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

From: "/dev /fd0" <[email-masked]>
Date: Sun, 28 Sep 2025 06:52:28 +0530

Hi Aiden,

There is an easy solution based on my understanding of [transaction
validation][0] although I have not tested it:

1. Add a config option `txnotify` similar to `blocknotify` that executes
commands or script when a new transaction is received from a peer.
2. Add a function `ExecuteTxNotify()` that will run the script provided by
the user in step 1. Script should either return 'accept' for 'reject' and
function would return true/false accordingly.
3. Call `ExecuteTxNotify()` in ` AcceptToMemoryPool()` so that rejected
transactions do not enter the mempool.

[0]: https://bitcoincore.academy/transaction-validation.html

/dev/fd0
floppy disk guy

On Thu, Sep 25, 2025 at 12:00 AM 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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