[BrunoVT1992]

GUID / UUID v7 relies on a Unix Epoch timestamp in milliseconds to provide time-ordered identifiers. However, system time is not always reliable. Clock rollback occurs when the system clock moves backwards, which can break the monotonicity guarantees that v7 is designed to provide. RFC 9562 provides specific guidance on how implementations should handle this scenario.

Clock rollback is a real-world concern for any timestamp-based identifier system. Without proper handling, your v7 generator may produce IDs that sort before previously generated IDs, breaking ordering guarantees and potentially causing issues in distributed systems.