Abstract: Human beings have knocked on the gate of blockchain era; nevertheless, the application of blockchain is almost blank in the field of geology.Even Deep Digital Earth(DDE) and the similar ambitious scientific projects fail to realize the situation that blockchain technology can help the effective collection and utilization of "long tail data" scattered in individual scientists or laboratories.Geological science information is a superlarge shared database, which requires that many people should trust each other so as so complete the rewriting of the database.Blockchain will be a very good support technology. It provides rich interactive interfaces based on its system characteristics and smart contracts, especially it has decentralized, tamper proof and privacy protection characteristics, so that it can provide an important foundation for the application of blockchain technology in the geological field. The traceability management of objects and data from geological exploration as well as the collection of long tail data from a wide scientific community should be an important breakthrough in the geological application of blockchain. Geological certificate makes it possible to build a global geological community.