Many of our ordinary things will soon be linked, due to contemporary Internet of Things (IoT) technology. These items will be able to connect and interact with one other as well as their surroundings, automating much of our job. Security, seamless authentication, resilience, and simplicity of maintenance are essential for IoT node communication. Blockchain appears as a possible option to provide these vital features. Blockchain’s decentralised nature has enabled it to address several IoT security, maintenance, and authentication issues. As a consequence, the number of blockchain-based Internet of Things applications has increased dramatically in recent years. This study presents a blockchain-based industrial IOT method using RSA encryption. RSA encryption results in fast encryption.