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With the rapid development of drone technology, drones are frequently used in all aspects of urban safety, such as emergency disaster monitoring, public safety monitoring, traffic monitoring, violation monitoring and so on, which further speeds up the pace of smart city construction. For small and medium-sized cities, the cost of buying drone is too high, and renting drone is more cost-effective. However, the leasing transactions between government departments and drone leasing companies are faced with problems such as distrust, price disputes, and increased costs caused by third-party participation. To solve these problems, this paper proposes a multi-party secure and convenient transaction framework based on alliance blockchain, which helps to build trust between drone leasing companies and government departments without worrying about privacy leakage and transaction data tampering. In addition, an intelligent pricing strategy based on contract theory is designed, which can not only maximize the utility of government departments, but also encourage drone companies to actively participate. Simulation analysis shows that the proposed drone services transaction mechanism based on blockchain and intelligent pricing strategy is very effective. [ABSTRACT FROM AUTHOR]