Historical retrospective · Bitcoin
BIP 125 documented opt-in transaction replacement policy
BIP 125 describes rules under which an unconfirmed transaction can signal that a higher-fee replacement may supersede it.
Fee bumping gives senders a way to respond when network conditions change, instead of treating an unconfirmed transaction as irrevocable.
The proposal made mempool behavior and fee estimation part of practical wallet design, even though relay policy is distinct from consensus.
Users should distinguish “unconfirmed” from “final”; replacement policy is one reason a pending payment may still change.
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