bb84 Multisig

Status: Planned · Group: Identity & security

Treasuries that need more than one post-quantum key.

bb84 Multisig is a vault controlled by M of N Falcon-512 keys. Each key is registered once on-chain with its QPU receipt, and a spend needs enough valid Falcon signatures before funds move.

How it works: M-of-N post-quantum treasuries

1. Set up. Choose the signers and the threshold, for example 2-of-3 across phone, laptop and guardian. Each signer registers a Falcon-512 key.
2. Propose. A signer proposes a spend: the exact instructions, a nonce and an expiry.
3. Approve. Other signers add their Falcon signatures. Each is verified on-chain against its registered key.
4. Execute. Once the threshold is met, the instructions run with the multisig wallet as signer. A relayer pays the fee.

What it gives you

• M-of-N Falcon-512 keys
• Hybrid mode before Q-Day: Ed25519 and Falcon
• Works behind a Quantum ID (dao.quantum)
• Each key registered with its QPU receipt

Notes

• Hybrid mode before Q-Day: require Ed25519 and a Falcon signature, convenient today and safe on Q-Day.
• Each Falcon verification costs about 300k CU, so approvals are spread over several transactions.
• Pairs with : dao.quantum can hold a 2-of-3 post-quantum multisig.

Related

bb84 Vault · Quantum ID · All products