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increment fee amount when desired fee rate is equal to common default rate of 1 sat/vb to ensure maximum relayability

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This commit is contained in:
Craig Raw 2025-10-21 09:50:36 +02:00
parent 4e68815fa9
commit ad90ea0d38
1 changed files with 8 additions and 3 deletions
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11
src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java
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@ -1118,8 +1118,11 @@ public class Wallet extends Persistable implements Comparable<Wallet> {
double noChangeVSize = transaction.getVirtualSize();
long noChangeFeeRequiredAmt = (fee == null ? (long)Math.floor(feeRate * noChangeVSize) : fee);
//Add 1 satoshi to accommodate longer signatures when feeRate equals default min relay fee to ensure fee is sufficient
noChangeFeeRequiredAmt = (fee == null && feeRate == minRelayFeeRate && minRelayFeeRate > 0d ? noChangeFeeRequiredAmt + 1 : noChangeFeeRequiredAmt);
//Add 1 satoshi to accommodate longer signatures when feeRate equals the current or common min relay fee to ensure fee is sufficient for maximum "relayability"
boolean isMinRelayRate = ((feeRate == minRelayFeeRate && minRelayFeeRate > 0d) || feeRate == Transaction.DEFAULT_MIN_RELAY_FEE) && fee == null;
if(isMinRelayRate) {
noChangeFeeRequiredAmt++;
}
//If sending all selected utxos, set the recipient amount to equal to total of those utxos less the no change fee
long maxSendAmt = totalSelectedAmt - noChangeFeeRequiredAmt;
@ -1162,7 +1165,9 @@ public class Wallet extends Persistable implements Comparable<Wallet> {
TransactionOutput changeOutput = new TransactionOutput(transaction, setChangeAmts.iterator().next(), changeNode.getOutputScript());
double changeVSize = noChangeVSize + changeOutput.getLength() * numSets;
long changeFeeRequiredAmt = (fee == null ? (long)Math.floor(feeRate * changeVSize) : fee);
changeFeeRequiredAmt = (fee == null && feeRate == minRelayFeeRate && minRelayFeeRate > 0d ? changeFeeRequiredAmt + 1 : changeFeeRequiredAmt);
if(isMinRelayRate) {
changeFeeRequiredAmt++;
}
while(changeFeeRequiredAmt % numSets > 0) {
changeFeeRequiredAmt++;
}