Issue Details

Number

26527

Title

wallet: don't back-date locktime when spending unconfirmed UTXOs

Description

As mentioned in https://github.com/bitcoin/bitcoin/pull/26451#issuecomment-1313934927 example 3: If we do anti-fee sniping, the Bitcoin Core wallet has a 10% chance to back-date the locktime of a transaction to up to 100 blocks. Electrum has similar behavior. https://github.com/bitcoin/bitcoin/blob/48174c0f287b19931ca110670610bd03a03eb914/src/wallet/spend.cpp#L725-L731 When spending an unconfirmed UTXO, it can happen that we back-date the locktime of our transaction to a locktime before the locktime of the unconfirmed parent. In this case, the "transaction signed earlier but only broadcast now" is unrealistic I think (please correct me if you think there is a protocol where this makes sense). This is a fingerprint that we are a Bitcoin Core or Electrum wallet. related https://github.com/bitcoin/bitcoin/issues/26526 electrum issue: https://github.com/spesmilo/electrum/issues/8073

URL

https://github.com/bitcoin/bitcoin/issue/26527

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Notes

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Kill Factor (1-10)

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