From 4ffa5951a45683c8609deca0f69fdabfc86697df Mon Sep 17 00:00:00 2001
From: Sunny King <sunnyking9999@gmail.com>
Date: Fri, 24 Aug 2012 20:14:01 +0100
Subject: [PATCH] PPCoin: Allow multiple outputs for coinbase and coinstake
         Upgrade requirements: upgrade with deadline, possible fork

---
 src/main.cpp   |    4 ++--
 src/main.h     |    4 ++--
 src/wallet.cpp |   42 ++++++++++++++++++++++++++++++------------
 3 files changed, 34 insertions(+), 16 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 2be1fef..2b0bef8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1232,7 +1232,7 @@ bool CTransaction::ConnectInputs(CTxDB& txdb, MapPrevTx inputs,
             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))
+            if (nStakeReward > GetProofOfStakeReward(nCoinAge) - GetMinFee() + MIN_TX_FEE)
                 return DoS(100, error("ConnectInputs() : %s stake reward exceeded", GetHash().ToString().substr(0,10).c_str()));
         }
         else
@@ -1908,7 +1908,7 @@ bool CBlock::CheckBlock() const
         return DoS(50, error("CheckBlock() : coinstake timestamp is too early"));
 
     // Check coinbase reward
-    if (vtx[0].GetValueOut() > (IsProofOfWork()? GetProofOfWorkReward(nBits) : 0))
+    if (vtx[0].GetValueOut() > (IsProofOfWork()? (GetProofOfWorkReward(nBits) - vtx[0].GetMinFee() + MIN_TX_FEE) : 0))
         return DoS(50, error("CheckBlock() : coinbase reward exceeded %s > %s", 
                    FormatMoney(vtx[0].GetValueOut()).c_str(),
                    FormatMoney(IsProofOfWork()? GetProofOfWorkReward(nBits) : 0).c_str()));
diff --git a/src/main.h b/src/main.h
index 43a8b70..5232a93 100644
--- a/src/main.h
+++ b/src/main.h
@@ -502,13 +502,13 @@ public:
 
     bool IsCoinBase() const
     {
-        return (vin.size() == 1 && vin[0].prevout.IsNull() && vout.size() == 1);
+        return (vin.size() == 1 && vin[0].prevout.IsNull() && vout.size() >= 1);
     }
 
     bool IsCoinStake() const
     {
         // ppcoin: the coin stake transaction is marked with the first output empty
-        return (vin.size() > 0 && vout.size() == 2 && vout[0].IsEmpty());
+        return (vin.size() > 0 && (!vin[0].prevout.IsNull()) && vout.size() >= 2 && vout[0].IsEmpty());
     }
 
     /** Check for standard transaction types
diff --git a/src/wallet.cpp b/src/wallet.cpp
index 6cc679b..b740c8a 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -1288,21 +1288,39 @@ bool CWallet::CreateCoinStake(unsigned int nBits, CTransaction& txNew)
             return error("CreateCoinStake : failed to calculate coin age");
         nCredit += GetProofOfStakeReward(nCoinAge);
     }
-    // Set output amount
-    txNew.vout[1].nValue = nCredit;
 
-    // Sign
-    int nIn = 0;
-    BOOST_FOREACH(const CWalletTx* pcoin, vwtxPrev)
+    int64 nMinFee = 0;
+    loop
     {
-        if (!SignSignature(*this, *pcoin, txNew, nIn++))
-            return error("CreateCoinStake : failed to sign coinstake");
-    }
+        // Set output amount
+        txNew.vout[1].nValue = nCredit - nMinFee;
 
-    // Limit size
-    unsigned int nBytes = ::GetSerializeSize(txNew, SER_NETWORK, PROTOCOL_VERSION);
-    if (nBytes >= MAX_BLOCK_SIZE_GEN/5)
-        return false;
+        // Sign
+        int nIn = 0;
+        BOOST_FOREACH(const CWalletTx* pcoin, vwtxPrev)
+        {
+            if (!SignSignature(*this, *pcoin, txNew, nIn++))
+                return error("CreateCoinStake : failed to sign coinstake");
+        }
+
+        // Limit size
+        unsigned int nBytes = ::GetSerializeSize(txNew, SER_NETWORK, PROTOCOL_VERSION);
+        if (nBytes >= MAX_BLOCK_SIZE_GEN/5)
+            return false;
+
+        // Check enough fee is paid
+        if (nMinFee < txNew.GetMinFee() - MIN_TX_FEE)
+        {
+            nMinFee = txNew.GetMinFee() - MIN_TX_FEE;
+            continue; // try signing again
+        }
+        else
+        {
+            if (fDebug && GetBoolArg("-printfee"))
+                printf("CreateCoinStake : fee for coinstake %s\n", FormatMoney(nMinFee).c_str());
+            break;
+        }
+    }
 
     // Successfully generated coinstake
     return true;
-- 
1.7.1