Bitcoin exploits a weakness in programmer brains 
. I am still skeptical that there is a product here. https://hackernoon.com/ten-years-in-nobody-has-come-up-with-a-use-case-for-blockchain-ee98c180100 …
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The only widely deployed application of a similar concept I've seen has been Google's Macaroons for authentication & access delegation. Nested HMACs is kinda like a small blockchain. But it's all so much more complicated than regular systems; not sure I'd use it.
