Multisig: what it means for a company

How it works

Multisig is short for multi-signature. The wallet is built from several independent keys, and the spending rule written into the bitcoin script says how many of them must sign. In a 2 of 3 arrangement there are three keys and any two can approve a payment. BIP 11 described the standard M of N form in 2011, and modern wallets use the same idea with newer address types.

Each key normally lives on its own hardware signing device, held by a different person or in a different place. When the company wants to pay, the wallet prepares a transaction and passes it to the signers, usually as a PSBT file. Each signer checks the details on their own device screen and adds a signature. Once enough signatures are attached, the transaction can be broadcast.

Why it matters for a company

A company treasury is a control problem as much as a technology one. Multisig turns a rule the board already understands, two people must approve a payment, into something the network itself enforces. It also removes the single point of failure that a one-key wallet creates: a lost device, a departed director or a stolen recovery phrase does not, on its own, lose or release the funds. This is why the site does not recommend single-signature wallets for company money.

The cost is process. Somebody has to keep a record of where each key is, who holds it by role, and how to rebuild the wallet. The wallet descriptor, which lists every public key and the threshold, must be backed up alongside the keys, because without it a 2 of 3 wallet can be hard to reconstruct even with two keys present.

Common mistakes

• Storing two of the three keys in the same building, so one fire or burglary defeats the threshold.
• Backing up the recovery phrases but not the descriptor.
• Never testing recovery. A yearly drill shows whether the backups actually work.
• Letting one person hold enough keys to meet the threshold alone.

Related

• Quorum
• Collaborative multisig
• Descriptor
• PSBT
• Single-signature wallet
• Multisig for a company
• All glossary terms

Sources

Primary sources only. Each link was checked on 9 November 2026. Rules change, so confirm the current version with your adviser.

1. Bitcoin BIPsBIP 11: M of N standard transactions (multisig)
2. Bitcoin BIPsBIP 174: Partially Signed Bitcoin Transaction format (PSBT)
3. Bitcoin BIPsBIP 380: Output script descriptors, general operation (wallet backups and exports)
4. NISTSP 800-57 Part 1 Rev. 5: Recommendation for key management