X-Git-Url: https://git.novaco.in/?p=novacoin.git;a=blobdiff_plain;f=src%2Fmain.cpp;h=68190ad82c701793a802307947557ecac20caf79;hp=70c761d1b80227abda47d1026c79ccc27902468c;hb=f6123ec5244fa565ebeba660de94a47b28ef0105;hpb=03aa39a354a0aa7331df82e8d401b29e5cb7082c

diff --git a/src/main.cpp b/src/main.cpp
index 70c761d..68190ad 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,18 +1,22 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2012 The Bitcoin developers
-// Copyright (c) 2011-2012 The PPCoin developers
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include "alert.h"
 #include "checkpoints.h"
 #include "db.h"
+#include "txdb.h"
 #include "net.h"
 #include "init.h"
 #include "ui_interface.h"
+#include "kernel.h"
+#include "zerocoin/Zerocoin.h"
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/filesystem/fstream.hpp>
 
+
 using namespace std;
 using namespace boost;
 
@@ -30,13 +34,28 @@ unsigned int nTransactionsUpdated = 0;
 
 map<uint256, CBlockIndex*> mapBlockIndex;
 set<pair<COutPoint, unsigned int> > setStakeSeen;
-uint256 hashGenesisBlock = hashGenesisBlockOfficial;
-static CBigNum bnProofOfWorkLimit(~uint256(0) >> 32);
-static CBigNum bnInitialHashTarget(~uint256(0) >> 36);
+libzerocoin::Params* ZCParams;
+
+CBigNum bnProofOfWorkLimit(~uint256(0) >> 20); // "standard" scrypt target limit for proof of work, results with 0,000244140625 proof-of-work difficulty
+CBigNum bnProofOfStakeLegacyLimit(~uint256(0) >> 24); // proof of stake target limit from block #15000 and until 20 June 2013, results with 0,00390625 proof of stake difficulty
+CBigNum bnProofOfStakeLimit(~uint256(0) >> 27); // proof of stake target limit since 20 June 2013, equal to 0.03125  proof of stake difficulty
+CBigNum bnProofOfStakeHardLimit(~uint256(0) >> 30); // disabled temporarily, will be used in the future to fix minimal proof of stake difficulty at 0.25
+uint256 nPoWBase = uint256("0x00000000ffff0000000000000000000000000000000000000000000000000000"); // difficulty-1 target
+
+CBigNum bnProofOfWorkLimitTestNet(~uint256(0) >> 16);
+
+unsigned int nStakeMinAge = 60 * 60 * 24 * 30; // 30 days as minimum age for coin age
+unsigned int nStakeMaxAge = 60 * 60 * 24 * 90; // 90 days as stake age of full weight
+unsigned int nStakeTargetSpacing = 10 * 60; // 10-minute stakes spacing
+unsigned int nModifierInterval = 6 * 60 * 60; // time to elapse before new modifier is computed
+
+int nCoinbaseMaturity = 500;
 CBlockIndex* pindexGenesisBlock = NULL;
 int nBestHeight = -1;
-uint64 nBestChainTrust = 0;
-uint64 nBestInvalidTrust = 0;
+
+uint256 nBestChainTrust = 0;
+uint256 nBestInvalidTrust = 0;
+
 uint256 hashBestChain = 0;
 CBlockIndex* pindexBest = NULL;
 int64 nTimeBestReceived = 0;
@@ -46,22 +65,20 @@ CMedianFilter<int> cPeerBlockCounts(5, 0); // Amount of blocks that other nodes
 map<uint256, CBlock*> mapOrphanBlocks;
 multimap<uint256, CBlock*> mapOrphanBlocksByPrev;
 set<pair<COutPoint, unsigned int> > setStakeSeenOrphan;
+map<uint256, uint256> mapProofOfStake;
 
-map<uint256, CDataStream*> mapOrphanTransactions;
-map<uint256, map<uint256, CDataStream*> > mapOrphanTransactionsByPrev;
+map<uint256, CTransaction> mapOrphanTransactions;
+map<uint256, set<uint256> > mapOrphanTransactionsByPrev;
 
 // Constant stuff for coinbase transactions we create:
 CScript COINBASE_FLAGS;
 
-const string strMessageMagic = "PPCoin Signed Message:\n";
-
-double dHashesPerSec;
-int64 nHPSTimerStart;
+const string strMessageMagic = "NovaCoin Signed Message:\n";
 
 // Settings
 int64 nTransactionFee = MIN_TX_FEE;
-
-
+bool fStakeUsePooledKeys = false;
+extern enum Checkpoints::CPMode CheckpointsMode;
 
 //////////////////////////////////////////////////////////////////////////////
 //
@@ -113,7 +130,7 @@ void static EraseFromWallets(uint256 hash)
 }
 
 // make sure all wallets know about the given transaction, in the given block
-void static SyncWithWallets(const CTransaction& tx, const CBlock* pblock = NULL, bool fUpdate = false, bool fConnect = true)
+void SyncWithWallets(const CTransaction& tx, const CBlock* pblock, bool fUpdate, bool fConnect)
 {
     if (!fConnect)
     {
@@ -160,7 +177,7 @@ void static Inventory(const uint256& hash)
 }
 
 // ask wallets to resend their transactions
-void static ResendWalletTransactions()
+void ResendWalletTransactions()
 {
     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
         pwallet->ResendWalletTransactions();
@@ -177,16 +194,12 @@ void static ResendWalletTransactions()
 // mapOrphanTransactions
 //
 
-bool AddOrphanTx(const CDataStream& vMsg)
+bool AddOrphanTx(const CTransaction& tx)
 {
-    CTransaction tx;
-    CDataStream(vMsg) >> tx;
     uint256 hash = tx.GetHash();
     if (mapOrphanTransactions.count(hash))
         return false;
 
-    CDataStream* pvMsg = new CDataStream(vMsg);
-
     // Ignore big transactions, to avoid a
     // send-big-orphans memory exhaustion attack. If a peer has a legitimate
     // large transaction with a missing parent then we assume
@@ -194,18 +207,20 @@ bool AddOrphanTx(const CDataStream& vMsg)
     // have been mined or received.
     // 10,000 orphans, each of which is at most 5,000 bytes big is
     // at most 500 megabytes of orphans:
-    if (pvMsg->size() > 5000)
+
+    size_t nSize = tx.GetSerializeSize(SER_NETWORK, CTransaction::CURRENT_VERSION);
+
+    if (nSize > 5000)
     {
-        printf("ignoring large orphan tx (size: %u, hash: %s)\n", pvMsg->size(), hash.ToString().substr(0,10).c_str());
-        delete pvMsg;
+        printf("ignoring large orphan tx (size: %"PRIszu", hash: %s)\n", nSize, hash.ToString().substr(0,10).c_str());
         return false;
     }
 
-    mapOrphanTransactions[hash] = pvMsg;
+    mapOrphanTransactions[hash] = tx;
     BOOST_FOREACH(const CTxIn& txin, tx.vin)
-        mapOrphanTransactionsByPrev[txin.prevout.hash].insert(make_pair(hash, pvMsg));
+        mapOrphanTransactionsByPrev[txin.prevout.hash].insert(hash);
 
-    printf("stored orphan tx %s (mapsz %u)\n", hash.ToString().substr(0,10).c_str(),
+    printf("stored orphan tx %s (mapsz %"PRIszu")\n", hash.ToString().substr(0,10).c_str(),
         mapOrphanTransactions.size());
     return true;
 }
@@ -214,16 +229,13 @@ void static EraseOrphanTx(uint256 hash)
 {
     if (!mapOrphanTransactions.count(hash))
         return;
-    const CDataStream* pvMsg = mapOrphanTransactions[hash];
-    CTransaction tx;
-    CDataStream(*pvMsg) >> tx;
+    const CTransaction& tx = mapOrphanTransactions[hash];
     BOOST_FOREACH(const CTxIn& txin, tx.vin)
     {
         mapOrphanTransactionsByPrev[txin.prevout.hash].erase(hash);
         if (mapOrphanTransactionsByPrev[txin.prevout.hash].empty())
             mapOrphanTransactionsByPrev.erase(txin.prevout.hash);
     }
-    delete pvMsg;
     mapOrphanTransactions.erase(hash);
 }
 
@@ -234,7 +246,7 @@ unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
     {
         // Evict a random orphan:
         uint256 randomhash = GetRandHash();
-        map<uint256, CDataStream*>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
+        map<uint256, CTransaction>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
         if (it == mapOrphanTransactions.end())
             it = mapOrphanTransactions.begin();
         EraseOrphanTx(it->first);
@@ -284,6 +296,9 @@ bool CTransaction::ReadFromDisk(COutPoint prevout)
 
 bool CTransaction::IsStandard() const
 {
+    if (nVersion > CTransaction::CURRENT_VERSION)
+        return false;
+
     BOOST_FOREACH(const CTxIn& txin, vin)
     {
         // Biggest 'standard' txin is a 3-signature 3-of-3 CHECKMULTISIG
@@ -294,9 +309,12 @@ bool CTransaction::IsStandard() const
         if (!txin.scriptSig.IsPushOnly())
             return false;
     }
-    BOOST_FOREACH(const CTxOut& txout, vout)
+    BOOST_FOREACH(const CTxOut& txout, vout) {
         if (!::IsStandard(txout.scriptPubKey))
             return false;
+        if (txout.nValue == 0)
+            return false;
+    }
     return true;
 }
 
@@ -451,14 +469,16 @@ bool CTransaction::CheckTransaction() const
 
     // Check for negative or overflow output values
     int64 nValueOut = 0;
-    for (int i = 0; i < vout.size(); i++)
+    for (unsigned int i = 0; i < vout.size(); i++)
     {
         const CTxOut& txout = vout[i];
-        if (txout.IsEmpty() && (!IsCoinBase()) && (!IsCoinStake()))
+        if (txout.IsEmpty() && !IsCoinBase() && !IsCoinStake())
             return DoS(100, error("CTransaction::CheckTransaction() : txout empty for user transaction"));
-        // ppcoin: enforce minimum output amount
-        if ((!txout.IsEmpty()) && txout.nValue < MIN_TXOUT_AMOUNT)
+
+        // NovaCoin: enforce minimum output amount for user transactions
+        if (!IsCoinBase() && !txout.IsEmpty() && txout.nValue < MIN_TXOUT_AMOUNT)
             return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue below minimum"));
+
         if (txout.nValue > MAX_MONEY)
             return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue too high"));
         nValueOut += txout.nValue;
@@ -478,7 +498,7 @@ bool CTransaction::CheckTransaction() const
     if (IsCoinBase())
     {
         if (vin[0].scriptSig.size() < 2 || vin[0].scriptSig.size() > 100)
-            return DoS(100, error("CTransaction::CheckTransaction() : coinbase script size"));
+            return DoS(100, error("CTransaction::CheckTransaction() : coinbase script size is invalid"));
     }
     else
     {
@@ -490,6 +510,38 @@ bool CTransaction::CheckTransaction() const
     return true;
 }
 
+int64 CTransaction::GetMinFee(unsigned int nBlockSize, bool fAllowFree,
+                              enum GetMinFee_mode mode) const
+{
+    // Base fee is either MIN_TX_FEE or MIN_RELAY_TX_FEE
+    int64 nBaseFee = (mode == GMF_RELAY) ? MIN_RELAY_TX_FEE : MIN_TX_FEE;
+
+    unsigned int nBytes = ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION);
+    unsigned int nNewBlockSize = nBlockSize + nBytes;
+    int64 nMinFee = (1 + (int64)nBytes / 1000) * nBaseFee;
+
+    // To limit dust spam, require MIN_TX_FEE/MIN_RELAY_TX_FEE if any output is less than 0.01
+    if (nMinFee < nBaseFee)
+    {
+        BOOST_FOREACH(const CTxOut& txout, vout)
+            if (txout.nValue < CENT)
+                nMinFee = nBaseFee;
+    }
+
+    // Raise the price as the block approaches full
+    if (nBlockSize != 1 && nNewBlockSize >= MAX_BLOCK_SIZE_GEN/2)
+    {
+        if (nNewBlockSize >= MAX_BLOCK_SIZE_GEN)
+            return MAX_MONEY;
+        nMinFee *= MAX_BLOCK_SIZE_GEN / (MAX_BLOCK_SIZE_GEN - nNewBlockSize);
+    }
+
+    if (!MoneyRange(nMinFee))
+        nMinFee = MAX_MONEY;
+    return nMinFee;
+}
+
+
 bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs,
                         bool* pfMissingInputs)
 {
@@ -502,6 +554,7 @@ bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs,
     // Coinbase is only valid in a block, not as a loose transaction
     if (tx.IsCoinBase())
         return tx.DoS(100, error("CTxMemPool::accept() : coinbase as individual tx"));
+
     // ppcoin: coinstake is also only valid in a block, not as a loose transaction
     if (tx.IsCoinStake())
         return tx.DoS(100, error("CTxMemPool::accept() : coinstake as individual tx"));
@@ -564,7 +617,7 @@ bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs,
                 return error("CTxMemPool::accept() : FetchInputs found invalid tx %s", hash.ToString().substr(0,10).c_str());
             if (pfMissingInputs)
                 *pfMissingInputs = true;
-            return error("CTxMemPool::accept() : FetchInputs failed %s", hash.ToString().substr(0,10).c_str());
+            return false;
         }
 
         // Check for non-standard pay-to-script-hash in inputs
@@ -579,12 +632,15 @@ bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs,
         unsigned int nSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
 
         // Don't accept it if it can't get into a block
-        if (nFees < tx.GetMinFee(1000, false, GMF_RELAY))
-            return error("CTxMemPool::accept() : not enough fees");
+        int64 txMinFee = tx.GetMinFee(1000, false, GMF_RELAY);
+        if (nFees < txMinFee)
+            return error("CTxMemPool::accept() : not enough fees %s, %"PRI64d" < %"PRI64d,
+                         hash.ToString().c_str(),
+                         nFees, txMinFee);
 
         // Continuously rate-limit free transactions
         // This mitigates 'penny-flooding' -- sending thousands of free transactions just to
-        // be annoying or make other's transactions take longer to confirm.
+        // be annoying or make others' transactions take longer to confirm.
         if (nFees < MIN_RELAY_TX_FEE)
         {
             static CCriticalSection cs;
@@ -623,7 +679,7 @@ bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs,
             printf("CTxMemPool::accept() : replacing tx %s with new version\n", ptxOld->GetHash().ToString().c_str());
             remove(*ptxOld);
         }
-        addUnchecked(tx);
+        addUnchecked(hash, tx);
     }
 
     ///// are we sure this is ok when loading transactions or restoring block txes
@@ -631,7 +687,9 @@ bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs,
     if (ptxOld)
         EraseFromWallets(ptxOld->GetHash());
 
-    printf("CTxMemPool::accept() : accepted %s\n", hash.ToString().substr(0,10).c_str());
+    printf("CTxMemPool::accept() : accepted %s (poolsz %"PRIszu")\n",
+           hash.ToString().substr(0,10).c_str(),
+           mapTx.size());
     return true;
 }
 
@@ -640,14 +698,11 @@ bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMi
     return mempool.accept(txdb, *this, fCheckInputs, pfMissingInputs);
 }
 
-bool CTxMemPool::addUnchecked(CTransaction &tx)
+bool CTxMemPool::addUnchecked(const uint256& hash, CTransaction &tx)
 {
-    printf("addUnchecked(): size %lu\n",  mapTx.size());
     // Add to memory pool without checking anything.  Don't call this directly,
     // call CTxMemPool::accept to properly check the transaction first.
     {
-        LOCK(cs);
-        uint256 hash = tx.GetHash();
         mapTx[hash] = tx;
         for (unsigned int i = 0; i < tx.vin.size(); i++)
             mapNextTx[tx.vin[i].prevout] = CInPoint(&mapTx[hash], i);
@@ -674,7 +729,23 @@ bool CTxMemPool::remove(CTransaction &tx)
     return true;
 }
 
+void CTxMemPool::clear()
+{
+    LOCK(cs);
+    mapTx.clear();
+    mapNextTx.clear();
+    ++nTransactionsUpdated;
+}
 
+void CTxMemPool::queryHashes(std::vector<uint256>& vtxid)
+{
+    vtxid.clear();
+
+    LOCK(cs);
+    vtxid.reserve(mapTx.size());
+    for (map<uint256, CTransaction>::iterator mi = mapTx.begin(); mi != mapTx.end(); ++mi)
+        vtxid.push_back((*mi).first);
+}
 
 
 
@@ -709,7 +780,7 @@ int CMerkleTx::GetBlocksToMaturity() const
 {
     if (!(IsCoinBase() || IsCoinStake()))
         return 0;
-    return max(0, (COINBASE_MATURITY+20) - GetDepthInMainChain());
+    return max(0, (nCoinbaseMaturity+20) - GetDepthInMainChain());
 }
 
 
@@ -777,7 +848,31 @@ int CTxIndex::GetDepthInMainChain() const
     return 1 + nBestHeight - pindex->nHeight;
 }
 
-
+// Return transaction in tx, and if it was found inside a block, its hash is placed in hashBlock
+bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock)
+{
+    {
+        LOCK(cs_main);
+        {
+            LOCK(mempool.cs);
+            if (mempool.exists(hash))
+            {
+                tx = mempool.lookup(hash);
+                return true;
+            }
+        }
+        CTxDB txdb("r");
+        CTxIndex txindex;
+        if (tx.ReadFromDisk(txdb, COutPoint(hash, 0), txindex))
+        {
+            CBlock block;
+            if (block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
+                hashBlock = block.GetHash();
+            return true;
+        }
+    }
+    return false;
+}
 
