Big Tech is in the process of developing the architecture for digital passports:

https://www.wsj.com/articles/big-tec...hare_permalink

"A coalition that includes tech giants and healthcare providers is preparing to release global standards for mobile apps that verify whether someone has had a Covid-19 vaccine.

The Vaccination Credential Initiative standards will incorporate digitally-verified clinical data with a name and birth date that can be also displayed as machine-readable QR codes.

After the open-source standards are released next month, they can be integrated into mobile apps that people could use to verify they have been vaccinated to gain admission to offices, restaurants, bars, entertainment venues and other public places."