The EU age verification app is presented as “completely anonymous”. But the risk is that member states (the countries are supposed to create their own versions of the open-source EU app) use it to introduce identity verification that makes it impossible to post anonymously on social media. The idea behind “completely anonymous” is to use Zero-Knowledge Proof (ZKP) cryptography to break the link between the age credential issuer (EU governments) and the regulated services/sites. Currently, the EU app does not have ZKP functionality, contrasting Ursula von der Leyen’s claim that the app ”is technically ready to be used”. But more importantly, the app is designed to always function without ZKP technology; if ZKP is unavailable, the app falls back to a non-ZKP model. Even if fully developed ZKP technology could be implemented in the future, it would remain an optional extra feature that countries may choose to disable and that the EU could remove at any time. This means that the EU could decide at any time that ZKP may no longer be used, and in one stroke the app would fall back to its default mode, meaning that every post on social media carries an ID tag. By that point, an infrastructure will already have been rolled out; people will have gotten used to it, and it will be harder to roll it back. More details on https://t.co/wTVKHMS1zg