This book is produced by Huawei’s technical team that has been deeply involved in blockchain R&D and application. From the superficial to the complex, this book introduces the origin, principle, evolutionary process and development trend of blockchain technology; shares the actually landing cases with readers; takes Huawei cloud blockchain service as an example to demonstrate the blockchain application; explores the value and future development trend of this technology; and showcases the ideas for development and innovation of blockchain from multiple perspectives. In this book, there is not only the basic knowledge of blockchain, but the exploration into blockchain application scenarios and development trends, which will help non-professionals comprehend this subject systematically. Moreover, the author also discusses the technical principles, algorithms and application practice of blockchain, in the hope of expediting the development engineers to devote themselves into the R&D work.