A block chain is a distributed, public ledger, recording transaction and tracking assets, and of which immutability is guaranteed by a peer-to-peer network of computers, not by any centralized authority. Assets can be tangible, such as homes or cash, or they can be intangible, such as patents or copyrights. A block chain consists of ordered records arranged in a block structure. Each data block contains a hash (digital fingerprint or unique identifier), time stamped batches of recent transactions and a hash of the previous block. With this design, each block is connected in chronological...