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How does a blockchain agree without staking electricity?
💡 Proof of Stake secures a blockchain by making validators put their own money at risk, replacing Proof of Work's electricity-burning race with slashable financial collateral.
Every blockchain faces the same problem: with no central authority, who gets to decide the next block of transactions? Bitcoin answers with Proof of Work — miners race to brute-force a numeric puzzle, burning enormous electricity, and the first to solve it wins the right to add a block. The energy cost is the point: rewriting history would mean re-doing all that work.
Proof of Stake (PoS), used by Ethereum since 2022, replaces the electricity race with economic collateral. Validators lock up a deposit — on Ethereum, 32 ETH — and the protocol pseudo-randomly picks one to propose each block. Other validators then attest (vote) that the block is valid. Your chance of being chosen scales with how much you've staked, not how many chips you can spin.
The security trick is slashing: if a validator tries to cheat — say, signing two conflicting blocks — the protocol destroys part of their staked deposit. So instead of "attacking is expensive because you burn power," PoS says "attacking is expensive because you lose your own money." This cut Ethereum's energy use by roughly 99.9%, though critics note it can concentrate influence among those who already hold the most coins.