This book focuses on the integration of blockchain technology for IoT systems, exploring the methodologies behind each component of the system to bolster the data security and protect privacy. It also discusses the essential algorithms necessary for the efficient implementation of blockchain in IoT systems to provide security and privacy. With the advancement of Internet of Things (IoT), ensuring data security and privacy has become a critical concern due to the significant economic value associated with IoT data. This book presents algorithms that encompass the processes, starting with the generation of a block containing IoT data to the finalization of the consensus. These algorithms provide realistic methods for effectively integrating blockchain into IoT systems. The primary objective is to thoroughly examine the process of integrating decentralization paradigm into a conventional centralized system to address persistent problems. This book is appropriate for advanced-level students in computer science and electrical engineering, who are studying relevant subjects such as the Internet of Things, blockchain, wireless communications and artificial intelligence. Researchers and professionals working in blockchain-based IoT or equivalent fields will want to purchase this book as well.