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Multisig
Multisig (multi-signature) is a setup where moving funds needs approval from several keys instead of one, for example any 2 of 3. Each key can be held on a different device or by a different person.
What it means for you. One stolen or lost key is not enough to move or lose the funds, but losing more keys than the setup can spare locks them permanently. Record which keys exist, who holds each, and the full wallet setup needed to restore it, not only the seed phrases.
Sources: BIP-11: M-of-N standard transactions, bitcoin.org: Secure your wallet, Bitcoin developer guide: Transactions · checked 4 October 2026
MPC wallet
An MPC wallet uses multi-party computation: the signing key is split into shares held by separate parties or devices, and a set number of them work together to sign. No single share can sign alone, and the full key need never exist in one place.
What it means for you. Who holds the shares decides who controls the funds: if a company holds some, it can block or delay withdrawals. Check how many shares are needed, where each is kept, and whether you can export a usable backup if the provider shuts down.
Sources: NIST CSRC: Threshold cryptography, NIST IR 8214: Threshold schemes for cryptographic primitives, BIP-11: M-of-N standard transactions · checked 4 October 2026