ -1269,8 +1268,8 @@ unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBl
     bnNew *= nActualTimespan;
     bnNew /= nTargetTimespan;
 
-    if (bnNew > bnProofOfWorkLimit)
-        bnNew = bnProofOfWorkLimit;
+    if (bnNew > Params().ProofOfWorkLimit())
+        bnNew = Params().ProofOfWorkLimit();
 
     /// debug print
     printf("GetNextWorkRequired RETARGET\n");
@@ -1287,7 +1286,7 @@ bool CheckProofOfWork(uint256 hash, unsigned int nBits)
     bnTarget.SetCompact(nBits);
 
     // Check range
-    if (bnTarget <= 0 || bnTarget > bnProofOfWorkLimit)
+    if (bnTarget <= 0 || bnTarget > Params().ProofOfWorkLimit())
         return error("CheckProofOfWork() : nBits below minimum work");
 
     // Check proof of work matches claimed amount
@@ -1405,7 +1404,7 @@ void UpdateTime(CBlockHeader& block, const CBlockIndex* pindexPrev)
     block.nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
 
     // Updating time can change work required on testnet:
-    if (fTestNet)
+    if (TestNet())
         block.nBits = GetNextWorkRequired(pindexPrev, &block);
 }
 
@@ -1694,7 +1693,7 @@ bool CBlock::ConnectBlock(CValidationState &state, CBlockIndex* pindex, CCoinsVi
 
     // Special case for the genesis block, skipping connection of its transactions
     // (its coinbase is unspendable)
-    if (GetHash() == hashGenesisBlock) {
+    if (GetHash() == Params().HashGenesisBlock()) {
         view.SetBestBlock(pindex);
         pindexGenesisBlock = pindex;
         return true;
@@ -2222,7 +2221,7 @@ bool CBlock::AcceptBlock(CValidationState &state, CDiskBlockPos *dbp)
     // Get prev block index
     CBlockIndex* pindexPrev = NULL;
     int nHeight = 0;
-    if (hash != hashGenesisBlock) {
+    if (hash != Params().HashGenesisBlock()) {
         map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashPrevBlock);
         if (mi == mapBlockIndex.end())
             return state.DoS(10, error("AcceptBlock() : prev block not found"));
@@ -2249,8 +2248,8 @@ bool CBlock::AcceptBlock(CValidationState &state, CDiskBlockPos *dbp)
         // Reject block.nVersion=1 blocks when 95% (75% on testnet) of the network has upgraded:
         if (nVersion < 2)
         {
-            if ((!fTestNet && CBlockIndex::IsSuperMajority(2, pindexPrev, 950, 1000)) ||
-                (fTestNet && CBlockIndex::IsSuperMajority(2, pindexPrev, 75, 100)))
+            if ((!TestNet() && CBlockIndex::IsSuperMajority(2, pindexPrev, 950, 1000)) ||
+                (TestNet() && CBlockIndex::IsSuperMajority(2, pindexPrev, 75, 100)))
             {
                 return state.Invalid(error("AcceptBlock() : rejected nVersion=1 block"));
             }
@@ -2259,8 +2258,8 @@ bool CBlock::AcceptBlock(CValidationState &state, CDiskBlockPos *dbp)
         if (nVersion >= 2)
         {
             // if 750 of the last 1,000 blocks are version 2 or greater (51/100 if testnet):
-            if ((!fTestNet && CBlockIndex::IsSuperMajority(2, pindexPrev, 750, 1000)) ||
-                (fTestNet && CBlockIndex::IsSuperMajority(2, pindexPrev, 51, 100)))
+            if ((!TestNet() && CBlockIndex::IsSuperMajority(2, pindexPrev, 750, 1000)) ||
+                (TestNet() && CBlockIndex::IsSuperMajority(2, pindexPrev, 51, 100)))
             {
                 CScript expect = CScript() << nHeight;
                 if (!std::equal(expect.begin(), expect.end(), vtx[0].vin[0].scriptSig.begin()))
@@ -2790,21 +2789,9 @@ void UnloadBlockIndex()
 
 bool LoadBlockIndex()
 {
-    if (fTestNet)
-    {
-        pchMessageStart[0] = 0x0b;
-        pchMessageStart[1] = 0x11;
-        pchMessageStart[2] = 0x09;
-        pchMessageStart[3] = 0x07;
-        hashGenesisBlock = uint256("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943");
-    }
-
-    //
     // Load block index from databases
-    //
     if (!fReindex && !LoadBlockIndexDB())
         return false;
-
     return true;
 }
 
