The proper management of trust in multi-agent settings is a vital component of guaranteeing the security and dependability of systems, particularly in the context of the Internet of Things (IoT) for smart cities. This is especially true in light of the fact that smart cities are becoming more interconnected. In order to overcome the issues that are brought about by the heterogeneous and linked nature of IoT devices inside smart cities, this article makes a proposal for a trust management mechanism that is based on the model of Blockchain. The trust management system that is based on blockchain technology provides a method that is safe and decentralized, as well as increased transparency and responsibility for transactions that are connected to trust. The suggested approach makes it easier for agents participating in the Internet of Things ecosystem to engage in trustworthy interactions by drawing on the immutability and consensus processes that are built into Blockchain technology. This study illustrates the usefulness of the suggested strategy in assuring the secure authorization of smart city resources via actual implementation, which is shown throughout the paper. In addition, a hybrid application that is both user-friendly and able to provide seamless interactions and control over smart city equipment is built. This further enhances the entire user experience.

Internet of Things, Blockchain, smart city, Trust Execution , Smart contracts, Decentralized.