The significance of the integration of blockchain, IoT, and AI in the fourth revolution driving the quality of life in the modern world has been recognized. The decentralized ledger and ultra-secure immutability, self-sovereign identity, and consensus mechanisms in blockchain along with AI algorithms, improve security. Moreover, interaction among users over the internet may create a huge impact using a smart contract in blockchain, and the integrated platform will likely to be revolutionary in many areas. Blockchain plays a significant role in providing a secured platform with IoT devices and AI algorithms. This book explores the concepts and techniques of blockchain, IoT, and AI. Also, the possibility of applying blockchain for providing security in various domains is discussed. This book highlights the application of integrated technologies in enhancing data models, better insights and discovery, intelligent predictions, smarter finance, smart retail, global verification, transparent governance, and innovative audit systems. This article will stimulate the minds of the IT professionals, researchers, and academicians towards fourth revolution technologies.