Kusama is Polkadot’s “canary network”, a scalable, multi-chain network for radical innovation and early stage Polkadot deployments. For developers, Kusama is a proving ground for all things Polkadot I.e runtime upgrades, on-chain governance, parachains, parathreads, etc.
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This wiki was started by and is maintained by Web3 Foundation. It is an open-source-ish project and aims to be the most extensive resource of knowledge on Polkadot and the Polkadot ecosystem.