 
 
@@ -791,6 +886,24 @@ int CTxIndex::GetDepthInMainChain() const
 // CBlock and CBlockIndex
 //
 
+static CBlockIndex* pblockindexFBBHLast;
+CBlockIndex* FindBlockByHeight(int nHeight)
+{
+    CBlockIndex *pblockindex;
+    if (nHeight < nBestHeight / 2)
+        pblockindex = pindexGenesisBlock;
+    else
+        pblockindex = pindexBest;
+    if (pblockindexFBBHLast && abs(nHeight - pblockindex->nHeight) > abs(nHeight - pblockindexFBBHLast->nHeight))
+        pblockindex = pblockindexFBBHLast;
+    while (pblockindex->nHeight > nHeight)
+        pblockindex = pblockindex->pprev;
+    while (pblockindex->nHeight < nHeight)
+        pblockindex = pblockindex->pnext;
+    pblockindexFBBHLast = pblockindex;
+    return pblockindex;
+}
+
 bool CBlock::ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions)
 {
     if (!fReadTransactions)
@@ -822,17 +935,38 @@ uint256 WantedByOrphan(const CBlock* pblockOrphan)
     return pblockOrphan->hashPrevBlock;
 }
 
-int64 static GetProofOfWorkReward(unsigned int nBits)
+// select stake target limit according to hard-coded conditions
+CBigNum inline GetProofOfStakeLimit(int nHeight, unsigned int nTime)
+{
+    if(fTestNet) // separate proof of stake target limit for testnet
+        return bnProofOfStakeLimit;
+    if(nTime > TARGETS_SWITCH_TIME) // 27 bits since 20 July 2013
+        return bnProofOfStakeLimit;
+    if(nHeight + 1 > 15000) // 24 bits since block 15000
+        return bnProofOfStakeLegacyLimit;
+    if(nHeight + 1 > 14060) // 31 bits since block 14060 until 15000
+        return bnProofOfStakeHardLimit;
+
+    return bnProofOfWorkLimit; // return bnProofOfWorkLimit of none matched
+}
+
+// miner's coin base reward based on nBits
+int64 GetProofOfWorkReward(unsigned int nBits)
 {
     CBigNum bnSubsidyLimit = MAX_MINT_PROOF_OF_WORK;
+
     CBigNum bnTarget;
     bnTarget.SetCompact(nBits);
     CBigNum bnTargetLimit = bnProofOfWorkLimit;
     bnTargetLimit.SetCompact(bnTargetLimit.GetCompact());
 
-    // ppcoin: subsidy is cut in half every 16x multiply of difficulty
+    // NovaCoin: subsidy is cut in half every 64x multiply of PoW difficulty
     // A reasonably continuous curve is used to avoid shock to market
-    // (nSubsidyLimit / nSubsidy) ** 4 == bnProofOfWorkLimit / bnTarget
+    // (nSubsidyLimit / nSubsidy) ** 6 == bnProofOfWorkLimit / bnTarget
+    //
+    // Human readable form:
+    //
+    // nSubsidy = 100 / (diff ^ 1/6)
     CBigNum bnLowerBound = CENT;
     CBigNum bnUpperBound = bnSubsidyLimit;
     while (bnLowerBound + CENT <= bnUpperBound)
@@ -840,55 +974,163 @@ int64 static GetProofOfWorkReward(unsigned int nBits)
         CBigNum bnMidValue = (bnLowerBound + bnUpperBound) / 2;
         if (fDebug && GetBoolArg("-printcreation"))
             printf("GetProofOfWorkReward() : lower=%"PRI64d" upper=%"PRI64d" mid=%"PRI64d"\n", bnLowerBound.getuint64(), bnUpperBound.getuint64(), bnMidValue.getuint64());
-        if (bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnTargetLimit > bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnTarget)
+        if (bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnTargetLimit > bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnTarget)
             bnUpperBound = bnMidValue;
         else
             bnLowerBound = bnMidValue;
     }
 
     int64 nSubsidy = bnUpperBound.getuint64();
+
     nSubsidy = (nSubsidy / CENT) * CENT;
     if (fDebug && GetBoolArg("-printcreation"))
         printf("GetProofOfWorkReward() : create=%s nBits=0x%08x nSubsidy=%"PRI64d"\n", FormatMoney(nSubsidy).c_str(), nBits, nSubsidy);
 
-    return nSubsidy;
+    return min(nSubsidy, MAX_MINT_PROOF_OF_WORK);
 }
 
-// ppcoin: miner's coin stake is rewarded based on coin age spent (coin-days)
-int64 GetProofOfStakeReward(int64 nCoinAge)
+// miner's coin stake reward based on nBits and coin age spent (coin-days)
+int64 GetProofOfStakeReward(int64 nCoinAge, unsigned int nBits, unsigned int nTime, bool bCoinYearOnly)
 {
-    static int64 nRewardCoinYear = CENT;  // creation amount per coin-year
-    int64 nSubsidy = nCoinAge * 33 / (365 * 33 + 8) * nRewardCoinYear;
+    int64 nRewardCoinYear, nSubsidy, nSubsidyLimit = 10 * COIN;
+
+    if(fTestNet || nTime > STAKE_SWITCH_TIME)
+    {
+        // Stage 2 of emission process is PoS-based. It will be active on mainNet since 20 Jun 2013.
+
+        CBigNum bnRewardCoinYearLimit = MAX_MINT_PROOF_OF_STAKE; // Base stake mint rate, 100% year interest
+        CBigNum bnTarget;
+        bnTarget.SetCompact(nBits);
+        CBigNum bnTargetLimit = GetProofOfStakeLimit(0, nTime);
+        bnTargetLimit.SetCompact(bnTargetLimit.GetCompact());
+
+        // NovaCoin: A reasonably continuous curve is used to avoid shock to market
+
+        CBigNum bnLowerBound = 1 * CENT, // Lower interest bound is 1% per year
+            bnUpperBound = bnRewardCoinYearLimit, // Upper interest bound is 100% per year
+            bnMidPart, bnRewardPart;
+
+        while (bnLowerBound + CENT <= bnUpperBound)
+        {
+            CBigNum bnMidValue = (bnLowerBound + bnUpperBound) / 2;
+            if (fDebug && GetBoolArg("-printcreation"))
+                printf("GetProofOfStakeReward() : lower=%"PRI64d" upper=%"PRI64d" mid=%"PRI64d"\n", bnLowerBound.getuint64(), bnUpperBound.getuint64(), bnMidValue.getuint64());
+
+            if(!fTestNet && nTime < STAKECURVE_SWITCH_TIME)
+            {
+                //
+                // Until 20 Oct 2013: reward for coin-year is cut in half every 64x multiply of PoS difficulty
+                //
+                // (nRewardCoinYearLimit / nRewardCoinYear) ** 6 == bnProofOfStakeLimit / bnTarget
+                //
+                // Human readable form: nRewardCoinYear = 1 / (posdiff ^ 1/6)
+                //
+
+                bnMidPart = bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue;
+                bnRewardPart = bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit;
+            }
+            else
+            {
+                //
+                // Since 20 Oct 2013: reward for coin-year is cut in half every 8x multiply of PoS difficulty
+                //
+                // (nRewardCoinYearLimit / nRewardCoinYear) ** 3 == bnProofOfStakeLimit / bnTarget
+                //
+                // Human readable form: nRewardCoinYear = 1 / (posdiff ^ 1/3)
+                //
+
+                bnMidPart = bnMidValue * bnMidValue * bnMidValue;
+                bnRewardPart = bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit;
+            }
+
+            if (bnMidPart * bnTargetLimit > bnRewardPart * bnTarget)
+                bnUpperBound = bnMidValue;
+            else
+                bnLowerBound = bnMidValue;
+        }
+
+        nRewardCoinYear = bnUpperBound.getuint64();
+        nRewardCoinYear = min((nRewardCoinYear / CENT) * CENT, MAX_MINT_PROOF_OF_STAKE);
+    }
+    else
+    {
+        // Old creation amount per coin-year, 5% fixed stake mint rate
+        nRewardCoinYear = 5 * CENT;
+    }
+
+    if(bCoinYearOnly)
+        return nRewardCoinYear;
+
+    nSubsidy = nCoinAge * nRewardCoinYear * 33 / (365 * 33 + 8);
+
+    // Set reasonable reward limit for large inputs since 20 Oct 2013
+    //
+    // This will stimulate large holders to use smaller inputs, that's good for the network protection
+    if(fTestNet || STAKECURVE_SWITCH_TIME < nTime)
+    {
+        if (fDebug && GetBoolArg("-printcreation") && nSubsidyLimit < nSubsidy)
+            printf("GetProofOfStakeReward(): %s is greater than %s, coinstake reward will be truncated\n", FormatMoney(nSubsidy).c_str(), FormatMoney(nSubsidyLimit).c_str());
+
+        nSubsidy = min(nSubsidy, nSubsidyLimit);
+    }
+
     if (fDebug && GetBoolArg("-printcreation"))
-        printf("GetProofOfStakeReward(): create=%s nCoinAge=%"PRI64d"\n", FormatMoney(nSubsidy).c_str(), nCoinAge);
+        printf("GetProofOfStakeReward(): create=%s nCoinAge=%"PRI64d" nBits=%d\n", FormatMoney(nSubsidy).c_str(), nCoinAge, nBits);
     return nSubsidy;
 }
 
 static const int64 nTargetTimespan = 7 * 24 * 60 * 60;  // one week
-static const int64 nTargetSpacingStake = 10 * 60;       // ten minutes
-static const int64 nTargetSpacingWorkMax = 2 * 60 * 60; // two hours
-static const int64 nMaxClockDrift = 2 * 60 * 60;        // two hours
+
+// get proof of work blocks max spacing according to hard-coded conditions
+int64 inline GetTargetSpacingWorkMax(int nHeight, unsigned int nTime)
+{
+    if(nTime > TARGETS_SWITCH_TIME)
+        return 3 * nStakeTargetSpacing; // 30 minutes on mainNet since 20 Jul 2013 00:00:00
+
+    if(fTestNet)
+        return 3 * nStakeTargetSpacing; // 15 minutes on testNet
+
+    return 12 * nStakeTargetSpacing; // 2 hours otherwise
+}
 
 //
-// minimum amount of work that could possibly be required nTime after
-// minimum work required was nBase
+// maximum nBits value could possible be required nTime after
 //
-unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
+unsigned int ComputeMaxBits(CBigNum bnTargetLimit, unsigned int nBase, int64 nTime)
 {
     CBigNum bnResult;
     bnResult.SetCompact(nBase);
     bnResult *= 2;
-    while (nTime > 0 && bnResult < bnProofOfWorkLimit)
+    while (nTime > 0 && bnResult < bnTargetLimit)
     {
         // Maximum 200% adjustment per day...
         bnResult *= 2;
         nTime -= 24 * 60 * 60;
     }
-    if (bnResult > bnProofOfWorkLimit)
-        bnResult = bnProofOfWorkLimit;
+    if (bnResult > bnTargetLimit)
+        bnResult = bnTargetLimit;
     return bnResult.GetCompact();
 }
 
+//
+// minimum amount of work that could possibly be required nTime after
+// minimum proof-of-work required was nBase
+//
+unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
+{
+    return ComputeMaxBits(bnProofOfWorkLimit, nBase, nTime);
+}
+
+//
+// minimum amount of stake that could possibly be required nTime after
+// minimum proof-of-stake required was nBase
+//
+unsigned int ComputeMinStake(unsigned int nBase, int64 nTime, unsigned int nBlockTime)
+{
+    return ComputeMaxBits(GetProofOfStakeLimit(0, nBlockTime), nBase, nTime);
+}
+
+
 // ppcoin: find last block index up to pindex
 const CBlockIndex* GetLastBlockIndex(const CBlockIndex* pindex, bool fProofOfStake)
 {
@@ -897,17 +1139,19 @@ const CBlockIndex* GetLastBlockIndex(const CBlockIndex* pindex, bool fProofOfSta
     return pindex;
 }
 
-unsigned int static GetNextTargetRequired(const CBlockIndex* pindexLast, bool fProofOfStake)
+unsigned int GetNextTargetRequired(const CBlockIndex* pindexLast, bool fProofOfStake)
 {
+    CBigNum bnTargetLimit = !fProofOfStake ? bnProofOfWorkLimit : GetProofOfStakeLimit(pindexLast->nHeight, pindexLast->nTime);
+
     if (pindexLast == NULL)
-        return bnProofOfWorkLimit.GetCompact(); // genesis block
+        return bnTargetLimit.GetCompact(); // genesis block
 
     const CBlockIndex* pindexPrev = GetLastBlockIndex(pindexLast, fProofOfStake);
     if (pindexPrev->pprev == NULL)
-        return bnInitialHashTarget.GetCompact(); // first block
+        return bnTargetLimit.GetCompact(); // first block
     const CBlockIndex* pindexPrevPrev = GetLastBlockIndex(pindexPrev->pprev, fProofOfStake);
     if (pindexPrevPrev->pprev == NULL)
-        return bnInitialHashTarget.GetCompact(); // second block
+        return bnTargetLimit.GetCompact(); // second block
 
     int64 nActualSpacing = pindexPrev->GetBlockTime() - pindexPrevPrev->GetBlockTime();
 
@@ -915,13 +1159,13 @@ unsigned int static GetNextTargetRequired(const CBlockIndex* pindexLast, bool fP
     // ppcoin: retarget with exponential moving toward target spacing
     CBigNum bnNew;
     bnNew.SetCompact(pindexPrev->nBits);
-    int64 nTargetSpacing = fProofOfStake? nTargetSpacingStake : min(nTargetSpacingWorkMax, nTargetSpacingStake * (1 + pindexLast->nHeight - pindexPrev->nHeight));
+    int64 nTargetSpacing = fProofOfStake? nStakeTargetSpacing : min(GetTargetSpacingWorkMax(pindexLast->nHeight, pindexLast->nTime), (int64) nStakeTargetSpacing * (1 + pindexLast->nHeight - pindexPrev->nHeight));
     int64 nInterval = nTargetTimespan / nTargetSpacing;
     bnNew *= ((nInterval - 1) * nTargetSpacing + nActualSpacing + nActualSpacing);
     bnNew /= ((nInterval + 1) * nTargetSpacing);
 
-    if (bnNew > bnProofOfWorkLimit)
-        bnNew = bnProofOfWorkLimit;
+    if (bnNew > bnTargetLimit)
+        bnNew = bnTargetLimit;
 
     return bnNew.GetCompact();
 }
@@ -968,14 +1212,25 @@ void static InvalidChainFound(CBlockIndex* pindexNew)
     if (pindexNew->nChainTrust > nBestInvalidTrust)
     {
         nBestInvalidTrust = pindexNew->nChainTrust;
-        CTxDB().WriteBestInvalidTrust(nBestInvalidTrust);
-        MainFrameRepaint();
+        CTxDB().WriteBestInvalidTrust(CBigNum(nBestInvalidTrust));
+        uiInterface.NotifyBlocksChanged();
     }
-    printf("InvalidChainFound: invalid block=%s  height=%d  trust=%s\n", pindexNew->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->nHeight, CBigNum(pindexNew->nChainTrust).ToString().c_str());
-    printf("InvalidChainFound:  current best=%s  height=%d  trust=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, CBigNum(nBestChainTrust).ToString().c_str());
-    // ppcoin: should not enter safe mode for longer invalid chain
+
+    uint256 nBestInvalidBlockTrust = pindexNew->nChainTrust - pindexNew->pprev->nChainTrust;
+    uint256 nBestBlockTrust = pindexBest->nHeight != 0 ? (pindexBest->nChainTrust - pindexBest->pprev->nChainTrust) : pindexBest->nChainTrust;
+
+    printf("InvalidChainFound: invalid block=%s  height=%d  trust=%s  blocktrust=%"PRI64d"  date=%s\n",
+      pindexNew->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->nHeight,
+      CBigNum(pindexNew->nChainTrust).ToString().c_str(), nBestInvalidBlockTrust.Get64(),
+      DateTimeStrFormat("%x %H:%M:%S", pindexNew->GetBlockTime()).c_str());
+    printf("InvalidChainFound:  current best=%s  height=%d  trust=%s  blocktrust=%"PRI64d"  date=%s\n",
+      hashBestChain.ToString().substr(0,20).c_str(), nBestHeight,
+      CBigNum(pindexBest->nChainTrust).ToString().c_str(),
+      nBestBlockTrust.Get64(),
+      DateTimeStrFormat("%x %H:%M:%S", pindexBest->GetBlockTime()).c_str());
 }
 
+
 void CBlock::UpdateTime(const CBlockIndex* pindexPrev)
 {
     nTime = max(GetBlockTime(), GetAdjustedTime());
@@ -1020,7 +1275,7 @@ bool CTransaction::DisconnectInputs(CTxDB& txdb)
     // Remove transaction from index
     // This can fail if a duplicate of this transaction was in a chain that got
     // reorganized away. This is only possible if this transaction was completely
-    // spent, so erasing it would be a no-op anway.
+    // spent, so erasing it would be a no-op anyway.
     txdb.EraseTxIndex(*this);
 
     return true;
@@ -1083,7 +1338,7 @@ bool CTransaction::FetchInputs(CTxDB& txdb, const map<uint256, CTxIndex>& mapTes
         }
     }
 
