Make sure mixing masternode follows bip69 before signing final mixing tx (#1510)

* Make sure mixing tx follows bip69 before signing it

* bump MIN_PRIVATESEND_PEER_PROTO_VERSION to 70208

Author: UdjinM6

src/privatesend-client.cpp

@@ -492,6 +492,18 @@ bool CPrivateSendClient::SignFinalTransaction(const CTransaction& finalTransacti
     finalMutableTransaction = finalTransactionNew;
     LogPrintf("CPrivateSendClient::SignFinalTransaction -- finalMutableTransaction=%s", finalMutableTransaction.ToString());
 
+    // Make sure it's BIP69 compliant
+    sort(finalMutableTransaction.vin.begin(), finalMutableTransaction.vin.end(), CompareInputBIP69());
+    sort(finalMutableTransaction.vout.begin(), finalMutableTransaction.vout.end(), CompareOutputBIP69());
+
+    if(finalMutableTransaction.GetHash() != finalTransactionNew.GetHash()) {
+        LogPrintf("CPrivateSendClient::SignFinalTransaction -- WARNING! Masternode %s is not BIP69 compliant!\n", infoMixingMasternode.vin.prevout.ToStringShort());
+        UnlockCoins();
+        keyHolderStorage.ReturnAll();
+        SetNull();
+        return false;
+    }
+
     std::vector<CTxIn> sigs;
 
     //make sure my inputs/outputs are present, otherwise refuse to sign

src/privatesend.h

@@ -22,7 +22,7 @@ static const int PRIVATESEND_QUEUE_TIMEOUT          = 30;
 static const int PRIVATESEND_SIGNING_TIMEOUT        = 15;
 
 //! minimum peer version accepted by mixing pool
-static const int MIN_PRIVATESEND_PEER_PROTO_VERSION = 70206;
+static const int MIN_PRIVATESEND_PEER_PROTO_VERSION = 70208;
 
 static const CAmount PRIVATESEND_ENTRY_MAX_SIZE     = 9;