Validator or miner
The words describe the same job under two different systems for deciding who gets to do it.
Under proof of work, miners compete by spending computing power on a puzzle. Whoever solves it first proposes the block and collects the reward. Bitcoin, Litecoin and Dogecoin work this way, and the security comes from the cost of the electricity.
Under proof of stake, validators lock up the network’s own token as collateral, and the protocol selects who proposes each block, weighted by stake size. Ethereum, Solana, TON and BNB Chain work this way, and the security comes from the value at risk.
What a validator actually does
Three tasks in a loop.
Verify
Check that incoming transactions are properly signed and that the sender has the balance.
Propose or attest
When selected, assemble a block. The rest of the time, confirm that blocks proposed by others are valid.
Stay online
Availability is part of the job, and networks penalise validators that go missing.
Misbehaviour has a price. Proof-of-stake networks slash part of a validator’s stake for signing conflicting blocks or for prolonged absence, which makes attacking the network expensive in a way that does not depend on trusting anyone.
Why validator counts differ so much
This is where the number becomes informative, and the range is wider than most people expect.
Ethereum has hundreds of thousands of validators, because the hardware requirement is modest and staking pools let small holders participate. Solana has on the order of a thousand or so, because running one requires substantially heavier equipment. TRON operates with twenty-seven elected super representatives producing blocks.
Fewer validators generally means faster agreement and more concentrated control. More validators means the opposite. Neither arrangement is a mistake; they are different points on the same trade-off, and the choice shows up in exactly the properties a merchant notices: speed, cost and how a network behaves under stress.
Why this matters for a payment
Indirectly but really.
The confirmation threshold you set exists because validators can, in principle, produce competing versions of history. The cost of doing that is what makes deep confirmations safe, and that cost comes from either electricity or staked value.
It also explains network outages. A chain whose validators run demanding hardware and coordinate tightly can halt entirely if that coordination fails, which is what happened to Solana in 2021 and 2022. A chain with many independent validators is slower and harder to stop.