In blockchain networks, reaching effective supervision while maintaining anonymity to the public has been an ongoing challenge. In existing solutions, certification authorities need to record all pairs of identities and pseudonyms, which is demanding and costly. This article proposed an account guarantee scheme to realize feasible supervision for existing anonymous blockchain networks with lower storage costs. Users are able to guarantee anonymous accounts with account guarantee key pairs generated from certificated polynomial functions, which inherently maintains one-to-n mapping certifications. Single or limited account guarantee key pairs do not leak privacy. Victims are able to request TCs to screen a cheater or disclose a cheater with enough fraud transactions by themselves. Detailed security and privacy analysis showed that the account guarantee scheme preserves user privacy and realizes feasible supervision. Experimental results demonstrated that the account guarantee scheme is efficient and practical.
Bibliographical noteKAUST Repository Item: Exported on 2021-02-08
Acknowledgements: This work was supported in part by the Natural Science Foundation of China under Grant 61672092, the Fundamental Research Funds for the Central Universities of China under Grant 2018JBZ103, the Major Scientific and Technological Innovation Projects of Shandong Province, China (No.2019JZZY020128), and the State Scholarship Fund of China under Grant 201907090024 from China Scholarship Council.