Why are some people's travel codes green?

The founder of health code and travel code is Ma Xiaodong.

Ma Xiaodong, a native of Ningxia Hui Autonomous Region, a young Hui nationality, holds a master's degree in China University of Science and Technology. Born in 1986, he has been a leader in the big data industry and has more than 20 patents. In this COVID-19 epidemic, he led the team to invent the travel code and health code, which provided a good way for the convenience and effectiveness of epidemic prevention.

Introduction of health code and travel code:

1, health code: the health code is to quickly identify whether a person is in contact with patients or passes through a city with severe epidemic by color, and the green code is a normal two-dimensional code; Different regions have different names, such as Yuekang Code in Guangdong, Su Kang Code in Jiangsu and Yukang Code in Henan.

2. Travel code: Travel code is the data received by several domestic communication companies through mobile phones to obtain the location of users. Through the data of this code, I can query all the cities I have been to before 14 days, which is the so-called "traffic big data travel card".