Multisignature

Multisignature, often shortened to multisig, is a security and governance method where more than one cryptographic signature is required to authorize a blockchain transaction. Instead of relying on a single private key, a multisig wallet uses multiple keys and enforces a rule such as “2-of-3” or “3-of-5” signatures before funds can move.

In a multisig arrangement, each participant controls their own key, and the wallet or smart contract validates that the required threshold of signatures is present. For example, in a 2-of-3 wallet, any two of the three key holders can approve a withdrawal, but one person alone cannot. This can be implemented at the protocol level in some systems or through smart contracts on programmable blockchains. Functionally, multisig turns custody into a shared process, where transaction approval becomes a coordinated action rather than a single point of failure.

Multisig is widely used by teams, DAOs, and businesses to manage treasury funds. A project might require approvals from a founder, a finance lead, and an independent advisor, so no single actor can unilaterally move funds. It is also used for personal security, such as splitting keys across devices or trusted parties to reduce the risk of theft, loss, or coercion. Some custodial services and exchanges also use multisig-like controls internally to reduce insider risk, although users may not always see the policy directly.

Multisig reduces single-key risk and creates clearer accountability, but it introduces coordination overhead and can complicate recovery if key holders become unavailable. In the broader crypto ecosystem, multisignature is a foundational tool for safer self-custody and more transparent shared control of assets, supporting everything from personal wallets to institutional-grade treasury management.