UUIDv7 doesn't have the properties you think it does
Summary
The article argues that UUIDv7's commonly cited properties (monotonic ordering, embedded timestamps, and unguessability) are not strictly guaranteed by RFC 9562 implementations. It explains how timestamps may not reflect creation time, monotonicity is not guaranteed across implementations, and embedding timestamps can leak metadata, with practical guidance on evaluating UUIDv7 implementations and their guarantees.