How Does MPC Differ from a Traditional Multi-Signature (Multi-Sig) Scheme?

Traditional multi-sig requires multiple complete private keys to be generated and stored separately, and then brought together to sign a transaction on the blockchain. MPC, however, never creates a single, complete private key.

Instead, it creates multiple key shares, and the signing process is a distributed computation where the shares are used to sign the transaction without ever being reconstructed. MPC eliminates the single point of failure inherent in the storage of even one full key.