Cities worldwide continue to expand, prompting governments and businesses to adopt technologies that improve efficiency, sustainability, and quality of life. Smart city initiatives already rely on the Internet of Things (IoT), artificial intelligence, and big data to manage urban systems. The blockchain strengthens these systems by introducing secure, transparent, and decentralized infrastructure. Across the Asia-Pacific (APAC), rapid urbanization and strong public investment continue to accelerate smart city development. Governments and institutions increasingly explore blockchain as a foundational technology to support secure data exchange, efficient services, and digital trust. Enabling transparent and efficient governance Governments aim to deliver services quickly, clearly, and consistently. The blockchain supports this goal by recording transactions in tamper-resistant ledgers that anyone with the necessary permissions can verify. Smart contracts automate administrative processes such as permit approvals, tax collection, and procurement. These systems execute instantly upon meeting conditions, improving efficiency and reducing delays. Research also highlights blockchain’s efficiency in civic participation. One study found that as little as 0.12 percent of a population is necessary to represent the whole population’s behavior, demonstrating how efficiently cities can manage participatory governance. In South Korea, cities continue to implement blockchain-based public services, including voting and document verification systems. These initiatives strengthen accountability and encourage citizen engagement. Enhancing data security and privacy Smart cities generate massive volumes of data through connected devices such as sensors, cameras, and smart meters. City leaders actively prioritize securing this information while maintaining accessibility. The blockchain distributes data across decentralized networks, ensuring each transaction remains encrypted and permanently recorded. It stays secure by assigning each block a 256-bit cryptographic hash, which produces a unique 64-character alphanumeric string that links directly to the previous block. This structure ensures even the smallest data change results in a completely new hash, thereby strengthening the integrity of the entire system.