A standard for face-to-face TOFU checking would be in addition to the PKI infrastructure, and to facilitate a secure way to use self-signed certs. Obviously we

A standard for face-to-face TOFU checking would be in addition to the PKI infrastructure, and to facilitate a secure way to use self-signed certs. Obviously we've never had face-to-face relationships with the likes of Paypal, Stripe, etc, and would still rely on our browser and operating system vendors to validate the chain of authority.