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<p>[QUOTE=&quot;ctrl, post: 351803, member: 13378&quot;]You could establish a &quot;private key&quot;-type system. Future coins sent in for authentication are provided a private registration number that is separate from the certification code on the slab itself. Current slabs could be sent in and, after re-authentication, sent back with a private registration code. </p><p><br /></p><p>Before selling a coin, the owner and holder of a private registration number validates the certification using the certification number and the private registration number at the TPG site, receiving in return a short-lived temporary &quot;certification validated&quot; code that any potential buyer could view the details on by calling or checking online. It would not be necessary to take names and locations, although extra information would be optional and helpful (such as location). </p><p><br /></p><p>On buying such a coin, the buyer would then receive the private registration number from the seller and could then petition the TPG as a new owner for a new private registration code, deactivating the previous one.</p><p><br /></p><p>One weak spot would be in the passing of the private registration number (making sure it&#039;s the right one - could be done immediately before the sell, and if the buyer backed out the seller could simply immediately request a new one), not to mention all the extra work involved by everyone...but it would certainly add a layer of verification to an individual coin.[/QUOTE]</p><p><br /></p>

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