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Proof of work vs proof of stake: two ways a blockchain agrees

A blockchain has no boss checking the records. So how does everyone agree on who owns what? Proof of work and proof of stake are the two main answers, and they work very differently.

Comparison · 6-minute read · Updated 2026-10-21

The short answer

Proof of work (PoW) asks computers called miners to race to solve a hard puzzle. The winner adds the next block and earns new coins. Cheating would need huge amounts of computing power and electricity. Bitcoin uses proof of work.

Proof of stake (PoS) asks validators to lock up coins as a deposit (a "stake"). Validators are chosen to add blocks. If they cheat, they can lose part of the deposit. Ethereum has used proof of stake since September 2022.

Both are ways to make cheating cost more than it could ever pay.

Side by side

Proof of work, in plain words

Think of a lottery where every ticket costs electricity. Miners make trillions of guesses. The first to find a valid answer adds the block.

The good parts:

• Long track record. Bitcoin has run on it since 2009.
• Security tied to the real world. Attacking it would need enormous hardware and power.
• Simple rules. It's easy to check that work was done.

The limits:

• Energy use. Mining uses a lot of electricity.
• Mining centralises. Big, cheap-power operations have an edge.
• Rewards shrink. For Bitcoin, the new-coin reward halves about every four years. The latest halving was in April 2024. See Bitcoin halving.

Proof of stake, in plain words

Think of a deposit. You lock up coins to earn the right to help. Behave well and you earn rewards. Break the rules and you can lose part of the deposit.

The good parts:

• Far less energy. Ethereum's switch cut its energy use by more than 99%, according to the Ethereum Foundation.
• No mining machines. Running a validator needs a normal computer and the stake. On Ethereum, a solo validator needs 32 ETH.
• Holders can take part. Many people stake through exchanges or staking services.

The limits:

• Rich-get-more worry. More coins can mean more rewards and more say.
• Shorter track record than proof of work at Bitcoin's scale.
• Staking has its own risks. See below.

What staking means for you

If you stake coins, you may earn rewards. But:

• Rewards aren't guaranteed, and they're paid in the coin, whose price can fall a lot.
• Your coins may be locked for a while, or take time to withdraw.
• Slashing can cut a validator's stake if it misbehaves or breaks the rules.
• Staking through a company means trusting that company with your coins. See centralized vs decentralized exchange.
• Rules and taxes vary. In the US, staking rewards are generally treated as taxable income. Check with a tax professional.

Does it matter to a trader?

Mostly, it matters as background. The chart still shows what buyers and sellers do. A few links to price:

• Supply rules. Bitcoin's supply is capped at 21 million, with the reward cut at each halving. Proof of stake coins have their own issuance rules.
• Big upgrades can bring news-driven swings.
• Staking flows. Large amounts going into or out of staking can show up in the news.

None of this tells you where price goes next. It explains why the coins work the way they do. See bitcoin and ethereum.

Which fits you?

You don't pick a system to trade. You pick coins, and the system comes with them.

1. Want to understand what you hold? Learn which system your coin uses and how new coins are created.
2. Thinking of staking? Read the lock-up rules, the risks and the fees first. Start small.
3. Just trading the chart? The same rules apply as any market: a stop from the chart, size from the stop. If you use leverage, check the crypto liquidation calculator.

Common mistakes

• Thinking staking rewards are free money. The coin's price can fall far more than the reward.
• Staking with an unknown site. Fake staking sites are a common scam.
• Believing one system is "the future". Both are still evolving. Stick to facts.
• Ignoring lock-up periods. You may not be able to sell quickly.

Questions