DATA CHAIN is a decentralized big data value economy ecosystem based on blockchain technology. Serving as the unit of exchange between users, data buyers, and data suppliers, it quantifies the value of data. The DTCH platform rewards a wide range of users for contributing anonymous big data and provides more efficient consumption options for data buyers. It aims to change the status quo where ordinary users are at the bottom of the value chain by creating a fairer and more transparent data trading environment.