Date: Wed, 1 Feb 2023 14:02:41 +0000
From: Andrew Poelstra <apoelstra@wpsoftware.net>
To: Peter Todd <pete@petertodd.org>,
 Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Message-ID: <Y9pxAdm3kO1rr2kU@camus>
References: <CACrqygAMsO1giYuxm=DZUqfeRjEqGM7msmEnZ-AHws3oA2=aqw@mail.gmail.com>
 <764E460B-C0C6-47B8-A97E-F7CBC81FD645@petertodd.org>
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In-Reply-To: <764E460B-C0C6-47B8-A97E-F7CBC81FD645@petertodd.org>
Subject: Re: [bitcoin-dev] Debate: 64 bytes in OP_RETURN VS taproot OP_FALSE
 OP_IF OP_PUSH
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On Tue, Jan 31, 2023 at 09:07:16PM -0500, Peter Todd via bitcoin-dev wrote:
>=20
>=20
> On January 31, 2023 7:46:32 PM EST, Christopher Allen via bitcoin-dev <bi=
tcoin-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
>=20
> 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.

--=20
Andrew Poelstra
Director of Research, Blockstream
Email: apoelstra at wpsoftware.net
Web:   https://www.wpsoftware.net/andrew

The sun is always shining in space
    -Justin Lewis-Webster


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