The event timestamps embedded in the UUID can be correlated with external event streams, or even with other events within the same dataset, to de-anonymize the

The event timestamps embedded in the UUID can be correlated with external event streams, or even with other events within the same dataset, to de-anonymize the context of the event associated with the UUID. This is a common class of de-anonymization attack. Anything that allows temporal correlations to be inferred potentially leaks quite a lot of info about the data underlying the unique ids.