GrayPass checks whether the expected person remains in control before a sensitive digital action executes. It combines recent interaction continuity with an application’s identity, device, session and transaction signals, then returns a decision the application can enforce: allow, verify again, hold or deny. The service works alongside identity providers, passkeys and multi-factor authentication. Its Brainprint interaction evidence is an additional continuity signal, rather than standalone proof of identity, intent or permission. Supported workflows include account changes, sensitive exports and changes to an AI agent’s authority.