From ZmnSCPxj at protonmail.com  Thu Dec 19 06:24:15 2019
From: ZmnSCPxj at protonmail.com (ZmnSCPxj)
Date: Thu, 19 Dec 2019 06:24:15 +0000
Subject: [Lightning-dev] Pay-to-Open and UX improvements
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Good morning t-bast,

> > -   A script-path spend with the following script (and only that script):
> >     OP_SWAP OP_DUP <R> OP_EQUALVERIFY OP_SWAP <P> OP_CHECKSIG
> >
>
> Why not this:
>
> <R> OP_SWAP OP_CHECKSPLITSIG
>
> ?
>
> Since `R` is constrained to be fixed anyway, why repeat `R` twice, once in the script and once in the witness stack?

For that matter, since we are far more likely to have a constant `R` than a constant `s` maybe you should instead propose that `OP_CHECKSPLITSIG` be given `<s> <R> <P> OP_CHECKSPLITSIG`, so that a fixed-`R` single-show signature is just `<R> <P> OP_CHECKSPLITSIG`.

Regards,
ZmnSCPxj