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The checksum thing is only used to block cards. If the billing company that is going to do the billing for this has ways of blocking cards then that is what can be used. People shouldn't be able to sign up more than once with one creditcard.
I'm sure I can come up with a system to check people. A site could store events of cheating, with a reason. Other link-sites should be able to either review those and blacklist the submitters as well or automatically blacklist submitters that are blacklisted by others. Also depending on the reason they're blacklisted. I might blacklist someone for adding a picturebanner, but someone else might not care about that. He could then automatically blacklist people I add to the list for adding consoles, but not the once I blacklist for adding picturebanners for instance...
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