关键词: 区块链, 激励机制, 数据拍卖, 信息熵, 隐私保护

Abstract: The development of cloud computing, big data, Internet of things and other technologies has laid the foundation for data sharing. Currently, governments all over the world are encouraging data sharing and trading to promote the connectivity between data and stimulate the development of big data economy. However, because the data themselves contain a lot of private information and the data sharing process lacks incentives, most data owners are reluctant to participate in the sharing. Based on this, a data sharing scheme combining auction and privacy protection  emerges. But in these auction methods, the data reserve price is not taken into account, and the relevant interests of the data requester are ignored. Therefore, this paper designs a data incentive sharing scheme based on auction mechanism to meet the interests of both parties. Firstly, attribute-based access control technology is used to prevent unauthorized requestor from entering the auction process. Secondly, in combination with the auction in the real scene, information entropy is used to set a hard reserve price for data. In order to prevent the requestor from overexaggerating the value of the owner's data in the auction process and causing the winner to regret, the soft reserve price is set as the ideal maximum transaction price of the owner. Finally, the Pedersen promise is used to hide the bid of the requester, and the zero-knowledge range proof is used to verify the bid information of each requester, and the blockchain is used to realize the public accountability of the data transaction results. The experimental analysis shows that the auction scheme can satisfy the interests of both parties and realize the individual rationality, weak budget balance and incentive compatibility of all participants.

Key words: blockchain, incentives, data auctions, information entropy, privacy protection