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Yeah you don't have final settlement until you have a block actually mined. Its been the longstanding recommendation to consider 6 blocks final settlement actually because Bitcoin's on-chain security is a probabilistic model on an exponential curve towards assurance, however, only 1 block has been all that was necessary for a very long time.
So you can hope whoever you bought from doesn't try to broadcast the transaction with a higher fee to a different address, but you should also contact the seller and let them know if you'd be alright with them taking from your purchase for a higher fee or if you're willing to wait until the fees come down.
On Bisq neither the seller nor the buyer has to change anything in the transaction.
This transaction does NOT support Replace-By-Fee (RBF) and cannot be fee bumped using this method
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Okay but your transaction was forgotten by the network (well maybe not my node, but my 2GB mempool won't be relevant until the mempool of other nodes goes down in memory usage).
What you want to look at, is fullrbf. FullRBF happens even when a transaction does not support RBF
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