According to the news from Shangguan News, on March 2, the first domestic blockchain application for security prevention and control management of sales cases, the intelligence control chain of the cases was officially launched, and some sales offices in Shanghai will adopt this technology. Yu Zhisheng, Product Director of E-House China Intelligent Control Chain Product Line, said that at the sales office where the office's intelligent control chain is used, employees and visiting customers need to scan the code. Health records and cleaning and disinfection information can be updated on the chain in real time. It cannot be tampered with, but can be traced. With the authorization of the housing company or the sales office, the government supervision department can see detailed information and monitor it in real time to ensure that the epidemic prevention and control status at the sales office is true and transparent.