Kusama (KSM) is the official coin in the Kusama ecosystem. It is considered to be the working fuel of the entire network. Kusama is a "dedicated" Polkadot network that detects and warns of any vulnerabilities in the Pokadot network. KSM is used to pay commission for transactions on the network, as remuneration, and provide an opportunity to vote in referendums on the development of the project.