A Blockchain‐Empowered Trust Management System for Collaborative Services in Sustainable Smart Cities

ABSTRACT The Internet of Things (IoT) can offer more precise, intelligent, and low‐ or non‐human involvement approaches to various sectors. One of the significant uses of the IoT is in smart cities, which includes a variety of services, including smart home, garbage disposal, and smart grid. Many different collaborative IoT integrations are available in smart cities because of these diverse services. A digitized smart city was created to offer complete government cooperation solutions based on digitization and automation to improve residents' quality of life. Information safety and privacy concerns arise when various services need to work together seamlessly. Trustworthy data is vital to the federal government and its constituents, and data accuracy and privacy must be ensured. In this work, we presented a smart contract‐enabled smart city and software‐defined networking (SDN) in limited contexts during collaborative activities based on a controlled network and decentralization. The proposed collaborative application safety structure is being tested on the Hyperledger blockchain networks. We describe a unique approach to data security through collaborative work in intelligent city governmental design, utilizing Proof‐of‐Trust Collaboration (PoTC) in Hyperledger blockchains. A security approach based on SDN and smart contracts is employed to safely manage and monitor all connections and transactions across diverse IoT networks. To assess the viability of the proposed decentralized security framework, we created a supported scenario for collaborative activities in an SDN‐enabled IoT design. We have conducted various experimental simulations to test the proposed blockchain‐integrated SDN‐based IoT architecture for a smart city, including throughput, access delay, and trust evaluation. The simulation results show that the proposed SDN‐enabled blockchain networks provide better results than existing works.