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<p>[QUOTE=&quot;-jeffB, post: 8040275, member: 27832&quot;]Had to go and look this up:</p><p><br /></p><p><a href="https://en.bitcoinwiki.org/wiki/Casascius_physical_bitcoins" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.bitcoinwiki.org/wiki/Casascius_physical_bitcoins" rel="nofollow">https://en.bitcoinwiki.org/wiki/Casascius_physical_bitcoins</a></p><p><br /></p><p>From the description there:</p><p><br /></p><p>The possibility of a $1.5 million payoff shifts the definition of &quot;difficult&quot; considerably. I can think of lab tools that might be up to the task. (A very tiny spot-XRF setup that can discern presence or absence of toner under the sticker...?)</p><p><br /></p><p>Edit: ...but then it&#039;s possible to <i>tell</i> whether the code has been redeemed even if you don&#039;t have the code itself, right? If I understood correctly, there&#039;s an index of these things that can be used to determine whether a particular one has been redeemed?[/QUOTE]</p><p><br /></p>

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