-    // Make sure all prevout.n's are valid:
+    // Make sure all prevout.n indexes are valid:
     for (unsigned int i = 0; i < vin.size(); i++)
     {
         const COutPoint prevout = vin[i].prevout;
@@ -1095,7 +1350,7 @@ bool CTransaction::FetchInputs(CTxDB& txdb, const map<uint256, CTxIndex>& mapTes
             // Revisit this if/when transaction replacement is implemented and allows
             // adding inputs:
             fInvalid = true;
-            return DoS(100, error("FetchInputs() : %s prevout.n out of range %d %d %d prev tx %s\n%s", GetHash().ToString().substr(0,10).c_str(), prevout.n, txPrev.vout.size(), txindex.vSpent.size(), prevout.hash.ToString().substr(0,10).c_str(), txPrev.ToString().c_str()));
+            return DoS(100, error("FetchInputs() : %s prevout.n out of range %d %"PRIszu" %"PRIszu" prev tx %s\n%s", GetHash().ToString().substr(0,10).c_str(), prevout.n, txPrev.vout.size(), txindex.vSpent.size(), prevout.hash.ToString().substr(0,10).c_str(), txPrev.ToString().c_str()));
         }
     }
 
@@ -1164,13 +1419,13 @@ bool CTransaction::ConnectInputs(CTxDB& txdb, MapPrevTx inputs,
             CTransaction& txPrev = inputs[prevout.hash].second;
 
             if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
-                return DoS(100, error("ConnectInputs() : %s prevout.n out of range %d %d %d prev tx %s\n%s", GetHash().ToString().substr(0,10).c_str(), prevout.n, txPrev.vout.size(), txindex.vSpent.size(), prevout.hash.ToString().substr(0,10).c_str(), txPrev.ToString().c_str()));
+                return DoS(100, error("ConnectInputs() : %s prevout.n out of range %d %"PRIszu" %"PRIszu" prev tx %s\n%s", GetHash().ToString().substr(0,10).c_str(), prevout.n, txPrev.vout.size(), txindex.vSpent.size(), prevout.hash.ToString().substr(0,10).c_str(), txPrev.ToString().c_str()));
 
-            // If prev is coinbase/coinstake, check that it's matured
+            // If prev is coinbase or coinstake, check that it's matured
             if (txPrev.IsCoinBase() || txPrev.IsCoinStake())
-                for (const CBlockIndex* pindex = pindexBlock; pindex && pindexBlock->nHeight - pindex->nHeight < COINBASE_MATURITY; pindex = pindex->pprev)
+                for (const CBlockIndex* pindex = pindexBlock; pindex && pindexBlock->nHeight - pindex->nHeight < nCoinbaseMaturity; pindex = pindex->pprev)
                     if (pindex->nBlockPos == txindex.pos.nBlockPos && pindex->nFile == txindex.pos.nFile)
-                        return error("ConnectInputs() : tried to spend coinbase/coinstake at depth %d", pindexBlock->nHeight - pindex->nHeight);
+                        return error("ConnectInputs() : tried to spend %s at depth %d", txPrev.IsCoinBase() ? "coinbase" : "coinstake", pindexBlock->nHeight - pindex->nHeight);
 
             // ppcoin: check transaction timestamp
             if (txPrev.nTime > nTime)
@@ -1231,9 +1486,12 @@ bool CTransaction::ConnectInputs(CTxDB& txdb, MapPrevTx inputs,
             uint64 nCoinAge;
             if (!GetCoinAge(txdb, nCoinAge))
                 return error("ConnectInputs() : %s unable to get coin age for coinstake", GetHash().ToString().substr(0,10).c_str());
+
             int64 nStakeReward = GetValueOut() - nValueIn;
-            if (nStakeReward > GetProofOfStakeReward(nCoinAge))
-                return DoS(100, error("ConnectInputs() : %s stake reward exceeded", GetHash().ToString().substr(0,10).c_str()));
+            int64 nCalculatedStakeReward = GetProofOfStakeReward(nCoinAge, pindexBlock->nBits, nTime) - GetMinFee() + MIN_TX_FEE;
+
+            if (nStakeReward > nCalculatedStakeReward)
+                return DoS(100, error("ConnectInputs() : coinstake pays too much(actual=%"PRI64d" vs calculated=%"PRI64d")", nStakeReward, nCalculatedStakeReward));
         }
         else
         {
@@ -1247,6 +1505,7 @@ bool CTransaction::ConnectInputs(CTxDB& txdb, MapPrevTx inputs,
             // ppcoin: enforce transaction fees for every block
             if (nTxFee < GetMinFee())
                 return fBlock? DoS(100, error("ConnectInputs() : %s not paying required fee=%s, paid=%s", GetHash().ToString().substr(0,10).c_str(), FormatMoney(GetMinFee()).c_str(), FormatMoney(nTxFee).c_str())) : false;
+
             nFees += nTxFee;
             if (!MoneyRange(nFees))
                 return DoS(100, error("ConnectInputs() : nFees out of range"));
@@ -1330,10 +1589,10 @@ bool CBlock::DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex)
     return true;
 }
 
-bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
+bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex, bool fJustCheck)
 {
-    // Check it again in case a previous version let a bad block in
-    if (!CheckBlock())
+    // Check it again in case a previous version let a bad block in, but skip BlockSig checking
+    if (!CheckBlock(!fJustCheck, !fJustCheck, false))
         return false;
 
     // Do not allow blocks that contain transactions which 'overwrite' older transactions,
@@ -1343,44 +1602,53 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
     // being sent to another address.
     // See BIP30 and http://r6.ca/blog/20120206T005236Z.html for more information.
     // This logic is not necessary for memory pool transactions, as AcceptToMemoryPool
-    // already refuses previously-known transaction id's entirely.
-    // This rule applies to all blocks whose timestamp is after March 15, 2012, 0:00 UTC.
-    // On testnet it is enabled as of februari 20, 2012, 0:00 UTC.
-    if (pindex->nTime > 1331769600 || (fTestNet && pindex->nTime > 1329696000))
-    {
-        BOOST_FOREACH(CTransaction& tx, vtx)
-        {
-            CTxIndex txindexOld;
-            if (txdb.ReadTxIndex(tx.GetHash(), txindexOld))
-            {
-                BOOST_FOREACH(CDiskTxPos &pos, txindexOld.vSpent)
-                    if (pos.IsNull())
-                        return false;
-            }
-        }
-    }
-
-    // BIP16 didn't become active until Apr 1 2012 (Feb 15 on testnet)
-    int64 nBIP16SwitchTime = fTestNet ? 1329264000 : 1333238400;
-    bool fStrictPayToScriptHash = (pindex->nTime >= nBIP16SwitchTime);
+    // already refuses previously-known transaction ids entirely.
+    // This rule was originally applied all blocks whose timestamp was after March 15, 2012, 0:00 UTC.
+    // Now that the whole chain is irreversibly beyond that time it is applied to all blocks except the
+    // two in the chain that violate it. This prevents exploiting the issue against nodes in their
+    // initial block download.
+    bool fEnforceBIP30 = true; // Always active in NovaCoin
+    bool fStrictPayToScriptHash = true; // Always active in NovaCoin
 
     //// issue here: it doesn't know the version
-    unsigned int nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK, CLIENT_VERSION) - (2 * GetSizeOfCompactSize(0)) + GetSizeOfCompactSize(vtx.size());
+    unsigned int nTxPos;
+    if (fJustCheck)
+        // FetchInputs treats CDiskTxPos(1,1,1) as a special "refer to memorypool" indicator
+        // Since we're just checking the block and not actually connecting it, it might not (and probably shouldn't) be on the disk to get the transaction from
+        nTxPos = 1;
+    else
+        nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK, CLIENT_VERSION) - (2 * GetSizeOfCompactSize(0)) + GetSizeOfCompactSize(vtx.size());
 
     map<uint256, CTxIndex> mapQueuedChanges;
     int64 nFees = 0;
+    int64 nValueIn = 0;
+    int64 nValueOut = 0;
     unsigned int nSigOps = 0;
     BOOST_FOREACH(CTransaction& tx, vtx)
     {
+        uint256 hashTx = tx.GetHash();
+
+        if (fEnforceBIP30) {
+            CTxIndex txindexOld;
+            if (txdb.ReadTxIndex(hashTx, txindexOld)) {
+                BOOST_FOREACH(CDiskTxPos &pos, txindexOld.vSpent)
+                    if (pos.IsNull())
+                        return false;
+            }
+        }
+
         nSigOps += tx.GetLegacySigOpCount();
         if (nSigOps > MAX_BLOCK_SIGOPS)
             return DoS(100, error("ConnectBlock() : too many sigops"));
 
         CDiskTxPos posThisTx(pindex->nFile, pindex->nBlockPos, nTxPos);
-        nTxPos += ::GetSerializeSize(tx, SER_DISK, CLIENT_VERSION);
+        if (!fJustCheck)
+            nTxPos += ::GetSerializeSize(tx, SER_DISK, CLIENT_VERSION);
 
         MapPrevTx mapInputs;
-        if (!tx.IsCoinBase())
+        if (tx.IsCoinBase())
+            nValueOut += tx.GetValueOut();
+        else
         {
             bool fInvalid;
             if (!tx.FetchInputs(txdb, mapQueuedChanges, true, false, mapInputs, fInvalid))
@@ -1396,16 +1664,34 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
                     return DoS(100, error("ConnectBlock() : too many sigops"));
             }
 
+            int64 nTxValueIn = tx.GetValueIn(mapInputs);
+            int64 nTxValueOut = tx.GetValueOut();
+            nValueIn += nTxValueIn;
+            nValueOut += nTxValueOut;
             if (!tx.IsCoinStake())
-                nFees += tx.GetValueIn(mapInputs)-tx.GetValueOut();
+                nFees += nTxValueIn - nTxValueOut;
 
             if (!tx.ConnectInputs(txdb, mapInputs, mapQueuedChanges, posThisTx, pindex, true, false, fStrictPayToScriptHash))
                 return false;
         }
 
-        mapQueuedChanges[tx.GetHash()] = CTxIndex(posThisTx, tx.vout.size());
+        mapQueuedChanges[hashTx] = CTxIndex(posThisTx, tx.vout.size());
     }
 
+    // ppcoin: track money supply and mint amount info
+    pindex->nMint = nValueOut - nValueIn + nFees;
+    pindex->nMoneySupply = (pindex->pprev? pindex->pprev->nMoneySupply : 0) + nValueOut - nValueIn;
+    if (!txdb.WriteBlockIndex(CDiskBlockIndex(pindex)))
+        return error("Connect() : WriteBlockIndex for pindex failed");
+
+    // ppcoin: fees are not collected by miners as in bitcoin
+    // ppcoin: fees are destroyed to compensate the entire network
+    if (fDebug && GetBoolArg("-printcreation"))
+        printf("ConnectBlock() : destroy=%s nFees=%"PRI64d"\n", FormatMoney(nFees).c_str(), nFees);
+
+    if (fJustCheck)
+        return true;
+
     // Write queued txindex changes
     for (map<uint256, CTxIndex>::iterator mi = mapQueuedChanges.begin(); mi != mapQueuedChanges.end(); ++mi)
     {
@@ -1413,13 +1699,6 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
             return error("ConnectBlock() : UpdateTxIndex failed");
     }
 
-    // ppcoin: fees are not collected by miners as in bitcoin
-    // ppcoin: fees are destroyed to compensate the entire network
-    if (IsProofOfWork() && vtx[0].GetValueOut() > GetProofOfWorkReward(nBits))
-        return false;
-    if (fDebug && GetBoolArg("-printcreation"))
-        printf("ConnectBlock() : destroy=%s nFees=%"PRI64d"\n", FormatMoney(nFees).c_str(), nFees);
-
     // Update block index on disk without changing it in memory.
     // The memory index structure will be changed after the db commits.
     if (pindex->pprev)
@@ -1437,7 +1716,7 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
     return true;
 }
 
-bool Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
+bool static Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
 {
     printf("REORGANIZE\n");
 
@@ -1466,8 +1745,8 @@ bool Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
         vConnect.push_back(pindex);
     reverse(vConnect.begin(), vConnect.end());
 
-    printf("REORGANIZE: Disconnect %i blocks; %s..%s\n", vDisconnect.size(), pfork->GetBlockHash().ToString().substr(0,20).c_str(), pindexBest->GetBlockHash().ToString().substr(0,20).c_str());
-    printf("REORGANIZE: Connect %i blocks; %s..%s\n", vConnect.size(), pfork->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->GetBlockHash().ToString().substr(0,20).c_str());
+    printf("REORGANIZE: Disconnect %"PRIszu" blocks; %s..%s\n", vDisconnect.size(), pfork->GetBlockHash().ToString().substr(0,20).c_str(), pindexBest->GetBlockHash().ToString().substr(0,20).c_str());
+    printf("REORGANIZE: Connect %"PRIszu" blocks; %s..%s\n", vConnect.size(), pfork->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->GetBlockHash().ToString().substr(0,20).c_str());
 
     // Disconnect shorter branch
     vector<CTransaction> vResurrect;
@@ -1496,7 +1775,6 @@ bool Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
         if (!block.ConnectBlock(txdb, pindex))
         {
             // Invalid block
-            txdb.TxnAbort();
             return error("Reorganize() : ConnectBlock %s failed", pindex->GetBlockHash().ToString().substr(0,20).c_str());
         }
 
@@ -1535,14 +1813,6 @@ bool Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
 }
 
 
-static void
-runCommand(std::string strCommand)
-{
-    int nErr = ::system(strCommand.c_str());
-    if (nErr)
-        printf("runCommand error: system(%s) returned %d\n", strCommand.c_str(), nErr);
-}
-
 // Called from inside SetBestChain: attaches a block to the new best chain being built
 bool CBlock::SetBestChainInner(CTxDB& txdb, CBlockIndex *pindexNew)
 {
@@ -1575,7 +1845,7 @@ bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
     if (!txdb.TxnBegin())
         return error("SetBestChain() : TxnBegin failed");
 
-    if (pindexGenesisBlock == NULL && hash == hashGenesisBlock)
+    if (pindexGenesisBlock == NULL && hash == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet))
     {
         txdb.WriteHashBestChain(hash);
         if (!txdb.TxnCommit())
@@ -1604,7 +1874,7 @@ bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
         }
 
         if (!vpindexSecondary.empty())
-            printf("Postponing %i reconnects\n", vpindexSecondary.size());
+            printf("Postponing %"PRIszu" reconnects\n", vpindexSecondary.size());
 
         // Switch to new best branch
         if (!Reorganize(txdb, pindexIntermediate))
@@ -1614,7 +1884,7 @@ bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
             return error("SetBestChain() : Reorganize failed");
         }
 
-        // Connect futher blocks
+        // Connect further blocks
         BOOST_REVERSE_FOREACH(CBlockIndex *pindex, vpindexSecondary)
         {
             CBlock block;
@@ -1644,11 +1914,37 @@ bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
     // New best block
     hashBestChain = hash;
     pindexBest = pindexNew;
+    pblockindexFBBHLast = NULL;
     nBestHeight = pindexBest->nHeight;
     nBestChainTrust = pindexNew->nChainTrust;
     nTimeBestReceived = GetTime();
     nTransactionsUpdated++;
-    printf("SetBestChain: new best=%s  height=%d  trust=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, CBigNum(nBestChainTrust).ToString().c_str());
+
+    uint256 nBestBlockTrust = pindexBest->nHeight != 0 ? (pindexBest->nChainTrust - pindexBest->pprev->nChainTrust) : pindexBest->nChainTrust;
+
+    printf("SetBestChain: new best=%s  height=%d  trust=%s  blocktrust=%"PRI64d"  date=%s\n",
+      hashBestChain.ToString().substr(0,20).c_str(), nBestHeight,
+      CBigNum(nBestChainTrust).ToString().c_str(),
+      nBestBlockTrust.Get64(),
+      DateTimeStrFormat("%x %H:%M:%S", pindexBest->GetBlockTime()).c_str());
+
+    // Check the version of the last 100 blocks to see if we need to upgrade:
+    if (!fIsInitialDownload)
+    {
+        int nUpgraded = 0;
+        const CBlockIndex* pindex = pindexBest;
+        for (int i = 0; i < 100 && pindex != NULL; i++)
+        {
+            if (pindex->nVersion > CBlock::CURRENT_VERSION)
+                ++nUpgraded;
+            pindex = pindex->pprev;
+        }
+        if (nUpgraded > 0)
+            printf("SetBestChain: %d of last 100 blocks above version %d\n", nUpgraded, CBlock::CURRENT_VERSION);
+        if (nUpgraded > 100/2)
+            // strMiscWarning is read by GetWarnings(), called by Qt and the JSON-RPC code to warn the user:
+            strMiscWarning = _("Warning: This version is obsolete, upgrade required!");
+    }
 
     std::string strCmd = GetArg("-blocknotify", "");
 
@@ -1661,70 +1957,6 @@ bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
     return true;
 }
 
