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The current IoT system has a security risk since all data is kept in a single location and all computing activities are done through a central server. It is possible for data tampering and a single point of failure in a centralized IoT system. When the primary server fails, the centralized IoT paradigm creates a single point of failure because a centralized system manages all IoT data from several linked devices. It is a clear target for privacy and security concerns. To overcome these problems, the Ethereum Blockchain Technology is considered in this chapter for securing the data through distributed and decentralized ways. The pre-processing for Ethereum node creation from a genesis block, smart contract deployment, and performance metrics are presented