I was thinking along the same lines as Z. With MuSig2 and pre-sharing of signature nonces it should stay three rounds and share a similar structure.
On Tue, 7 Dec 2021 at 11:08, ZmnSCPxj via Lightning-dev < lightning-dev@lists.linuxfoundation.org> wrote: > > Basically, if my memory and understanding are accurate, in the above, it > is the *PTLC-offerrer* which provides an adaptor signature. > That adaptor signature would be included in the `update_add_ptlc` message. > Isn't it the case that all previous PTLC adaptor signatures need to be re-sent for each update_add_ptlc message because the signatures would no longer be valid once the commit tx changes. I think it's better to put it in `commitment_signed` if possible. This is what is done with pre-signed HTLC signatures at the moment anyway. LL
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