From: Anthony Towns <aj@erisian•com.au>
To: Russell O'Connor <roconnor@blockstream•com>,
Bitcoin Protocol Discussion
<bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] Debate: 64 bytes in OP_RETURN VS taproot OP_FALSE OP_IF OP_PUSH
Date: Fri, 17 Feb 2023 22:49:41 +1000 [thread overview]
Message-ID: <Y+935dALZxEEVMmc@erisian.com.au> (raw)
In-Reply-To: <CAMZUoKkAdQ9TSMm4vPJOrThu_h6VbqwPhOQQR7-Yr+WZ0DMBYw@mail.gmail.com>
On Sat, Feb 04, 2023 at 07:11:35PM -0500, Russell O'Connor via bitcoin-dev wrote:
> Since bytes in the witness are cheaper than bytes in the script pubkey,
> there is a crossover point in data size where it will simply be cheaper to
> use witness data.
Given today's standardness constraints, that's true (because you first
need to construct a p2wsh/tapscript output that commits to the data,
then you have to spend it), but it needn't stay that way. Allowing a data
carrier entry in the annex (as contemplated for eltoo [0]) would allow
you to publish the data with a single transaction, with malleability
prevented because the annex content is committed to by the signature.
[0] https://github.com/bitcoin-inquisition/bitcoin/pull/22
I think the cost for publishing data via the witness today is roughly:
115 vb - for the commitment tx
115 vb + datalen/4 - for the publication tx
versus
125 vb + datalen - for a tx with an OP_RETURN output
so the crossover point is at a datalen of about 140 bytes. Perhaps
slightly more or less depending on how much you can combine these
inputs/outputs with other txs you would have made anyway.
With a datacarrier in the annex that has similar or higher limits than
OP_RETURN, I don't think OP_RETURN would ever be cheaper.
The other advantage to using the witness for random data compared to
OP_RETURN is that the txid commits to OP_RETURN output, so you must
download all OP_RETURN data to validate a block's merkle tree, whereas
you can partially validate a block (in particular, you can validate the
spendable utxo set) without downloading witness data [1].
[1] https://github.com/bitcoin/bitcoin/pull/27050
Cheers,
aj
next prev parent reply other threads:[~2023-02-17 12:49 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-01 0:46 Christopher Allen
2023-02-01 2:07 ` Peter Todd
2023-02-01 2:22 ` Christopher Allen
2023-02-01 8:36 ` Kostas Karasavvas
2023-02-01 12:51 ` Peter Todd
2023-02-01 14:02 ` Andrew Poelstra
2023-02-02 11:22 ` Peter Todd
2023-02-02 11:45 ` Aymeric Vitte
2023-02-02 11:49 ` Peter Todd
2023-02-02 12:24 ` Aymeric Vitte
2023-02-01 12:59 ` Aymeric Vitte
2023-02-02 13:25 ` Rijndael
2023-02-03 11:15 ` Aymeric Vitte
2023-02-03 18:47 ` Christopher Allen
2023-02-04 14:11 ` Kostas Karasavvas
2023-02-04 17:01 ` Aymeric Vitte
2023-02-04 18:54 ` Christopher Allen
2023-02-04 20:55 ` Aymeric Vitte
2023-02-04 22:18 ` Christopher Allen
2023-02-04 23:09 ` Aymeric Vitte
2023-02-05 0:04 ` Peter Todd
2023-02-05 11:40 ` Aymeric Vitte
2023-02-05 12:06 ` Peter Todd
2023-02-05 12:47 ` Aymeric Vitte
2023-02-05 0:11 ` Russell O'Connor
2023-02-05 2:01 ` Peter Todd
2023-02-05 18:12 ` Russell O'Connor
2023-02-12 16:23 ` Aymeric Vitte
2023-02-16 18:23 ` Aymeric Vitte
2023-02-16 19:59 ` Claus Ehrenberg
2023-02-17 10:56 ` Aymeric Vitte
2023-02-05 18:06 ` Andrew Poelstra
2023-02-17 12:49 ` Anthony Towns [this message]
2023-02-18 18:38 ` Aymeric Vitte
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=Y+935dALZxEEVMmc@erisian.com.au \
--to=aj@erisian$(echo .)com.au \
--cc=bitcoin-dev@lists$(echo .)linuxfoundation.org \
--cc=roconnor@blockstream$(echo .)com \
/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