What does CTID network certificate mean?

"Electronic authentication" is a new authentication method, that is, using "electronic identity" to replace the traditional entity ID card for transactions. "Electronic Identity" is a popular name, which is the electronic certificate corresponding to the resident entity ID card. The official name of the "electronic identity" issued by Unicom through China Unicom APP is "Electronic Certificate of Resident Identity Card", and the technical term is "Trusted Certificate of Resident Identity Network", which is abbreviated as "CTID Network Certificate".