From: "'Sean Carlin' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>
To: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
Subject: [bitcoindev] [BIP Draft] Blind Relay: Stateless Encrypted WebSocket Coordination for PSBTs
Date: Wed, 25 Mar 2026 05:00:13 -0700 (PDT) [thread overview]
Message-ID: <3f1a1491-06e1-4453-9538-fa66bc432a06n@googlegroups.com> (raw)
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Hi everyone,
I'd like to propose a new BIP for real-time, trust-minimized coordination
of multi-signature PSBTs.
The Problem
Coordinating N-of-M Bitcoin transactions currently forces users into a
binary choice:
- Manual out-of-band transfers (USB drives, secure messengers) that
preserve privacy but introduce high friction and error risk, or
- Stateful coordination servers that offer good UX but act as privacy
honeypots, logging metadata, signer relationships, and often storing PSBTs
on disk.
The Proposal: Blind Relay
This BIP introduces a "Blind Relay" - an ephemeral, stateless,
zero-knowledge WebSocket relay. All payloads are encrypted client-side with
AES-GCM-256, with decryption keys held exclusively in client-side URL
fragments (never sent to the server). The relay operates entirely in RAM
with a strict 24-hour TTL and self-destructs upon completion, providing
real-time coordination without persistent metadata or disk storage.
A reference implementation has been running in production for three months,
successfully facilitating real multisig ceremonies.
*Links*
- BIP Draft:
https://github.com/scarlin90/bip-stateless-psbt-coordination/blob/main/bip-draft.md
- Source Code: https://github.com/scarlin90/signingroom
- Live Client: https://signingroom.io
- Related Research Paper: https://arxiv.org/abs/2601.17875
I look forward to your technical feedback - especially on the
specification, security model, edge cases, and any suggested improvements.
Best regards,
Sean Carlin
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next reply other threads:[~2026-03-25 12:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-25 12:00 'Sean Carlin' via Bitcoin Development Mailing List [this message]
2026-03-26 0:15 ` pyth
2026-03-26 16:19 ` 'Sean Carlin' via Bitcoin Development Mailing List
2026-03-26 14:02 ` [bitcoindev] " Thomas Suau
2026-03-26 16:02 ` 'Sean Carlin' via Bitcoin Development Mailing List
2026-04-03 11:03 ` 'Sean Carlin' via Bitcoin Development Mailing List
2026-04-06 20:12 ` STEVEN SLATER
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