In this book, I have design and implementation of data security environment on cloud computing for Healthcare sector. In general data security is a challenging issue in today¿s environment when data travel from one terminal to another. In this book majorly two domains is used. One is the Cloud Computing. Cloud computing has developed as one of the newest terms for developing technology, and cloud computing has become one of the most significant problems facing main stream media. Numerous libraries on cloud computing have existed in recent years. Cloud computing's concept and practice is focused on cloud storage.Another one is Blockchain. A block chain is the technology which enables all participants to maintain a ledger that contains all operational data and renew their records in order to preserve consistency when a fresh customer occurs. Since the development of the Internet and authentication software has enabled all participants to check a transaction's accuracy. In block chain I focus on broker-free (P2P-based) features, which eliminating excessive charges through p2p operations without third party approval.