Kusama

an unrefined, experimental, proof-of-stake network that is based on Polkadot’s codebase and acts as a testnet for the Polkadot (DOT) ecosystem

—. “What Is Kusama and How Does It Work? Who Created KSM?” Kriptomat, kriptomat.io/cryptocurrencies/kusama/what-is-kusama/#:~:text=Kusama%20(KSM)%20is%20an%20unrefined,the%20stability%20of%20the%20network.