A Review on the Integration of Blockchain and IoT

The Internet of things (IoT) is a rapidly growing technology that enhances people's interaction with each other and with their surroundings. It is also a key player behind the advancements in different sectors including healthcare, smart city, and logistics in addition to many other fields. In order to meet their design requirements, IoT uses various types of sensors, smart meters, RFIDs, and actuators resulting in networks of growing size and complexity. This comes at the price of raising scalability, security, authenticity, and reliability issues. Therefore, it is vital to thoroughly address the expected issues not to hurdle further evolution of IoT deployment. This is where blockchain fits. The emersion of blockchain technology promises to solve many IoT related issues. Blockchain's unique features of transparency, reliability, traceability, and security nominate it to play a pivotal role in improving IoT networks, resolving their issues, and facilitating their expansion. This paper explains the main problems facing IoT -based systems and the role of blockchains in addressing them. Additionally, it briefly surveys the current work in the literature on researches discussing the integration of IoT with blockchain.