-
-// ppcoin: coinstake must meet hash target according to the protocol:
-// input 0 must meet the formula
-//     hash(nBits + txPrev.block.nTime + txPrev.offset + txPrev.nTime + txPrev.vout.n + nTime) < bnTarget * nCoinDay
-// this ensures that the chance of getting a coinstake is proportional to the
-// amount of coin age one owns.
-// The reason this hash is chosen is the following:
-//   nBits: encodes all past block timestamps, making computing hash in advance
-//          more difficult
-//   txPrev.block.nTime: prevent nodes from guessing a good timestamp to
-//                       generate transaction for future advantage
-//   txPrev.offset: offset of txPrev inside block, to reduce the chance of 
-//                  nodes generating coinstake at the same time
-//   txPrev.nTime: reduce the chance of nodes generating coinstake at the same
-//                 time
-//   txPrev.vout.n: output number of txPrev, to reduce the chance of nodes
-//                  generating coinstake at the same time
-//   block/tx hash should not be used here as they can be generated in vast
-//   quantities so as to generate blocks faster, degrading the system back into
-//   a proof-of-work situation.
-//
-bool CTransaction::CheckProofOfStake(unsigned int nBits) const
-{
-    CBigNum bnTargetPerCoinDay;
-    bnTargetPerCoinDay.SetCompact(nBits);
- 
-    if (!IsCoinStake())
-        return true;
-
-    // Input 0 must match the stake hash target per coin age (nBits)
-    const CTxIn& txin = vin[0];
-
-    // First try finding the previous transaction in database
-    CTxDB txdb("r");
-    CTransaction txPrev;
-    CTxIndex txindex;
-    if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
-        return false;  // previous transaction not in main chain
-    txdb.Close();
-    if (nTime < txPrev.nTime)
-        return false;  // Transaction timestamp violation
-
-    // Verify signature
-    if (!VerifySignature(txPrev, *this, 0, true, 0))
-        return DoS(100, error("CheckProofOfStake() : VerifySignature failed on coinstake %s", GetHash().ToString().c_str()));
-
-    // Read block header
-    CBlock block;
-    if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
-        return false; // unable to read block of previous transaction
-    if (block.GetBlockTime() + STAKE_MIN_AGE > nTime)
-        return false; // only count coins meeting min age requirement
-
-    int64 nValueIn = txPrev.vout[txin.prevout.n].nValue;
-    CBigNum bnCoinDay = CBigNum(nValueIn) * (nTime-txPrev.nTime) / COIN / (24 * 60 * 60);
-    // Calculate hash
-    CDataStream ss(SER_GETHASH, 0);
-    ss << nBits << block.nTime << (txindex.pos.nTxPos - txindex.pos.nBlockPos) << txPrev.nTime << txin.prevout.n << nTime;
-    if (CBigNum(Hash(ss.begin(), ss.end())) <= bnCoinDay * bnTargetPerCoinDay)
-        return true;
-    else
-        return DoS(100, error("CheckProofOfStake() : check target failed on coinstake %s", GetHash().ToString().c_str()));
-}
-
 // ppcoin: total coin age spent in transaction, in the unit of coin-days.
 // Only those coins meeting minimum age requirement counts. As those
 // transactions not in main chain are not currently indexed so we
@@ -1754,14 +1986,14 @@ bool CTransaction::GetCoinAge(CTxDB& txdb, uint64& nCoinAge) const
         CBlock block;
         if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
             return false; // unable to read block of previous transaction
-        if (block.GetBlockTime() + STAKE_MIN_AGE > nTime)
+        if (block.GetBlockTime() + nStakeMinAge > nTime)
             continue; // only count coins meeting min age requirement
 
         int64 nValueIn = txPrev.vout[txin.prevout.n].nValue;
         bnCentSecond += CBigNum(nValueIn) * (nTime-txPrev.nTime) / CENT;
 
         if (fDebug && GetBoolArg("-printcoinage"))
-            printf("coin age nValueIn=%-12I64d nTimeDiff=%d bnCentSecond=%s\n", nValueIn, nTime - txPrev.nTime, bnCentSecond.ToString().c_str());
+            printf("coin age nValueIn=%"PRI64d" nTimeDiff=%d bnCentSecond=%s\n", nValueIn, nTime - txPrev.nTime, bnCentSecond.ToString().c_str());
     }
 
     CBigNum bnCoinDay = bnCentSecond * CENT / COIN / (24 * 60 * 60);
@@ -1793,7 +2025,6 @@ bool CBlock::GetCoinAge(uint64& nCoinAge) const
     return true;
 }
 
-
 bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
 {
     // Check for duplicate
@@ -1805,11 +2036,7 @@ bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
     CBlockIndex* pindexNew = new CBlockIndex(nFile, nBlockPos, *this);
     if (!pindexNew)
         return error("AddToBlockIndex() : new CBlockIndex failed");
-    map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
-    if (pindexNew->fProofOfStake) 
-        setStakeSeen.insert(make_pair(pindexNew->prevoutStake, pindexNew->nStakeTime));
-
-    pindexNew->phashBlock = &((*mi).first);
+    pindexNew->phashBlock = &hash;
     map<uint256, CBlockIndex*>::iterator miPrev = mapBlockIndex.find(hashPrevBlock);
     if (miPrev != mapBlockIndex.end())
     {
@@ -1818,11 +2045,37 @@ bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
     }
 
     // ppcoin: compute chain trust score
-    uint64 nCoinAge;
-    if (!GetCoinAge(nCoinAge))
-        return error("AddToBlockIndex() : invalid transaction in block");
-    pindexNew->nChainTrust = (pindexNew->pprev ? pindexNew->pprev->nChainTrust : 0) + nCoinAge;
+    pindexNew->nChainTrust = (pindexNew->pprev ? pindexNew->pprev->nChainTrust : 0) + pindexNew->GetBlockTrust();
+
+    // ppcoin: compute stake entropy bit for stake modifier
+    if (!pindexNew->SetStakeEntropyBit(GetStakeEntropyBit(pindexNew->nTime)))
+        return error("AddToBlockIndex() : SetStakeEntropyBit() failed");
 
+    // ppcoin: record proof-of-stake hash value
+    if (pindexNew->IsProofOfStake())
+    {
+        if (!mapProofOfStake.count(hash))
+            return error("AddToBlockIndex() : hashProofOfStake not found in map");
+        pindexNew->hashProofOfStake = mapProofOfStake[hash];
+    }
+
+    // ppcoin: compute stake modifier
+    uint64 nStakeModifier = 0;
+    bool fGeneratedStakeModifier = false;
+    if (!ComputeNextStakeModifier(pindexNew->pprev, nStakeModifier, fGeneratedStakeModifier))
+        return error("AddToBlockIndex() : ComputeNextStakeModifier() failed");
+    pindexNew->SetStakeModifier(nStakeModifier, fGeneratedStakeModifier);
+    pindexNew->nStakeModifierChecksum = GetStakeModifierChecksum(pindexNew);
+    if (!CheckStakeModifierCheckpoints(pindexNew->nHeight, pindexNew->nStakeModifierChecksum))
+        return error("AddToBlockIndex() : Rejected by stake modifier checkpoint height=%d, modifier=0x%016"PRI64x, pindexNew->nHeight, nStakeModifier);
+
+    // Add to mapBlockIndex
+    map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
+    if (pindexNew->IsProofOfStake())
+        setStakeSeen.insert(make_pair(pindexNew->prevoutStake, pindexNew->nStakeTime));
+    pindexNew->phashBlock = &((*mi).first);
+
+    // Write to disk block index
     CTxDB txdb;
     if (!txdb.TxnBegin())
         return false;
@@ -1835,8 +2088,6 @@ bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
         if (!SetBestChain(txdb, pindexNew))
             return false;
 
-    txdb.Close();
-
     if (pindexNew == pindexBest)
     {
         // Notify UI to display prev block's coinbase if it was ours
@@ -1845,14 +2096,14 @@ bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
         hashPrevBestCoinBase = vtx[0].GetHash();
     }
 
-    MainFrameRepaint();
+    uiInterface.NotifyBlocksChanged();
     return true;
 }
 
 
 
 
-bool CBlock::CheckBlock() const
+bool CBlock::CheckBlock(bool fCheckPOW, bool fCheckMerkleRoot, bool fCheckSig) const
 {
     // These are checks that are independent of context
     // that can be verified before saving an orphan block.
@@ -1862,7 +2113,7 @@ bool CBlock::CheckBlock() const
         return DoS(100, error("CheckBlock() : size limits failed"));
 
     // Check proof of work matches claimed amount
-    if (IsProofOfWork() && !CheckProofOfWork(GetHash(), nBits))
+    if (fCheckPOW && IsProofOfWork() && !CheckProofOfWork(GetHash(), nBits))
         return DoS(50, error("CheckBlock() : proof of work failed"));
 
     // Check timestamp
@@ -1876,28 +2127,62 @@ bool CBlock::CheckBlock() const
         if (vtx[i].IsCoinBase())
             return DoS(100, error("CheckBlock() : more than one coinbase"));
 
-    // ppcoin: only the second transaction can be the optional coinstake
-    for (int i = 2; i < vtx.size(); i++)
-        if (vtx[i].IsCoinStake())
-            return DoS(100, error("CheckBlock() : coinstake in wrong position"));
-
-    // ppcoin: coinbase output should be empty if proof-of-stake block
-    if (IsProofOfStake() && !vtx[0].vout[0].IsEmpty())
-        return error("CheckBlock() : coinbase output not empty for proof-of-stake block");
-
     // Check coinbase timestamp
     if (GetBlockTime() > (int64)vtx[0].nTime + nMaxClockDrift)
         return DoS(50, error("CheckBlock() : coinbase timestamp is too early"));
 
-    // Check coinstake timestamp
-    if (IsProofOfStake() && GetBlockTime() > (int64)vtx[1].nTime + nMaxClockDrift)
-        return DoS(50, error("CheckBlock() : coinstake timestamp is too early"));
+    if (IsProofOfStake())
+    {
+        // Coinbase output should be empty if proof-of-stake block
+        if (vtx[0].vout.size() != 1 || !vtx[0].vout[0].IsEmpty())
+            return DoS(100, error("CheckBlock() : coinbase output not empty for proof-of-stake block"));
+
+        // Second transaction must be coinstake, the rest must not be
+        if (vtx.empty() || !vtx[1].IsCoinStake())
+            return DoS(100, error("CheckBlock() : second tx is not coinstake"));
+        for (unsigned int i = 2; i < vtx.size(); i++)
+            if (vtx[i].IsCoinStake())
+                return DoS(100, error("CheckBlock() : more than one coinstake"));
+
+        // Check coinstake timestamp
+        if (!CheckCoinStakeTimestamp(GetBlockTime(), (int64)vtx[1].nTime))
+            return DoS(50, error("CheckBlock() : coinstake timestamp violation nTimeBlock=%"PRI64d" nTimeTx=%u", GetBlockTime(), vtx[1].nTime));
+
+        // NovaCoin: check proof-of-stake block signature
+        if (fCheckSig && !CheckBlockSignature(true))
+            return DoS(100, error("CheckBlock() : bad proof-of-stake block signature"));
+    }
+    else
+    {
+        int64 nReward = GetProofOfWorkReward(nBits);
+        // Check coinbase reward
+        if (vtx[0].GetValueOut() > nReward)
+            return DoS(50, error("CheckBlock() : coinbase reward exceeded (actual=%"PRI64d" vs calculated=%"PRI64d")",
+                   vtx[0].GetValueOut(),
+                   nReward));
+
+        // Should we check proof-of-work block signature or not?
+        //
+        // * Always skip on TestNet
+        // * Perform checking for the first 9689 blocks
+        // * Perform checking since last checkpoint until 20 Sep 2013 (will be removed after)
+
+        if(!fTestNet && fCheckSig)
+        {
+            bool checkEntropySig = (GetBlockTime() < ENTROPY_SWITCH_TIME);
+
+            // NovaCoin: check proof-of-work block signature
+            if (checkEntropySig && !CheckBlockSignature(false))
+                return DoS(100, error("CheckBlock() : bad proof-of-work block signature"));
+        }
+    }
 
     // Check transactions
     BOOST_FOREACH(const CTransaction& tx, vtx)
     {
         if (!tx.CheckTransaction())
             return DoS(tx.nDoS, error("CheckBlock() : CheckTransaction failed"));
+
         // ppcoin: check transaction timestamp
         if (GetBlockTime() < (int64)tx.nTime)
             return DoS(50, error("CheckBlock() : block timestamp earlier than transaction timestamp"));
@@ -1921,13 +2206,10 @@ bool CBlock::CheckBlock() const
     if (nSigOps > MAX_BLOCK_SIGOPS)
         return DoS(100, error("CheckBlock() : out-of-bounds SigOpCount"));
 
-    // Check merkleroot
-    if (hashMerkleRoot != BuildMerkleTree())
+    // Check merkle root
+    if (fCheckMerkleRoot && hashMerkleRoot != BuildMerkleTree())
         return DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"));
 
-    // ppcoin: check block signature
-    if (!CheckBlockSignature())
-        return DoS(100, error("CheckBlock() : bad block signature"));
 
     return true;
 }
@@ -1948,7 +2230,7 @@ bool CBlock::AcceptBlock()
 
     // Check proof-of-work or proof-of-stake
     if (nBits != GetNextTargetRequired(pindexPrev, IsProofOfStake()))
-        return DoS(100, error("AcceptBlock() : incorrect proof-of-work/proof-of-stake"));
+        return DoS(100, error("AcceptBlock() : incorrect %s", IsProofOfWork() ? "proof-of-work" : "proof-of-stake"));
 
     // Check timestamp against prev
     if (GetBlockTime() <= pindexPrev->GetMedianTimePast() || GetBlockTime() + nMaxClockDrift < pindexPrev->GetBlockTime())
@@ -1959,14 +2241,25 @@ bool CBlock::AcceptBlock()
         if (!tx.IsFinal(nHeight, GetBlockTime()))
             return DoS(10, error("AcceptBlock() : contains a non-final transaction"));
 
-    // Check that the block chain matches the known block chain up to a hardened checkpoint
+    // Check that the block chain matches the known block chain up to a checkpoint
     if (!Checkpoints::CheckHardened(nHeight, hash))
-        return DoS(100, error("AcceptBlock() : rejected by hardened checkpoint lockin at %d", nHeight));
+        return DoS(100, error("AcceptBlock() : rejected by hardened checkpoint lock-in at %d", nHeight));
 
-    // ppcoin: check that the block satisfies synchronized checkpoint
-    if (!Checkpoints::CheckSync(hash, pindexPrev))
+    bool cpSatisfies = Checkpoints::CheckSync(hash, pindexPrev);
+
+    // Check that the block satisfies synchronized checkpoint
+    if (CheckpointsMode == Checkpoints::STRICT && !cpSatisfies)
         return error("AcceptBlock() : rejected by synchronized checkpoint");
 
+    if (CheckpointsMode == Checkpoints::ADVISORY && !cpSatisfies)
+        strMiscWarning = _("WARNING: syncronized checkpoint violation detected, but skipped!");
+
+    // Enforce rule that the coinbase starts with serialized block height
+    CScript expect = CScript() << nHeight;
+    if (vtx[0].vin[0].scriptSig.size() < expect.size() ||
+        !std::equal(expect.begin(), expect.end(), vtx[0].vin[0].scriptSig.begin()))
+        return DoS(100, error("AcceptBlock() : block height mismatch in coinbase"));
+
     // Write block to history file
     if (!CheckDiskSpace(::GetSerializeSize(*this, SER_DISK, CLIENT_VERSION)))
         return error("AcceptBlock() : out of disk space");
@@ -1993,6 +2286,102 @@ bool CBlock::AcceptBlock()
     return true;
 }
 
