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The development of the IoT is rapidly growing. These IoT devices are mainly deployed to control and report environmental changes, prevent risks, and bring many beneficial services. However, these benefits may open doors to the adversaries in conjunction with security vulnerabilities and privacy issues. In the recent past, Blockchain has been an emerging technology that reaches several use-cases apart from cryptocurrency. For instance, IoT integration with Blockchain implementation yet indefinite required further research because of resource-constrained IoT devices and ledger-based Blockchain protocol design. This paper presents the systematic implementation of securing IoT devices by enabling the Ethereum Blockchain smart contract. The results show that the collected information is securely stored in the Blockchain after successful authentication. Practical Application: Blockchain innovations have the power to transform manufacturing, construction, healthcare and building supply chains by eliminating the middleman, streamlining operations, improving overall security, and simplifying data management. Onboarding, recordkeeping, client screening, data management, security, privacy, and transaction and trade processing are examples of several practice applications in the financial, insurance, and eHealth services industries. Thus, this study ensures security by enabling Ethereum blockchain and smart contracts in an authentic blockchain applications for building sustainable environments to improve readability and trustworthiness of the transactions.

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