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From: Nagaev Boris <bnagaev@gmail.com>
Date: Sun, 4 May 2025 17:04:23 -0300
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Message-ID: <CAFC_Vt41NOmM1Mscri+=SEPzPLb+Z83R2FzZkQuTVbBfGssMug@mail.gmail.com>
Subject: Re: [bitcoindev] Re: Relax OP_RETURN standardness restrictions
To: Peter Todd <pete@petertodd.org>
Cc: "/dev /fd0" <alicexbtong@gmail.com>,
Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
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On Fri, May 2, 2025 at 7:23=E2=80=AFPM Peter Todd <pete@petertodd.org> wrot=
e:
>
> On Fri, May 02, 2025 at 12:04:13PM -0700, /dev /fd0 wrote:
> > Config `mempoolfullrbf` was added in July 2022:
> > https://github.com/bitcoin/bitcoin/pull/25353
> > It was made default in August 2024:
> > https://github.com/bitcoin/bitcoin/pull/30493
> > Option was removed in November 2024:
> > https://github.com/bitcoin/bitcoin/pull/30592
> >
> > `datacarrier` and `datacarriersize` already exist, so why is it a big d=
eal
> > to remove them after a few months of monitoring the usage with stats?
>
> The `mempoolfullrbf` option was a good example of how keeping an option
> to reject otherwise standard transactions is just wasted effort. Having
> the option didn't stop full-rbf replacements from getting mined; user's
> refusing to relay a transaction type that a significant % of miners are
> mining acomplishes nothing.
>
> In that *specific* case there were a tiny number of users, Wasabi's
> Coordinator being an example, where for technical reasons full-rbf
> replacements caused problems until that code was fixed; giving those
> users an option to temporarily disable those replacements was sort of
> useful. But there's no reason to think that will be true with OP_Return
> outputs, and in any case, you can just delaying upgrading your node
> while you fix your broken code.
>
If I understand correctly, the Wasabi bug is described in this issue:
https://github.com/WalletWasabi/WalletWasabi/issues/10648
It was opened in May 2023. If the option hadn't been available at that
time, it would have been much harder for Wasabi coordinators to
mitigate the issue =E2=80=94 they would have had to patch Bitcoin Core or u=
se
an alternative node implementation, rather than just toggling a
setting.
Also note that the bug in Wasabi was discovered after mempoolfullrbf
was added in July 2022. The first Bitcoin Core release to include this
change was v24.0.1, in December 2022. It took several months after
that release for the Wasabi team to realize that mempoolfullrbf=3D1
created problems for their use case. If the feature had been released
without a flag (enabled by default with no way to disable it) it would
have made things significantly harder for them.
There may also be users today who rely on datacarrier
behaviour/options without yet realizing they're scheduled for removal.
If the options are simply relaxed in the next release, users could
still set the values they need and have time to adjust their
infrastructure. It would give them a chance to move away from relying
on those settings before they're removed entirely in a future version.
Otherwise, they may be forced to either switch to another node
implementation or remain on version 29.
--=20
Best regards,
Boris Nagaev
--=20
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