IntroductionCredentials and badges are important components of the on-chain identity system, representing user on-chain behavior records, skill certification, proof of contribution, etc. At present, the projects and products of related concepts on the market include POAP, Galxe (OAT), NOOX (SBT), Philand (Objects), etc. Through the comparison and analysis of current and past data for the four projects, this research aims to show the development of the credentialing and badging sector.Project ...