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How to remember anonymous voting

What is the best way to implement “memory” or perseverance for anonymous voting? The other day I was browsing some website (unfortunately, I forgot the URL), and I could quickly “pick up” or “preview” the element. Therefore, I voted on several points. Then I closed all instances of my browser, deleted all history and browser files. I returned to the site to vote for some of the same items, but he “knew” that I had already voted. So I wonder what is the best way to achieve this.

I read about evercookies, but for some reason they don't seem like a nice way to treat your users. I do not want to go that way. Or, as always, the only way to achieve this?

If evercookies were not a mechanism for this, then the only way I can think of is to remember the IP + User Agent + client something else. But what is "something else"?

Any thoughts?

Regards, Archil

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Sites may use the following combination to try to identify a flood or abuse of a form, such as an online survey. No method is absolutely infallible; in fact, most of them are trivial for a fool.

Identification of the same person:

  • Setting a cookie (e.g. session cookie)
  • IP address comparison
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