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It's not uniformly distributed per definition, but the first half of a guid is the time part, and it's stored in reverse order of significance, so for this purpose it could probably be considered as uniformly distributed.
Wrong is evil and must be defeated. - Jeff Ello
For clarification on that the value is actually based on the UUID from java. And that UUID would seem to have a uniform distribution because the layout is not strictly ordered by time - the UUID uses the minor time (probably seconds/millis) as the most significant part.