Abstract
The interest in blockchain technology has grown over the years as a result of its prospect to transform business processes. The number of companies rushing to explore blockchain applications has grown rapidly due to its inherent robustness to cyberattack. This book chapter explores the use of blockchain technology in the Internet of Things (IoT) and the relationship between blockchain and cybersecurity technologies in the IoT ecosystem. We give an insight to security and privacy using blockchain and the substantial positive changes this technology will bring alongside its challenges.