Why Your App's Audit Log Must Complement, Not Copy, Your Auth Provider's History

Identity providers record authentication events such as factor challenges and session data, but they cannot capture internal application decisions like device-risk scoring, recovery eligibility, or agent overrides. For SOC 2 compliance, organizations need their own append-only audit logs that document what each authentication event meant within their specific control environment. The two records should be linked using stable correlation identifiers rather than duplicating provider payloads into a second database. OWASP guidance supports collecting authentication signals but does not treat third-party event feeds as a complete record of private application logic. The practical distinction is clear: provider history confirms that an authentication event occurred, while the application audit log explains what the system decided to do about it.