Journal
IEEE ACCESS
Volume 8, Issue -, Pages 6060-6070Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2019.2962816
Keywords
Blockchain; privacy protection; deletable; linkable multi-signature
Categories
Funding
- National Natural Science Foundation of China [U1736120, 61572309]
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A deletable blockchain has been proposed recently to change the immutability of the traditional blockchain. However, the users & x2019; identities and transaction contents are all public in the scheme, and the public data may reveal the users & x2019; privacy. In order to protect the privacy of the users, we propose a privacy-protected deletable blockchain based on the proof-of-space consensus mechanism, which does not rely on complex cryptographic tools or any trusted party. In order to satisfy full transparency and accountability in an anonymous environment, we use a traceable ring signature or a Pedersen commitment scheme to disclose the users & x2019; real identities or the real transaction contents respectively according to different deletion reasons. During the deletion process, we propose a linkable multi-signature scheme, which allows multiple users to generate a valid signature by using their one-time addresses as pseudonyms to protect their identity privacy. Moreover, the proposed multi-signature scheme can link two sub-signatures if they are generated by the same malicious user. Finally, we simulate the generation and deletion process of a block under the proof-of-space consensus mechanism and give the time of generating and deleting a block. The experimental results prove the efficiency and feasibility of our proposed scheme.
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