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Subject: Re: [bitcoindev] CTV + CSFS: a letter
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First of all, lol, we're really doing sign-on letters again? Great way to d=
iscourage people from=20
doing things.
That said, I have yet to see a reasoned explanation of why we should prefer=
CTV over TXHASH. Any=20
time I bring it up I get a few handwave arguments about "that would require=
bikeshedding", but I=20
don't see why that is an argument. Preferring to do something worse because=
something better would=20
require someone reasonable pick some reasonable encoding is not a good way =
to do engineering.
Maybe one of the letter-signers wants to provide an explanation for their v=
iew?
Matt
On 6/9/25 7:40 AM, James O'Beirne wrote:
> Good morning,
>=20
> A letter has been published advocating for the final review and
> activation of OP_CHECKTEMPLATEVERIFY (BIP-119) and OP_CHECKSIGFROMSTACK
> (BIP-348).
>=20
> The full text of the letter can be found at https://ctv-csfs.com. It is
> reproduced below.
>=20
> ---
>=20
> To the technical bitcoin community,
>=20
> We believe that the best next step for bitcoin would be to activate
> OP_CHECKTEMPLATEVERIFY (CTV, BIP-119) and OP_CHECKSIGFROMSTACK (CSFS,
> BIP-348). These opcodes enable functionality for a broad set of uses
> that will allow bitcoin to preserve and expand its role as a scarce,
> censorship-resistant store of value.
>=20
> While there are a few promising proposals to improve bitcoin at the
> consensus layer which may someday be deployed, we believe that CTV and
> CSFS are uniquely well reviewed, simple, and have been proven to be both
> safe and widely demanded.
>=20
> CTV was first formalized in BIP-119 over 5 years ago. Despite many
> attempts at refinement or replacement, it has remained the most widely
> preferred method for enforcing pregenerated transaction sequences using
> consensus. It unlocks valuable functionality for scaling solutions,
> vaults, congestion control, non-custodial mining, discreet log
> contracts, and more.
>=20
> CSFS is a primitive opcode that has been deployed to Blockstream=E2=80=99=
s
> Elements for at least 8 years. It represents no significant
> computational burden over bitcoin=E2=80=99s most often used opcode, OP_CH=
ECKSIG.
> It can be combined with CTV to implement ln-symmetry, a longstanding
> improvement to Lightning. It also unlocks a variety of other use cases.
>=20
> We respectfully ask Bitcoin Core contributors to prioritize the review
> and integration of CTV (PR #31989 or similar) and CSFS (PR #32247 or
> similar) within the next six months. We believe this timeline allows for
> rigorous final review and activation planning.
>=20
> This request isn't meant to suggest that these contributors dictate the
> consensus process, but rather it is an acknowledgement that before these
> opcodes can be activated, they must be implemented in the most widely
> used bitcoin client.
>=20
> As application and protocol developers, we are convinced of the
> significant benefits that these changes would bring to end users of
> bitcoin =E2=80=93 even if only considering their use for layer 1 security=
and
> layer 2 scaling solutions. We are optimistic that given the limited size
> and scope of these changes in both concept and implementation, they
> represent a realistic next step in the continuing and important work of
> preserving bitcoin's unique promise.
>=20
> Signed,
>=20
> Abdel (Starkware)
> Andrew Poelstra (@apoelstra)
> Ben Carman (@benthecarman)
> Ben Kaufman (@ben-kaufman)
> Brandon Black (@reardencode)
> Brian Langel (for Five Bells)
> Buck Perley (@puckberley)
> Calle (Cashu)
> Calvin Kim (@kcalvinalvin)
> Chun Wang (f2pool)
> Christian Decker (@cdecker)
> Coinjoined Chris (Bitsurance.eu)
> Evan Kaloudis (for Zeus)
> fiatjaf (@fiatjaf)
> Floppy (@1440000bytes)
> Gary Krause (@average-gary)
> Harsha Goli (@arshbot)
> Hunter Beast (@cryptoquick)
> Jad Mubaslat (@champbronc2)
> James O=E2=80=99Beirne (@jamesob)
> Jameson Lopp (@jlopp)
> Johan Halseth (@halseth)
> Luke Childs (@lukechilds)
> Matt Black (for Atomic Finance)
> Michael Tidwell (@miketwenty1)
> Nick Hansen (for Luxor Mining)
> Nitesh (@nitesh_btc)
> nvk (@nvk)
> Owen Kemeys (for Foundation)
> Paul Sztorc (@psztorc)
> Portland.HODL (for MARA Pool)
> Rijndael (@rot13maxi)
> Rob Hamilton (@rob1ham)
> Robin Linus (@RobinLinus)
> Sanket Kanjalkar (@sanket1729)
> Sean Ryan (Anchorage)
> Seth for Privacy (for Cake Wallet)
> Simanta Gautam (Alpen Labs)
> Steven Roose (@stevenroose)
> stutxo (@stutxo)
> Talip (@otaliptus)
> mononaut (@mononautical)
> vnprc (@vnprc)
>=20
> --=20
> You received this message because you are subscribed to the Google Groups=
"Bitcoin Development=20
> Mailing List" group.
> To unsubscribe from this group and stop receiving emails from it, send an=
email to=20
> bitcoindev+unsubscribe@googlegroups.com <mailto:bitcoindev+unsubscribe@go=
oglegroups.com>.
> To view this discussion visit https://groups.google.com/d/msgid/bitcoinde=
v/a86c2737-=20
> db79-4f54-9c1d-51beeb765163n%40googlegroups.com <https://groups.google.co=
m/d/msgid/bitcoindev/=20
> a86c2737-db79-4f54-9c1d-51beeb765163n%40googlegroups.com?utm_medium=3Dema=
il&utm_source=3Dfooter>.
--=20
You received this message because you are subscribed to the Google Groups "=
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To unsubscribe from this group and stop receiving emails from it, send an e=
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