The objective of this book is to exhibit recent solutions and to discuss the opportunities that AI, Blockchain, and even their combinations can present to solve the issue of IoT security. It delves into cutting-edge technologies and methodologies, illustrating how these innovations can fortify IoT ecosystems against security threats. The discussion includes a comprehensive analysis of AI techniques such as machine learning and deep learning, which can detect and respond to security breaches in real time. Blockchain's role in ensuring data integrity, transparency, and tamper-proof transactions is also thoroughly examined. Furthermore. This book will display solutions that will help analyze complex patterns in user data and ultimately improve productivity.