[1]https://twitter.com/AlexKoppelman/status/1081586148575797250?s=19
   [2]https://books.google.com/books/about/Blockchain_for_Babies.html
   Re
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References

   1. https://twitter.com/AlexKoppelman/status/1081586148575797250?s=19
   2. https://books.google.com/books/about/Blockchain_for_Babies.html