Nowadays, there is a platform where embedded devices connected to the internet for collecting data and exchange with each other which is called as Internet of Things (IoT). Therefore, one of the technical challenge of having billions of devices deployed worldwide is the ability to manage them. In order to make the data secure and trustworthy, Blockchain technology will be used as a platform for all transaction in real time that is implemented to the IoT sensor devices. Blockchain is a solution that helps to keep track of changes made on the IoT data during transmission. It can prevent unauthorized data manipulation in the system. The data security using Smart Contracts in Blockchain would ensure a reliable and efficient management of the data collected and IoT devices, respectively. The proposed system also enables end-user interaction for easy retrieval and analysis of real-time and historical data. The result is expected to show that Blockchain technology could be used as a platform that provides security and integrity for data transaction in such IoT devices.

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