From bastien at acinq.fr  Thu Dec 19 08:29:45 2019
From: bastien at acinq.fr (Bastien TEINTURIER)
Date: Thu, 19 Dec 2019 09:29:45 +0100
Subject: [Lightning-dev] Pay-to-Open and UX improvements
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Good points, these are good optimisations if we propose such a new opcode!
I'm still pondering whether this will be useful enough or if finney attacks
completely ruin all use-cases...

Le jeu. 19 d?c. 2019 ? 07:24, ZmnSCPxj <ZmnSCPxj at protonmail.com> a ?crit :

> 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
>
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