Oddbean new post about login | logout What I meant was, if the sender low balls the fee, the receiver wants to get the tx confirmed, he will pay via cpfp
yes, this can happen, but if it wasn't worth doing you'd just spit at the bastard next time you saw them the use case really is something like how it would work with a cheque though... the main thing is it can be conveyed offline, without intermediary risk... just counterparty... you wouldn't count the payment settled until it is in your utxo