Setup for personal use
- Pick M-of-N threshold. For individuals: 2-of-3 with keys at home, office, and a relative. For couples: 2-of-2.
- Each signer needs their own wallet (ideally hardware wallets)
- Deploy Safe contract (one-time gas cost ~$20)
- Transfer funds in over time
Why multi-sig matters
- Single-key loss = total loss. Multi-sig = can recover with other keys.
- Single-key compromise = total theft. Multi-sig = attacker needs multiple keys.
- Enables inheritance plans (give third key to lawyer / family).
Cost and complexity
Each transaction needs multiple signers to approve — slower. Gas costs slightly higher. For active traders, cumbersome; for savings, essential.