@@ -2821,47 +2808,9 @@ bool InitBlockIndex() {
 
     // Only add the genesis block if not reindexing (in which case we reuse the one already on disk)
     if (!fReindex) {
-        // Genesis Block:
-        // CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
-        //   CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
-        //     CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
-        //     CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
-        //   vMerkleTree: 4a5e1e
-
-        // Genesis block
-        const char* pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
-        CTransaction txNew;
-        txNew.vin.resize(1);
-        txNew.vout.resize(1);
-        txNew.vin[0].scriptSig = CScript() << 486604799 << CBigNum(4) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
-        txNew.vout[0].nValue = 50 * COIN;
-        txNew.vout[0].scriptPubKey = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
-        CBlock block;
-        block.vtx.push_back(txNew);
-        block.hashPrevBlock = 0;
-        block.hashMerkleRoot = block.BuildMerkleTree();
-        block.nVersion = 1;
-        block.nTime    = 1231006505;
-        block.nBits    = 0x1d00ffff;
-        block.nNonce   = 2083236893;
-
-        if (fTestNet)
-        {
-            block.nTime    = 1296688602;
-            block.nNonce   = 414098458;
-        }
-
-        //// debug print
-        uint256 hash = block.GetHash();
-        printf("%s\n", hash.ToString().c_str());
-        printf("%s\n", hashGenesisBlock.ToString().c_str());
-        printf("%s\n", block.hashMerkleRoot.ToString().c_str());
-        assert(block.hashMerkleRoot == uint256("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
-        block.print();
-        assert(hash == hashGenesisBlock);
-
-        // Start new block file
         try {
+            CBlock &block = const_cast<CBlock&>(Params().GenesisBlock());
+            // Start new block file
             unsigned int nBlockSize = ::GetSerializeSize(block, SER_DISK, CLIENT_VERSION);
             CDiskBlockPos blockPos;
             CValidationState state;
@@ -2978,10 +2927,10 @@ bool LoadExternalBlockFile(FILE* fileIn, CDiskBlockPos *dbp)
             try {
                 // locate a header
                 unsigned char buf[4];
-                blkdat.FindByte(pchMessageStart[0]);
+                blkdat.FindByte(Params().MessageStart()[0]);
                 nRewind = blkdat.GetPos()+1;
                 blkdat >> FLATDATA(buf);
-                if (memcmp(buf, pchMessageStart, 4))
+                if (memcmp(buf, Params().MessageStart(), 4))
                     continue;
                 // read size
                 blkdat >> nSize;
@@ -3126,12 +3075,6 @@ bool static AlreadyHave(const CInv& inv)
 
 
 
-// The message start string is designed to be unlikely to occur in normal data.
-// The characters are rarely used upper ASCII, not valid as UTF-8, and produce
-// a large 4-byte int at any alignment.
-unsigned char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
-
-
 void static ProcessGetData(CNode* pfrom)
 {
     std::deque<CInv>::iterator it = pfrom->vRecvGetData.begin();
@@ -3854,7 +3797,7 @@ bool ProcessMessages(CNode* pfrom)
         it++;
 
         // Scan for message start
-        if (memcmp(msg.hdr.pchMessageStart, pchMessageStart, sizeof(pchMessageStart)) != 0) {
+        if (memcmp(msg.hdr.pchMessageStart, Params().MessageStart(), MESSAGE_START_SIZE) != 0) {
             printf("\n\nPROCESSMESSAGE: INVALID MESSAGESTART\n\n");
             fOk = false;
             break;
@@ -4598,8 +4541,12 @@ void static BitcoinMiner(CWallet *pwallet)
     unsigned int nExtraNonce = 0;
 
     try { loop {
-        while (vNodes.empty())
-            MilliSleep(1000);
+        if (Params().NetworkID() != CChainParams::REGTEST) {
+            // Busy-wait for the network to come online so we don't waste time mining
+            // on an obsolete chain. In regtest mode we expect to fly solo.
+            while (vNodes.empty())
+                MilliSleep(1000);
+        }
 
         //
         // Create new block
@@ -4661,6 +4608,12 @@ void static BitcoinMiner(CWallet *pwallet)
                     SetThreadPriority(THREAD_PRIORITY_NORMAL);
                     CheckWork(pblock, *pwalletMain, reservekey);
                     SetThreadPriority(THREAD_PRIORITY_LOWEST);
+
+                    // In regression test mode, stop mining after a block is found. This
+                    // allows developers to controllably generate a block on demand.
+                    if (Params().NetworkID() == CChainParams::REGTEST)
+                        throw boost::thread_interrupted();
+
                     break;
                 }
             }
@@ -4696,7 +4649,7 @@ void static BitcoinMiner(CWallet *pwallet)
 
             // Check for stop or if block needs to be rebuilt
             boost::this_thread::interruption_point();
-            if (vNodes.empty())
+            if (vNodes.empty() && Params().NetworkID() != CChainParams::REGTEST)
                 break;
             if (nBlockNonce >= 0xffff0000)
                 break;
@@ -4708,7 +4661,7 @@ void static BitcoinMiner(CWallet *pwallet)
             // Update nTime every few seconds
             UpdateTime(*pblock, pindexPrev);
             nBlockTime = ByteReverse(pblock->nTime);
-            if (fTestNet)
+            if (TestNet())
             {
                 // Changing pblock->nTime can change work required on testnet:
                 nBlockBits = ByteReverse(pblock->nBits);
@@ -4728,8 +4681,12 @@ void GenerateBitcoins(bool fGenerate, CWallet* pwallet)
     static boost::thread_group* minerThreads = NULL;
 
     int nThreads = GetArg("-genproclimit", -1);
-    if (nThreads < 0)
-        nThreads = boost::thread::hardware_concurrency();
+    if (nThreads < 0) {
+        if (Params().NetworkID() == CChainParams::REGTEST)
+            nThreads = 1;
+        else
+            nThreads = boost::thread::hardware_concurrency();
+    }
 
     if (minerThreads != NULL)
     {
diff --git a/src/main.h b/src/main.h
index 615a3b3ec4..ec89d8bdd3 100644
--- a/src/main.h
+++ b/src/main.h
@@ -70,7 +70,6 @@ extern CCriticalSection cs_main;
 extern std::map<uint256, CBlockIndex*> mapBlockIndex;
 extern std::vector<CBlockIndex*> vBlockIndexByHeight;
 extern std::set<CBlockIndex*, CBlockIndexWorkComparator> setBlockIndexValid;
-extern uint256 hashGenesisBlock;
 extern CBlockIndex* pindexGenesisBlock;
 extern int nBestHeight;
 extern uint256 nBestChainWork;
@@ -86,7 +85,6 @@ extern int64 nHPSTimerStart;
 extern int64 nTimeBestReceived;
 extern CCriticalSection cs_setpwalletRegistered;
 extern std::set<CWallet*> setpwalletRegistered;
-extern unsigned char pchMessageStart[4];
 extern bool fImporting;
 extern bool fReindex;
 extern bool fBenchmark;
@@ -353,7 +351,7 @@ public:
 
