3 ms·

They salt the values and compute id = hash(daily_salt + IP + UA). Then they remove those every 24 hours. I think it sounds like a perfectly reasonable solution.

• AznHisoka 2y ago
  If they remove those every 24 hours, then doesn’t that mean if I made two visits, separated by more than 24 hrs, it would count as 2 unique visits rather than 1?
  • ksec 2y ago
    Yes. I am still not aware how to track returning visitors if while still staying within some privacy framework. Unfortunately on HN the default answer is to say not to track at all.
    • account42 2y ago
      You mean fortunately? Because that's the only correct answer.