What you describe more or less exists here in Spain. The (mandatory) national ID is a NFC smart card with a PKI key [1]. With that (among a lot of other things)

What you describe more or less exists here in Spain. The (mandatory) national ID is a NFC smart card with a PKI key [1]. With that (among a lot of other things) I can login into my regional government website [2] and look at my (single-payer) healthcare medical history, download it, see who has requested access to it, restrict access to some parts of it, make an appointment, ask for a new doctor, etc. etc. Of course it is sadly more closed-source, proprietary, lowest-bidder work than your vision, but at least the idea is out there and available for millions of people already. [1] https://www.dnielectronico.es/PortalDNIe/PRF1_Cons02.action?pag=REF_103&id_menu=1 https://www.dnielectronico.es/PortalDNIe/PRF1_Cons02.action?... [2] http://www.san.gva.es/web/portalhse/inicio http://www.san.gva.es/web/portalhse/inicio