Summary: WHO has published a "guiding document" for countries and implementing partners on the introduction of digital vaccine certificates, dubbed DDCC:VS.
Overview of the document
This is a guidance document for countries and implementing partners on the technical requirements for developing digital information systems for issuing standards-based interoperable digital certificates for COVID-19 vaccination status, and considerations for implementation of such systems, for the purposes of continuity of care, and proof of vaccination.
The work was funded by the Bill & Melinda Gate's Foundation and the Rockefeller Foundation, among others.
www.who.int
Overview of the document
This is a guidance document for countries and implementing partners on the technical requirements for developing digital information systems for issuing standards-based interoperable digital certificates for COVID-19 vaccination status, and considerations for implementation of such systems, for the purposes of continuity of care, and proof of vaccination.
The work was funded by the Bill & Melinda Gate's Foundation and the Rockefeller Foundation, among others.

Digital documentation of COVID-19 certificates: vaccination status: technical specifications and implementation guidance, 27 August 2021
The purpose of this guidance is to support WHO member states in their adoption of universally-readable digital documentation for COVID-19 vaccination status.