关键词: 区块链, 智能合约, 数据安全, 隐私保护, 发展现状

Abstract: Smart contract is the program code that can be shared on the blockchain, involving account address, digital assets and other information. In recent years, smart contracts develop rapidly, expanding the blockchain platform from a simple distributed ledger system to a rich decentralized operating system, leading the era of blockchain 2.0. However, smart contracts are facing a serious problem of privacy disclosure, which limits the further development and application of smart contract technology. This paper analyzes four smart contract privacy protection key technologies of zero knowledge proof, secure multiparty computing, homomorphic encryption and trusted execution environment, summarizes the latest research results of current smart contract privacy protection solutions, and prospects the future research direction.

Key words: blockchain, smart contract, data security, privacy protection, development status