[Zheng, Lijing] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
[Kan, Haibin] Fudan Univ, Sch Comp Sci, Shanghai Key Lab Intelligent Inform Proc, Shanghai 200433, Peoples R China.
[Kan, Haibin] Shanghai Engn Res Ctr Blockchain Shanghai, Fudan Zhongan Joint Lab Blockchain & Inform Secur, Shanghai 200433, Peoples R China.
[Peng, Jie] Shanghai Normal Univ, Math & Sci Coll, Guilin Rd 100, Shanghai 200234, Peoples R China.
[Zheng, Lijing] Guangxi Univ Sci & Technol, Coll Comp Sci & Commun Engn, Liuzhou 545006, Peoples R China.