In recent years, smart city has emerged as a new paradigm to provide high quality facilities to the citizens by dynamically optimising the city resources. Smart cities can offer finest services for boosting the daily life of citizens on healthcare, transportation, energy consumption, and education. However, the concept of smart city is still evolving and despite its potential vision, there are proliferating security challenges. Blockchain has the potential to promote the development of smart cities owing to its good properties such as auditability, transparency, immutability and decentralization. Therefore, this paper presents the state-of-the-art blockchain technology to solve the security issues of smart cities. Initially, the paper throws light on the background knowledge and then surveys the utility of blockchain in various smart communities such as healthcare, transportation, smart grid, supply chain management, financial systems and data center networks. Finally, some future research directions are identified through extensive literature survey on blockchain based smart city systems.

近年来，智慧城市已经成为一种新的范例，通过动态优化城市资源为居民提供高质量的设施。智慧城市可以提供最优质的服务，以改善居民在医疗保健，交通，能源消耗和教育方面的日常生活。但是，智慧城市的概念仍在发展，尽管具有潜在的远见，但仍存在不断增加的安全挑战。区块链由于其良好的性能，如可审计性，透明性，不变性和去中心化性，具有促进智慧城市发展的潜力。因此，本文提出了最新的区块链技术来解决智慧城市的安全问题。原来，该论文着重介绍了背景知识，然后调查了区块链在各种智能社区中的效用，例如医疗保健，交通运输，智能电网，供应链管理，金融系统和数据中心网络。最后，通过对基于区块链的智慧城市系统进行广泛的文献调查，确定了一些未来的研究方向。