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<p>[QUOTE=&quot;doug444, post: 1924303, member: 38849&quot;]<font size="6">quarter-back</font>, your idea is similar to mine (posted yesterday in another thread) which involves a hidden slab number, and confirmation of location, etc.&nbsp; I didn&#039;t actually use the term RFID.&nbsp;&nbsp; <u>My idea was for slab security, not coin authentication</u>:</p><p><br /></p><p>&quot;...This is precisely why I floated the idea of a slab reader as a smartphone app. In a new variation, the TPG could associate an embedded second number with each slab, not printed on the slab. Here is the sequence:</p><p><br /></p><p>1. You (the Buyer) and the Seller are in Minneapolis, dealing face-to-face.</p><p><br /></p><p>2. The Buyer uses his app to read the Seller’s slab.</p><p><br /></p><p>3. The Buyer punches in his app’s account number and password (yes, Chinese hackers may have</p><p>stolen the account number and password, but it doesn’t matter).</p><p><br /></p><p>4. The TPG software then displays an automated 1-time-use toll-free number.</p><p><br /></p><p>5. The Buyer calls this number and enters the second slab number plus his GPS.</p><p><br /></p><p>6. The TPG system then confirms the second slab number, against the coin’s description AND the visible number on the slab. But it sends that confirmation ONLY to a phone located at the GPS just entered seconds before (which the Chinese will not know). No confirmation = the slab is a fake.</p><p><br /></p><p>7. The TPG’s 1-time use toll-free number will never work again. To re-submit, even 2 minutes later, you start over.</p><p><br /></p><p>Note this system does not confirm the COIN is genuine. I am not a programmer or security specialist, so if I have left out a critical step, or written ambiguous instructions, post that fact in this thread. The app may be free, but the Buyer may be charged each time he uses the service package provided by the TPG...&quot;</p><p><br /></p><p><b>You are welcome to improve upon my proposal and post the results:</b>[/QUOTE]</p><p><br /></p>

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