关键词: 大数据；计算合约；多方安全计算, 区块链；贷款风控

Abstract: Data is a new foundational and strategic resource of our country. It has attracted great attention from the whole society to construct an emerging data capitalization market, but the ensuing data privacy leakage problems, data abuse and other issues have also been paid attention to.  Privacypreserving computation has solved the problem by “using data without seeing data”, but there is still a lack of effective regulatory technology and means for data usage. The risk of dataabuse still exists. To build a healthy and orderly data capitalization market, it is necessary to construct a solid trust foundation and a series of intelligent supervision measures. Guided by the technical idea of decentralized and multiparty mutual supervision as well as combined with secure multiparty computing technology in computing, this paper studies and designs a new smart contract named computation contract. The content of the computational contract is mutually confirmed by multiple parties and can be executed automatically. The algorithm is open and verifiable, and the whole process of execution is traceable and supervisable, which realizes the secure control of data circulation and use. The designed smart contract has been applied to the Beijing Big Data Exchange to provide support for a bank to calculate the loan amount by integrating data from multiple parties, demonstrating the execution process of the whole life cycle of the computation contract and the related process is traceable and supervisable. The research results have good demonstration effect and can provide strong support for the development of digital economy.

Key words: big data, computation contract, secure multiparty computation, blockchain, loan risk management