Glossary · compliance and risk
What is MPC?
MPC, multi-party computation, is a way of splitting a private key so that no single person or machine ever holds the whole thing. Signing a transaction requires several parties to cooperate, and the complete key is never assembled anywhere.
What problem it solves, and how it differs from multisignature
A private key is a single point of failure. Whoever has it can move the funds, so anyone holding crypto for other people has to solve the problem of how to use a key without any one party being able to abuse it.
The older answer is multisignature: several separate keys, and a transaction needs a quorum of them to sign. It works, it is visible on-chain, and it is implemented per network so support varies.
MPC takes a different route. One key is mathematically split into shares held by different parties, and they compute a valid signature together without ever reconstructing the key. The chain sees an ordinary signature, so it works the same way on any network.
For a business the practical difference is mostly operational. MPC gives finer-grained control over who has to participate, works uniformly across networks, and does not reveal the arrangement on-chain. It is why most institutional custodians use it.
Why a merchant might care
Three reasons, though none of them requires you to run MPC yourself.
No single point of compromise
There is no complete key to steal, from a person, a server or a backup.
Frequently asked questions
Is MPC the same as multisignature?
No. Multisignature uses several separate keys and a quorum. MPC splits one key into shares that jointly produce a single ordinary signature. The chain cannot tell MPC was used.
Is MPC safer?
It removes the complete key as a target and works uniformly across networks. Whether a given implementation is safer than a given multisignature setup depends on the implementation.
Do I need MPC to accept crypto payments?
No. It is a technique custodians use. As a merchant you are choosing a custodian, not a signing scheme.
Why does the term keep appearing in custody marketing?
Because it is the current institutional standard, and because it is a genuine improvement on holding one key in one place.