+uint256 CBlockIndex::GetBlockTrust() const
+{
+    CBigNum bnTarget;
+    bnTarget.SetCompact(nBits);
+
+    if (bnTarget <= 0)
+        return 0;
+
+    /* Old protocol */
+    if (!fTestNet && GetBlockTime() < CHAINCHECKS_SWITCH_TIME)
+        return (IsProofOfStake()? ((CBigNum(1)<<256) / (bnTarget+1)).getuint256() : 1);
+
+    /* New protocol */
+
+    // Calculate work amount for block
+    uint256 nPoWTrust = (CBigNum(nPoWBase) / (bnTarget+1)).getuint256();
+
+    // Set nPowTrust to 1 if we are checking PoS block or PoW difficulty is too low
+    nPoWTrust = (IsProofOfStake() || nPoWTrust < 1) ? 1 : nPoWTrust;
+
+    // Return nPoWTrust for the first 12 blocks
+    if (pprev == NULL || pprev->nHeight < 12)
+        return nPoWTrust;
+
+    const CBlockIndex* currentIndex = pprev;
+
+    if(IsProofOfStake())
+    {
+        CBigNum bnNewTrust = (CBigNum(1)<<256) / (bnTarget+1);
+
+        // Return 1/3 of score if parent block is not the PoW block
+        if (!pprev->IsProofOfWork())
+            return (bnNewTrust / 3).getuint256();
+
+        int nPoWCount = 0;
+
+        // Check last 12 blocks type
+        while (pprev->nHeight - currentIndex->nHeight < 12)
+        {
+            if (currentIndex->IsProofOfWork())
+                nPoWCount++;
+            currentIndex = currentIndex->pprev;
+        }
+
+        // Return 1/3 of score if less than 3 PoW blocks found
+        if (nPoWCount < 3)
+            return (bnNewTrust / 3).getuint256();
+
+        return bnNewTrust.getuint256();
+    }
+    else
+    {
+        CBigNum bnLastBlockTrust = CBigNum(pprev->nChainTrust - pprev->pprev->nChainTrust);
+
+        // Return nPoWTrust + 2/3 of previous block score if two parent blocks are not PoS blocks
+        if (!(pprev->IsProofOfStake() && pprev->pprev->IsProofOfStake()))
+            return nPoWTrust + (2 * bnLastBlockTrust / 3).getuint256();
+
+        int nPoSCount = 0;
+
+        // Check last 12 blocks type
+        while (pprev->nHeight - currentIndex->nHeight < 12)
+        {
+            if (currentIndex->IsProofOfStake())
+                nPoSCount++;
+            currentIndex = currentIndex->pprev;
+        }
+
+        // Return nPoWTrust + 2/3 of previous block score if less than 7 PoS blocks found
+        if (nPoSCount < 7)
+            return nPoWTrust + (2 * bnLastBlockTrust / 3).getuint256();
+
+        bnTarget.SetCompact(pprev->nBits);
+
+        if (bnTarget <= 0)
+            return 0;
+
+        CBigNum bnNewTrust = (CBigNum(1)<<256) / (bnTarget+1);
+
+        // Return nPoWTrust + full trust score for previous block nBits
+        return nPoWTrust + bnNewTrust.getuint256();
+    }
+}
+
+bool CBlockIndex::IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned int nRequired, unsigned int nToCheck)
+{
+    unsigned int nFound = 0;
+    for (unsigned int i = 0; i < nToCheck && nFound < nRequired && pstart != NULL; i++)
+    {
+        if (pstart->nVersion >= minVersion)
+            ++nFound;
+        pstart = pstart->pprev;
+    }
+    return (nFound >= nRequired);
+}
+
 bool ProcessBlock(CNode* pfrom, CBlock* pblock)
 {
     // Check for duplicate
@@ -2013,10 +2402,16 @@ bool ProcessBlock(CNode* pfrom, CBlock* pblock)
         return error("ProcessBlock() : CheckBlock FAILED");
 
     // ppcoin: verify hash target and signature of coinstake tx
-    if (pblock->IsProofOfStake() && !pblock->vtx[1].CheckProofOfStake(pblock->nBits))
+    if (pblock->IsProofOfStake())
     {
-        printf("WARNING: ProcessBlock(): check proof-of-stake failed for block %s\n", hash.ToString().c_str());
-        return false; // do not error here as we expect this during initial block download
+        uint256 hashProofOfStake = 0, targetProofOfStake = 0;
+        if (!CheckProofOfStake(pblock->vtx[1], pblock->nBits, hashProofOfStake, targetProofOfStake))
+        {
+            printf("WARNING: ProcessBlock(): check proof-of-stake failed for block %s\n", hash.ToString().c_str());
+            return false; // do not error here as we expect this during initial block download
+        }
+        if (!mapProofOfStake.count(hash)) // add to mapProofOfStake
+            mapProofOfStake.insert(make_pair(hash, hashProofOfStake));
     }
 
     CBlockIndex* pcheckpoint = Checkpoints::GetLastSyncCheckpoint();
@@ -2027,7 +2422,11 @@ bool ProcessBlock(CNode* pfrom, CBlock* pblock)
         CBigNum bnNewBlock;
         bnNewBlock.SetCompact(pblock->nBits);
         CBigNum bnRequired;
-        bnRequired.SetCompact(ComputeMinWork(GetLastBlockIndex(pcheckpoint, pblock->IsProofOfStake())->nBits, deltaTime));
+
+        if (pblock->IsProofOfStake())
+            bnRequired.SetCompact(ComputeMinStake(GetLastBlockIndex(pcheckpoint, true)->nBits, deltaTime, pblock->nTime));
+        else
+            bnRequired.SetCompact(ComputeMinWork(GetLastBlockIndex(pcheckpoint, false)->nBits, deltaTime));
 
         if (bnNewBlock > bnRequired)
         {
@@ -2109,77 +2508,142 @@ bool CBlock::SignBlock(const CKeyStore& keystore)
 {
     vector<valtype> vSolutions;
     txnouttype whichType;
-    const CTxOut& txout = IsProofOfStake()? vtx[1].vout[1] : vtx[0].vout[0];
 
-    if (!Solver(txout.scriptPubKey, whichType, vSolutions))
-        return false;
-    if (whichType == TX_PUBKEY)
+    if(!IsProofOfStake())
     {
-        // Sign
-        const valtype& vchPubKey = vSolutions[0];
-        CKey key;
-        if (!keystore.GetKey(Hash160(vchPubKey), key))
-            return false;
-        if (key.GetPubKey() != vchPubKey)
+        for(unsigned int i = 0; i < vtx[0].vout.size(); i++)
+        {
+            const CTxOut& txout = vtx[0].vout[i];
+
+            if (!Solver(txout.scriptPubKey, whichType, vSolutions))
+                continue;
+
+            if (whichType == TX_PUBKEY)
+            {
+                // Sign
+                valtype& vchPubKey = vSolutions[0];
+                CKey key;
+
+                if (!keystore.GetKey(Hash160(vchPubKey), key))
+                    continue;
+                if (key.GetPubKey() != vchPubKey)
+                    continue;
+                if(!key.Sign(GetHash(), vchBlockSig))
+                    continue;
+
+                return true;
+            }
+        }
+    }
+    else
+    {
+        const CTxOut& txout = vtx[1].vout[1];
+
+        if (!Solver(txout.scriptPubKey, whichType, vSolutions))
             return false;
-        return key.Sign(GetHash(), vchBlockSig);
+
+        if (whichType == TX_PUBKEY)
+        {
+            // Sign
+            valtype& vchPubKey = vSolutions[0];
+            CKey key;
+
+            if (!keystore.GetKey(Hash160(vchPubKey), key))
+                return false;
+            if (key.GetPubKey() != vchPubKey)
+                return false;
+
+            return key.Sign(GetHash(), vchBlockSig);
+        }
     }
+
+    printf("Sign failed\n");
     return false;
 }
 
 // ppcoin: check block signature
-bool CBlock::CheckBlockSignature() const
+bool CBlock::CheckBlockSignature(bool fProofOfStake) const
 {
-    if (GetHash() == hashGenesisBlock)
+    if (GetHash() == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet))
         return vchBlockSig.empty();
 
     vector<valtype> vSolutions;
     txnouttype whichType;
-    const CTxOut& txout = IsProofOfStake()? vtx[1].vout[1] : vtx[0].vout[0];
 
-    if (!Solver(txout.scriptPubKey, whichType, vSolutions))
-        return false;
-    if (whichType == TX_PUBKEY)
+    if(fProofOfStake)
     {
-        const valtype& vchPubKey = vSolutions[0];
-        CKey key;
-        if (!key.SetPubKey(vchPubKey))
-            return false;
-        if (vchBlockSig.empty())
+        const CTxOut& txout = vtx[1].vout[1];
+
+        if (!Solver(txout.scriptPubKey, whichType, vSolutions))
             return false;
-        return key.Verify(GetHash(), vchBlockSig);
+        if (whichType == TX_PUBKEY)
+        {
+            valtype& vchPubKey = vSolutions[0];
+            CKey key;
+            if (!key.SetPubKey(vchPubKey))
+                return false;
+            if (vchBlockSig.empty())
+                return false;
+            return key.Verify(GetHash(), vchBlockSig);
+        }
     }
-    return false;
-}
-
-
+    else
+    {
+        for(unsigned int i = 0; i < vtx[0].vout.size(); i++)
+        {
+            const CTxOut& txout = vtx[0].vout[i];
 
+            if (!Solver(txout.scriptPubKey, whichType, vSolutions))
+                return false;
 
+            if (whichType == TX_PUBKEY)
+            {
+                // Verify
+                valtype& vchPubKey = vSolutions[0];
+                CKey key;
+                if (!key.SetPubKey(vchPubKey))
+                    continue;
+                if (vchBlockSig.empty())
+                    continue;
+                if(!key.Verify(GetHash(), vchBlockSig))
+                    continue;
 
+                return true;
+            }
+        }
+    }
+    return false;
+}
 
 bool CheckDiskSpace(uint64 nAdditionalBytes)
 {
     uint64 nFreeBytesAvailable = filesystem::space(GetDataDir()).available;
 
-    // Check for 15MB because database could create another 10MB log file at any time
-    if (nFreeBytesAvailable < (uint64)15000000 + nAdditionalBytes)
+    // Check for nMinDiskSpace bytes (currently 50MB)
+    if (nFreeBytesAvailable < nMinDiskSpace + nAdditionalBytes)
     {
         fShutdown = true;
-        string strMessage = _("Warning: Disk space is low");
+        string strMessage = _("Warning: Disk space is low!");
         strMiscWarning = strMessage;
         printf("*** %s\n", strMessage.c_str());
-        ThreadSafeMessageBox(strMessage, "PPCoin", wxOK | wxICON_EXCLAMATION | wxMODAL);
+        uiInterface.ThreadSafeMessageBox(strMessage, "NovaCoin", CClientUIInterface::OK | CClientUIInterface::ICON_EXCLAMATION | CClientUIInterface::MODAL);
         StartShutdown();
         return false;
     }
     return true;
 }
 
+static filesystem::path BlockFilePath(unsigned int nFile)
+{
+    string strBlockFn = strprintf("blk%04u.dat", nFile);
+    return GetDataDir() / strBlockFn;
+}
+
 FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode)
 {
-    if (nFile == -1)
+    if ((nFile < 1) || (nFile == (unsigned int) -1))
         return NULL;
-    FILE* file = fopen((GetDataDir() / strprintf("blk%04d.dat", nFile)).string().c_str(), pszMode);
+    FILE* file = fopen(BlockFilePath(nFile).string().c_str(), pszMode);
     if (!file)
         return NULL;
     if (nBlockPos != 0 && !strchr(pszMode, 'a') && !strchr(pszMode, 'w'))
@@ -2198,15 +2662,15 @@ static unsigned int nCurrentBlockFile = 1;
 FILE* AppendBlockFile(unsigned int& nFileRet)
 {
     nFileRet = 0;
-    loop
+    while (true)
     {
         FILE* file = OpenBlockFile(nCurrentBlockFile, 0, "ab");
         if (!file)
             return NULL;
         if (fseek(file, 0, SEEK_END) != 0)
             return NULL;
-        // FAT32 filesize max 4GB, fseek and ftell max 2GB, so we must stay under 2GB
-        if (ftell(file) < 0x7F000000 - MAX_SIZE)
+        // FAT32 file size max 4GB, fseek and ftell max 2GB, so we must stay under 2GB
+        if (ftell(file) < (long)(0x7F000000 - MAX_SIZE))
         {
             nFileRet = nCurrentBlockFile;
             return file;
@@ -2218,16 +2682,30 @@ FILE* AppendBlockFile(unsigned int& nFileRet)
 
 bool LoadBlockIndex(bool fAllowNew)
 {
+    CBigNum bnTrustedModulus;
+
     if (fTestNet)
     {
-        hashGenesisBlock = hashGenesisBlockTestNet;
-        bnProofOfWorkLimit = CBigNum(~uint256(0) >> 28);
-        pchMessageStart[0] = 0xfa;
-        pchMessageStart[1] = 0xbf;
-        pchMessageStart[2] = 0xb5;
-        pchMessageStart[3] = 0xda;
+        pchMessageStart[0] = 0xcd;
+        pchMessageStart[1] = 0xf2;
+        pchMessageStart[2] = 0xc0;
+        pchMessageStart[3] = 0xef;
+
+        bnTrustedModulus.SetHex("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");
+        bnProofOfWorkLimit = bnProofOfWorkLimitTestNet; // 16 bits PoW target limit for testnet
+        nStakeMinAge = 2 * 60 * 60; // test net min age is 2 hours
+        nModifierInterval = 20 * 60; // test modifier interval is 20 minutes
+        nCoinbaseMaturity = 10; // test maturity is 10 blocks
+        nStakeTargetSpacing = 5 * 60; // test block spacing is 5 minutes
+    }
+    else
+    {
+        bnTrustedModulus.SetHex("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");
     }
 
+    // Set up the Zerocoin Params object
+    ZCParams = new libzerocoin::Params(bnTrustedModulus);
+
     //
     // Load block index
     //
@@ -2244,44 +2722,44 @@ bool LoadBlockIndex(bool fAllowNew)
         if (!fAllowNew)
             return false;
 
-        // 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 = "MarketWatch 07/Nov/2011 Gold tops $1,790 to end at over six-week high";
+
+        // MainNet:
+
+        //CBlock(hash=00000a060336cbb72fe969666d337b87198b1add2abaa59cca226820b32933a4, ver=1, hashPrevBlock=0000000000000000000000000000000000000000000000000000000000000000, hashMerkleRoot=4cb33b3b6a861dcbc685d3e614a9cafb945738d6833f182855679f2fad02057b, nTime=1360105017, nBits=1e0fffff, nNonce=1575379, vtx=1, vchBlockSig=)
+        //  Coinbase(hash=4cb33b3b6a, nTime=1360105017, ver=1, vin.size=1, vout.size=1, nLockTime=0)
+        //    CTxIn(COutPoint(0000000000, 4294967295), coinbase 04ffff001d020f274468747470733a2f2f626974636f696e74616c6b2e6f72672f696e6465782e7068703f746f7069633d3133343137392e6d736731353032313936236d736731353032313936)
+        //    CTxOut(empty)
+        //  vMerkleTree: 4cb33b3b6a
+
+        // TestNet:
+
+        //CBlock(hash=0000c763e402f2436da9ed36c7286f62c3f6e5dbafce9ff289bd43d7459327eb, ver=1, hashPrevBlock=0000000000000000000000000000000000000000000000000000000000000000, hashMerkleRoot=4cb33b3b6a861dcbc685d3e614a9cafb945738d6833f182855679f2fad02057b, nTime=1360105017, nBits=1f00ffff, nNonce=46534, vtx=1, vchBlockSig=)
+        //  Coinbase(hash=4cb33b3b6a, nTime=1360105017, ver=1, vin.size=1, vout.size=1, nLockTime=0)
+        //    CTxIn(COutPoint(0000000000, 4294967295), coinbase 04ffff001d020f274468747470733a2f2f626974636f696e74616c6b2e6f72672f696e6465782e7068703f746f7069633d3133343137392e6d736731353032313936236d736731353032313936)
+        //    CTxOut(empty)
+        //  vMerkleTree: 4cb33b3b6a
+
+        const char* pszTimestamp = "https://bitcointalk.org/index.php?topic=134179.msg1502196#msg1502196";
         CTransaction txNew;
-        txNew.nTime = 1339538219;
+        txNew.nTime = 1360105017;
         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.vin[0].scriptSig = CScript() << 486604799 << CBigNum(9999) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
         txNew.vout[0].SetEmpty();
         CBlock block;
         block.vtx.push_back(txNew);
         block.hashPrevBlock = 0;
         block.hashMerkleRoot = block.BuildMerkleTree();
         block.nVersion = 1;
-        block.nTime    = 1339540307;
+        block.nTime    = 1360105017;
         block.nBits    = bnProofOfWorkLimit.GetCompact();
-        block.nNonce   = 1281822831;
-
-        if (fTestNet)
-        {
-            block.nTime    = 1296688602;
-            block.nBits    = 0x1d07fff8;
-            block.nNonce   = 384568319;
-        }
+        block.nNonce   = !fTestNet ? 1575379 : 46534;
 
         //// debug print
-        printf("%s\n", block.GetHash().ToString().c_str());
-        printf("%s\n", hashGenesisBlock.ToString().c_str());
-        printf("%s\n", block.hashMerkleRoot.ToString().c_str());
-        assert(block.hashMerkleRoot == uint256("0x1557f46a17fcf8843dbe4c0c0edfd1d17eeff2c3c48d73a59d11f5d176e4b54d"));
+        assert(block.hashMerkleRoot == uint256("0x4cb33b3b6a861dcbc685d3e614a9cafb945738d6833f182855679f2fad02057b"));
         block.print();
-        assert(block.GetHash() == hashGenesisBlock);
+        assert(block.GetHash() == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet));
         assert(block.CheckBlock());
 
         // Start new block file
@@ -2293,7 +2771,7 @@ bool LoadBlockIndex(bool fAllowNew)
             return error("LoadBlockIndex() : genesis block not accepted");
 
         // ppcoin: initialize synchronized checkpoint
-        if (!Checkpoints::WriteSyncCheckpoint(hashGenesisBlock))
+        if (!Checkpoints::WriteSyncCheckpoint((!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet)))
             return error("LoadBlockIndex() : failed to init sync checkpoint");
     }
 
