What is proof of stake?
In one line: Proof of stake is a way for a blockchain to agree on new blocks, where validators lock up coins as a deposit and can lose part of it for cheating.
How it works
A Blockchain needs a fair way to pick who adds the next block. In proof of stake, the people who do it are called validators.
- A validator locks up coins as a deposit, called a stake.
- The network picks validators to propose and check new blocks.
- Honest work earns rewards, paid in the network's coin.
- Cheating, like signing two different blocks, can cost part of the stake. That's called slashing.
The stake is what keeps people honest. Attacking the network means risking a lot of your own coins.
A simple example with numbers
On Ethereum, running your own validator takes 32 ETH.
Say the network's yearly reward rate were 3% (it changes, so check a current source). 32 ETH × 3% = 0.96 ETH over a year in rewards, before any costs. A math example, not a promise. The ETH price can fall far more than that in a week.
Most people don't have 32 ETH. They use a staking service or an exchange, which pools coins and takes a fee.
Why it matters
Ethereum switched from Proof of work to proof of stake in September 2022, an event called "the Merge." Its energy use fell by over 99%, because no mining machines are racing anymore.
Many newer networks, like Solana and Cardano, also use forms of proof of stake.
Common mistakes and tips
- Treating staking rewards as safe interest. Rewards are paid in a coin whose price swings. You can earn coins and still lose money in dollars.
- Forgetting lock-up times. Some staking takes days or longer to undo. You can't always sell quickly.
- Ignoring who holds your coins. Staking through an exchange means the exchange holds them.
Check how rewards are taxed where you live. In the US, staking rewards are generally treated as income when you receive them.
More in crypto trading for beginners.
Questions
What is the difference between proof of stake and proof of work?
Proof of work uses computing power and electricity to secure the chain. Proof of stake uses coins locked up as a deposit.
Is staking crypto risky?
Yes. The coin's price can fall, some staking locks up your coins, and validators can be slashed for mistakes.
Does Bitcoin use proof of stake?
No. Bitcoin uses proof of work.
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