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This seems like a worse approach to me than a cookie. My IP and UA don’t change, pretty much ever. I can delete a cookie anytime I want.

• alkonaut 2y ago
  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.