Validators secure the relay chain by staking KSM, validating proofs from collators, and participating in consensus with other validators.These participants play a crucial role in adding new blocks to the relay chain and, by extension, to all parachains. This allows parties to complete cross-chain transactions via the relay chain. Parachain validators participate in some form of off-chain consensus and submit candidate receipts to the transaction pool for a block producer to add them to the block on the Relay hain. The relay chain validators guarantee that each parachain follows its unique rules and can pass messages between shards in a trust-free environment.