How Distributed Key Signing Works

Say a device gets lost, stolen, or compromised. With a single stored key, that's the whole story — whoever has the device has the key. Distributed key signing, commonly implemented via Multi-Party Computation (MPC), changes that math: signing authority is spread across separate devices from the start, so no single one ever holds the complete key.

Distributed Keys

• Independent Share Generation: each device generates its own share from the start; no single device ever holds a complete key.
• Distributed Signing Authority: no single device holds the complete signing authority.
• Multi-point Validation: authorization requires agreement across shares.

Single Keys

• Single String Generation: one complete key is created in one place.
• Local Hardware Exposure: the whole key lives on a single device.
• Single Point of Failure: losing or exposing that device exposes the key.

This is the real difference between distributed key architecture and a single stored key: authorization needs multiple shares to agree, not one file sitting in one place.

This is one of the technical comparisons in the Self-Custody Hub.