What is a Blockchain Validator?

A validator is a computer that keeps a blockchain running. It verifies transactions, proposes new blocks, and maintains a full copy of the network’s ledger. On proof-of-stake chains like Solana, validators have replaced the miners from Bitcoin’s world, securing the network with staked capital instead of raw computing power. If you hold SOL and delegate it to a validator, that validator is the machine doing the actual work of keeping Solana alive on your behalf.

Every blockchain needs some way for participants to agree on which transactions are real and what order they happened in. Bitcoin solved this with miners who compete to crack cryptographic puzzles, and the winner gets to add the next block. Proof-of-stake chains hand that job to validators, who put up their own tokens as collateral instead of burning electricity. The protocol picks validators to produce blocks based on how much stake backs them, and it punishes dishonesty by destroying some of that stake.

Validators are not all built the same. Some are run by large institutions with custom hardware in Tier 3+ data centers. Others are run by individuals on rented cloud servers. Those infrastructure differences show up in performance metrics like uptime, block production success rate, and vote latency, and the metrics directly determine how much a validator earns and how much its delegators take home.

What Validators Actually Do

A Solana validator juggles several tasks at once. It receives incoming transactions, checks that each one is properly signed and funded, and groups the valid ones into blocks. When the validator is the designated leader (Solana rotates leadership on a fixed schedule weighted by stake), it proposes a new block to the rest of the network. When someone else is leading, it votes on whether their proposed blocks are correct.

Voting is where consensus actually happens. Validators submit votes confirming each block they have received and verified, and once enough of them (representing a supermajority of staked SOL) have signed off, the block becomes final. How fast validators can receive, verify, and vote on blocks is what determines Solana’s real-world throughput and finality time.

Validators also keep a full copy of Solana’s state in memory: every balance, every smart contract, every account. That state grows over time, which is why the hardware requirements include serious RAM and fast storage. A validator that falls behind on state updates cannot participate in consensus properly.

How Validators Earn Money

Revenue comes from two main buckets: staking rewards and priority fees.

Staking rewards are inflationary. Solana mints new SOL each epoch (roughly every two to three days) and distributes it to validators based on their stake and how they performed during that epoch. Validators that produced all their assigned blocks and voted consistently get full rewards. Those that missed blocks or had significant downtime get less.

Priority fees come from users who want their transactions processed faster. During heavy demand, users attach an extra fee to jump the queue, and that fee goes directly to whichever validator is producing the current block. These fees are not shared across the validator set.

Validators set a commission rate that determines how much staking reward they keep versus how much flows through to delegators. Commissions on Solana typically range from 0% to 10%, and delegators can see the rate before choosing where to stake. A validator running high-quality bare metal hardware with minimal downtime and a fair commission will attract more delegations over time, which grows its stake weight and earning potential in a self-reinforcing cycle.

Cloud vs. Bare Metal

Where a validator runs has real consequences. Cloud validators rent virtual machines from providers like AWS, Google Cloud, or Hetzner. Setup is fast and flexible, but it creates dependencies. If the cloud provider goes down, every validator hosted there drops offline simultaneously, and the network loses a chunk of its stake weight until service comes back.

Bare metal validators run on dedicated physical servers in data centers. The operator owns the hardware, controls the network connections, and handles maintenance directly. That eliminates the shared-failure problem of cloud hosting and typically delivers lower latency because there is no virtualization layer sitting between the validator software and the processor. The tradeoff is higher upfront cost and more hands-on operational work, since the operator handles hardware procurement, rack space, power redundancy, and physical security.

For networks that care about resilience, the mix of infrastructure types matters as much as the raw number of validators. Five thousand nodes that all run on three cloud providers are more fragile than two thousand nodes spread across dozens of independent facilities. Solmate runs bare metal specifically because infrastructure independence is a prerequisite for genuine decentralization.

How to Choose a Validator

If you are staking SOL, the validator you pick affects both your returns and the network’s health. Here is what to look at.

Uptime and block production rate are the most straightforward performance signals. Validators that consistently produce their assigned blocks and maintain high vote success rates earn more for their delegators.

Commission rate determines the reward split. Lower is better for delegators on paper, but a validator at 0% may not be sustainable long-term. A moderate rate (5-10%) from a reliable operator often beats 0% from one that might shut down in six months.

Infrastructure type matters for the reasons above. Bare metal in a Tier 3+ data center with redundant power and networking is more likely to deliver consistent uptime than a shared cloud instance.

Geography affects latency and contributes to network decentralization. Validators in underrepresented regions help spread the network’s geographic footprint, which improves resilience against localized disruptions.

Frequently asked questions