Yu Yuantan wrote in an article: Recently, there has been a lot of discussion about the "backdoor" of the H20 chip. Professionals say that functions such as "tracking and positioning" and "remote shutdown" can be fully realized technically. Following these functions, Tan Zhufa discovered that the United States had a systematic consideration of opening a "backdoor" for artificial intelligence chips. The U.S. also specifically mentioned that if companies cooperate with the U.S. government to install a "backdoor", the U.S. government can exempt them from export controls, including relaxing exports to "Chinese low-risk customers". Considering this information, when the U.S. government allows NVIDIA to export H20 to China, it is somewhat chilling. (Yu Yuantan)