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Ride-sharing is a service that enables drivers to share trips with riders, which leads to several benefits such as sharing the travel cost and reducing traffic congestion. However, most of the existing ride-sharing systems rely on a central trusted unit to organize the service, which makes them subject to a single point of failure and attack, and lack of transparency. A few works have investigated decentralized ride-sharing systems, but they either do not consider privacy preservation or suffer from a tradeoff between privacy protection and accuracy due to using location cloaking technique. This paper proposes a Blockchain-based ride sharing organization system with accurate matching and privacy preservation. To achieve the accurate matching, instead of representing the ride-sharing area by a single grid, it is represented by several overlapping grids so that only near drivers/riders share rides. To preserve privacy …