There is a widely used introduction to differentiate Web1, Web2, and Web3: Web1 is read, Web2 is read and write, and Web3 is read, write and own. In web2, people don’t have any control over their data and decide how those data are stored. Instead, companies often track and save user data without their users' consent. To some extent, Web2 has been bringing a lot of convenience to people's life. Benefiting from Facebook and other social media, people are able to connect with people gl...