Google has included zero-knowledge proof (ZKP) technology into its digital ID system, marking a major shift in how user data is protected during identity verification. The ZKP-enhanced digital ID system launches first in the United Kingdom. UK users now link digital IDs derived from their passports for identity verification across participating platforms. The technology enables age verification without revealing full identity details. This is performed through custom-built ZK systems developed using technology from Ligero, a startup focused on privacy platforms. As the mandatory REAL ID usage deadline nears, Google has confirmed plans to support digital passport-based credentials for domestic flights. These credentials will be accepted at select authorized airports, allowing travelers to use their mobile devices for identity checks. While it remains unclear how Google’s ZK system will interact with cryptocurrency applications, the company stated that its implementation will be open-sourced for other wallets and online services.