The smart city is aiming for an intelligent connected society beyond the concept of U-City with simple ICT. In particular, the rapid development of information and communications, such as 5G, and blockchain, has led to a paradigm shift to a new digital urban environment. As smart energy and smart transportation are integrated or interlocked, the technical and institutional arrangement should be preceded from the time of user authentication to provide reliability, transparency, and efficiency. For this purpose, this study aims to investigate the technical and institutional plans for the implementation of safe urban life utilizing blockchain technology. In order to apply smart city services using block-chain technology, it is necessary to fully agree and practice among various stakeholders such as public, business, academia, and civic groups. It is expected to be implemented as a people-centered smart city by gradually applying the block chain-based pilot service, which is made and participated together.