Blockchain (BC), the Bitcoin crypto-currency system technology – is starting to be introduced with the Internet of Things ecosystem as a means to ensure enhanced security and privacy. In this field both academics and industry are currently focused on fervent research. In order to ensure BC's security through keeping the digital transaction leader incorruptible, the Proof of Work (PoW) encoder puzzle plays a key role. BC also uses an evolving public key to record the identity of the user and offers further confidentiality. It was not only implemented in cryptocurrency, but also in: distributed stock systems, location proof and multi-layered non-monetary healthcare systems. In order to evaluate the implementation and associated challenges of BC IOT security, BC solutions have provided enhanced protection to the IoTecosystem and investigated recent research documents and projects/applications. The quick Internet of Things (IoT) provides users with great convenience in various areas, such as clever homes, intelligent transportation, etc. However, safety risks can also be identified. Three layers of IoT (Collection layer, network layer, application layer) and three layer security problems are presented in the article. This paper. Second, for various ioT devices throughout the entire life cycle, we offer a high level blockchain security management System. Finally, the focus is on open research and future work.

Blockchain, Proof-of-Work (PoW), Internet of Things (IoT)Security