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Date: Sat, 23 Nov 2024 19:45:02 +0000
To: Antoine Poinsot <darosior@protonmail.com>
From: "'moonsettler' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>
Cc: Murch <murch@murch.one>, bitcoindev@googlegroups.com
Subject: Re: [bitcoindev] CHECKSIGFROMSTACK(VERIFY/ADD)
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Dear List,
Can anyone think of a reason to keep OP_CHECKSIGFROMSTACKVERIFY as NOP5 ava=
ilable
in legacy script?
Currently Brandon and I are leaning towards simply removing CSFSV from LNha=
nce and
from the CSFS BIP.
Reasoning:
* CSFS is more likely to be used in Symmetry
* In case where CSFSV is desired OP_CSFS OP_VERIFY is perfectly workable.
* Simplifies code
* Don't have an actual use case for CSFSV in legacy rn
* Upgradeable NOPs are scarce
* Backporting tapscript would bring all functionality to legacy
BR,
moonsettler
Sent with Proton Mail secure email.
On Friday, November 15th, 2024 at 4:33 PM, 'Antoine Poinsot' via Bitcoin De=
velopment Mailing List <bitcoindev@googlegroups.com> wrote:
> To add to Murch's point, from my experience working with Script in genera=
l and
> trying to estimate the cost of validation of legacy script as part of the
> consensus cleanup in particular, i think we should refrain from modifying=
legacy
> Script and further complicate reasoning about the worst case unless stric=
tly
> necessary.
>=20
> Best,
> Antoine
>=20
> On Friday, November 15th, 2024 at 9:57 AM, Murch murch@murch.one wrote:
>=20
> > Hi everyone,
> >=20
> > On 2024-11-14 17:02, Brandon Black wrote:
> >=20
> > > * Should CHECKSIGFROMSTACKVERIFY (CSFSV) be added to pre-tapscript
> > > [=E2=80=A6]
> > > My personal thinking in initially including CSFSV in earlier script v=
ersions was basically that it's compatible with NOP forking, so why not.
> >=20
> > If there is no compelling use case or concrete benefit, I don=E2=80=99t=
think "it=E2=80=99s compatible, why not" is convincing motivation, especia=
lly at the cost of a NOP.
> >=20
> > On 2024-11-14 17:02, Brandon Black wrote:
> >=20
> > > * Should we include CHECKSIGFROMSTACKADD?
> >=20
> > I feel similar about this. If there is currently no demand for this, an=
d future demand also seems unlikely, I would prefer a smaller, more focused=
set of changes.
> >=20
> > Cheers,
> > Murch
> >=20
> > --
> > You received this message because you are subscribed to the Google Grou=
ps "Bitcoin Development Mailing List" group.
> > To unsubscribe from this group and stop receiving emails from it, send =
an email to bitcoindev+unsubscribe@googlegroups.com.
> > To view this discussion visit https://groups.google.com/d/msgid/bitcoin=
dev/c91269ac-e579-4089-bf9a-fdc076e34727%40murch.one.
>=20
>=20
> --
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