That sounds, in theory, like a pretty cool use for ZKP. However, I'm skeptical how you fulfil the other requirements that vaccine QR codes generally have withou

That sounds, in theory, like a pretty cool use for ZKP. However, I'm skeptical how you fulfil the other requirements that vaccine QR codes generally have without also providing a workaround for tracking. For instance, most vaccine QR codes are not considered valid by themselves, as I could simply share my QR code with my friend. So I need to present valid photo ID alongside the QR code.