Theoretically, if you did trust your government, couldn't zero-knowledge proofs be used to allow such a system? I am a dunce about this stuff, so genuinely asking.
Example that seems like it should be required for all age verification systems, if linkability is addressed:
> Theoretically, if you did trust your government,
Trust not to misuse my data intentionally?
Trust to not lose my data due to incompetence?
Trust to not subcontract this service to some spying company like Google?
> couldn't zero-knowledge proofs be used to allow such a system?
They could, but will they really be zero knowledge or there will be some intermediary leftovers that aren't zero knowledge? See trust in competence above.
Trust not to misuse my data intentionally?
Trust to not lose my data due to incompetence?
Trust to not subcontract this service to some spying company like Google?
> couldn't zero-knowledge proofs be used to allow such a system?
They could, but will they really be zero knowledge or there will be some intermediary leftovers that aren't zero knowledge? See trust in competence above.