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We reached a significant step towards implementing parachain functionality on Polkadot – we launched a new testnet specifically designed for parachains and their related technologies, dubbed Rococo. The Rococo testnet integrates Polkadot with Cumulus and HRMP.

Polkadot guarantees valid state transitions for its member parachains. Beneath the surface, an orchestra of nodes, from validators and collators to fishermen and full nodes, play their parts to deliver parachain blocks to the final Relay Chain.