The system behind the vaccine passport is a database platform which can be expanded and scaled to include any number of health-related data: BMI, blood pressure, medications, genetics, etc. These additional data can then be used to (apparently magically, non-transparently and without possibility of appeal – the algorithm is always right!) determine your health status as a binary good/bad, green/red status. This status then is used as your eligibility to access or experience any number of things. In other words, you may have access to go to the store, but a red (no-go) token to travel, etc. Only the system can fully ‘know’ the process used to produce the certificate/token. We simply must ‘trust the system.’