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What Is the Primary Revenue Source for Validators in a PoS System besides Transaction Fees?

The primary revenue source for validators in a Proof-of-Stake (PoS) system, besides the transaction priority fees, is the issuance of new native cryptocurrency (e.g. ETH) as a staking reward.

This reward compensates validators for their service in securing the network, proposing and attesting to new blocks, and maintaining network consensus. This issuance is often a pre-determined, algorithmically adjusted rate.

What Is the Difference between Proof-of-Stake (PoS) Staking and Liquidity Pool Staking?
What Is the Role of a Validator in a Proof-of-Stake Network?
How Does the Choice of Gas Fee Token (Native Vs. Stablecoin) Influence the Native Token’s PQ?
How Does the “Base Fee” and “Priority Fee” System Work under EIP-1559?