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

From: Aiden McClelland <[email-masked]>
Date: Wed, 24 Sep 2025 11:18:22 -0700 (PDT)

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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