         // Write index header
         unsigned int nSize = fileout.GetSerializeSize(*this);
-        fileout << FLATDATA(pchMessageStart) << nSize;
+        fileout << FLATDATA(Params().MessageStart()) << nSize;
 
         // Write undo data
         long fileOutPos = ftell(fileout);
@@ -692,7 +690,7 @@ public:
 
         // Write index header
         unsigned int nSize = fileout.GetSerializeSize(*this);
-        fileout << FLATDATA(pchMessageStart) << nSize;
+        fileout << FLATDATA(Params().MessageStart()) << nSize;
 
         // Write block
         long fileOutPos = ftell(fileout);
diff --git a/src/makefile.unix b/src/makefile.unix
index a83bab1047..f17de05cb9 100644
--- a/src/makefile.unix
+++ b/src/makefile.unix
@@ -143,7 +143,8 @@ OBJS= \
     obj/bloom.o \
     obj/noui.o \
     obj/leveldb.o \
-    obj/txdb.o
+    obj/txdb.o \
+    obj/chainparams.o
 
 
 all: bitcoind
diff --git a/src/net.cpp b/src/net.cpp
index 1d181823e2..0adf26ef0d 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -3,6 +3,7 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include "chainparams.h"
 #include "db.h"
 #include "net.h"
 #include "core.h"
@@ -80,7 +81,7 @@ void AddOneShot(string strDest)
 
 unsigned short GetListenPort()
 {
-    return (unsigned short)(GetArg("-port", GetDefaultPort()));
+    return (unsigned short)(GetArg("-port", Params().GetDefaultPort()));
 }
 
 // find 'best' local address for a particular peer
@@ -464,7 +465,7 @@ CNode* ConnectNode(CAddress addrConnect, const char *pszDest)
 
     // Connect
     SOCKET hSocket;
-    if (pszDest ? ConnectSocketByName(addrConnect, hSocket, pszDest, GetDefaultPort()) : ConnectSocket(addrConnect, hSocket))
+    if (pszDest ? ConnectSocketByName(addrConnect, hSocket, pszDest, Params().GetDefaultPort()) : ConnectSocket(addrConnect, hSocket))
     {
         addrman.Attempt(addrConnect);
 
@@ -1170,53 +1171,31 @@ void MapPort(bool)
 
 
 
-
-
-
-// DNS seeds
-// Each pair gives a source name and a seed name.
-// The first name is used as information source for addrman.
-// The second name should resolve to a list of seed addresses.
-static const char *strMainNetDNSSeed[][2] = {
-    {"bitcoin.sipa.be", "seed.bitcoin.sipa.be"},
-    {"bluematt.me", "dnsseed.bluematt.me"},
-    {"dashjr.org", "dnsseed.bitcoin.dashjr.org"},
-    {"xf2.org", "bitseed.xf2.org"},
-    {NULL, NULL}
-};
-
-static const char *strTestNetDNSSeed[][2] = {
-    {"bitcoin.petertodd.org", "testnet-seed.bitcoin.petertodd.org"},
-    {"bluematt.me", "testnet-seed.bluematt.me"},
-    {NULL, NULL}
-};
-
 void ThreadDNSAddressSeed()
 {
-    static const char *(*strDNSSeed)[2] = fTestNet ? strTestNetDNSSeed : strMainNetDNSSeed;
-
+    const vector<CDNSSeedData> &vSeeds = Params().DNSSeeds();
     int found = 0;
 
     printf("Loading addresses from DNS seeds (could take a while)\n");
 
-    for (unsigned int seed_idx = 0; strDNSSeed[seed_idx][0] != NULL; seed_idx++) {
+    BOOST_FOREACH(const CDNSSeedData &seed, vSeeds) {
         if (HaveNameProxy()) {
-            AddOneShot(strDNSSeed[seed_idx][1]);
+            AddOneShot(seed.host);
         } else {
-            vector<CNetAddr> vaddr;
+            vector<CNetAddr> vIPs;
             vector<CAddress> vAdd;
-            if (LookupHost(strDNSSeed[seed_idx][1], vaddr))
+            if (LookupHost(seed.host.c_str(), vIPs))
             {
-                BOOST_FOREACH(CNetAddr& ip, vaddr)
+                BOOST_FOREACH(CNetAddr& ip, vIPs)
                 {
                     int nOneDay = 24*3600;
-                    CAddress addr = CAddress(CService(ip, GetDefaultPort()));
+                    CAddress addr = CAddress(CService(ip, Params().GetDefaultPort()));
                     addr.nTime = GetTime() - 3*nOneDay - GetRand(4*nOneDay); // use a random age between 3 and 7 days old
                     vAdd.push_back(addr);
                     found++;
                 }
             }
-            addrman.Add(vAdd, CNetAddr(strDNSSeed[seed_idx][0], true));
+            addrman.Add(vAdd, CNetAddr(seed.name, true));
         }
     }
 
@@ -1234,85 +1213,6 @@ void ThreadDNSAddressSeed()
 
 
 
