Kusama Network (KSM) is a network of blockchains built with Substrate and almost the same code base as Polkadot. The network is an experimental development environment for teams who want to test and innovate in Kusama or prepare for deployment on Polkadot.

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Kusama

Referendum 189, passed community vote Monday, upgrading the runtime to v0.9.19. This release included minor uniques pallet improvements, XCM v3 preparations, child bounties configuration, implemented lower staking limits, and more!
https://t.co/TCLusQYNHk