近年来，区块链技术逐步从数字货币领域，延伸到供应链管理、物联网、智能制造等多个传统行业。区块链的实质是一种去中心化、防篡改和可信任的分布式数据管理系统。但跟面向现代企业应用的数据库管理系统相比，已有的区块链系统还存在着存储容量受单节点限制、交易吞吐率低和查询接口单一等局限性。在多方参与、互不可信的分布式环境下，为了满足现代企业对区块链数据管理的需求，本项目主要研究：（1）设计可验证、可恢复的数据分片存储机制；（2）设计支持大规模网络的拜占庭容错的确定性共识算法；（3）设计高效安全的智能合约并发控制协议；（4）设计面向轻客户端的可验证查询；（5）开发区块链数据库系统，并集成以上四项研究内容，验证其有效性。相关研究成果将为区块链技术应用到传统行业奠定技术基础和提供新的解决思路，因此具有重要的理论和实践意义。申请人及其团队在区块链及数据管理方面有良好的积累，项目实施可行性强。

In recent years, blockchain technology has gradually extended from the field of digital currency to many traditional industries such as supply chain management, Internet of things and intelligent manufacturing. The essence of blockchain is a kind of decentralized, immutable and trusted distributed data management system. However, compared with the database management system for modern enterprise application, the existing blockchain system still has some limitations, including storage capacity limited by a single node, low transaction throughput and lacking of query interface. In a multi-participating and non-trusted environment, in order to meet the needs of modern enterprises for blockchain data management, this proposal mainly focuses on five key aspects: (i) design verifiable and recoverable data partition mechanism; (ii) design Byzantine Fault Tolerance deterministic consensus algorithm for large-scale network; (iii) design efficient and secure smart contract concurrency control protocol; (iv) design authenticated query for light clients; (v) develop blockchain database system integrating the above mentioned four research points to verify its effectiveness. The relevant research results are expected to lay a technical foundation and provide new solutions for the application of blockchain technology to traditional industries. Therefore, it has important theoretical and practical significance. The applicant and her team have strong research background in blockchain and data management. The feasibility of this proposal is strong.