基于区块链、数字水印以及密封递价拍卖的组合竞拍算法, 设计并实现了一套数据版权保护与组合竞拍系统. 首先, 采用去中心化的区块链技术, 结合智能合约来存储数据版权的上链记录、版权交易记录等, 通过共识机制使得网络中的各个节点在互不信任的情况下达成共识, 提升了版权管理系统的公信力. 其次, 数字水印作为一种特殊的编码, 能够将水印信息隐藏在数据中, 通过验证水印信息就可甄别版权归属. 结果表明, 所设计的数字水印模块对原始数据大小增加很少, 且可高效地实现数字水印的嵌入和提取. 最后, 设计了一种组合竞拍算法来自动化地为版权拥有者挑选出最优的出价组合, 实现数据版权的价值交换.

A data copyright protection and combinatorial auction system was designed and implemented based on blockchain, digital watermark and sealed bids combinatorial auction. First, a smart contract was applied to store the copyright data and their transaction record via a decentralized technique known as blockchain, which could achieve consensus between each node who did not trust each other. Consequently the system could be rendered more trustworthy. Moreover, a digital watermark was a unique code hidden in data, which could be used to prove the ownership of copyright. The results showed that the watermark module used in the system barely altered original data and was efficient when embedding and extracting watermark. Finally, a combinatorial auction algorithm was designed to select an optimal bid combination automatically to implement the value exchange of data copyright.