As discussed in Satoshi Plus Consensus and the Core docs, Validators play a critical role in the Core blockchain network. Validators are “Responsible for producing blocks and validating transactions on the Core network. Becoming a validator requires registering with the network and locking up a refundable CORE deposit in order to be included in the validator set. Anyone can deposit and become a validator on Core.” For their efforts, Validators and their delegates receive block rewards and transaction fees.