--- Log opened Tue Jan 02 00:00:17 2024
00:01 < realtbast[m]> ksedgwic: currently yes, this is using the same commitment (and thus HTLC) feerate, because if you were happy with the commitment feerate before splicing, why wouldn't you be for the spliced transaction?
00:02 < realtbast[m]> But this touches a related topic: we will use the splicing mechanism to also upgrade channels (static_remotekey -> anchor for example) and modify channel parameters (e.g. max-htlc-in-flight)
00:02 < realtbast[m]> When we do so, that will allow the commitment feerate to be different across splice attempts
00:02 < realtbast[m]> So I believe implementations should be ready for that, even though the spec doesn't yet allow those changes
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01:06 < ksedgwic[m]> Wouldn't a new rbf candidate for a splice want to increase the fee rate?  We're explicitly unhappy with the prior fee situation...
01:12 < realtbast[m]> It increases the feerate of the funding transaction, not the feerate of the commitment transaction
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08:44 < ksedgwic[m]> Yes, but wouldn't it be motivation to increase the fee rate of the commitment (the 2nd level htlc-{success, timeout} feerate is the specific concern).
08:44 < ksedgwic[m]> Put differently, are splice rbf candidates required to use the same htlc feerate as the original commitment did?  Can we rely on that?
08:57 < realtbast[m]> I don't understand why you would want to correlate the funding feerate and the commitment/htlc feerate, they should really be independent.
08:57 < realtbast[m]> Right now RBF candidates are required to use the same htlc feerate as the original commitment.
08:57 < realtbast[m]> However, it wouldn't be very future-proof to rely on that: I'm pretty sure that in the future, we'll allow some negotiation of channel parameters (including the htlc feerate) in splice attempts, which means that those values won't necessarily be the same across RBF candidates.
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11:15 < ksedgwic[m]> Thanks, this is very helpful.  Not trying to specifically correlate the feerates, my concern is whether particular implementation data structures are going to be general enough ... your responses have clarified things a bunch.
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--- Log closed Wed Jan 03 00:00:18 2024