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Date: Mon, 9 Jun 2025 04:40:52 -0700 (PDT)
From: James O'Beirne <james.obeirne@gmail.com>
To: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
Message-Id: <a86c2737-db79-4f54-9c1d-51beeb765163n@googlegroups.com>
Subject: [bitcoindev] CTV + CSFS: a letter
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Good morning,
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.
---
To the technical bitcoin community,
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.
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.
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.
CSFS is a primitive opcode that has been deployed to Blockstream=E2=80=99s
Elements for at least 8 years. It represents no significant
computational burden over bitcoin=E2=80=99s most often used opcode, OP_CHEC=
KSIG.
It can be combined with CTV to implement ln-symmetry, a longstanding
improvement to Lightning. It also unlocks a variety of other use cases.
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.
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.
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 a=
nd
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.
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
You received this message because you are subscribed to the Google Groups "=
Bitcoin Development Mailing List" group.
To unsubscribe from this group and stop receiving emails from it, send an e=
mail to bitcoindev+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/bitcoindev/=
a86c2737-db79-4f54-9c1d-51beeb765163n%40googlegroups.com.
------=_Part_325059_76242879.1749469252265
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Good morning,<br /><br />A letter has been published advocating for the fin=
al review and<br />activation of OP_CHECKTEMPLATEVERIFY (BIP-119) and OP_CH=
ECKSIGFROMSTACK<br />(BIP-348). <br /><br />The full text of the letter can=
be found at https://ctv-csfs.com. It is<br />reproduced below.<br /><br />=
---<br /><br />To the technical bitcoin community,<br /><br />We believe th=
at the best next step for bitcoin would be to activate<br />OP_CHECKTEMPLAT=
EVERIFY (CTV, BIP-119) and OP_CHECKSIGFROMSTACK (CSFS,<br />BIP-348). These=
opcodes enable functionality for a broad set of uses<br />that will allow =
bitcoin to preserve and expand its role as a scarce,<br />censorship-resist=
ant store of value.<br /><br />While there are a few promising proposals to=
improve bitcoin at the<br />consensus layer which may someday be deployed,=
we believe that CTV and<br />CSFS are uniquely well reviewed, simple, and =
have been proven to be both<br />safe and widely demanded.<br /><br />CTV w=
as first formalized in BIP-119 over 5 years ago. Despite many<br />attempts=
at refinement or replacement, it has remained the most widely<br />preferr=
ed method for enforcing pregenerated transaction sequences using<br />conse=
nsus. It unlocks valuable functionality for scaling solutions,<br />vaults,=
congestion control, non-custodial mining, discreet log<br />contracts, and=
more.<br /><br />CSFS is a primitive opcode that has been deployed to Bloc=
kstream=E2=80=99s<br />Elements for at least 8 years. It represents no sign=
ificant<br />computational burden over bitcoin=E2=80=99s most often used op=
code, OP_CHECKSIG.<br />It can be combined with CTV to implement ln-symmetr=
y, a longstanding<br />improvement to Lightning. It also unlocks a variety =
of other use cases.<br /><br />We respectfully ask Bitcoin Core contributor=
s to prioritize the review<br />and integration of CTV (PR #31989 or simila=
r) and CSFS (PR #32247 or<br />similar) within the next six months. We beli=
eve this timeline allows for<br />rigorous final review and activation plan=
ning.<br /><br />This request isn't meant to suggest that these contributor=
s dictate the<br />consensus process, but rather it is an acknowledgement t=
hat before these<br />opcodes can be activated, they must be implemented in=
the most widely<br />used bitcoin client.<br /><br />As application and pr=
otocol developers, we are convinced of the<br />significant benefits that t=
hese changes would bring to end users of<br />bitcoin =E2=80=93 even if onl=
y considering their use for layer 1 security and<br />layer 2 scaling solut=
ions. We are optimistic that given the limited size<br />and scope of these=
changes in both concept and implementation, they<br />represent a realisti=
c next step in the continuing and important work of<br />preserving bitcoin=
's unique promise.<br /><br />Signed, <br /><br />Abdel (Starkware)<br />An=
drew Poelstra (@apoelstra)<br />Ben Carman (@benthecarman)<br />Ben Kaufman=
(@ben-kaufman)<br />Brandon Black (@reardencode)<br />Brian Langel (for Fi=
ve Bells)<br />Buck Perley (@puckberley)<br />Calle (Cashu)<br />Calvin Kim=
(@kcalvinalvin)<br />Chun Wang (f2pool)<br />Christian Decker (@cdecker)<b=
r />Coinjoined Chris (Bitsurance.eu)<br />Evan Kaloudis (for Zeus)<br />fia=
tjaf (@fiatjaf)<br />Floppy (@1440000bytes)<br />Gary Krause (@average-gary=
)<br />Harsha Goli (@arshbot)<br />Hunter Beast (@cryptoquick)<br />Jad Mub=
aslat (@champbronc2)<br />James O=E2=80=99Beirne (@jamesob)<br />Jameson Lo=
pp (@jlopp)<br />Johan Halseth (@halseth)<br />Luke Childs (@lukechilds)<br=
/>Matt Black (for Atomic Finance)<br />Michael Tidwell (@miketwenty1)<br /=
>Nick Hansen (for Luxor Mining)<br />Nitesh (@nitesh_btc)<br />nvk (@nvk)<b=
r />Owen Kemeys (for Foundation)<br />Paul Sztorc (@psztorc)<br />Portland.=
HODL (for MARA Pool)<br />Rijndael (@rot13maxi)<br />Rob Hamilton (@rob1ham=
)<br />Robin Linus (@RobinLinus)<br />Sanket Kanjalkar (@sanket1729)<br />S=
ean Ryan (Anchorage)<br />Seth for Privacy (for Cake Wallet)<br />Simanta G=
autam (Alpen Labs)<br />Steven Roose (@stevenroose)<br />stutxo (@stutxo)<b=
r />Talip (@otaliptus)<br />mononaut (@mononautical)<br />vnprc (@vnprc)<br=
/><br />
<p></p>
-- <br />
You received this message because you are subscribed to the Google Groups &=
quot;Bitcoin Development Mailing List" group.<br />
To unsubscribe from this group and stop receiving emails from it, send an e=
mail to <a href=3D"mailto:bitcoindev+unsubscribe@googlegroups.com">bitcoind=
ev+unsubscribe@googlegroups.com</a>.<br />
To view this discussion visit <a href=3D"https://groups.google.com/d/msgid/=
bitcoindev/a86c2737-db79-4f54-9c1d-51beeb765163n%40googlegroups.com?utm_med=
ium=3Demail&utm_source=3Dfooter">https://groups.google.com/d/msgid/bitcoind=
ev/a86c2737-db79-4f54-9c1d-51beeb765163n%40googlegroups.com</a>.<br />
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