-unsigned int pnSeed[] =
-{
-    0xe473042e, 0xb177f2ad, 0xd63f3fb2, 0xf864f736, 0x44a23ac7, 0xcf6d9650, 0xd648042e, 0x0536f447,
-    0x3c654ed0, 0x3e16a5bc, 0xa38e09b0, 0xdfae795b, 0xabfeca5b, 0x94ad7840, 0xf3b9f1c7, 0xbe70e0ad,
-    0x3bbd09b0, 0x8d0c7dd5, 0x3b2a7332, 0x1a06175e, 0x581f175e, 0xca0d2dcc, 0x0fdbc658, 0xcf591ec7,
-    0x295a12b2, 0xb4707bce, 0x68bb09b0, 0x4e735747, 0x89709553, 0x05a7814e, 0x5b8ec658, 0x402c5512,
-    0xe80d0905, 0x17681a5e, 0xc02aa748, 0x9f811741, 0x5f321cb0, 0x23e1ee47, 0xaf7f170c, 0xaa240ab0,
-    0xedea6257, 0x76106bc1, 0x2cf310cc, 0x08612acb, 0x9c682e4e, 0x8e963c6c, 0x443c795b, 0x22e246b8,
-    0xfa1f2dcc, 0x90118140, 0x3821042e, 0x33c3fd2e, 0x10046d5b, 0x40d14b3e, 0x7fb8f8ce, 0x67696550,
-    0xeeecbe58, 0x4f341745, 0x46b8fbd5, 0xc8463932, 0x6b73e862, 0x4c715932, 0x4a6785d5, 0xce3a64c2,
-    0xde9604c7, 0x9b06884f, 0x18002a45, 0xea9bc345, 0xc4f1c658, 0xe475c1c7, 0xdd3e795b, 0x9722175e,
-    0x34562f4e, 0x66c46e4e, 0x40bb1243, 0x7d9171d0, 0x17b8dbd5, 0x63cbfd2e, 0x1a08b8d8, 0x6175a73b,
-    0x228d2660, 0x8627c658, 0x9c566644, 0x38cca5bc, 0x3089de5b, 0x92e25f5d, 0xa393f73f, 0xcc92dc3e,
-    0x27487446, 0x62cbfd2e, 0x9d983b45, 0xf72a09b0, 0xf75f042e, 0x6434bb6a, 0xb29e77d8, 0x19be4fd9,
-    0x76443243, 0x9dd72645, 0x694cef43, 0x89c2efd5, 0x5f1c5058, 0x46c6e45b, 0xe1391b40, 0x77ccefd5,
-    0x472e5a6d, 0x85709553, 0xdd4f5d4c, 0x64ef5a46, 0x7f0ae502, 0xcf08d850, 0x3460042e, 0xeafa2d42,
-    0x793c9044, 0x9d094746, 0x1ab9b153, 0xbfe9a5bc, 0x34771fb0, 0xb7722e32, 0x1168964b, 0x19b06ab8,
-    0x19243b25, 0x13188045, 0xb4070905, 0x728ebb5d, 0x44f24ac8, 0xa317fead, 0x642f6a57, 0x3d951f32,
-    0x3d312e4e, 0xfac4d048, 0xefc4dd50, 0x52b9f1c7, 0xc14d3cc3, 0x0219ea44, 0x3b79d058, 0xfa217242,
-    0x39c80647, 0xfb697252, 0x1d495a42, 0x0aa81f4e, 0x58249ab8, 0xe6a8e6c3, 0x2bc4dad8, 0x85963c6c,
-    0xa4ce09b0, 0x2005f536, 0x5cc2703e, 0x1992de43, 0x74e86b4c, 0xe7085653, 0xf5e15a51, 0xb4872b60,
-    0x29e2b162, 0xa07ea053, 0x8229fd18, 0x4562ec4d, 0x8dec814e, 0x36cfa4cf, 0x96461032, 0x3c8770de,
-    0xd10a1f5f, 0x95934641, 0x97cd65d0, 0x2e35324a, 0x2566ba1f, 0x1ca1a9d1, 0xb808b8d5, 0xf9a24a5d,
-    0xafc8d431, 0xe4b8d9b2, 0x0f5321b2, 0x330bc658, 0x74b347ce, 0x972babd5, 0x044f7d4f, 0x06562f4e,
-    0x8b8d3c6c, 0x3507c658, 0xe4174e4d, 0xf1c009b0, 0x52249ab8, 0x27211772, 0xf6a9ba59, 0x7a391b40,
-    0x855dc6c0, 0x291f20b2, 0xe29bc345, 0x90963c6c, 0x0af70732, 0x4242a91f, 0x4c531d48, 0xa32df948,
-    0x627e3044, 0x65be1f54, 0x1a0cbf83, 0x6a443532, 0x8d5f1955, 0xbafa8132, 0x3534bdd5, 0xca019dd9,
-    0x8a0d9332, 0x5584e7d8, 0x7cd1f25e, 0xeabe3fb2, 0x2945d0d1, 0x46415718, 0x70d6042e, 0x99eb76d0,
-    0x9ece09b0, 0xb3777418, 0x5e5e91d9, 0x237a3ab0, 0xf512b62e, 0x45dec347, 0x59b7f862, 0x4c443b25,
-    0x3cc6484b, 0x9a8ec6d1, 0x021eea44, 0xc9483944, 0xfd567e32, 0xfd204bb2, 0xc5330bcc, 0x5202894e,
-    0xf9e309b0, 0x4cc17557, 0xdb9064ae, 0xe19e77d8, 0x25857f60, 0xeb4a15ad, 0x1f47f554, 0xea4472d9,
-    0xd20de593, 0xf5733b25, 0x11892b54, 0x5729d35f, 0xe6188cd1, 0x488b132e, 0x541c534a, 0xa8e854ae,
-    0xa255a66c, 0x33688763, 0xc6629ac6, 0xc20a6265, 0xcd92a059, 0x72029d3b, 0x4c298f5e, 0x51452e4e,
-    0xbb065058, 0x15fd2dcc, 0xf40c135e, 0x615a0bad, 0x0c6a6805, 0x4971a7ad, 0x17f2a5d5, 0xf8babf47,
-    0xb61f50ad, 0x4e1451b1, 0xf72d9252, 0x5c2abe58, 0xbd987c61, 0x084ae5cf, 0x20781fb0, 0x38b0f160,
-    0x18aac705, 0x14f86dc1, 0x5556f481, 0x0a36c144, 0xeb446e4c, 0x2c1c0d6c, 0xbd0ff860, 0x869f92db,
-    0x36c94f4c, 0x05502444, 0x148fe55b, 0xd5301e59, 0xd57a8f45, 0x110dc04a, 0x8670fc36, 0xee733b25,
-    0xca56f481, 0x2a5c3bae, 0x844b0905, 0x1e51fe53, 0x0241c244, 0x59c0614e, 0x94e70a55, 0x7312fead,
-    0xb735be44, 0xa55d0905, 0x2f63962e, 0x14a4e15b, 0x63f8f05c, 0x62d0d262, 0x3cab41ad, 0x87f1b1cb,
-    0x018da6b8, 0xb3967dd5, 0xcb56f481, 0x685ad718, 0x3b4aeeca, 0x8d106bc1, 0x51180905, 0x72660f48,
-    0x1521a243, 0x5b56f481, 0x6390e560, 0xdd61464e, 0x58353b25, 0x553fc062, 0x27c45d59, 0xacc62e4e,
-    0x0d5a1cd9, 0x7f65f442, 0xbdeef660, 0xf1bd1855, 0xf8473cae, 0x13b120b2, 0x442440d0, 0x53fd4352,
-    0xa305fc57, 0x458be84d, 0x639ce1c3, 0xebaaee47, 0x95e2c247, 0xf056f481, 0x6256f481, 0x1d87c65e,
-    0x0a453418, 0x5beb175e, 0xd64f1618, 0xc360795b, 0x2fbf5753, 0xa8c58e53, 0x651cec52, 0x9d37b043,
-    0x124a9758, 0x5242e4a9, 0x89913c6c, 0x880efe2e, 0x2f2f2f0c, 0x72b26751, 0x2896e46d, 0x80f4166c,
-    0x320d59ad, 0xc50151d0, 0x11a8aa43, 0xccf56057, 0x5fbad118, 0x4719b151, 0x2b5f4bc0, 0x4d7a4a50,
-    0xad06e047, 0x62ef5a46, 0x5aebde58, 0xdf7aa66c, 0x851acb50, 0x66b9a559, 0x3e9bb153, 0xcc512f2e,
-    0xc073b08e, 0xd519be58, 0xe981ea4d, 0x12fd50cb, 0x378739ad, 0x06683cae, 0xa22310b2, 0xc185c705,
-    0x8741b545, 0xa26c8318, 0x22d5bc43, 0x39201ec0, 0x68581e3e, 0xdc9bcf62, 0xd508cc82, 0xb149675b,
-    0x4c9609b0, 0x84feb84c, 0x08291e2e, 0xfd2253b2, 0x1fd269c1, 0xc9483932, 0x4d641fb0, 0x7d37c918,
-    0xa9de20ad, 0x77e2d655, 0x6d421b59, 0xd7668f80, 0xced09b62, 0xa9e5a5bc, 0xa4074e18, 0x60fc5ecc,
-    0x01300148, 0x68062444, 0xb4224847, 0xed3aa443, 0xb772fb43, 0x9f56f481, 0x220dfd18, 0x8e1c3d6c,
-    0xc44f09b0, 0x7df2bb73, 0xe22fb844, 0xea534242, 0xb6a755d4, 0xa036654b, 0x138ece5b, 0xda65d3c3,
-    0x955871bc, 0x792124b0, 0xfc82594c, 0x851d494b, 0x2c7aee47, 0x26af46b8, 0x1416252e, 0xa8abb944,
-    0x36c49d25, 0x674f645d, 0x363646b8, 0x9e1a2942, 0x66d0c154, 0xc6c2a545, 0x3570f2ad, 0xe7d547c7,
-    0x7d104932, 0x18cb9c18, 0x1dcfa4cf, 0xd156f481, 0x2a02b91f, 0x3eeb3fa8, 0xcac4175e, 0x34146d42,
-    0x994c4d46, 0x5666f440, 0x85d6713e, 0x5ecb296c, 0x0ea0ae46, 0x87e69f42, 0xc58409b0, 0x1f3436ae,
-    0x21dc6a57, 0x4ad1cd42, 0xfb8c1a4c, 0x52d3dab2, 0x3769894b, 0xb52f1c62, 0x3677916d, 0x82b3fe57,
-    0x493d4ac6, 0x9f963c6c, 0x5d91ff60, 0x458e0dad, 0xa49d0947, 0x491a3e18, 0x4aadcd5b, 0x0e46494b,
-    0x1d1610ad, 0x1a10af5d, 0x4956f481, 0x207a3eae, 0x77e73244, 0xfa3b8742, 0x3261fc36, 0xfcebf536,
-    0x1662e836, 0xf655f636, 0xa2dbd0ad, 0x23036693, 0x30448432, 0xa2b03463, 0x30730344, 0x8e4a6882,
-    0x0c50a1cb, 0xc8d8c06b, 0xc9cd6191, 0xf443db50, 0xa9553c50, 0x23145847, 0xc35da66c, 0x29c12a60,
-    0x55c2b447, 0x7434f75c, 0x61660640, 0xde2a7018, 0xc639494c, 0x1c306fce, 0x19b89244, 0xd29a6462,
-    0x462cd1b2, 0x29902f44, 0x2817fa53, 0x21a30905, 0x7777ae46, 0x288443a1, 0x7bee5148, 0xc2a8b043,
-    0xf5c3d35f, 0x2311ef84, 0x57de08a4, 0x6b221bb2, 0xf2625846, 0x4b9e09b0, 0xa24f880e, 0x22b11447,
-    0xb3a0c744, 0x919e77d8, 0xec8b64ae, 0xff5c8d45, 0x7b15b484, 0x32679a5f, 0xba80b62e, 0x05c25c61,
-    0x60014746, 0x5e8fb04c, 0xe67c0905, 0x4329c658, 0xac8fe555, 0xf875e647, 0x67406386, 0x35ceea18,
-    0xbb79484b, 0xd7b9fa62, 0x238209b0, 0x208a1d32, 0x9630995e, 0x039c1318, 0x6e48006c, 0x60582344,
-    0xadbb0150, 0x853fd462, 0x03772e4e, 0x652ce960, 0x49b630ad, 0x9993af43, 0x3735b34b, 0x548a07d9,
-    0x55a44aad, 0xa23d1bcc, 0xfdbb2f4e, 0x530b24a0, 0x0a44b451, 0x6827c657, 0x1f66494b, 0x4e680a47,
-    0x77e7b747, 0xa5eb3fa8, 0x6649764a, 0xd4e76c4b, 0x2c691fb0, 0xf1292e44, 0xc6d6c774, 0x85d23775,
-    0x28275f4d, 0x259ae46d, 0x02424e81, 0x5f16be58, 0xe707c658, 0x49eae5c7, 0xd5d147ad, 0x9a7abdc3,
-    0xe8ac7fc7, 0x84ec3aae, 0xc24942d0, 0x294aa318, 0x08ac3d18, 0x8894042e, 0xb24609b0, 0x9bcaab58,
-    0xc400f712, 0xd5c512b8, 0x2c02cc62, 0x25080fd8, 0xed74a847, 0x18a5ec5e, 0x9850ec6d, 0xf8909758,
-    0x7f56f481, 0x4496f23c, 0xae27784f, 0xcb7cd93e, 0x06e32860, 0x50b9a84f, 0x3660434a, 0x09161f5f,
-    0x900486bc, 0x08055459, 0xe7ec1017, 0x7e39494c, 0x4f443b25, 0x14751a8a, 0x717d03d4, 0xbd0e24d8,
-    0x054b6f56, 0x854c496c, 0xd92a454a, 0xc39bd054, 0x6093614b, 0x9dbad754, 0x5bf0604a, 0x99f22305
-};
-
 void DumpAddresses()
 {
     int64 nStart = GetTimeMillis();
@@ -1374,24 +1274,14 @@ void ThreadOpenConnections()
         CSemaphoreGrant grant(*semOutbound);
         boost::this_thread::interruption_point();
 
