From: "Russell O'Connor" <roconnor@blockstream•com>
To: ZmnSCPxj <ZmnSCPxj@protonmail•com>,
Bitcoin Protocol Discussion
<bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] Speedy covenants (OP_CAT2)
Date: Wed, 11 May 2022 15:41:16 -0400 [thread overview]
Message-ID: <CAMZUoKnzjcYDM-mOhT00P7YO18YmjxRkYsfO6QFtYFn0mEtLQw@mail.gmail.com> (raw)
In-Reply-To: <M80pb4TxcE1yCMCW4IboyTtx8MSvp8m9tphXe2EYvIvcrcf2Wzsn4ManJw8EP_ri-ohqtIOPrEaw7XkUcTO3lfVSLN4WMUwpromwzLm15Kc=@protonmail.com>
[-- Attachment #1: Type: text/plain, Size: 1231 bytes --]
On Wed, May 11, 2022 at 7:42 AM ZmnSCPxj via bitcoin-dev <
bitcoin-dev@lists•linuxfoundation.org> wrote:
> REMEMBER: `OP_CAT` BY ITSELF DOES NOT ENABLE COVENANTS, WHETHER RECURSIVE
> OR NOT.
>
I think the state of the art has advanced to the point where we can say
"OP_CAT in tapscript enables non recursive covenants and it is unknown
whether OP_CAT can enable recursive covenants or not".
A. Poelstra in
https://www.wpsoftware.net/andrew/blog/cat-and-schnorr-tricks-i.html show
how to use CAT to use the schnorr verification opcode to get the sighash
value + 1 onto the stack, and then through some grinding and some more CAT,
get the actual sighash value on the stack. From there we can use SHA256 to
get the signed transaction data onto the stack and apply introspect (using
CAT) to build functionality similar to OP_CTV.
The missing bits for enabling recursive covenants comes down to needing to
transform a scriptpubkey into an taproot address, which involves some
tweaking. Poelstra has suggested that it might be possible to hijack the
ECDSA checksig operation from a parallel, legacy input, in order to perform
the calculations for this tweaking. But as far as I know no one has yet
been able to achieve this feat.
[-- Attachment #2: Type: text/html, Size: 1702 bytes --]
next prev parent reply other threads:[~2022-05-11 19:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-06 22:30 Jorge Timón
2022-05-07 3:06 ` ZmnSCPxj
2022-05-07 3:52 ` vjudeu
2022-05-07 13:31 ` Jorge Timón
2022-05-11 15:25 ` alicexbt
2022-05-11 16:03 ` vjudeu
2022-05-07 13:27 ` Jorge Timón
2022-05-07 14:08 ` ZmnSCPxj
[not found] ` <CABm2gDo1wTOoWcNgJ4mUgSB3KCtBSnjqe3nwVBSL+7=ziDJ==w@mail.gmail.com>
2022-05-07 22:28 ` ZmnSCPxj
2022-05-08 2:03 ` Nadav Ivgi
2022-05-08 2:19 ` ZmnSCPxj
2022-05-11 10:57 ` vjudeu
2022-05-11 11:42 ` ZmnSCPxj
2022-05-11 19:41 ` Russell O'Connor [this message]
2022-05-12 3:07 ` ZmnSCPxj
2022-05-12 10:48 ` Russell O'Connor
2022-05-13 21:43 ` Anthony Towns
2022-05-13 23:33 ` Russell O'Connor
2022-05-14 13:32 ` Erik Aronesty
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAMZUoKnzjcYDM-mOhT00P7YO18YmjxRkYsfO6QFtYFn0mEtLQw@mail.gmail.com \
--to=roconnor@blockstream$(echo .)com \
--cc=ZmnSCPxj@protonmail$(echo .)com \
--cc=bitcoin-dev@lists$(echo .)linuxfoundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox