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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)

+Message-ID: <_p-Du0dVGx1_UqtSLb7UpQRrHWP0JVQOGFeZ3-W-m8eZNNshMsW_oFXw07nAZEnP-YZO6sBn9iF-RY7qK15jxCjQPBMc4LZ-4cesUuRose8=@protonmail.com>

+In-Reply-To: <nRFLHRhwXER56TrZy50tJ2HmvipjteXzPfz6mEs_VmyZ5sXDNVUIUniPppSphF5SOVCQmpRZSjmBN8_eIMZEbdFgl3vJn-8XSEmpAFmj5SM=@protonmail.com>

+References: <ZzZziZOy4IrTNbNG@console> <c91269ac-e579-4089-bf9a-fdc076e34727@murch.one> <nRFLHRhwXER56TrZy50tJ2HmvipjteXzPfz6mEs_VmyZ5sXDNVUIUniPppSphF5SOVCQmpRZSjmBN8_eIMZEbdFgl3vJn-8XSEmpAFmj5SM=@protonmail.com>

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+Reply-To: moonsettler <moonsettler@protonmail.com>

+Precedence: list

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+X-Spam-Score: -1.0 (-)

+

+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

+> --

+> You received this message because you are subscribed to the Google Groups=

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+

+--=20

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