Last updated: October 22, 2026
A multisig (multi-signature) wallet needs several keys to approve a transaction — for example 2-of-3, where any two of three keys can sign — so one lost, stolen or coerced key can't drain your funds. It's the standard way to secure large holdings, company treasuries and inheritance plans. Multisig is native on Bitcoin, built with smart contracts on Ethereum, and supported (though complex) on Monero. It protects keys, not privacy — for that, pair it with private coins acquired via swaps like BTC → XMR.
- m-of-n keys must sign
- 2-of-3 most common setup
- 1 lost key is survivable
- No single point of failure
Common multisig setups at a glance
| Setup | Who holds keys | Good for |
|---|---|---|
| 2-of-3 personal | You hold 3 devices in different places | Large savings; survives loss of one device |
| 2-of-3 with heir/lawyer | You, an heir, a trusted third party | Inheritance |
| 2-of-3 escrow | Buyer, seller, arbiter | Trades with strangers |
| 3-of-5 organization | Several team members | Company or DAO treasuries |
How multisig works on different chains
- Bitcoin: native multisig scripts; desktop wallets such as Sparrow or Electrum coordinate several hardware wallets. You must back up every seed and the wallet descriptor (the list of public keys).
- Ethereum and EVM chains: smart-contract wallets implement multisig. Convenient, but the contract and its web interface add risk — always verify what you sign on the hardware device.
- Monero: supports multisig, used for example by Haveno-based P2P trading; wallet support is more limited and setup more involved.
Benefits and trade-offs
- Theft resistance: one compromised device or seed isn't enough.
- Coercion resistance: you physically can't move everything alone — useful against wrench attacks.
- Loss tolerance: lose one key, still recover with the others.
- Trade-off — complexity: more backups, more steps, and mistakes in setup or backups (especially the descriptor) can lock funds.
- Trade-off — cost: multisig transactions are larger, so fees are somewhat higher — see Bitcoin fees.
How to set up a 2-of-3 multisig (step by step)
- Get three signing devices, ideally from different manufacturers (buy them privately).
- Initialize each device with its own new seed and back each seed up separately.
- Create the multisig wallet in a coordinator app by importing each device's public key.
- Back up the wallet descriptor with every seed — you need it to rebuild the wallet.
- Test: receive a small amount, then spend it using two devices.
- Store devices and seeds in different places.
Frequently asked questions
What is a multisig wallet?
A wallet that requires more than one key to authorize a transaction, such as two out of three keys, so no single key can move the funds.
Is multisig safer than a single hardware wallet?
Yes, if set up and backed up correctly: it removes the single point of failure. It's also more complex, so test recovery before storing large amounts.
What happens if I lose one key in a 2-of-3?
You can still spend with the other two and should move funds to a new multisig with a fresh third key.
Does Monero support multisig?
Yes, but it's more complex and supported by fewer wallets than Bitcoin multisig. It's used in some P2P trading systems.
Does multisig make transactions private?
No. It secures keys. On Bitcoin, multisig spends can even be identifiable on-chain. For privacy, use Monero — see Monero vs Bitcoin.
Secure what you swap in: BTC → XMR, USDT → BTC or read hot vs cold wallets. No account, no ID, no logs.