Yu Cao Xuehui Du Xiangyu Wu Qiantao Yang Wenjuan Wang Shihao Wang An efficient consortium blockchain privacy protection scheme based on group signatures and bulletproofs. 110323 2025 124 Comput. Electr. Eng. https://doi.org/10.1016/j.compeleceng.2025.110323 db/journals/cee/cee124.html#CaoDWYWW25 streams/journals/cee