What a bank would do — and what you do instead
A bank keeps your money in its vault and verifies you with ID, passwords and a fraud team. When you self-custody, the vault is a device or a set of keys, and the “fraud team” is your own habits. There is no reset button and no branch to visit, so the routines in this guide — writing things down, testing recovery, sending small amounts first — do the work a bank’s back office normally does. The upside is that nobody can freeze, lend out or lose your coins on your behalf.
The problem multisig solves
A single-key wallet has two failure modes: the key is stolen, or the key is lost. A bank solves both with paperwork and a call centre. Multisig solves them with math. In a 2-of-3 setup, a thief who steals one key cannot move funds, and you can still move funds if you lose one key.
Common family setups
| Setup | Who holds keys | Good for |
|---|---|---|
| 2-of-3, all family | Two spouses plus a key in a safe-deposit box | Couples who want joint control |
| 2-of-3, with a helper | You, a family member, and a collaborative-custody service | People who want a backstop without giving up control |
| 3-of-5 | Several family members and locations | Larger amounts and multi-generation planning |
Bitcoin supports multisig natively. On Ethereum and other smart-contract chains, multisig is a contract wallet such as Safe. The ideas are the same; the tools differ.
Setting one up
Frequently asked questions
Is multisig overkill for small amounts?
Often, yes. Many people start with a single hardware wallet and move to multisig once a loss would be life-changing.
What happens to multisig funds if I die?
Your heirs can move funds if they can gather enough keys and the configuration. That only works if you documented the process clearly in advance.
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