I would like to apologize to the readers of this site for the long hiatus. I have been spending time as cardiologist, consultant, and caregiver for a seriously ill family member. My goal is to continue writing as it is something I truly love to do. I hope and believe that all of the above roles I engage in add to the quality of this blog.A good definition of blockchain is: A blockchain,123 originally block chain,45 is a continuously growing list of records, called blocks, which are linked and secured using cryptography.16 Each block typically contains a cryptographic hash of the previous block,6 a timestamp and transaction data.7 By design, a blockchain is inherently resistant to modification of the data. It is an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way.8

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