PPHR: Blockchain-based Privacy Protection House Rental System

In recent years, the sharing economy is developing rapidly and has become a popular economic model. For example, sharing platforms such as Airbnb have gradually entered people ’s field of vision and obtained high economic benefits. However, the information managed by such a centralized platform may be used by criminals and people’s privacy may be violated. In order to achieve the goal of decentralization, we propose a blockchain-based house sharing platform. Users can directly conduct transactions on the blockchain by running smart contracts. Our scheme guarantees the anonymity of users through commitment scheme and zero-knowledge technology. In order to deal with the problems that may be encountered in reality, we propose a trusted authority to trace malicious users. In addition, our platform has reputation mechanism to restrict the behavior of users. We analyze its security and performance, and the result shows that it is feasible in reality.