UUID Monotonic Order Checker

RFC 9562 §6.2 requires that UUID v7 implementations guarantee monotonically increasing values within the same node and clock sequence. In practice this means: if two UUIDs are generated in the same millisecond, the second must be lexicographically greater than the first — typically by incrementing the 12-bit rand_a field as a sequence counter.

Failures happen in distributed systems when multiple generators run without coordination, when a process receives IDs out of network order, or when a clock steps backwards. The result: IDs that look time-ordered but are not, breaking sort assumptions in databases and event streams.

This tool checks a batch of UUID v7 strings for strict ascending order. Paste them one per line — up to 1,000 at a time. A green badge confirms monotonic order; a red badge flags the exact position of the first violation and shows both the out-of-order UUID and its predecessor so you can diagnose the source.