Vaccine diary, second-dose, and health status alert, and informational features of our proposed app would be independent of existing systems. The input of vaccination information upon administration of a vaccine and side effect/efficacy reports are two areas with potential for integration with government systems. To verify and record vaccine administration, vaccination clinics or governments would need to provide signed QR codes that can be printed/copied by pharmacies or by users. This QR code would have information regarding the lot, manufacturer, and dosing of a vaccine which can then be verified by others with the appropriate digital key.