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<p>[QUOTE=&quot;quarter-back, post: 1805650, member: 47022&quot;]Don&#039;t know if its possible, but how about two passive RFID chips, each of which has different types of info.&nbsp; The ID of the coin itself could be readable with a smartphone app from the TPG, but only if an encryption code on the second chip is correct.&nbsp; Using passive chips provides a pretty long life-span, and may make it possible to add another layer of security if only the correct app would activate them.&nbsp; Its probably easier to upgrade software than to keep trying to come up with new hardware (slab designs).&nbsp; </p><p><br /></p><p>The downside of course is that twenty years from now we&#039;ll find out that having a RFID chip near a coin causes little green spots to develop[/QUOTE]</p><p><br /></p>

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