Since I was a child, I have liked to collect medals. When I was in school, I liked to exchange with my classmates. When I grew up, I came into contact with the blockchain and the world of cryptocurrencies. Then I slowly opened the mysterious door of Web3. In social media, there is an issue about soul binding, proposition about soul binding, which is related to attendance agreement, identity certificate, on-chain certificate, and other elements. At first, I came into contact with poap, and I c...
