NTS: Authenticated Time at Meta

Meta has launched NTS (Network Time Security) support at nts.meta.com, enabling authenticated time verification so devices can confirm time data hasn't been modified in transit. The service uses stateless NTS servers with derived rather than stored cookie keys, and Meta has open-sourced the protocol, server, and client code while encouraging mobile platforms to adopt NTS support. This addresses a critical security gap in NTP, which has remained unauthenticated since 1985 despite being fundamental to certificate validation, token expiry, and other security mechanisms that increasingly depend on precise timekeeping.