This is getting totally out of hand...
NEW - WHO has published a "guidance document" for countries and implementing partners on the introduction of digital vaccine certificates, dubbed DDCC:VS. The work was funded by the Bill & Melinda Gate's Foundation and the Rockefeller Foundation, among others. - WHO: Digital documentation of #COVID19 certificates: vaccination status: technical specifications and implementation guidance.
Sauce? I found this https://www.who.int/publications-detail-redirect/WHO-2019-nCoV-Digital_certificates-vaccination-data_dictionary-2021.1
Imagine this or this happens later on.