@@ -2309,10 +2787,13 @@ bool LoadBlockIndex(bool fAllowNew)
                 return error("LoadBlockIndex() : failed to write new checkpoint master key to db");
             if (!txdb.TxnCommit())
                 return error("LoadBlockIndex() : failed to commit new checkpoint master key to db");
-            if (!Checkpoints::ResetSyncCheckpoint())
+            if ((!fTestNet) && !Checkpoints::ResetSyncCheckpoint())
                 return error("LoadBlockIndex() : failed to reset sync-checkpoint");
         }
+#ifndef USE_LEVELDB
         txdb.Close();
+#endif
+
     }
 
     return true;
@@ -2322,7 +2803,7 @@ bool LoadBlockIndex(bool fAllowNew)
 
 void PrintBlockTree()
 {
-    // precompute tree structure
+    // pre-compute tree structure
     map<CBlockIndex*, vector<CBlockIndex*> > mapNext;
     for (map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.begin(); mi != mapBlockIndex.end(); ++mi)
     {
@@ -2365,18 +2846,19 @@ void PrintBlockTree()
         // print item
         CBlock block;
         block.ReadFromDisk(pindex);
-        printf("%d (%u,%u) %s  %08lx  %s  tx %d",
+        printf("%d (%u,%u) %s  %08x  %s  mint %7s  tx %"PRIszu"",
             pindex->nHeight,
             pindex->nFile,
             pindex->nBlockPos,
-            block.GetHash().ToString().substr(0,20).c_str(),
+            block.GetHash().ToString().c_str(),
             block.nBits,
-            DateTimeStrFormat(block.GetBlockTime()).c_str(),
+            DateTimeStrFormat("%x %H:%M:%S", block.GetBlockTime()).c_str(),
+            FormatMoney(pindex->nMint).c_str(),
             block.vtx.size());
 
         PrintWallets(block);
 
-        // put the main timechain first
+        // put the main time-chain first
         vector<CBlockIndex*>& vNext = mapNext[pindex];
         for (unsigned int i = 0; i < vNext.size(); i++)
         {
@@ -2393,31 +2875,83 @@ void PrintBlockTree()
     }
 }
 
+bool LoadExternalBlockFile(FILE* fileIn)
+{
+    int64 nStart = GetTimeMillis();
 
-
-
-
-
-
-
-
+    int nLoaded = 0;
+    {
+        LOCK(cs_main);
+        try {
+            CAutoFile blkdat(fileIn, SER_DISK, CLIENT_VERSION);
+            unsigned int nPos = 0;
+            while (nPos != (unsigned int)-1 && blkdat.good() && !fRequestShutdown)
+            {
+                unsigned char pchData[65536];
+                do {
+                    fseek(blkdat, nPos, SEEK_SET);
+                    int nRead = fread(pchData, 1, sizeof(pchData), blkdat);
+                    if (nRead <= 8)
+                    {
+                        nPos = (unsigned int)-1;
+                        break;
+                    }
+                    void* nFind = memchr(pchData, pchMessageStart[0], nRead+1-sizeof(pchMessageStart));
+                    if (nFind)
+                    {
+                        if (memcmp(nFind, pchMessageStart, sizeof(pchMessageStart))==0)
+                        {
+                            nPos += ((unsigned char*)nFind - pchData) + sizeof(pchMessageStart);
+                            break;
+                        }
+                        nPos += ((unsigned char*)nFind - pchData) + 1;
+                    }
+                    else
+                        nPos += sizeof(pchData) - sizeof(pchMessageStart) + 1;
+                } while(!fRequestShutdown);
+                if (nPos == (unsigned int)-1)
+                    break;
+                fseek(blkdat, nPos, SEEK_SET);
+                unsigned int nSize;
+                blkdat >> nSize;
+                if (nSize > 0 && nSize <= MAX_BLOCK_SIZE)
+                {
+                    CBlock block;
+                    blkdat >> block;
+                    if (ProcessBlock(NULL,&block))
+                    {
+                        nLoaded++;
+                        nPos += 4 + nSize;
+                    }
+                }
+            }
+        }
+        catch (std::exception &e) {
+            printf("%s() : Deserialize or I/O error caught during load\n",
+                   __PRETTY_FUNCTION__);
+        }
+    }
+    printf("Loaded %i blocks from external file in %"PRI64d"ms\n", nLoaded, GetTimeMillis() - nStart);
+    return nLoaded > 0;
+}
 
 //////////////////////////////////////////////////////////////////////////////
 //
 // CAlert
 //
 
-map<uint256, CAlert> mapAlerts;
-CCriticalSection cs_mapAlerts;
+extern map<uint256, CAlert> mapAlerts;
+extern CCriticalSection cs_mapAlerts;
 
-static string strMintMessage = _("Info: Minting suspended due to locked wallet."); 
-static string strMintWarning;
+extern string strMintMessage;
+extern string strMintWarning;
 
 string GetWarnings(string strFor)
 {
     int nPriority = 0;
     string strStatusBar;
     string strRPC;
+
     if (GetBoolArg("-testsafemode"))
         strRPC = "test";
 
@@ -2435,19 +2969,21 @@ string GetWarnings(string strFor)
         strStatusBar = strMiscWarning;
     }
 
-    // ppcoin: should not enter safe mode for longer invalid chain
-    // ppcoin: if sync-checkpoint too old enter safe mode
-    if (Checkpoints::IsMatureSyncCheckpoint())
+    // * Should not enter safe mode for longer invalid chain
+    // * If sync-checkpoint is too old do not enter safe mode
+    // * Display warning only in the STRICT mode
+    if (CheckpointsMode == Checkpoints::STRICT && Checkpoints::IsSyncCheckpointTooOld(60 * 60 * 24 * 10) &&
+        !fTestNet && !IsInitialBlockDownload())
     {
-        nPriority = 2000;
-        strStatusBar = strRPC = "WARNING: Checkpoint is too old. Wait for block chain to download, or notify developers of the issue.";
+        nPriority = 100;
+        strStatusBar = _("WARNING: Checkpoint is too old. Wait for block chain to download, or notify developers.");
     }
 
     // ppcoin: if detected invalid checkpoint enter safe mode
     if (Checkpoints::hashInvalidCheckpoint != 0)
     {
         nPriority = 3000;
-        strStatusBar = strRPC = "WARNING: Invalid checkpoint found! Displayed transactions may not be correct! You may need to upgrade, or notify developers of the issue.";
+        strStatusBar = strRPC = _("WARNING: Invalid checkpoint found! Displayed transactions may not be correct! You may need to upgrade, or notify developers.");
     }
 
     // Alerts
@@ -2461,7 +2997,7 @@ string GetWarnings(string strFor)
                 nPriority = alert.nPriority;
                 strStatusBar = alert.strStatusBar;
                 if (nPriority > 1000)
-                    strRPC = strStatusBar;  // ppcoin: safe mode for high alert
+                    strRPC = strStatusBar;
             }
         }
     }
@@ -2474,53 +3010,6 @@ string GetWarnings(string strFor)
     return "error";
 }
 
-bool CAlert::ProcessAlert()
-{
-    if (!CheckSignature())
-        return false;
-    if (!IsInEffect())
-        return false;
-
-    {
-        LOCK(cs_mapAlerts);
-        // Cancel previous alerts
-        for (map<uint256, CAlert>::iterator mi = mapAlerts.begin(); mi != mapAlerts.end();)
-        {
-            const CAlert& alert = (*mi).second;
-            if (Cancels(alert))
-            {
-                printf("cancelling alert %d\n", alert.nID);
-                mapAlerts.erase(mi++);
-            }
-            else if (!alert.IsInEffect())
-            {
-                printf("expiring alert %d\n", alert.nID);
-                mapAlerts.erase(mi++);
-            }
-            else
-                mi++;
-        }
-
-        // Check if this alert has been cancelled
-        BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
-        {
-            const CAlert& alert = item.second;
-            if (alert.Cancels(*this))
-            {
-                printf("alert already cancelled by %d\n", alert.nID);
-                return false;
-            }
-        }
-
-        // Add to mapAlerts
-        mapAlerts.insert(make_pair(GetHash(), *this));
-    }
-
-    printf("accepted alert %d, AppliesToMe()=%d\n", nID, AppliesToMe());
-    MainFrameRepaint();
-    return true;
-}
-
 
 
 
@@ -2562,29 +3051,22 @@ bool static AlreadyHave(CTxDB& txdb, 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
+// 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] = { 0xe4, 0xe8, 0xe9, 0xe5 };
 
 bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
 {
-    static map<CService, vector<unsigned char> > mapReuseKey;
+    static map<CService, CPubKey> mapReuseKey;
     RandAddSeedPerfmon();
-    if (fDebug) {
-        printf("%s ", DateTimeStrFormat(GetTime()).c_str());
-        printf("received: %s (%d bytes)\n", strCommand.c_str(), vRecv.size());
-    }
+    if (fDebug)
+        printf("received: %s (%"PRIszu" bytes)\n", strCommand.c_str(), vRecv.size());
     if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
     {
         printf("dropmessagestest DROPPING RECV MESSAGE\n");
         return true;
     }
 
-
-
-
-
     if (strCommand == "version")
     {
         // Each connection can only send one version message
@@ -2617,6 +3099,12 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         if (!vRecv.empty())
             vRecv >> pfrom->nStartingHeight;
 
+        if (pfrom->fInbound && addrMe.IsRoutable())
+        {
+            pfrom->addrLocal = addrMe;
+            SeenLocal(addrMe);
+        }
+
         // Disconnect if we connected to ourself
         if (nNonce == nLocalHostNonce && nNonce > 1)
         {
@@ -2625,7 +3113,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
             return true;
         }
 
-        // ppcoin: record my external IP reported by peer
+        // record my external IP reported by peer
         if (addrFrom.IsRoutable() && addrMe.IsRoutable())
             addrSeenByPeer = addrMe;
 
@@ -2644,16 +3132,15 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         if (!pfrom->fInbound)
         {
             // Advertise our address
-            if (!fNoListen && !fUseProxy && addrLocalHost.IsRoutable() &&
-                !IsInitialBlockDownload())
+            if (!fNoListen && !IsInitialBlockDownload())
             {
-                CAddress addr(addrLocalHost);
-                addr.nTime = GetAdjustedTime();
-                pfrom->PushAddress(addr);
+                CAddress addr = GetLocalAddress(&pfrom->addr);
+                if (addr.IsRoutable())
+                    pfrom->PushAddress(addr);
             }
 
             // Get recent addresses
-            if (pfrom->nVersion >= CADDR_TIME_VERSION || addrman.size() < 1000)
+            if (pfrom->fOneShot || pfrom->nVersion >= CADDR_TIME_VERSION || addrman.size() < 1000)
             {
                 pfrom->PushMessage("getaddr");
                 pfrom->fGetAddr = true;
@@ -2669,7 +3156,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
 
         // Ask the first connected node for block updates
         static int nAskedForBlocks = 0;
-        if (!pfrom->fClient &&
+        if (!pfrom->fClient && !pfrom->fOneShot &&
+            (pfrom->nStartingHeight > (nBestHeight - 144)) &&
             (pfrom->nVersion < NOBLKS_VERSION_START ||
              pfrom->nVersion >= NOBLKS_VERSION_END) &&
              (nAskedForBlocks < 1 || vNodes.size() <= 1))
@@ -2685,7 +3173,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
                 item.second.RelayTo(pfrom);
         }
 
-        // ppcoin: relay sync-checkpoint
+        // Relay sync-checkpoint
         {
             LOCK(Checkpoints::cs_hashSyncCheckpoint);
             if (!Checkpoints::checkpointMessage.IsNull())
@@ -2694,7 +3182,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
 
         pfrom->fSuccessfullyConnected = true;
 
-        printf("version message: version %d, blocks=%d\n", pfrom->nVersion, pfrom->nStartingHeight);
+        printf("receive version message: version %d, blocks=%d, us=%s, them=%s, peer=%s\n", pfrom->nVersion, pfrom->nStartingHeight, addrMe.ToString().c_str(), addrFrom.ToString().c_str(), pfrom->addr.ToString().c_str());
 
         cPeerBlockCounts.input(pfrom->nStartingHeight);
 
@@ -2729,22 +3217,21 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         if (vAddr.size() > 1000)
         {
             pfrom->Misbehaving(20);
-            return error("message addr size() = %d", vAddr.size());
+            return error("message addr size() = %"PRIszu"", vAddr.size());
         }
 
         // Store the new addresses
+        vector<CAddress> vAddrOk;
         int64 nNow = GetAdjustedTime();
         int64 nSince = nNow - 10 * 60;
         BOOST_FOREACH(CAddress& addr, vAddr)
         {
             if (fShutdown)
                 return true;
-            // ignore IPv6 for now, since it isn't implemented anyway
-            if (!addr.IsIPv4())
-                continue;
             if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60)
                 addr.nTime = nNow - 5 * 24 * 60 * 60;
             pfrom->AddAddressKnown(addr);
+            bool fReachable = IsReachable(addr);
             if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable())
             {
                 // Relay to a limited number of other nodes
@@ -2755,7 +3242,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
                     static uint256 hashSalt;
                     if (hashSalt == 0)
                         hashSalt = GetRandHash();
-                    int64 hashAddr = addr.GetHash();
+                    uint64 hashAddr = addr.GetHash();
                     uint256 hashRand = hashSalt ^ (hashAddr<<32) ^ ((GetTime()+hashAddr)/(24*60*60));
                     hashRand = Hash(BEGIN(hashRand), END(hashRand));
                     multimap<uint256, CNode*> mapMix;
@@ -2769,26 +3256,30 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
                         hashKey = Hash(BEGIN(hashKey), END(hashKey));
                         mapMix.insert(make_pair(hashKey, pnode));
                     }
-                    int nRelayNodes = 2;
+                    int nRelayNodes = fReachable ? 2 : 1; // limited relaying of addresses outside our network(s)
                     for (multimap<uint256, CNode*>::iterator mi = mapMix.begin(); mi != mapMix.end() && nRelayNodes-- > 0; ++mi)
                         ((*mi).second)->PushAddress(addr);
                 }
             }
+            // Do not store addresses outside our network
+            if (fReachable)
+                vAddrOk.push_back(addr);
         }
-        addrman.Add(vAddr, pfrom->addr, 2 * 60 * 60);
+        addrman.Add(vAddrOk, pfrom->addr, 2 * 60 * 60);
         if (vAddr.size() < 1000)
             pfrom->fGetAddr = false;
+        if (pfrom->fOneShot)
+            pfrom->fDisconnect = true;
     }
 
-
     else if (strCommand == "inv")
     {
         vector<CInv> vInv;
         vRecv >> vInv;
-        if (vInv.size() > 50000)
+        if (vInv.size() > MAX_INV_SZ)
         {
             pfrom->Misbehaving(20);
-            return error("message inv size() = %d", vInv.size());
+            return error("message inv size() = %"PRIszu"", vInv.size());
         }
 
         // find last block in inv vector
@@ -2820,7 +3311,6 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
                 // In case we are on a very long side-chain, it is possible that we already have
                 // the last block in an inv bundle sent in response to getblocks. Try to detect
                 // this situation and push another getblocks to continue.
-                std::vector<CInv> vGetData(1,inv);
                 pfrom->PushGetBlocks(mapBlockIndex[inv.hash], uint256(0));
                 if (fDebug)
                     printf("force request: %s\n", inv.ToString().c_str());
@@ -2836,17 +3326,21 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
     {
         vector<CInv> vInv;
         vRecv >> vInv;
-        if (vInv.size() > 50000)
+        if (vInv.size() > MAX_INV_SZ)
         {
             pfrom->Misbehaving(20);
-            return error("message getdata size() = %d", vInv.size());
+            return error("message getdata size() = %"PRIszu"", vInv.size());
         }
 
+        if (fDebugNet || (vInv.size() != 1))
+            printf("received getdata (%"PRIszu" invsz)\n", vInv.size());
+
         BOOST_FOREACH(const CInv& inv, vInv)
         {
             if (fShutdown)
                 return true;
-            printf("received getdata for: %s\n", inv.ToString().c_str());
+            if (fDebugNet || (vInv.size() == 1))
+                printf("received getdata for: %s\n", inv.ToString().c_str());
 
             if (inv.type == MSG_BLOCK)
             {
@@ -2861,9 +3355,6 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
                     // Trigger them to send a getblocks request for the next batch of inventory
                     if (inv.hash == pfrom->hashContinue)
                     {
-                        // Bypass PushInventory, this must send even if redundant,
-                        // and we want it right after the last block so they don't
-                        // wait for other stuff first.
                         // ppcoin: send latest proof-of-work block to allow the
                         // download node to accept as orphan (proof-of-stake 
                         // block might be rejected by stake connection check)
@@ -2877,11 +3368,24 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
             else if (inv.IsKnownType())
             {
                 // Send stream from relay memory
+                bool pushed = false;
                 {
                     LOCK(cs_mapRelay);
                     map<CInv, CDataStream>::iterator mi = mapRelay.find(inv);
-                    if (mi != mapRelay.end())
+                    if (mi != mapRelay.end()) {
                         pfrom->PushMessage(inv.GetCommand(), (*mi).second);
+                        pushed = true;
+                    }
+                }
+                if (!pushed && inv.type == MSG_TX) {
+                    LOCK(mempool.cs);
+                    if (mempool.exists(inv.hash)) {
+                        CTransaction tx = mempool.lookup(inv.hash);
+                        CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
+                        ss.reserve(1000);
+                        ss << tx;
+                        pfrom->PushMessage("tx", ss);
+                    }
                 }
             }
 
