Exclude coinstake from the fee calculation

src/core_write.cpp

@@ -187,6 +187,7 @@ void TxToUniv(const CTransaction& tx, const uint256& block_hash, UniValue& entry
     const bool have_undo = txundo != nullptr;
     CAmount amt_total_in = 0;
     CAmount amt_total_out = 0;
+    bool isCoinStake = tx.IsCoinStake();
 
     for (unsigned int i = 0; i < tx.vin.size(); i++) {
         const CTxIn& txin = tx.vin[i];
@@ -212,7 +213,10 @@ void TxToUniv(const CTransaction& tx, const uint256& block_hash, UniValue& entry
             const Coin& prev_coin = txundo->vprevout[i];
             const CTxOut& prev_txout = prev_coin.out;
 
-            amt_total_in += prev_txout.nValue;
+            if(!isCoinStake)
+            {
+                amt_total_in += prev_txout.nValue;
+            }
 
             if (verbosity == TxVerbosity::SHOW_DETAILS_AND_PREVOUT) {
                 UniValue o_script_pub_key(UniValue::VOBJ);
@@ -245,13 +249,13 @@ void TxToUniv(const CTransaction& tx, const uint256& block_hash, UniValue& entry
         out.pushKV("scriptPubKey", o);
         vout.push_back(out);
 
-        if (have_undo) {
+        if (have_undo && !isCoinStake) {
             amt_total_out += txout.nValue;
         }
     }
     entry.pushKV("vout", vout);
 
-    if (have_undo && !tx.IsCoinStake()) {
+    if (have_undo && !isCoinStake) {
         const CAmount fee = amt_total_in - amt_total_out;
         CHECK_NONFATAL(MoneyRange(fee));
         entry.pushKV("fee", ValueFromAmount(fee));