Simplicity is the glory of expression. - Walt WhitmanThis book is designed to keep in mind both technical and non-technical people. The book covers Business purpose, Technology and Investment aspect of Blockchain. Core concepts of Blockchain, Bitcoin and Ethereum are explained in layman’s term. Also for a programmer, there is no better learning then build your own solution. Keeping this in mind, a proof of concept implementation of blockchain is done using Java. The coding exercise cover the step by step implementation of key concepts like block creation, Hash (digital signature) generation of block, Proof of Work ,Mining, Wallet creation ,Transaction between 2 wallet etc