-        // Add seed nodes if IRC isn't working
-        if (addrman.size()==0 && (GetTime() - nStart > 60) && !fTestNet)
-        {
-            std::vector<CAddress> vAdd;
-            for (unsigned int i = 0; i < ARRAYLEN(pnSeed); i++)
-            {
-                // It'll only connect to one or two seed nodes because once it connects,
-                // it'll get a pile of addresses with newer timestamps.
-                // Seed nodes are given a random 'last seen time' of between one and two
-                // weeks ago.
-                const int64 nOneWeek = 7*24*60*60;
-                struct in_addr ip;
-                memcpy(&ip, &pnSeed[i], sizeof(ip));
-                CAddress addr(CService(ip, GetDefaultPort()));
-                addr.nTime = GetTime()-GetRand(nOneWeek)-nOneWeek;
-                vAdd.push_back(addr);
+        // Add seed nodes if DNS seeds are all down (an infrastructure attack?).
+        if (addrman.size() == 0 && (GetTime() - nStart > 60)) {
+            static bool done = false;
+            if (!done) {
+                printf("Adding fixed seed nodes as DNS doesn't seem to be available.\n");
+                addrman.Add(Params().FixedSeeds(), CNetAddr("127.0.0.1"));
+                done = true;
             }
-            addrman.Add(vAdd, CNetAddr("127.0.0.1"));
         }
 
