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The Internet of Things (IoT) means the internet-connected devices or objects which are capable of exchanging data and instructions over a wireless network of the internet. There is a wide range of applications of IoT technology to make lives easier in every field. Security, privacy, and scalability have always been the most notable challenges which have to be solved to accelerate the large-scale adoption of IoT devices.Blockchain makes the troubleshooting process easier for the IoT devices like the smart contract features of the blockchain technology. The immutability feature is the key to prevent malicious users to modify and eliminates the stored data.