Subject: Re: [bitcoindev] [BIP Proposal] Mempool Validation and Relay Policies via User-Defined Scripts

From: Greg Maxwell <[email-masked]>
Date: Wed, 24 Sep 2025 18:46:06 +0000

This appears to substantially misunderstands the purpose of the mempool
broadly in the network-- it's purpose is to model what will get mined.  If
you're not doing that you might as well set blocks only.
Significant discrepancies are harmful to the system and promote
centralization and fail to achieve a useful purpose in any case.  What
marginal benefits might be provided do not justify building and deploying
the technological infrastructure for massive censorship.

If you think this is important, I advise you to select another
cryptocurrency which is compatible with such authoritarian leanings.  --
though I am unsure if any exist since it is such a transparently pointless
direction.

On Wed, Sep 24, 2025 at 6:30 PM Aiden McClelland <[email-masked]> wrote:

> Hi all,
>
> I'd like to share for discussion a draft BIP to allow for a modular
> mempool/relay policy: https://github.com/bitcoin/bips/pull/1985
>
> I think it could potentially reduce conflict within the community around
> relay policy, as an alternative to running lots of different node
> implementations/forks when there are disagreements.
>
> I am working on a reference implementation using Bellard's QuickJS, but it
> has been almost a decade since I've written C++, so it's slow going and I'm
> sure doesn't follow best-practices. Once it's working, it can be cleaned up.
>
> Thanks,
> Aiden McClelland
>
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