@@ -2903,35 +3407,44 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         // Send the rest of the chain
         if (pindex)
             pindex = pindex->pnext;
-        int nLimit = 500 + locator.GetDistanceBack();
-        unsigned int nBytes = 0;
+        int nLimit = 500;
         printf("getblocks %d to %s limit %d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str(), nLimit);
         for (; pindex; pindex = pindex->pnext)
         {
             if (pindex->GetBlockHash() == hashStop)
             {
-                printf("  getblocks stopping at %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
+                printf("  getblocks stopping at %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str());
                 // ppcoin: tell downloading node about the latest block if it's
                 // without risk being rejected due to stake connection check
-                if (hashStop != hashBestChain && pindex->GetBlockTime() + STAKE_MIN_AGE > pindexBest->GetBlockTime())
+                if (hashStop != hashBestChain && pindex->GetBlockTime() + nStakeMinAge > pindexBest->GetBlockTime())
                     pfrom->PushInventory(CInv(MSG_BLOCK, hashBestChain));
                 break;
             }
             pfrom->PushInventory(CInv(MSG_BLOCK, pindex->GetBlockHash()));
-            CBlock block;
-            block.ReadFromDisk(pindex, true);
-            nBytes += block.GetSerializeSize(SER_NETWORK, PROTOCOL_VERSION);
-            if (--nLimit <= 0 || nBytes >= SendBufferSize()/2)
+            if (--nLimit <= 0)
             {
                 // When this block is requested, we'll send an inv that'll make them
                 // getblocks the next batch of inventory.
-                printf("  getblocks stopping at limit %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
+                printf("  getblocks stopping at limit %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str());
                 pfrom->hashContinue = pindex->GetBlockHash();
                 break;
             }
         }
     }
+    else if (strCommand == "checkpoint")
+    {
+        CSyncCheckpoint checkpoint;
+        vRecv >> checkpoint;
 
+        if (checkpoint.ProcessSyncCheckpoint(pfrom))
+        {
+            // Relay
+            pfrom->hashCheckpointKnown = checkpoint.hashCheckpoint;
+            LOCK(cs_vNodes);
+            BOOST_FOREACH(CNode* pnode, vNodes)
+                checkpoint.RelayTo(pnode);
+        }
+    }
 
     else if (strCommand == "getheaders")
     {
@@ -2985,7 +3498,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         if (tx.AcceptToMemoryPool(txdb, true, &fMissingInputs))
         {
             SyncWithWallets(tx, NULL, true);
-            RelayMessage(inv, vMsg);
+            RelayTransaction(tx, inv.hash);
             mapAlreadyAskedFor.erase(inv);
             vWorkQueue.push_back(inv.hash);
             vEraseQueue.push_back(inv.hash);
@@ -2994,30 +3507,28 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
             for (unsigned int i = 0; i < vWorkQueue.size(); i++)
             {
                 uint256 hashPrev = vWorkQueue[i];
-                for (map<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev[hashPrev].begin();
+                for (set<uint256>::iterator mi = mapOrphanTransactionsByPrev[hashPrev].begin();
                      mi != mapOrphanTransactionsByPrev[hashPrev].end();
                      ++mi)
                 {
-                    const CDataStream& vMsg = *((*mi).second);
-                    CTransaction tx;
-                    CDataStream(vMsg) >> tx;
-                    CInv inv(MSG_TX, tx.GetHash());
+                    const uint256& orphanTxHash = *mi;
+                    CTransaction& orphanTx = mapOrphanTransactions[orphanTxHash];
                     bool fMissingInputs2 = false;
 
-                    if (tx.AcceptToMemoryPool(txdb, true, &fMissingInputs2))
+                    if (orphanTx.AcceptToMemoryPool(txdb, true, &fMissingInputs2))
                     {
-                        printf("   accepted orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
+                        printf("   accepted orphan tx %s\n", orphanTxHash.ToString().substr(0,10).c_str());
                         SyncWithWallets(tx, NULL, true);
-                        RelayMessage(inv, vMsg);
-                        mapAlreadyAskedFor.erase(inv);
-                        vWorkQueue.push_back(inv.hash);
-                        vEraseQueue.push_back(inv.hash);
+                        RelayTransaction(orphanTx, orphanTxHash);
+                        mapAlreadyAskedFor.erase(CInv(MSG_TX, orphanTxHash));
+                        vWorkQueue.push_back(orphanTxHash);
+                        vEraseQueue.push_back(orphanTxHash);
                     }
                     else if (!fMissingInputs2)
                     {
                         // invalid orphan
-                        vEraseQueue.push_back(inv.hash);
-                        printf("   removed invalid orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
+                        vEraseQueue.push_back(orphanTxHash);
+                        printf("   removed invalid orphan tx %s\n", orphanTxHash.ToString().substr(0,10).c_str());
                     }
                 }
             }
@@ -3027,7 +3538,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         }
         else if (fMissingInputs)
         {
-            AddOrphanTx(vMsg);
+            AddOrphanTx(tx);
 
             // DoS prevention: do not allow mapOrphanTransactions to grow unbounded
             unsigned int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
@@ -3042,11 +3553,12 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
     {
         CBlock block;
         vRecv >> block;
+        uint256 hashBlock = block.GetHash();
 
-        printf("received block %s\n", block.GetHash().ToString().substr(0,20).c_str());
+        printf("received block %s\n", hashBlock.ToString().substr(0,20).c_str());
         // block.print();
 
-        CInv inv(MSG_BLOCK, block.GetHash());
+        CInv inv(MSG_BLOCK, hashBlock);
         pfrom->AddInventoryKnown(inv);
 
         if (ProcessBlock(pfrom, &block))
@@ -3057,10 +3569,29 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
 
     else if (strCommand == "getaddr")
     {
+        // Don't return addresses older than nCutOff timestamp
+        int64 nCutOff = GetTime() - (nNodeLifespan * 24 * 60 * 60);
         pfrom->vAddrToSend.clear();
         vector<CAddress> vAddr = addrman.GetAddr();
         BOOST_FOREACH(const CAddress &addr, vAddr)
-            pfrom->PushAddress(addr);
+            if(addr.nTime > nCutOff)
+                pfrom->PushAddress(addr);
+    }
+
+
+    else if (strCommand == "mempool")
+    {
+        std::vector<uint256> vtxid;
+        mempool.queryHashes(vtxid);
+        vector<CInv> vInv;
+        for (unsigned int i = 0; i < vtxid.size(); i++) {
+            CInv inv(MSG_TX, vtxid[i]);
+            vInv.push_back(inv);
+            if (i == (MAX_INV_SZ - 1))
+                    break;
+        }
+        if (vInv.size() > 0)
+            pfrom->PushMessage("inv", vInv);
     }
 
 
@@ -3138,32 +3669,31 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         CAlert alert;
         vRecv >> alert;
 
-        if (alert.ProcessAlert())
+        uint256 alertHash = alert.GetHash();
+        if (pfrom->setKnown.count(alertHash) == 0)
         {
-            // Relay
-            pfrom->setKnown.insert(alert.GetHash());
+            if (alert.ProcessAlert())
             {
-                LOCK(cs_vNodes);
-                BOOST_FOREACH(CNode* pnode, vNodes)
-                    alert.RelayTo(pnode);
+                // Relay
+                pfrom->setKnown.insert(alertHash);
+                {
+                    LOCK(cs_vNodes);
+                    BOOST_FOREACH(CNode* pnode, vNodes)
+                        alert.RelayTo(pnode);
+                }
+            }
+            else {
+                // Small DoS penalty so peers that send us lots of
+                // duplicate/expired/invalid-signature/whatever alerts
+                // eventually get banned.
+                // This isn't a Misbehaving(100) (immediate ban) because the
+                // peer might be an older or different implementation with
+                // a different signature key, etc.
+                pfrom->Misbehaving(10);
             }
         }
     }
 
-    else if (strCommand == "checkpoint")
-    {
-        CSyncCheckpoint checkpoint;
-        vRecv >> checkpoint;
-
-        if (checkpoint.ProcessSyncCheckpoint(pfrom))
-        {
-            // Relay
-            pfrom->hashCheckpointKnown = checkpoint.hashCheckpoint;
-            LOCK(cs_vNodes);
-            BOOST_FOREACH(CNode* pnode, vNodes)
-                checkpoint.RelayTo(pnode);
-        }
-    }
 
     else
     {
@@ -3197,8 +3727,12 @@ bool ProcessMessages(CNode* pfrom)
     //  (x) data
     //
 
-    loop
+    while (true)
     {
+        // Don't bother if send buffer is too full to respond anyway
+        if (pfrom->vSend.size() >= SendBufferSize())
+            break;
+
         // Scan for message start
         CDataStream::iterator pstart = search(vRecv.begin(), vRecv.end(), BEGIN(pchMessageStart), END(pchMessageStart));
         int nHeaderSize = vRecv.GetSerializeSize(CMessageHeader());
@@ -3212,7 +3746,7 @@ bool ProcessMessages(CNode* pfrom)
             break;
         }
         if (pstart - vRecv.begin() > 0)
-            printf("\n\nPROCESSMESSAGE SKIPPED %d BYTES\n\n", pstart - vRecv.begin());
+            printf("\n\nPROCESSMESSAGE SKIPPED %"PRIpdd" BYTES\n\n", pstart - vRecv.begin());
         vRecv.erase(vRecv.begin(), pstart);
 
         // Read header
@@ -3270,12 +3804,12 @@ bool ProcessMessages(CNode* pfrom)
         {
             if (strstr(e.what(), "end of data"))
             {
-                // Allow exceptions from underlength message on vRecv
+                // Allow exceptions from under-length message on vRecv
                 printf("ProcessMessages(%s, %u bytes) : Exception '%s' caught, normally caused by a message being shorter than its stated length\n", strCommand.c_str(), nMessageSize, e.what());
             }
             else if (strstr(e.what(), "size too large"))
             {
-                // Allow exceptions from overlong size
+                // Allow exceptions from over-long size
                 printf("ProcessMessages(%s, %u bytes) : Exception '%s' caught\n", strCommand.c_str(), nMessageSize, e.what());
             }
             else
@@ -3332,11 +3866,11 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
                         pnode->setAddrKnown.clear();
 
