Ontology is a public blockchain that brings decentralized identity and data solutions to Web 3.0. Its open-source network provides a platform for creating smart contracts and deploying decentralized applications. The project focuses on enabling self-sovereign identification (ID) and data management. Ontology features a two-token system. ONT allows holders to contribute to the network's security mechanism and take part in governance decisions, while ONG is used for paying transaction fees. The Ontology mainnet officially launched in June 2018.