How to define looked the user is or not?

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There is a button, clicking on which redirects to advertising, then, after the ad redirects to another page and there the user's balance is replenished. How to track whether a user has viewed an ad or not? Thanks in advance
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You can check the Referer header, but it can be faked.
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Go to the page of advertising, and after 20 seconds, send, page, advertising, ajax request with the confirmation view.
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Write a script asking for a "Like advertising?", and below Yes / No
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