"CGTN (formerly known as CCTV-9 and CCTV News) is an international English-language cable TV news service based in Beijing, China. It is one of six channels provided by China Global Television Network, owned by the Chinese state media China Central Television (CCTV), under the control of the Propaganda Department of the Chinese Communist Party."
This video mentions blockchain, but I can't find anything online about how exactly the digital yuan uses blockchain.
China released a whitepaper on Digital Yuan. Does not contain many technical details though.