[Lightning-dev] Pay-to-Open and UX improvements

ZmnSCPxj ZmnSCPxj at protonmail.com
Tue Dec 17 15:14:50 UTC 2019


Good morning David, t-bast, and all,


> I'm not aware of any way to currently force single-show signatures in
> Bitcoin, so this is pretty theoretical. Also, single-show signatures
> add a lot of fragility to any setup and make useful features like RBF
> fee bumping unavailable.

With `OP_CAT`, we can enforce that a particular `R` is used, which allows to implement single-show signatures.

    # Assuming signatures are the concatenation of (R,s)
    <R> OP_SWAP OP_CAT <ACINQ> OP_CHECKSIG

The above would then feed `s` only on the witness stack.

Regards,
ZmnSCPxj


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