Nanchong bidding can use sichuan ca. According to the query related to public information materials show that from April 29, 2022, Chongqing, Luzhou, Nanchong, Guang'an, Sichuan, four places to achieve public *** resources trading CA digital certificate mutual recognition of universal, market players for the standard e certificate mobile CA digital certificate, you can participate in the four places of the public *** resources trading activities without any obstacles.