From: Peter Todd <pete@petertodd•org>
To: Andrew Poelstra <apoelstra@wpsoftware•net>
Cc: 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: Thu, 2 Feb 2023 06:22:23 -0500 [thread overview]
Message-ID: <Y9uc72RSs6LQojG4@petertodd.org> (raw)
In-Reply-To: <Y9pxAdm3kO1rr2kU@camus>
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On Wed, Feb 01, 2023 at 02:02:41PM +0000, Andrew Poelstra wrote:
> On Tue, Jan 31, 2023 at 09:07:16PM -0500, Peter Todd via bitcoin-dev wrote:
> >
> >
> > On January 31, 2023 7:46:32 PM EST, Christopher Allen via bitcoin-dev <bitcoin-dev@lists•linuxfoundation.org> wrote:
> > >All other things being equal, which is better if you need to place a
> > >64-bytes into the Bitcoin blockchain? A traditional OP_RETURN or a spent
> > >taproot transaction such as:
> > >
> > >OP_FALSE
> > >OP_IF
> > >OP_PUSH my64bytes
> > >OP_ENDIF
> >
> > What's wrong with OpPush <data> OpDrop?
> >
>
> This is a technical nit, but the reason is that <data> is limited to 520
> bytes (and I believe, 80 bytes by standardness in Taproot), so if you
> are pushing a ton of data and need multiple pushes, it's more efficient
> to use FALSE IF ... ENDIF since you avoid the repeated DROPs.
Yes, for more than 520 bytes you need to wrap the push in an IF/ENDIF so it's
not executed. But in this example we're just talking about 64 bytes, so that
limit isn't relevant and OpPush <data> OpDrop should be sufficient.
Specifically for more than 520 bytes you run into the the
MAX_SCRIPT_ELEMENT_SIZE check in script/interpreter.cpp, which applies to all
scripts regardless of standardness at script execution:
//
// Read instruction
//
if (!script.GetOp(pc, opcode, vchPushValue))
return set_error(serror, SCRIPT_ERR_BAD_OPCODE);
if (vchPushValue.size() > MAX_SCRIPT_ELEMENT_SIZE)
return set_error(serror, SCRIPT_ERR_PUSH_SIZE);
--
https://petertodd.org 'peter'[:-1]@petertodd.org
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next prev parent reply other threads:[~2023-02-02 11:22 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 [this message]
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
2023-02-18 18:38 ` Aymeric Vitte
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