关键词: 区块链, 智能合约, 共享汽车, 信誉评估算法, 数据安全

Abstract: With the coming of the sharing era，the shared vehicle industry has shown great potential，but the traditional shared vehicle rental platform is facing the problems of data security and asynchronous data fragmentation caused by centralized storage. In order to solve these problems，blockchain technology with distributed storage，network wide consensus and tamper proof features was applied to design a shared vehicle data sharing and settlement system. Firstly，the underlying design and key implementation of the system were introduced，and innovative smart contracts in the blockchain were used to solve the complex logical decision-making problems of key businesses in the shared vehicle platform，including its registration，transaction upload and behavior monitoring process. And then，a reputation evaluation algorithm was proposed for malicious nodes in the system. Finally，the system test results show that the proposed system meets the actual requirements in terms of request latency and throughput performance，and can effectively inhibit the malicious behavior of a single node.

Key words: blockchain, smart contract, shared vehicle, reputation evaluation algorithm, data security