         //
@@ -1440,7 +1330,7 @@ void ThreadOpenConnections()
                 continue;
 
             // do not allow non-default ports, unless after 50 invalid addresses selected already
-            if (addr.GetPort() != GetDefaultPort() && nTries < 50)
+            if (addr.GetPort() != Params().GetDefaultPort() && nTries < 50)
                 continue;
 
             addrConnect = addr;
@@ -1490,7 +1380,7 @@ void ThreadOpenAddedConnections()
         BOOST_FOREACH(string& strAddNode, lAddresses)
         {
             vector<CService> vservNode(0);
-            if(Lookup(strAddNode.c_str(), vservNode, GetDefaultPort(), fNameLookup, 0))
+            if(Lookup(strAddNode.c_str(), vservNode, Params().GetDefaultPort(), fNameLookup, 0))
             {
                 lservAddressesToAdd.push_back(vservNode);
                 {
diff --git a/src/protocol.cpp b/src/protocol.cpp
index 1e22467a33..745b4338e4 100644
--- a/src/protocol.cpp
+++ b/src/protocol.cpp
@@ -21,7 +21,7 @@ static const char* ppszTypeName[] =
 
 CMessageHeader::CMessageHeader()
 {
-    memcpy(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart));
+    memcpy(pchMessageStart, Params().MessageStart(), MESSAGE_START_SIZE);
     memset(pchCommand, 0, sizeof(pchCommand));
     pchCommand[1] = 1;
     nMessageSize = -1;
@@ -30,7 +30,7 @@ CMessageHeader::CMessageHeader()
 
