March 13, 2026

Spending an unconfirmed RBF transaction

What happens if a wallet spends an unconfirmed Opt-In Replace-by-fee (BIP125) transaction, but does not flag this spending transaction as Opt-In Replace-by-fee?

Receiving wallets would see that transaction as a non-RBF transaction, while it actually is, because it’s parent can be replaced, making the child transaction non-replacable.

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