Not a first time Chess.com has an alleged leak, this one seems to be like the ones before but on a larger scale

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The dump had a uuid column and a member_since column. UUIDv1 isn't random, it embeds a 60-bit timestamp, so if the data is genuine the two should agree. They did, 100.00% across 200k rows: python import uuid, datetime u = uuid.UUID("0bcc8686-c684-11e7-805e-000000000000") print(datetime.datetime.utcfromtimestamp((u.time - 0x01b21dd213814000) / 1e7)) # 2017-11-11 02:00:09