Spotted a W3C proposal for “Verified Credentials.”
Credentials are integral to our daily lives: driver’s licenses confirm our capability to operate motor vehicles; university degrees assert our level of education; and government-issued passports attest to our citizenship when traveling between countries. This specification provides a mechanism for expressing these sorts of credentialson the Web in a way that is cryptographically secure, privacy respecting, and machine verifiable. Thesecredentials provide benefits to us when used in the physical world, but their use on the Web continues to be elusive.
Very interesting, seems like it could solve the issue of private age verification using a government ID.