I built a stateless, client-side encrypted room for merging PSBTs (Open Source)

Hey r/Bitcoin,

I’ve been coordinating multisig transactions for a while, and I got annoyed with the workflow of emailing PSBT files back and forth or pasting hex data into chat apps. It felt leaky and cumbersome.

I wanted a "Zoom-style" experience for multisig: spin up a secure room, do the signing live, and have the whole room vanish when we're done. No accounts, no history.

So I built Signing Room.

https://i.redd.it/cg5az13zx8ag1.gif

It’s a stateless coordination layer.

• No Database: The "room" runs on Cloudflare Durable Objects and exists only in memory.
• Ephemeral: When the session expires (20 mins), the data is wiped.
• Private: The encryption key is generated in your browser (URL fragment). The server only sees encrypted blobs.

The Stack:

• Frontend: Angular
• Backend: Cloudflare Workers (Hono)
• Payments: Lightning (LNBits)

It is Free and Open Source (AGPLv3).

The only paid feature is for larger groups/audit logs, which I added to cover the server costs via LNBits. But for standard 2-of-3 multisig, it’s free.

Link: signingroom.io Code: https://github.com/scarlin90/signingroom

I’d love for you guys to try it or tell me what features I missed.

Cheers, Sean