Good morning Rusty and list, > Your zero-val-OP_TRUE-can't-be-spent-after-same-block SF is interesting, > > but if we want a SF just give us SIGHASH_NOINPUT and we'll not need this > > at all (though others still might).
We might still want this in general in Lightning; for instance we could make every funding transaction include such an output. If it turns out, our initial feerate estimate for the funding transaction is low, we can use the `OP_TRUE` for fee-bumping. This is a win for Lightning since the funding transaction ID remains the same (even in Decker-Russell-Osuntokun, the trigger transaction is signed with `SIGHASH_ALL`, and refers to a fixed funding transaction ID). Without the `OP_TRUE`-for-fee-bump, we would have to pretend to open a new different channel and RBF the old funding transaction with a new higher-feerate funding transaction, then keep track of which one gets confirmed deeply (there is a race where a miner discovers a block using the older funding transaction before our broadcast of the new funding transaction reaches it). (we could also feebump using the change output of the funding transaction, but such a change output might not exist for all funding transactions.) Regards, ZmnSCPxj _______________________________________________ bitcoin-dev mailing list email@example.com https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev