Survey on the Application of BlockChain to IoT

A network composed of lightweight devices such as IoT has problems due to limited resources such as lack of storage space and low computing performance. These issues pose significant challenges in the application of robust security technologies, which reduces network security performance. The blockchain with strong security is a suitable technology to solve IoT problems with weak security. As a result, various research is being carried out to increase security, lightness, and efficiency of the IoT network by applying blockchain to IoT. This paper introduces the trend of research to apply blockchain to IoT.