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SteveMarty, there is a mechanism used by PSA to verify current ownership of a registry entry. They have six employees assigned to the massive task of keeping the registry up to date and legit. Fun job ehh?
example; I sell you a card, you register it but are warned, via email, that the card is owned by me. I also recieve an email to either remove my entry or confirm ownership. You then get a reply that my card has been removed by me and now eligible for your set.