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<p>[QUOTE=&quot;doug444, post: 1922200, member: 38849&quot;]OK, let&#039;s go back to the Tampa-Minneapolis scenario.&nbsp; Here is a partial solution to privacy.&nbsp; The prospective Buyer pings the slab number, and the reply takes the form of a distance, i.e., the slab is now 1,350 miles from its original delivery point.&nbsp; This is a great circle that includes, for instance:&nbsp; Portland, Maine; Montreal; Minneapolis; Roswell, New Mexico; a number of Caribbean Islands, and the west coast of Mexico.&nbsp; <u>You can therefore get a false negative, but not a false positive.</u>&nbsp; If the Seller is currently on that 1,350-mile line (which implies he&#039;s the original TPG client), the Buyer feels reasonably sure the slab is genuine.&nbsp; If the Seller falls far away from that line, say he&#039;s at a coin show in Seattle, Washington, then nobody knows whether the slab is &quot;real,&quot; and nobody&#039;s worse off.</p><p><br /></p><p>Another possibility is for (face-to-face) transactions, or eBay transactions, is for the Buyer to ping the slab number along with a personal ID code, and let the system tell you how far apart they are.&nbsp; Less than 100 feet = genuine slab.&nbsp; The Seller, of course, would not know the Buyer&#039;s personal ID number, and therefore unable to game the system.&nbsp; If the Buyer handles a lot of slabs, then it&#039;s worth subscribing to the service.</p><p><br /></p><p>Whether all this is worth the effort, I&#039;ll leave to other folks.&nbsp; There is probably a foolproof high-tech way to do this, as long as part of the dynamics is a moving target.[/QUOTE]</p><p><br /></p>

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