A multisignature wallet requires more than one key to authorize a transaction. A 2-of-3 wallet needs two signatures from three possible keys. A 3-of-5 wallet needs three from five. The setup removes the single point of failure that comes with one private key. A company treasury might use a 3-of-5 multisig so that no single employee can move funds. A family might use a 2-of-3 setup where one key is held by each spouse and a third is stored in a safe.

Multisig is standard practice for DAOs, exchanges, and Bitcoin custody services. It also protects against loss. If one key is lost or destroyed, the remaining keys can still authorize transactions as long as the threshold is met. The trade-off is complexity. Every signer needs a hardware wallet and a clear process. A disorganized multisig can lock funds forever if signers cannot coordinate. Bitcoin has supported multisig natively since 2012. Ethereum uses smart contract wallets like Safe to achieve the same result. Multisig is not for everyone, but for any wallet holding serious value, it is the responsible choice.

Common multisig configurations

• 2-of-3 — small teams, family custody
• 3-of-5 — company treasuries, DAOs
• 4-of-7 — exchanges and institutional custody
• 2-of-2 — joint accounts, both parties must sign

Multisig trades convenience for security. The extra steps are the point. They make theft and loss much harder.