What is a multisig wallet?
One key is one point of failure. Multisig spreads control across several keys so no single loss or theft decides everything.
On this page
A multisig (multi-signature) wallet needs approvals from several private keys before funds can move. It is described as m-of-n: for example, a 2-of-3 wallet has three keys and any two must sign. One lost key does not lock you out, and one stolen key is not enough for a thief.
How does an m-of-n multisig work?
Ethereum.org's glossary defines multisig as a wallet or account that requires multiple signatures or approvals to execute a transaction. Bitcoin's developer documentation shows the mechanics: the locking script lists n public keys and demands at least m valid signatures from the matching private keys. Its worked example is 2-of-3, often wrapped in a pay-to-script-hash (P2SH) address. On Ethereum, the same rules can be written into a contract account, which ethereum.org explains is controlled by code rather than by a single key.
What does each set-up protect against?
The trade-off is simple arithmetic: you can lose up to n − m keys and still spend, while an attacker needs m of them.
| Set-up | Keys you can lose and still spend | Keys a thief must steal |
|---|---|---|
| 1-of-1 (normal wallet) | 0 | 1 |
| 2-of-3 | 1 | 2 |
| 3-of-5 | 2 | 3 |
What are the downsides of multisig?
More keys mean more set-up and more to manage. Every signer must keep their key safe and backed up; a careless m-of-n design can lock funds as surely as a lost single key — a 3-of-3 wallet, for instance, cannot survive any loss. Each signature also has to be gathered before a payment goes out, which slows things down. And contract-based multisig on Ethereum relies on the contract's code being correct; see what is a smart contract. Multisig pairs well with cold storage and hardware wallets for the individual keys.
Questions readers ask
Is multisig only for companies?
No. Individuals use it too, for example to split keys across devices or with a trusted person, but it adds complexity that a single-key wallet does not have.
Does a multisig wallet have a normal address?
Yes. Senders see an ordinary-looking address; the signing rules live in the script or contract behind it.
Multisig replaces one point of failure with a rule: any m of n keys. Choose the numbers so that losing a key does not lock you out and stealing one does not get anyone in, and store each key with the same care as a single wallet. Start with crypto wallets explained.
Sources
- Bitcoin Project (developer.bitcoin.org), Transactions (Bitcoin developer guide) (2026)Primary source
- Bitcoin Project (developer.bitcoin.org), Bitcoin developer glossary (2026)Primary source
- ethereum.org, Ethereum glossary (2026)Primary source
- ethereum.org, Ethereum accounts (developer documentation) (2026)Primary source
Educational content only — not financial, investment, legal or tax advice. Crypto-assets are high-risk and you could lose all the money you put in. Rules differ by country; check with your national regulator. See our risk disclosure and editorial policy.
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