The system operates on the OIDC protocol through a bank delegation model, meaning verification is confirmed directly by the user's bank rather than through a scanned or uploaded identity document. During a successful check, Czech Bank iD returns a person's given name, family name, middle name, full name, date of birth, nationality, sex, phone number and address. Where available, it can also supply document-related data, including document type, number, issue and expiration dates, and issuing country and authority.