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Data sharing in the Internet of Vehicles (IoV), which refers to the exchange and sharing of traffic data among vehicles and between vehicles and infrastructure, can significantly improve driving experience and enhance driving safety. By virtue of decentralization, tamper-proofing, and traceability, blockchain has been widely used in IoV data sharing, providing a reliable foundation for establishing a trusted data sharing environment. However, the integration of traditional blockchain and IoV data sharing still encounters several non-negligible challenges. This paper presents a systematic overview of blockchain-based data sharing schemes in IoV and summarizes the main challenges. We then analyze and compare existing solutions for three critical issues: low transactions per second (TPS) performance, high storage overhead, and insufficient incentives. Finally, combined with the development trends of IoV and blockchain technologies, we propose potential future research directions.
Fan et al. (Wed,) studied this question.