 CMessageHeader::CMessageHeader(const char* pszCommand, unsigned int nMessageSizeIn)
 {
-    memcpy(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart));
+    memcpy(pchMessageStart, Params().MessageStart(), MESSAGE_START_SIZE);
     strncpy(pchCommand, pszCommand, COMMAND_SIZE);
     nMessageSize = nMessageSizeIn;
     nChecksum = 0;
@@ -47,7 +47,7 @@ std::string CMessageHeader::GetCommand() const
 bool CMessageHeader::IsValid() const
 {
     // Check start string
-    if (memcmp(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart)) != 0)
+    if (memcmp(pchMessageStart, Params().MessageStart(), MESSAGE_START_SIZE) != 0)
         return false;
 
     // Check the command string for errors
diff --git a/src/protocol.h b/src/protocol.h
index 4998425070..ae541dfdba 100644
--- a/src/protocol.h
+++ b/src/protocol.h
@@ -10,20 +10,12 @@
 #ifndef __INCLUDED_PROTOCOL_H__
 #define __INCLUDED_PROTOCOL_H__
 
+#include "chainparams.h"
 #include "serialize.h"
 #include "netbase.h"
 #include <string>
 #include "uint256.h"
 
-extern bool fTestNet;
-static inline unsigned short GetDefaultPort(const bool testnet = fTestNet)
-{
-    return testnet ? 18333 : 8333;
-}
-
-
-extern unsigned char pchMessageStart[4];
-
 /** Message header.
  * (4) message start.
  * (12) command.
@@ -50,7 +42,6 @@ class CMessageHeader
     // TODO: make private (improves encapsulation)
     public:
         enum {
-            MESSAGE_START_SIZE=sizeof(::pchMessageStart),
             COMMAND_SIZE=12,
             MESSAGE_SIZE_SIZE=sizeof(int),
             CHECKSUM_SIZE=sizeof(int),
diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
index e8d99a8d45..5cf4dd8111 100644
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -5,6 +5,7 @@
 #include "addresstablemodel.h"
 #include "transactiontablemodel.h"
 
+#include "chainparams.h"
 #include "alert.h"
 #include "main.h"
 #include "checkpoints.h"
@@ -110,7 +111,7 @@ void ClientModel::updateAlert(const QString &hash, int status)
 
 bool ClientModel::isTestNet() const
 {
-    return fTestNet;
+    return TestNet();
 }
 
 bool ClientModel::inInitialBlockDownload() const
diff --git a/src/rpcmining.cpp b/src/rpcmining.cpp
index 6f8ac7a112..d0b0a70be4 100644
--- a/src/rpcmining.cpp
+++ b/src/rpcmining.cpp
@@ -3,6 +3,7 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include "chainparams.h"
 #include "main.h"
 #include "db.h"
 #include "init.h"
@@ -93,7 +94,7 @@ Value getmininginfo(const Array& params, bool fHelp)
     obj.push_back(Pair("genproclimit",     (int)GetArg("-genproclimit", -1)));
     obj.push_back(Pair("hashespersec",     gethashespersec(params, false)));
     obj.push_back(Pair("pooledtx",         (uint64_t)mempool.size()));
-    obj.push_back(Pair("testnet",          fTestNet));
+    obj.push_back(Pair("testnet",          TestNet()));
     return obj;
 }
 
diff --git a/src/rpcnet.cpp b/src/rpcnet.cpp
index 644c2675ae..bd7bc0ba10 100644
--- a/src/rpcnet.cpp
+++ b/src/rpcnet.cpp
@@ -157,7 +157,7 @@ Value getaddednodeinfo(const Array& params, bool fHelp)
     BOOST_FOREACH(string& strAddNode, laddedNodes)
     {
         vector<CService> vservNode(0);
-        if(Lookup(strAddNode.c_str(), vservNode, GetDefaultPort(), fNameLookup, 0))
+        if(Lookup(strAddNode.c_str(), vservNode, Params().GetDefaultPort(), fNameLookup, 0))
             laddedAddreses.push_back(make_pair(strAddNode, vservNode));
         else
         {
diff --git a/src/rpcwallet.cpp b/src/rpcwallet.cpp
index 585bdb2bfb..5388bd4d84 100644
--- a/src/rpcwallet.cpp
+++ b/src/rpcwallet.cpp
@@ -79,7 +79,7 @@ Value getinfo(const Array& params, bool fHelp)
     obj.push_back(Pair("connections",   (int)vNodes.size()));
     obj.push_back(Pair("proxy",         (proxy.first.IsValid() ? proxy.first.ToStringIPPort() : string())));
     obj.push_back(Pair("difficulty",    (double)GetDifficulty()));
-    obj.push_back(Pair("testnet",       fTestNet));
+    obj.push_back(Pair("testnet",       TestNet()));
     obj.push_back(Pair("keypoololdest", (boost::int64_t)pwalletMain->GetOldestKeyPoolTime()));
     obj.push_back(Pair("keypoolsize",   pwalletMain->GetKeyPoolSize()));
     obj.push_back(Pair("paytxfee",      ValueFromAmount(nTransactionFee)));
diff --git a/src/test/DoS_tests.cpp b/src/test/DoS_tests.cpp
index b1e98f65ed..ea0cc1bcef 100644
--- a/src/test/DoS_tests.cpp
+++ b/src/test/DoS_tests.cpp
@@ -8,6 +8,7 @@
 #include <boost/test/unit_test.hpp>
 #include <boost/foreach.hpp>
 
+#include "chainparams.h"
 #include "main.h"
 #include "wallet.h"
 #include "net.h"
@@ -25,7 +26,7 @@ CService ip(uint32_t i)
 {
     struct in_addr s;
     s.s_addr = i;
-    return CService(CNetAddr(s), GetDefaultPort());
+    return CService(CNetAddr(s), Params().GetDefaultPort());
 }
 
