What is Multisig?

Multisig, short for multi-signature, is a wallet setup that needs more than one signer to authorise a transaction. A common arrangement requires, say, two of three keyholders to approve before funds move. This removes the single point of failure that a normal wallet has, where one leaked key means total loss.

This matters for anyone protecting significant funds or running a shared treasury. Even if one key is stolen or one signer is compromised, an attacker still cannot move the money without the other required approvals.

Example: a small team holds a project treasury in a two-of-three multisig, so any payment needs two of the three founders to sign, and losing one key does not endanger the funds.

Safety note: multisig greatly improves security but adds complexity, and you must safely back up and separate each key so they cannot all be lost or stolen together. Use well-established multisig software, and be careful when adding or removing signers. For individuals, it is a strong upgrade over relying on a single seed phrase. Related terms include EOA, smart contract wallet, hardware wallet, and self-custody.