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    <p>for all my wanking on about crypto and smart-contracts I tend to
      forget the paper currency *already* carries some of it's history
      with it...  rapid/portable/cheap DNA analysis and chemography or
      spectroradiometry might provide analog private key
      signatures...    <br>
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      <p><a class="moz-txt-link-freetext" href="https://www.marketwatch.com/story/this-is-exactly-how-often-cocaine-and-feces-show-up-on-your-dollar-bills-2017-07-11">https://www.marketwatch.com/story/this-is-exactly-how-often-cocaine-and-feces-show-up-on-your-dollar-bills-2017-07-11</a></p>
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    <p>if a$$holes should be worried about harrassing food-service
      workers before they get their meals, it seems like they shouldn't
      really want to bully people out of cash payments either?<br>
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