As a result, there’s no easy way to prove you’ve been vaccinated. You’d need cryptographically signed data that can’t easily be forged—a digital card that enables you to retrieve and store testing and vaccination information in a secure and verifiable way, via either an app or a QR code. Some have panned this as a way of denying Americans access to restaurants or other businesses. It’s more likely to allow Americans to visit places they otherwise can’t, such as nursing homes or hospitals that aren’t allowing family members. Another way of thinking about vaccine passports is as a fast lane. Those who present proof of a vaccine might be able to skip requirements for a temperature check, health questionnaire or negative Covid test. Some people stop at toll booths and pay; others buy an E-ZPass and zoom through. The “passport” wouldn’t impose an intrusive new layer; it would eliminate other requirements.