A Decentralized and Accountable Redactable Blockchain Scheme
The blockchain is immutable and can permanently store data on the chain,but it also prevents harmful data from being deleted and incorrect data from being updated.Existing redactable blockchain schemes endow the blockchain with the function of data editing.However,the existing research has the problem of centralizing of editing power,which violates the idea of blockchain decentralization.At the same time,the existing schemes have an accountability problem when verifying the edited block.To this end,a decentralized and accountable redactable blockchain scheme is proposed.In this scheme,a decentralized chameleon Hash function is designed to generate chameleon Hash trapdoors through multiple user nodes to manage trapdoors in a decentralized manner.A random selection stage and a review and accountability stage for editing nodes are added to achieve controllable supervision of editing rights.A security analysis of this scheme is conducted,and the analysis results show that the scheme is both editable and feasible.The algorithm running time of each stage is used as the evaluation index,and the comparison experiment is conducted with the existing redactable blockchain scheme,the experimental results show that the scheme has better running efficiency.
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