A multi-signature (multi-sig) wallet is a crypto wallet that needs approvals from several separate keys before it can move funds. It is described as m-of-n: n keys exist and any m of them must sign. A 2-of-3 wallet, for example, survives one lost key and stops a thief who steals only one.
How does a multi-sig wallet work?
An ordinary wallet is controlled by one private key: whoever holds it can sign and send (our explainer on private keys and seed phrases covers the basics). A multi-sig wallet replaces that single key with a rule. A transaction is proposed, each key holder reviews and signs it, and the blockchain only accepts it once the required number of valid signatures is attached.
- On Bitcoin, multi-sig is built into the scripting language: an address can require m of n listed public keys to spend.
- On Ethereum, BNB Smart Chain and other EVM networks, multi-sig is a smart contract account (see how smart contracts work). The contract stores a list of owners and a threshold, and it executes a transaction only when enough owners have signed.
Safe's documentation defines the threshold as "the minimum number of owners required to confirm a transaction before it gets executed". It can be set anywhere from one to the total number of owners.
What do m-of-n setups like 2-of-3 and 3-of-3 mean?
The threshold is a trade-off between protection against theft (more signatures required) and protection against loss (spare keys).
| Setup | Signatures to move funds | One key stolen | One key lost | Typical use |
|---|---|---|---|---|
| 1-of-1 (normal wallet) | 1 | Funds at risk | Funds lost without a backup | Everyday wallets |
| 2-of-2 | 2 | Funds protected | Funds locked without a backup | Two-person approval |
| 2-of-3 | 2 | Funds protected | Still accessible | Individuals and families |
| 3-of-3 | 3 (all) | Funds protected | Funds locked without a backup | Requiring every signer to approve |
| 3-of-5 | 3 | Funds protected (even two stolen) | Still accessible (even two lost) | Organisations and DAO treasuries |
An n-of-n setup such as 3-of-3 gives the strictest approval rule, because every key must sign, so each key needs its own reliable backup.
What is Safe (formerly Gnosis Safe)?
Safe, originally called Gnosis Safe, is open-source smart account software widely used for multi-signature wallets on Ethereum and other EVM networks, including BNB Smart Chain. Each Safe keeps its owner list and threshold on-chain. Safe also supports modules, add-on contracts that can execute transactions without the normal owner signatures, and guards, which run extra checks. When you assess a Safe, check which modules are enabled, because a module can bypass the threshold.
What are the benefits and risks of multi-sig?
- Benefit, theft resistance: one stolen key, device or recovery phrase is not enough to move funds.
- Benefit, loss resistance: with spare keys (m smaller than n), a lost or destroyed key is recoverable.
- Benefit, shared control: treasuries, businesses and families can require several people to approve.
- Risk, complexity: more keys and backups to manage means more room for mistakes.
- Risk, signing what you cannot see: multi-sig does not stop signers who are tricked into approving a malicious transaction; each signer should check the details on a hardware wallet's own screen.
- Risk, independence: the protection depends on how separately the keys are stored and controlled.
- Risk, smart contracts: on EVM chains, security also depends on the contract code and any modules enabled.
Multi-sig vs MPC wallets: what is the difference?
MPC (multi-party computation) wallets also spread control, but differently. An MPC wallet splits one private key into shares held by separate parties or devices, which cooperate to produce a single ordinary signature. On-chain, an MPC wallet looks like a normal one-key wallet, so outsiders cannot see the threshold, and the security depends on the provider's software. A multi-sig wallet's rules sit openly on the blockchain, where anyone can inspect them.
How do you set up a personal multi-sig wallet?
- Choose the software: Safe for EVM networks, or a Bitcoin wallet that supports multi-sig.
- Use separate hardware wallets for each key, ideally from different manufacturers.
- Store each key's recovery phrase in a different place; see our advanced wallet security protections.
- For Bitcoin, also back up the wallet configuration (the list of public keys), which you need to rebuild the wallet.
- Send a small test amount in and out before moving larger sums.
How Wealtii uses multi-sig
Wealtii holds user fund assets 1:1 in a Gnosis Safe 3-of-3 multi-signature vault on BNB Smart Chain at 0x54dd6ADaCe8BFd8feAA9cdf1Ca8891c74FaB2583. Moving vault funds requires all three signatures, and anyone can check the vault's holdings on BscScan. Follow our step-by-step guide to verifying Wealtii's reserves, or read how Wealtii's Gnosis Safe multi-sig custody works. Wealtii is not regulated and has no insurance.
Frequently Asked Questions
What is a 2-of-3 multi-sig wallet?
A 2-of-3 multi-sig wallet has three keys, and any two of them must sign before funds can move. It keeps working if one key is lost, and a thief who steals one key still cannot move anything. It is the most common setup for individuals who want both theft protection and a spare key.
Is a multi-sig wallet more secure than a hardware wallet?
They solve different problems and are often used together. A hardware wallet protects one key from malware. A multi-sig wallet spreads control across several keys, often each on its own hardware wallet, so one stolen or lost device is not enough to lose the funds. Multi-sig adds complexity, so it suits larger balances.
What happens if you lose a key in a multi-sig wallet?
If enough keys remain to meet the threshold, you can still move funds and should replace the lost key. In a 2-of-3 wallet, losing one key is recoverable. In an n-of-n wallet such as 2-of-2 or 3-of-3, every key is required, so losing any one key without a backup locks the funds.
Can you check a Safe wallet's threshold yourself?
Yes. A Safe smart account stores its owner list and signature threshold in its contract on the blockchain, so anyone can read them on a block explorer or in the Safe app. Owner addresses alone do not show who controls the keys.
Sources & References
- Safe Docs — Smart account concepts (owners and threshold) (accessed 21 Oct 2026)
- Safe Docs — Safe modules (accessed 21 Oct 2026)
- Safe Docs — What is Safe? (accessed 21 Oct 2026)
- BIP-11 — M-of-N Standard Transactions (Bitcoin) (accessed 21 Oct 2026)
- BscScan — Wealtii vault address (accessed 21 Oct 2026)
Disclaimer: This content is for educational purposes only and does not constitute financial, tax, or legal advice. Digital assets are volatile and carry risk of loss. Wealtii is early-stage and not regulated.
