What Is a Multisig Wallet? Multi-Signature Explained

A multisig wallet is a crypto wallet that needs approval from several private keys, for example any 2 of 3, before a transaction can be executed. It removes the single point of failure of a normal wallet, where one leaked or lost key means lost funds.

Multisig wallet definition

"Multisig" is short for multi-signature. A multisig is described as M-of-N: N keys exist, and M of them must sign. A 2-of-3 wallet has three keys and needs any two; a 3-of-5 has five and needs any three.

Multisigs are used by DAOs, protocol teams and exchanges to hold treasuries and admin permissions, and by individuals who want protection against a single lost device. They are a form of self-custody: no company holds the keys, but no single key holder can act alone either.

How a multisig wallet works

1. The wallet is set up with a list of signer addresses and a threshold (M).
2. One signer proposes a transaction, such as a transfer or a contract call.
3. Other signers review it and add their signatures, usually with hardware wallets.
4. Once M valid signatures exist, the transaction can be executed on-chain. With fewer, it simply cannot.

On Ethereum, multisigs are usually smart-contract wallets (Safe is the best-known). Some chains, including Sui, support multi-signature accounts natively at the protocol level, so the threshold is enforced by the chain itself rather than by a contract.

Multisig wallet example

Say you hold your savings in a 2-of-3 multisig. Key A is on a hardware wallet at home, key B on a second hardware wallet in a safe deposit box, and key C with a trusted family member.

If your house is burgled and key A is stolen, the thief cannot move funds: one key is below the threshold. You use B and C to move everything to a fresh wallet. If you simply lose key A, the same B and C recovery works. A normal single-key wallet would have been lost or drained in both cases.

The trade-off: every transaction now needs two devices, so spending is slower, and if you lose two of the three keys the funds are gone for good.

Why a multisig wallet matters

A multisig is only as strong as the independence of its signers. Two real incidents show the limits:

• In March 2022 attackers took about $625 million from the Ronin bridge after obtaining 5 of its 9 validator keys, the exact threshold, because one organisation effectively controlled five of them (Security Affairs).
• On 21 February 2025, Bybit lost about $1.5 billion from a Safe multisig cold wallet. Attackers had compromised Safe's web front end, so signers approved a transaction that looked like a routine transfer but actually handed over control of the wallet (Wilson Center).

The lessons: keep signer keys on separate devices and with separate people, verify what you are signing on the hardware wallet screen rather than trusting a website, and treat a protocol's multisig setup as part of checking whether a DeFi protocol is safe. A protocol whose admin keys sit with one person is not meaningfully decentralized, whatever the threshold says.

Related terms

• Seed phrase — the backup words that recreate a single wallet's keys.
• Non-custodial wallet — a wallet where you, not a company, hold the keys.
• Hot wallet vs cold wallet — online versus offline key storage, often combined in a multisig.
• DAO — community-run organisations that often keep treasuries in multisigs.
• Rug pull — an exit scam that a well-distributed multisig can make harder.

Learn more on the JewelSwap blog

• Self-custody crypto guide — how to hold your own keys and where a multisig fits.
• How to check a DeFi protocol is safe — what to look for in a protocol's admin keys and upgrade powers.
• Best self-custody wallets in 2026 — wallet options, including ones that support multi-signature setups.

Frequently asked questions

What does multisig mean?

Multisig means multi-signature: a wallet that requires signatures from several private keys, such as 2 of 3, before a transaction is valid.

Multisig vs single-signature wallet: which is safer?

A multisig removes the single point of failure, so one stolen or lost key cannot drain or lock the funds. It is slower and more complex, and it only helps if the keys are held independently and signers verify what they sign.

Can a multisig wallet be hacked?

Yes. If an attacker controls enough keys to meet the threshold, or tricks signers into approving a malicious transaction, the funds can be taken. The Ronin bridge (2022) and Bybit (2025) losses both involved multi-signature setups.

JewelSwap Crypto Glossary · educational, not financial advice. Updated 2 October 2026. Browse the full glossary.