Multi-Party Computation (MPC)

What Is an MPC Wallet?

An MPC wallet uses multi-party computation so several key shares cooperate to create one valid signature. No participant needs to reveal its share or reconstruct the full private key, reducing the risk that one stolen device or credential can authorize a transaction.

Eliminating the Single Point of Failure

In standard cryptocurrency wallets, a single 12 or 24 word recovery phrase controls access. If that phrase is lost, stolen, or photographed, the entire balance is compromised.

MPC replaces this single key model using Threshold Signature Schemes (TSS):

1. Secret Key Sharding: During wallet creation, the private key is mathematically divided into independent encrypted shares (for example, Share A on your mobile device, Share B on your personal laptop, and Share C on an institutional cloud server).
2. Distributed Signing: When authorizing a transfer, a predefined threshold (such as 2 out of 3 shares) computes a valid cryptographic signature cooperatively.
3. Zero Key Exposure: The complete private key never exists in plaintext memory on any device at any point in time.

MPC vs Traditional MultiSig

1. MultiSig (Onchain): Requires multiple public keys or accounts to approve a transaction through blockchain script or a smart contract. The threshold policy is normally visible onchain.
2. MPC (Offchain Cryptography): Produces a standard blockchain signature through an offchain protocol between key shares. Chain support still depends on the wallet implementation and the signature scheme used by that network.

Primary Use Cases

1. Institutional Custody: Hedge funds and corporate treasuries use MPC to enforce multi employee transaction authorization without sharing master seed phrases.
2. Seedless Retail Wallets: Consumer applications use MPC to offer email or biometric based wallet logins with seamless social recovery.

Learn how to secure digital assets in the Complete Cold Storage Guide, or build the fundamentals in order through Academy School.