基于区块链的位置证明关键技术

地理位置的真实可验证性是构建可信位置服务生态的基本前提，基于区块链的位置证明技术是位置服务领域的发展方向。本项目针对目前中心化架构的位置服务系统存在易出现单点失效、位置篡改、网络协同攻击等问题，在不增加定位硬件、不改变用户习惯的条件下，通过区块链去中心化技术，研究去中心信任的、隐私保护的、高度准确的、审查抵制的、用户透明的地理位置证明方法。重点研究构建基于区块链的去中心化位置服务威胁模型、支持多定位模式的位置证明方法、空间位置数据区块链高效存储与查询方法、基于私密计算模型的位置证明隐私保护技术，突破抗合谋攻击的空间位置证明算法、空间位置大数据高效时空索引等关键技术，研制基于区块链的位置证明原型系统，并开展关键技术方法验证和应用验证，为可信位置服务体系发展提供有力的技术支撑。

The real verifiability of the geographic location is the basic premise for building the ecosystem of trusted location service, and the proof of location technology based on blockchain is the development direction in the field of location services. The purpose of this project is to research the trustless, privacy-protected, highly accurate, censorship-resistant, and user-transparent location verification methods, through blockchain decentralization technology. Without adding positioning hardware and changing user habits, the proposal plans to address the problems in the current centralized location service system, including the single point failure, location tampering, network cooperative attacks and so on. The most significant parts encompass that, based on blockchain, building a decentralized location service threat model, a proof-of-location algorithm supporting multi-positioning modes, an efficient storage and query method of spatial location data, a privacy protection technology for proof of location based on privacy computing model. Moreover, the scheme plan to breakthrough some key technologies such as proof of spatial location against collusion attacks, efficient spatiotemporal indexing of big spatial data, etc. Furthermore, the program also develops the blockchain-based prototype system of proof of location and verifies key technologies and applications, which provide strong technical support for the development of the trusted location service system.