In Polkadot, validators are responsible for verifying and adding blocks into Relay Chain, and Collators bundle Parachain transactions and produce blocks for validators.

Cosmos vs. Polkadot
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Gaurav Agrawal

Tiny Crypto Labs
1 min readJul 22, 2019

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So does this mean there are separate validators for the Polkadot relay chain, as well as each of the parachains?

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