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Date: Sun, 20 Apr 2025 08:43:46 +0000
From: Peter Todd <pete@petertodd.org>
To: Antoine Poinsot <darosior@protonmail.com>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
Subject: Re: [bitcoindev] Relax OP_RETURN standardness restrictions
Message-ID: <aASzwkFfGFBYudK_@petertodd.org>
References: <rhfyCHr4RfaEalbfGejVdolYCVWIyf84PT2062DQbs5-eU8BPYty5sGyvI3hKeRZQtVC7rn_ugjUWFnWCymz9e9Chbn7FjWJePllFhZRKYk=@protonmail.com>
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On Thu, Apr 17, 2025 at 06:52:34PM +0000, 'Antoine Poinsot' via Bitcoin Dev=
elopment Mailing List wrote:
> Hi,
>=20
> Standardness rules exist for 3 mains reasons: mitigate DoS vectors, provi=
de upgrade hooks, or as a nudge to deter some usages.
>=20
> Bitcoin Core will by default only relay and mine transactions with at mos=
t a single OP_RETURN output, with a scriptPubKey no larger than 83 bytes. T=
his standardness rule falls into the third category: it aims to mildly dete=
r data storage while still allowing a less harmful alternative than using n=
on-provably-unspendable outputs.
>=20
> Developers are now designing constructions that work around these limitat=
ions. An example is Clementine, the recently-announced Citrea bridge, which=
uses unspendable Taproot outputs to store data in its "WatchtowerChallenge=
" transaction due to the standardness restrictions on the size of OP_RETURN=
s[^0]. Meanwhile, we have witnessed in recent years that the nudge is ineff=
ective to deter storing data onchain.
>=20
> Since the restrictions on the usage of OP_RETURN outputs encourage harmfu=
l practices while being ineffective in deterring unwanted usage, i propose =
to drop them. I suggest to start by lifting the restriction on the size of =
the scriptPubKey for OP_RETURN outputs, as a first minimal step to stop enc=
ouraging harmful behaviour, and to then proceed to lift the restriction on =
the number of OP_RETURN outputs per transactions.
I would suggest removing both limits at the same time.
While multiple OP_Return outputs are more expensive than a single one
for the same amount of total data. In some cases they're necessary for
technical reasons, e.g. if signing with SIGHASH_SINGLE.
--=20
https://petertodd.org 'peter'[:-1]@petertodd.org
--=20
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aASzwkFfGFBYudK_%40petertodd.org.
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