JSON-RPC method: prioritisetransaction <txid> <priority delta> <priority tx fee>

Accepts the transaction into mined blocks at a higher (or lower) priority

src/main.cpp

@@ -789,6 +789,16 @@ bool CheckTransaction(const CTransaction& tx, CValidationState &state)
 
 int64_t GetMinFee(const CTransaction& tx, unsigned int nBytes, bool fAllowFree, enum GetMinFee_mode mode)
 {
+    {
+        LOCK(mempool.cs);
+        uint256 hash = tx.GetHash();
+        double dPriorityDelta = 0;
+        int64_t nFeeDelta = 0;
+        mempool.ApplyDeltas(hash, dPriorityDelta, nFeeDelta);
+        if (dPriorityDelta > 0 || nFeeDelta > 0)
+            return 0;
+    }
+
     // Base fee is either minTxFee or minRelayTxFee
     CFeeRate baseFeeRate = (mode == GMF_RELAY) ? tx.minRelayTxFee : tx.minTxFee;