                     // Rebroadcast our address
-                    if (!fNoListen && !fUseProxy && addrLocalHost.IsRoutable())
+                    if (!fNoListen)
                     {
-                        CAddress addr(addrLocalHost);
-                        addr.nTime = GetAdjustedTime();
-                        pnode->PushAddress(addr);
+                        CAddress addr = GetLocalAddress(&pnode->addr);
+                        if (addr.IsRoutable())
+                            pnode->PushAddress(addr);
                     }
                 }
             }
@@ -3439,15 +3973,16 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
             const CInv& inv = (*pto->mapAskFor.begin()).second;
             if (!AlreadyHave(txdb, inv))
             {
-                printf("sending getdata: %s\n", inv.ToString().c_str());
+                if (fDebugNet)
+                    printf("sending getdata: %s\n", inv.ToString().c_str());
                 vGetData.push_back(inv);
                 if (vGetData.size() >= 1000)
                 {
                     pto->PushMessage("getdata", vGetData);
                     vGetData.clear();
                 }
+                mapAlreadyAskedFor[inv] = nNow;
             }
-            mapAlreadyAskedFor[inv] = nNow;
             pto->mapAskFor.erase(pto->mapAskFor.begin());
         }
         if (!vGetData.empty())
@@ -3456,656 +3991,3 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
     }
     return true;
 }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-//////////////////////////////////////////////////////////////////////////////
-//
-// BitcoinMiner
-//
-
-int static FormatHashBlocks(void* pbuffer, unsigned int len)
-{
-    unsigned char* pdata = (unsigned char*)pbuffer;
-    unsigned int blocks = 1 + ((len + 8) / 64);
-    unsigned char* pend = pdata + 64 * blocks;
-    memset(pdata + len, 0, 64 * blocks - len);
-    pdata[len] = 0x80;
-    unsigned int bits = len * 8;
-    pend[-1] = (bits >> 0) & 0xff;
-    pend[-2] = (bits >> 8) & 0xff;
-    pend[-3] = (bits >> 16) & 0xff;
-    pend[-4] = (bits >> 24) & 0xff;
-    return blocks;
-}
-
-static const unsigned int pSHA256InitState[8] =
-{0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
-
-void SHA256Transform(void* pstate, void* pinput, const void* pinit)
-{
-    SHA256_CTX ctx;
-    unsigned char data[64];
-
-    SHA256_Init(&ctx);
-
-    for (int i = 0; i < 16; i++)
-        ((uint32_t*)data)[i] = ByteReverse(((uint32_t*)pinput)[i]);
-
-    for (int i = 0; i < 8; i++)
-        ctx.h[i] = ((uint32_t*)pinit)[i];
-
-    SHA256_Update(&ctx, data, sizeof(data));
-    for (int i = 0; i < 8; i++)
-        ((uint32_t*)pstate)[i] = ctx.h[i];
-}
-
-//
-// ScanHash scans nonces looking for a hash with at least some zero bits.
-// It operates on big endian data.  Caller does the byte reversing.
-// All input buffers are 16-byte aligned.  nNonce is usually preserved
-// between calls, but periodically or if nNonce is 0xffff0000 or above,
-// the block is rebuilt and nNonce starts over at zero.
-//
-unsigned int static ScanHash_CryptoPP(char* pmidstate, char* pdata, char* phash1, char* phash, unsigned int& nHashesDone)
-{
-    unsigned int& nNonce = *(unsigned int*)(pdata + 12);
-    for (;;)
-    {
-        // Crypto++ SHA-256
-        // Hash pdata using pmidstate as the starting state into
-        // preformatted buffer phash1, then hash phash1 into phash
-        nNonce++;
-        SHA256Transform(phash1, pdata, pmidstate);
-        SHA256Transform(phash, phash1, pSHA256InitState);
-
-        // Return the nonce if the hash has at least some zero bits,
-        // caller will check if it has enough to reach the target
-        if (((unsigned short*)phash)[14] == 0)
-            return nNonce;
-
-        // If nothing found after trying for a while, return -1
-        if ((nNonce & 0xffff) == 0)
-        {
-            nHashesDone = 0xffff+1;
-            return (unsigned int) -1;
-        }
-    }
-}
-
-// Some explaining would be appreciated
-class COrphan
-{
-public:
-    CTransaction* ptx;
-    set<uint256> setDependsOn;
-    double dPriority;
-
-    COrphan(CTransaction* ptxIn)
-    {
-        ptx = ptxIn;
-        dPriority = 0;
-    }
-
-    void print() const
-    {
-        printf("COrphan(hash=%s, dPriority=%.1f)\n", ptx->GetHash().ToString().substr(0,10).c_str(), dPriority);
-        BOOST_FOREACH(uint256 hash, setDependsOn)
-            printf("   setDependsOn %s\n", hash.ToString().substr(0,10).c_str());
-    }
-};
-
-
-uint64 nLastBlockTx = 0;
-uint64 nLastBlockSize = 0;
-
-// CreateNewBlock:
-//   fProofOfStake: try (best effort) to make a proof-of-stake block
-CBlock* CreateNewBlock(CWallet* pwallet, bool fProofOfStake)
-{
-    CReserveKey reservekey(pwallet);
-
-    // Create new block
-    auto_ptr<CBlock> pblock(new CBlock());
-    if (!pblock.get())
-        return NULL;
-
-    // Create coinbase tx
-    CTransaction txNew;
-    txNew.vin.resize(1);
-    txNew.vin[0].prevout.SetNull();
-    txNew.vout.resize(1);
-    txNew.vout[0].scriptPubKey << reservekey.GetReservedKey() << OP_CHECKSIG;
-
-    // Add our coinbase tx as first transaction
-    pblock->vtx.push_back(txNew);
-
-    // ppcoin: if coinstake available add coinstake tx
-    static unsigned int nLastCoinStakeCheckTime = GetAdjustedTime() - nMaxClockDrift / 2;  // only initialized at startup
-    CBlockIndex* pindexPrev = pindexBest;
-
-    if (fProofOfStake)  // attemp to find a coinstake
-    {
-        while (nLastCoinStakeCheckTime < GetAdjustedTime())
-        {
-            pindexPrev = pindexBest;  // get best block again to avoid getting stale
-            pblock->nBits = GetNextTargetRequired(pindexPrev, true);
-            CTransaction txCoinStake;
-            {
-                static CCriticalSection cs;
-                LOCK(cs);
-                // mining may have been suspended for a while so 
-                // need to take max to satisfy the timestamp protocol
-                nLastCoinStakeCheckTime++;
-                nLastCoinStakeCheckTime = max(nLastCoinStakeCheckTime, (unsigned int) (GetAdjustedTime() - nMaxClockDrift / 2));
-                txCoinStake.nTime = nLastCoinStakeCheckTime;
-            }
-            if (pwallet->CreateCoinStake(pblock->nBits, txCoinStake))
-            {
-                pblock->vtx.push_back(txCoinStake);
-                pblock->vtx[0].vout[0].SetEmpty();
-                break;
-            }
-        }
-    }
-
-    pblock->nBits = GetNextTargetRequired(pindexPrev, pblock->IsProofOfStake());
-
-    // Collect memory pool transactions into the block
-    int64 nFees = 0;
-    {
-        LOCK2(cs_main, mempool.cs);
-        CTxDB txdb("r");
-
-        // Priority order to process transactions
-        list<COrphan> vOrphan; // list memory doesn't move
-        map<uint256, vector<COrphan*> > mapDependers;
-        multimap<double, CTransaction*> mapPriority;
-        for (map<uint256, CTransaction>::iterator mi = mempool.mapTx.begin(); mi != mempool.mapTx.end(); ++mi)
-        {
-            CTransaction& tx = (*mi).second;
-            if (tx.IsCoinBase() || tx.IsCoinStake() || !tx.IsFinal())
-                continue;
-
-            COrphan* porphan = NULL;
-            double dPriority = 0;
-            BOOST_FOREACH(const CTxIn& txin, tx.vin)
-            {
-                // Read prev transaction
-                CTransaction txPrev;
-                CTxIndex txindex;
-                if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
-                {
-                    // Has to wait for dependencies
-                    if (!porphan)
-                    {
-                        // Use list for automatic deletion
-                        vOrphan.push_back(COrphan(&tx));
-                        porphan = &vOrphan.back();
-                    }
-                    mapDependers[txin.prevout.hash].push_back(porphan);
-                    porphan->setDependsOn.insert(txin.prevout.hash);
-                    continue;
-                }
-                int64 nValueIn = txPrev.vout[txin.prevout.n].nValue;
-
-                // Read block header
-                int nConf = txindex.GetDepthInMainChain();
-
-                dPriority += (double)nValueIn * nConf;
-
-                if (fDebug && GetBoolArg("-printpriority"))
-                    printf("priority     nValueIn=%-12"PRI64d" nConf=%-5d dPriority=%-20.1f\n", nValueIn, nConf, dPriority);
-            }
-
-            // Priority is sum(valuein * age) / txsize
-            dPriority /= ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
-
-            if (porphan)
-                porphan->dPriority = dPriority;
-            else
-                mapPriority.insert(make_pair(-dPriority, &(*mi).second));
-
-            if (fDebug && GetBoolArg("-printpriority"))
-            {
-                printf("priority %-20.1f %s\n%s", dPriority, tx.GetHash().ToString().substr(0,10).c_str(), tx.ToString().c_str());
-                if (porphan)
-                    porphan->print();
-                printf("\n");
-            }
-        }
-
-        // Collect transactions into block
-        map<uint256, CTxIndex> mapTestPool;
-        uint64 nBlockSize = 1000;
-        uint64 nBlockTx = 0;
-        int nBlockSigOps = 100;
-        while (!mapPriority.empty())
-        {
-            // Take highest priority transaction off priority queue
-            CTransaction& tx = *(*mapPriority.begin()).second;
-            mapPriority.erase(mapPriority.begin());
-
-            // Size limits
-            unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
-            if (nBlockSize + nTxSize >= MAX_BLOCK_SIZE_GEN)
-                continue;
-
-            // Legacy limits on sigOps:
-            unsigned int nTxSigOps = tx.GetLegacySigOpCount();
-            if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
-                continue;
-
-            // Timestamp limit
-            if (tx.nTime > GetAdjustedTime())
-                continue;
-
-            // ppcoin: simplify transaction fee - allow free = false
-            int64 nMinFee = tx.GetMinFee(nBlockSize, false, GMF_BLOCK);
-
-            // Connecting shouldn't fail due to dependency on other memory pool transactions
-            // because we're already processing them in order of dependency
-            map<uint256, CTxIndex> mapTestPoolTmp(mapTestPool);
-            MapPrevTx mapInputs;
-            bool fInvalid;
-            if (!tx.FetchInputs(txdb, mapTestPoolTmp, false, true, mapInputs, fInvalid))
-                continue;
-
-            int64 nTxFees = tx.GetValueIn(mapInputs)-tx.GetValueOut();
-            if (nTxFees < nMinFee)
-                continue;
-
-            nTxSigOps += tx.GetP2SHSigOpCount(mapInputs);
-            if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
-                continue;
-
-            if (!tx.ConnectInputs(txdb, mapInputs, mapTestPoolTmp, CDiskTxPos(1,1,1), pindexPrev, false, true))
-                continue;
-            mapTestPoolTmp[tx.GetHash()] = CTxIndex(CDiskTxPos(1,1,1), tx.vout.size());
-            swap(mapTestPool, mapTestPoolTmp);
-
-            // Added
-            pblock->vtx.push_back(tx);
-            nBlockSize += nTxSize;
-            ++nBlockTx;
-            nBlockSigOps += nTxSigOps;
-            nFees += nTxFees;
-
-            // Add transactions that depend on this one to the priority queue
-            uint256 hash = tx.GetHash();
-            if (mapDependers.count(hash))
-            {
-                BOOST_FOREACH(COrphan* porphan, mapDependers[hash])
-                {
-                    if (!porphan->setDependsOn.empty())
-                    {
-                        porphan->setDependsOn.erase(hash);
-                        if (porphan->setDependsOn.empty())
-                            mapPriority.insert(make_pair(-porphan->dPriority, porphan->ptx));
-                    }
-                }
-            }
-        }
-
-        nLastBlockTx = nBlockTx;
-        nLastBlockSize = nBlockSize;
-        if (fDebug && GetBoolArg("-printpriority"))
-            printf("CreateNewBlock(): total size %lu\n", nBlockSize);
-
-    }
-    if (pblock->IsProofOfWork())
-        pblock->vtx[0].vout[0].nValue = GetProofOfWorkReward(pblock->nBits);
-
-    // Fill in header
-    pblock->hashPrevBlock  = pindexPrev->GetBlockHash();
-    pblock->hashMerkleRoot = pblock->BuildMerkleTree();
-    pblock->nTime          = max(pindexPrev->GetMedianTimePast()+1, pblock->GetMaxTransactionTime());
-    pblock->nTime          = max(pblock->GetBlockTime(), pindexPrev->GetBlockTime() - nMaxClockDrift);
-    pblock->UpdateTime(pindexPrev);
-    pblock->nNonce         = 0;
-
-    return pblock.release();
-}
-
-
-void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce)
-{
-    // Update nExtraNonce
-    static uint256 hashPrevBlock;
-    if (hashPrevBlock != pblock->hashPrevBlock)
-    {
-        nExtraNonce = 0;
-        hashPrevBlock = pblock->hashPrevBlock;
-    }
-    ++nExtraNonce;
-    pblock->vtx[0].vin[0].scriptSig = (CScript() << pblock->nTime << CBigNum(nExtraNonce)) + COINBASE_FLAGS;
-    assert(pblock->vtx[0].vin[0].scriptSig.size() <= 100);
-
-    pblock->hashMerkleRoot = pblock->BuildMerkleTree();
-}
-
-
-void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1)
-{
-    //
-    // Prebuild hash buffers
-    //
-    struct
-    {
-        struct unnamed2
-        {
-            int nVersion;
-            uint256 hashPrevBlock;
-            uint256 hashMerkleRoot;
-            unsigned int nTime;
-            unsigned int nBits;
-            unsigned int nNonce;
-        }
-        block;
-        unsigned char pchPadding0[64];
-        uint256 hash1;
-        unsigned char pchPadding1[64];
-    }
-    tmp;
-    memset(&tmp, 0, sizeof(tmp));
-
-    tmp.block.nVersion       = pblock->nVersion;
-    tmp.block.hashPrevBlock  = pblock->hashPrevBlock;
-    tmp.block.hashMerkleRoot = pblock->hashMerkleRoot;
-    tmp.block.nTime          = pblock->nTime;
-    tmp.block.nBits          = pblock->nBits;
-    tmp.block.nNonce         = pblock->nNonce;
-
-    FormatHashBlocks(&tmp.block, sizeof(tmp.block));
-    FormatHashBlocks(&tmp.hash1, sizeof(tmp.hash1));
-
-    // Byte swap all the input buffer
-    for (unsigned int i = 0; i < sizeof(tmp)/4; i++)
-        ((unsigned int*)&tmp)[i] = ByteReverse(((unsigned int*)&tmp)[i]);
-
-    // Precalc the first half of the first hash, which stays constant
-    SHA256Transform(pmidstate, &tmp.block, pSHA256InitState);
-
-    memcpy(pdata, &tmp.block, 128);
-    memcpy(phash1, &tmp.hash1, 64);
-}
-
-
-bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey)
-{
-    uint256 hash = pblock->GetHash();
-    uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
-
-    if (hash > hashTarget && pblock->IsProofOfWork())
-        return error("BitcoinMiner : proof-of-work not meeting target");
-
-    //// debug print
-    printf("BitcoinMiner:\n");
-    printf("new block found  \n  hash: %s  \ntarget: %s\n", hash.GetHex().c_str(), hashTarget.GetHex().c_str());
-    pblock->print();
-    printf("%s ", DateTimeStrFormat(GetTime()).c_str());
-    printf("generated %s\n", FormatMoney(pblock->vtx[0].vout[0].nValue).c_str());
-
-    // Found a solution
-    {
-        LOCK(cs_main);
-        if (pblock->hashPrevBlock != hashBestChain)
-            return error("BitcoinMiner : generated block is stale");
-
-        // Remove key from key pool
-        reservekey.KeepKey();
-
-        // Track how many getdata requests this block gets
-        {
-            LOCK(wallet.cs_wallet);
-            wallet.mapRequestCount[pblock->GetHash()] = 0;
-        }
-
-        // Process this block the same as if we had received it from another node
-        if (!ProcessBlock(NULL, pblock))
-            return error("BitcoinMiner : ProcessBlock, block not accepted");
-    }
-
-    return true;
-}
-
-void static ThreadBitcoinMiner(void* parg);
-
-static bool fGenerateBitcoins = false;
-static bool fLimitProcessors = false;
-static int nLimitProcessors = -1;
-
-void BitcoinMiner(CWallet *pwallet, bool fProofOfStake)
-{
-    printf("CPUMiner started for proof-of-%s\n", fProofOfStake? "stake" : "work");
-    SetThreadPriority(THREAD_PRIORITY_LOWEST);
-
-    // Each thread has its own key and counter
-    CReserveKey reservekey(pwallet);
-    unsigned int nExtraNonce = 0;
-
-    while (fGenerateBitcoins || fProofOfStake)
-    {
-        if (fShutdown)
-            return;
-        while (vNodes.empty() || IsInitialBlockDownload())
-        {
-            Sleep(1000);
-            if (fShutdown)
-                return;
-            if ((!fGenerateBitcoins) && !fProofOfStake)
-                return;
-        }
-
-        while (pwallet->IsLocked())
-        {
-            strMintWarning = strMintMessage;
-            Sleep(1000);
-        }
-        strMintWarning = "";
-
-        //
-        // Create new block
-        //
-        unsigned int nTransactionsUpdatedLast = nTransactionsUpdated;
-        CBlockIndex* pindexPrev = pindexBest;
-
-        auto_ptr<CBlock> pblock(CreateNewBlock(pwallet, fProofOfStake));
-        if (!pblock.get())
-            return;
-
-        IncrementExtraNonce(pblock.get(), pindexPrev, nExtraNonce);
-
-        // ppcoin: if proof-of-stake block found then process block
-        if (fProofOfStake)
-        {
-            if (pblock->IsProofOfStake())
-            {
-                if (!pblock->SignBlock(*pwalletMain))
-                {
-                    strMintWarning = strMintMessage;
-                    continue;
-                }
-                strMintWarning = "";
-                printf("CPUMiner : proof-of-stake block found %s\n", pblock->GetHash().ToString().c_str()); 
-                SetThreadPriority(THREAD_PRIORITY_NORMAL);
-                CheckWork(pblock.get(), *pwalletMain, reservekey);
-                SetThreadPriority(THREAD_PRIORITY_LOWEST);
-            }
-            Sleep(500);
-            continue;
-        }
-
-        printf("Running BitcoinMiner with %d transactions in block\n", pblock->vtx.size());
-
-
-        //
-        // Prebuild hash buffers
-        //
-        char pmidstatebuf[32+16]; char* pmidstate = alignup<16>(pmidstatebuf);
-        char pdatabuf[128+16];    char* pdata     = alignup<16>(pdatabuf);
-        char phash1buf[64+16];    char* phash1    = alignup<16>(phash1buf);
-
-        FormatHashBuffers(pblock.get(), pmidstate, pdata, phash1);
-
-        unsigned int& nBlockTime = *(unsigned int*)(pdata + 64 + 4);
-        unsigned int& nBlockNonce = *(unsigned int*)(pdata + 64 + 12);
-
-
-        //
-        // Search
-        //
-        int64 nStart = GetTime();
-        uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
-        uint256 hashbuf[2];
-        uint256& hash = *alignup<16>(hashbuf);
-        loop
-        {
-            unsigned int nHashesDone = 0;
-            unsigned int nNonceFound;
-
-            // Crypto++ SHA-256
-            nNonceFound = ScanHash_CryptoPP(pmidstate, pdata + 64, phash1,
-                                            (char*)&hash, nHashesDone);
-
-            // Check if something found
-            if (nNonceFound != (unsigned int) -1)
-            {
-                for (unsigned int i = 0; i < sizeof(hash)/4; i++)
-                    ((unsigned int*)&hash)[i] = ByteReverse(((unsigned int*)&hash)[i]);
-
-                if (hash <= hashTarget)
-                {
-                    // Found a solution
-                    pblock->nNonce = ByteReverse(nNonceFound);
-                    assert(hash == pblock->GetHash());
-                    if (!pblock->SignBlock(*pwalletMain))
-                    {
-                        strMintWarning = strMintMessage;
-                        break;
-                    }
-                    strMintWarning = "";
-                    SetThreadPriority(THREAD_PRIORITY_NORMAL);
-                    CheckWork(pblock.get(), *pwalletMain, reservekey);
-                    SetThreadPriority(THREAD_PRIORITY_LOWEST);
-                    break;
-                }
-            }
-
-            // Meter hashes/sec
-            static int64 nHashCounter;
-            if (nHPSTimerStart == 0)
-            {
-                nHPSTimerStart = GetTimeMillis();
-                nHashCounter = 0;
-            }
-            else
-                nHashCounter += nHashesDone;
-            if (GetTimeMillis() - nHPSTimerStart > 4000)
-            {
-                static CCriticalSection cs;
-                {
-                    LOCK(cs);
-                    if (GetTimeMillis() - nHPSTimerStart > 4000)
-                    {
-                        dHashesPerSec = 1000.0 * nHashCounter / (GetTimeMillis() - nHPSTimerStart);
-                        nHPSTimerStart = GetTimeMillis();
-                        nHashCounter = 0;
-                        static int64 nLogTime;
-                        if (GetTime() - nLogTime > 30 * 60)
-                        {
-                            nLogTime = GetTime();
-                            printf("%s ", DateTimeStrFormat(GetTime()).c_str());
-                            printf("hashmeter %3d CPUs %6.0f khash/s\n", vnThreadsRunning[THREAD_MINER], dHashesPerSec/1000.0);
-                        }
-                    }
-                }
-            }
-
-            // Check for stop or if block needs to be rebuilt
-            if (fShutdown)
-                return;
-            if (!fGenerateBitcoins)
-                return;
-            if (fLimitProcessors && vnThreadsRunning[THREAD_MINER] > nLimitProcessors)
-                return;
-            if (vNodes.empty())
-                break;
-            if (nBlockNonce >= 0xffff0000)
-                break;
-            if (nTransactionsUpdated != nTransactionsUpdatedLast && GetTime() - nStart > 60)
-                break;
-            if (pindexPrev != pindexBest)
-                break;
-
-            // Update nTime every few seconds
-            pblock->nTime = max(pindexPrev->GetMedianTimePast()+1, pblock->GetMaxTransactionTime());
-            pblock->nTime = max(pblock->GetBlockTime(), pindexPrev->GetBlockTime() - nMaxClockDrift);
-            pblock->UpdateTime(pindexPrev);
-            nBlockTime = ByteReverse(pblock->nTime);
-            if (pblock->GetBlockTime() >= (int64)pblock->vtx[0].nTime + nMaxClockDrift)
-                break;  // need to update coinbase timestamp
-        }
-    }
-}
-
-void static ThreadBitcoinMiner(void* parg)
-{
-    CWallet* pwallet = (CWallet*)parg;
-    try
-    {
-        vnThreadsRunning[THREAD_MINER]++;
-        BitcoinMiner(pwallet, false);
-        vnThreadsRunning[THREAD_MINER]--;
-    }
-    catch (std::exception& e) {
-        vnThreadsRunning[THREAD_MINER]--;
-        PrintException(&e, "ThreadBitcoinMiner()");
-    } catch (...) {
-        vnThreadsRunning[THREAD_MINER]--;
-        PrintException(NULL, "ThreadBitcoinMiner()");
-    }
-    nHPSTimerStart = 0;
-    if (vnThreadsRunning[THREAD_MINER] == 0)
-        dHashesPerSec = 0;
-    printf("ThreadBitcoinMiner exiting, %d threads remaining\n", vnThreadsRunning[THREAD_MINER]);
-}
-
-
-void GenerateBitcoins(bool fGenerate, CWallet* pwallet)
-{
-    fGenerateBitcoins = fGenerate;
-    nLimitProcessors = GetArg("-genproclimit", -1);
-    if (nLimitProcessors == 0)
-        fGenerateBitcoins = false;
-    fLimitProcessors = (nLimitProcessors != -1);
-
-    if (fGenerate)
-    {
-        int nProcessors = boost::thread::hardware_concurrency();
-        printf("%d processors\n", nProcessors);
-        if (nProcessors < 1)
-            nProcessors = 1;
-        if (fLimitProcessors && nProcessors > nLimitProcessors)
-            nProcessors = nLimitProcessors;
-        int nAddThreads = nProcessors - vnThreadsRunning[THREAD_MINER];
-        printf("Starting %d BitcoinMiner threads\n", nAddThreads);
-        for (int i = 0; i < nAddThreads; i++)
-        {
-            if (!CreateThread(ThreadBitcoinMiner, pwallet))
-                printf("Error: CreateThread(ThreadBitcoinMiner) failed\n");
-            Sleep(10);
-        }
-    }
-}