--- Log opened Sun Feb 06 00:00:21 2022
--- Day changed Sun Feb 06 2022
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10:54 < ariard> _aj_: right, i understand that two signatures (one for each counterparty in 2-party constructions) in a script-path would let you use APO-AS, and thus avoid update signatures dup 
10:55 < ariard> but I think it makes the cost of non-cooperative update spend higher, compared to a more optimized option where they would spend directly the key path
10:55 < ariard> and we can't because you need key tag
10:57 < ariard> like an unilateral close spending directly the funding output, which should be the optimistic spend of the non-cooperative close (we can assume counterparties are not buggy or malicious and won't broadcast intermediary updates)
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21:45 < _aj_> ariard: hmm, "2 signatures" is ambiguous... i mean, there's two ways you can sign for an eltoo state/update/commitment: one is by spending the funding tx, the other is by spending a previous state. so when doing a channel update, you have to be sure to have sigs for both paths. you could do that with a single signature, by having the funding output have a tapscript path that matches the state 
21:45 < _aj_> outputs (state "0"). or you could do two separate sigs, and use a non-APO keypath signature when spending the funding tx
21:45 < _aj_> ariard: unlike with PTLC claims, i don't think you need to have two signatures onchain for the eltoo state updates; a single musig signature should work, i think
21:47 < _aj_> ariard: (if you want to have the funding output be batched, like in the ideas for CTV, then you can't spend it without an APO signature though)
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--- Log closed Mon Feb 07 00:00:52 2022