1. Computer Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054 China, and also with the UESTC-CDFH Joint Institute of Blockchain Chengdu Jiaozi Financial Holding Group Co. Ltd., Chengdu 610042 China (e-mail: emmanuelsifah@yahoo.com).
2. Computer Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054 China, and also with the UESTC-CDFH Joint Institute of Blockchain Chengdu Jiaozi Financial Holding Group Co. Ltd., Chengdu 610042 China (e-mail: xiaqi@uestc.edu.cn).
3. Computer Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054 China, and also with the UESTC-CDFH Joint Institute of Blockchain Chengdu Jiaozi Financial Holding Group Co. Ltd., Chengdu 610042 China (e-mail: obour539@yahoo.com).
4. Computer Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054 China (e-mail: xiahu@uestc.edu.cn).
5. Computer Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054 China, and also with the UESTC-CDFH Joint Institute of Blockchain Chengdu Jiaozi Financial Holding Group Co. Ltd., Chengdu 610042 China (e-mail: ababla886@yahoo.fr).
6. UESTC-CDFH Joint Institute of Blockchain, Chengdu China, with the Chengdu Jiaozi Financial Holding Group Co. Ltd, Chengdu 610042 China, and also with the School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 610054 China (e-mail: ababla886@yahoo.fr).