Cross-chain data traceability mechanism for cross-domain access

To address the cross-domain data traceability for data flowing under different trust domains, this paper proposes a cross-chain data traceability mechanism for cross-domain access. By building authorization chains globally and access chains within each trust domain, combined with the cross-chain technology based on notary groups, the mechanism achieves global authorization and transaction of data assets and cross-domain data access and traceability. Meanwhile, the mechanism enhances the trustworthiness of notary groups and solves the trust problem among cross-domain users by introducing a notary group election model based on reputation values. Through the proposed cross-domain data traceability mechanism based on data fingerprinting, the global data ownership transactions, access control policies, and user access records are correlated and tracked, and the traceability of cross-domain data transactions, permission grants, and user access behaviors is achieved. The experimental results show that the mechanism can meet the requirements of cross-domain data traceability.