School of Computer Science&Engineering;
Guangxi Normal University;
Guilin 541004;
China;
and with the Key Lab of Education Blockchain and Intelligent Technology;
Ministry of Education;
Guangxi Normal University;
Guilin 541004;
China;
and also with Guangxi Collaborative Innovation Center of Multi-Source Information Integration and Intelligent Processing;
Guangxi Normal University;
Guilin 541004;
China;
Guangxi Power Grid Materials Co Ltd;
Nanning 530022;
China;
blockchain; copyright-preserving trade; fair trade; tadors code;