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Date: Sat, 26 Apr 2025 07:35:44 -0400
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Subject: Re: [bitcoindev] Relax OP_RETURN standardness restrictions
To: Sjors Provoost <sjors@sprovoost.nl>, bitcoindev@googlegroups.com
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X-Spam-Score: -0.8 (/)
On 4/26/25 06:53, Sjors Provoost wrote:
>
> Op 26 apr 2025, om 11:50 heeft Luke Dashjr <luke@dashjr.org> het=20
> volgende geschreven:
>>
>> It should be needless to say, but this idea is utter insanity.=20
>> Disappointing to see positive responses, and not one sensible reply=20
>> calling it out yet. The bugs should be fixed, not the abuse embraced.=20
>> If attackers continue to bypass filters, we can go back to a full=20
>> whitelist approach.
>>
> Are you proposing a whitelist of authorised public keys?
Scripts, of course, not specific keys. Just like we had early on. But=20
that is only necessary if the simpler filter steps are insufficient,=20
which is unlikely.
> Your earlier proposal [0] to whitelist certain script forms is not=20
> relevant here, because the Citrea white paper uses unspendable public=20
> keys to encode the data that doesn't fit in OP_RETURN.
>
> To stop that, you'd have to introduce a rule that only allows=20
> spendable public keys to be put on chain. Afaik, the only way to do=20
> that is to require a signature. That would dramatically increase the=20
> size of all output scripts.
Only during flood relay. They don't need to be included in blocks. Even=20
a softfork, should it become necessary, could potentially get away with=20
pruning them after being buried a certain depth.
> And that won't fix "spam" either, because you can still grind the=20
> first N bits of every public key and/signature, maybe encode things in=20
> the nonce, etc.
It's sufficient to make spam unwelcome and costly. No spam filtration=20
solution needs to be perfect. Every little bit helps.
> As for your earlier proposals (Ordisrespector, etc), they were not=20
> useful in general, because they rely too heavily on having=20
> standardness rules go against financial incentives. Only consensus=20
> changes can work, but so far you haven't proposed those.
That's nonsense. They were and continue to be very effective, even with=20
only a small amount of adoption. Further, mining centralization and=20
pools denying miners options has been the biggest barrier to that=20
adoption. There is no significant financial impact either, that's just=20
FUD; miners using the fixed and improved spam filters have in fact=20
earned significantly more than miners using Core.
> Since "spam" is a cat-and-mouse game, and consensus changes take ages=20
> to design, implement and roll out, it's also not a viable solution.
It would be a pain, but it is definitely viable. Thankfully, policy=20
works just fine for spam filtration, and can be adapted much quicker.
> Increasing the OP_RETURN limit reduces harm compared to the two=20
> alternatives:
> 1. UTXO set bloating with fake public keys
> 2. Large scale bypassing of the (default) mempool, which leads to
> =C2=A0 =C2=A0a) compact block relay failures (mempool fragmentation)
The entire reason compact blocks were acceptable, is that miners are=20
incentivized to conform to non-miner node policies. Now you're trying to=20
bait-and-switch it to nodes conforming to malicious miner policies instead.
> =C2=A0 =C2=A0b) centralisation
No, this is more FUD.
> Custom-but-public relay networks like Libre Relay don't cause (2b),=20
> but (likely) do cause (2a). So it's not good if Bitcoin Core default=20
> policy heavily incentives such an alternative network. That's one=20
> reason why -mempoolfullrbf is now a default.
>
> You're also not specifying what problem you're trying to solve. Nor=20
> what "damage" is done. If blocks are too big in your opinion, then why=20
> not simply propose a block size decrease (again)? I would not expect=20
> meaningful support for that either, but at least it's simple.
>
> - Sjors
>
> [0]=C2=A0https://github.com/bitcoin/bitcoin/issues/29187
>
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