What is UUID v1?
UUID v1 combines a 60-bit timestamp (100-nanosecond intervals since 15 October 1582), a clock sequence, and a node identifier historically derived from the machine's MAC address. In browsers, a random node identifier is used instead, avoiding hardware fingerprinting.
Should I still use v1?
Only when integrating with legacy systems that expect v1. Its timestamp bytes are stored in an order that does not sort naturally, and embedding node identity raised privacy concerns. For new time-ordered IDs, UUID v7 is the modern replacement.
Need a different version? Try the full UUID generator supporting v1, v3, v4, v5 and v7.