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Last updated 2026-11-05

What Is a Multi-Sig Wallet?

A multi-sig wallet requires several approvals before a transaction can execute. This page explains the threshold model, what shared control changes in practice, and why an invitation you did not request deserves suspicion.

Who this is for

Teams, families, and treasury managers who want no single person to be able to move funds, and anyone who has been asked to co-sign a transaction.

What it is

Multi-sig means multiple signatures. The usual form is a threshold, written m-of-n: a wallet with n keys where any m of them can approve a transaction. A 2-of-3 wallet needs two of its three keys; a 3-of-5 needs three of five.

With 2-of-3, one lost key does not lock the funds, and one stolen key cannot move them alone. Neither guarantee holds with 1-of-2 or with 2-of-2, where the loss of a single key can strand the balance.

On EVM networks, most multi-sig wallets are smart contracts rather than key pairs. The address belongs to a contract that holds the BTG and checks the collected signatures against its own list of owners and rules. Whether a specific product supports Bitgold is a separate question; the model described here applies to wallets that support the feature.

Why it matters

Shared control changes what a single phishing victim can lose. If a Bitgold treasury uses 3-of-5, one compromised signer produces one signature and nothing else. The payment does not move until two more people approve it, and those people have a chance to notice that the destination is wrong.

The price is coordination. Someone proposes, the others inspect the details, and everyone signs from their own device rather than from a screenshot in a chat. A key loss becomes an operational event: replace the lost key before the wallet falls below its threshold, or you may be unable to move funds at all.

Unsolicited invitations are a known trap. An attacker creates a multi-sig wallet they control, adds you as a signer, and asks you to approve a transaction that looks routine but grants them control. Refuse invitations you did not expect, and read the full transaction before you sign anything.

Common misunderstandings

  • "Multi-sig means the funds are protected from every mistake." It distributes signing authority. It does not review the transaction for you, and a majority can still approve a bad one.
  • "If one signer loses a key, the funds are gone." With m-of-n where m is less than n, one loss is survivable. That margin is the reason to choose n above m.
  • "Any multi-sig request is a security feature." An unsolicited one is a common way to make you a co-signer on someone else's trap.
  • "Signers can approve from a link in the group chat." Each signer should verify and sign through their own wallet interface.

Key takeaways

  • Multi-sig uses a threshold: m signatures out of n keys.
  • Shared control removes the single point of failure that one key represents.
  • Coordination and key replacement are ongoing costs, not setup steps.
  • An unexpected multi-sig invitation is a reason to stop, not to help.

Next steps