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...
https://www.marketwatch.com/story/this-is-exactly-how-often-cocaine-and-feces-show-up-on-your-dollar-bills-2017-07-11
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?
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