The Real-Time
Bitcoin Multisig Coordinator
Stop emailing PSBT files. Coordinate Bitcoin multisig teams instantly.
No accounts ~ No database ~ End-to-End Encrypted
Built for Organizational Resilience
Single-signature wallets are a liability for teams.
Multisig ensures no single person—not even the CEO—is a single point of failure.
Flexible "M-of-N" Consensus
Don't be locked into a rigid structure. Whether you need a 2-of-3 for founders or a 3-of-5 for the board, you define the quorum required to authorize funds.
Mitigate "Key Person" Risk
What if the CEO is in an accident or loses access to their keys? In a multisig setup, the remaining board members can still approve payroll, ensuring business continuity.
Security without the friction
Historically, coordinating a board vote on-chain was slow and painful. SigningRoom fixes this. We combine the governance of multisig with the speed of a real-time chat room.
Why change your workflow?
Manual file merging is error-prone and slow. There is a better way.
Manually merging 5 different email attachments. Files stored permanently on Slack/Google servers. Slow, asynchronous delays between signers.
Real-time merging. Everyone sees the same state. Data lives in RAM, encrypted, and vanishes on expiry. Instant broadcast once signatures are collected.
Orchestrated in Real-Time
The room acts as a blind coordinator, merging signatures as they arrive.
Upload PSBT
Export from Sparrow/Electrum. We encrypt it locally.
Share Link
Send the secure link. The key is in the URL fragment.
Sign & Merge
Signatures are merged automatically. Broadcast once required signatures are collected.
The Blind Relay
We forward your encrypted packets. We never hold the keys.
Technical Standards
Built on open Bitcoin protocols and industrial encryption.
Trusted architecture for
Trust through Architecture
We don't ask you to trust us. We built a system where we don't need to be trusted.
Zero Knowledge
Encryption happens in your browser before data leaves. The backend only sees encrypted blobs and cannot read your transaction details.
No Database
Rooms exist only in RAM. There is no persistent database. Once the session expires, the data is gone forever.
Verifiable Code
The client is open source (GPL v3). You can inspect the cryptography code yourself or build the app locally to verify our claims.
Compatible with your Hardware Wallets & Software
Choose your Security Model
From private individuals to corporate treasuries.
Standard Room
Perfect for hobbyists and friends coordinating small multisigs. No account needed.
Up to 3 Signers 20 Minute Ephemeral Window Zero-Knowledge Encryption
One-Off Boardroom
Single-use session for critical transactions requiring audit trails and full board participation.
Cryptographic Audit Log (PDF) Unlimited Signers (M-of-N) 24-Hour Persistence
Licensed
For organizations and power users who need on-demand infrastructure.
Unlimited Boardrooms Annual Subscription Lifetime Option Available
Frequently Asked Questions
It stays on your hardware wallet or signing device. You only upload a PSBT (Partially Signed Bitcoin Transaction), which contains no private keys, only public data and signatures.
No. Your transaction is encrypted in your browser using a key that is contained in the URL link hash (fragment). This key is never sent to our servers, so we literally cannot decrypt your data.
Yes, for standard use. Basic rooms (max 3 signers, 20 minutes) are free forever.
- Need more time? Extend any room for 5,000 sats.
- Need a pro room? Get a 24-hour Boardroom with unlimited signers for 21,000 sats.
- Team? Grab an annual Corporate License above.
Ready to coordinate?
No accounts required. Just upload a PSBT and share the secure link.
Start New Signing