# 2.3  Data Layer

Personal data has multiple dimensions: personal basic data, consumption data, learning data, social media data, health data, etc. Data generators and evaluators include governments, hospitals, schools, banks, e-commerce companies, Internet social platforms and other institutions and companies. Through the BDCP protocol, individuals can firmly control the ownership of data. At the same time, individuals can easily authorize others to use their data, so that the data can be effectively used and privacy protected.


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