 BOOST_AUTO_TEST_SUITE(DoS_tests)
diff --git a/src/test/base58_tests.cpp b/src/test/base58_tests.cpp
index 2741672a88..af65416485 100644
--- a/src/test/base58_tests.cpp
+++ b/src/test/base58_tests.cpp
@@ -108,8 +108,6 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_parse)
     std::vector<unsigned char> result;
     CBitcoinSecret secret;
     CBitcoinAddress addr;
-    // Save global state
-    bool fTestNet_stored = fTestNet;
 
     BOOST_FOREACH(Value& tv, tests)
     {
@@ -125,7 +123,10 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_parse)
         const Object &metadata = test[2].get_obj();
         bool isPrivkey = find_value(metadata, "isPrivkey").get_bool();
         bool isTestnet = find_value(metadata, "isTestnet").get_bool();
-        fTestNet = isTestnet; // Override testnet flag
+        if (isTestnet)
+            SelectParams(CChainParams::TESTNET);
+        else
+            SelectParams(CChainParams::MAIN);
         if(isPrivkey)
         {
             bool isCompressed = find_value(metadata, "isCompressed").get_bool();
@@ -156,8 +157,7 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_parse)
             BOOST_CHECK_MESSAGE(!secret.IsValid(), "IsValid pubkey as privkey:" + strTest);
         }
     }
-    // Restore global state
-    fTestNet = fTestNet_stored;
+    SelectParams(CChainParams::MAIN);
 }
 
 // Goal: check that generated keys match test vectors
@@ -165,9 +165,6 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_gen)
 {
     Array tests = read_json("base58_keys_valid.json");
     std::vector<unsigned char> result;
-    // Save global state
-    bool fTestNet_stored = fTestNet;
-
     BOOST_FOREACH(Value& tv, tests)
     {
         Array test = tv.get_array();
@@ -182,7 +179,10 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_gen)
         const Object &metadata = test[2].get_obj();
         bool isPrivkey = find_value(metadata, "isPrivkey").get_bool();
         bool isTestnet = find_value(metadata, "isTestnet").get_bool();
-        fTestNet = isTestnet; // Override testnet flag
+        if (isTestnet)
+            SelectParams(CChainParams::TESTNET);
+        else
+            SelectParams(CChainParams::MAIN);
         if(isPrivkey)
         {
             bool isCompressed = find_value(metadata, "isCompressed").get_bool();
@@ -225,8 +225,7 @@ BOOST_AUTO_TEST_CASE(base58_keys_valid_gen)
     CTxDestination nodest = CNoDestination();
     BOOST_CHECK(!boost::apply_visitor(CBitcoinAddressVisitor(&dummyAddr), nodest));
 
-    // Restore global state
-    fTestNet = fTestNet_stored;
+    SelectParams(CChainParams::MAIN);
 }
 
 // Goal: check that base58 parsing code is robust against a variety of corrupted data
diff --git a/src/txdb.cpp b/src/txdb.cpp
index 3d34710d22..34836eaa97 100644
--- a/src/txdb.cpp
+++ b/src/txdb.cpp
@@ -6,6 +6,7 @@
 #include "txdb.h"
 #include "main.h"
 #include "hash.h"
+#include "chainparams.h"
 
 using namespace std;
 
@@ -223,7 +224,7 @@ bool CBlockTreeDB::LoadBlockIndexGuts()
                 pindexNew->nTx            = diskindex.nTx;
 
                 // Watch for genesis block
-                if (pindexGenesisBlock == NULL && diskindex.GetBlockHash() == hashGenesisBlock)
+                if (pindexGenesisBlock == NULL && diskindex.GetBlockHash() == Params().HashGenesisBlock())
                     pindexGenesisBlock = pindexNew;
 
                 if (!pindexNew->CheckIndex())
diff --git a/src/util.cpp b/src/util.cpp
index f4892a2387..bfb6d75838 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -13,6 +13,7 @@
 #include <sys/resource.h>
 #endif
 
+#include "chainparams.h"
 #include "util.h"
 #include "sync.h"
 #include "version.h"
@@ -78,7 +79,6 @@ bool fDaemon = false;
 bool fServer = false;
 bool fCommandLine = false;
 string strMiscWarning;
-bool fTestNet = false;
 bool fNoListen = false;
 bool fLogTimestamps = false;
 CMedianFilter<int64> vTimeOffsets(200,0);
@@ -1068,8 +1068,8 @@ const boost::filesystem::path &GetDataDir(bool fNetSpecific)
     } else {
         path = GetDefaultDataDir();
     }
-    if (fNetSpecific && GetBoolArg("-testnet", false))
-        path /= "testnet3";
+    if (fNetSpecific)
+        path /= Params().DataDir();
 
     fs::create_directories(path);
 
diff --git a/src/util.h b/src/util.h
index 9173b5bb58..86a38ad331 100644
--- a/src/util.h
+++ b/src/util.h
@@ -143,7 +143,6 @@ extern bool fDaemon;
 extern bool fServer;
 extern bool fCommandLine;
 extern std::string strMiscWarning;
-extern bool fTestNet;
 extern bool fNoListen;
 extern bool fLogTimestamps;
 extern volatile bool fReopenDebugLog;
author	Mike Hearn <hearn@google.com>	2013-05-07 15:16:25 +0200
committer	Mike Hearn <hearn@google.com>	2013-06-19 16:28:52 +0200
commit	0e4b31755534fac4ea6c20a60f719e3694252220 (patch)
tree	80f576f67c855485e5d82007b98a45536bbf2f9a
parent	70e7fba06da36218688a4cae4a5d12332c714247 (diff)