cookies - How can I prove IP rotation is being used to cheat in public voting? -

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i running anonymous voting contest. using cookies sole deterrant of multiple voting, tracking ip addresses , looking suspiciously high numbers of votes same ip. is there way prove cheating ip rotation?

only statistically, not 100% proof can put statistical terms in contest terms - example (just example, don't know traffic exactly) - no more 1 vote per hour same class b network same candidate

a way filter out based on cookies require cookie before contest starts. i.e. allow previous visitors of site vote. place cookie on computers before know contest. well, , of course require registration votes, that's little more involved.


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