Later, the app served as a user-friendly, accessible way for members of the public to store their EU digital covid certs.

Source: https://www.irishexaminer.com/news/arid-41174200.html

To get a key to the gate you have to go to the dive shop down the road, prove you have cave diving certs, prove you have dive accident insurance, and sign a waiver.

Source: https://www.fark.com/comments/12733980?utm_source=feed&utm_medium=comments&utm_campaign=fark

Transparency logs are critical because they give developers and security teams the ability to monitor that all the certs issued for a company’s domain name are correctly issued.

Source: https://www.infoworld.com/article/3696209/sigstore-roots-of-trust-for-software-artifacts.html