What is PoS (Proof of Stake)?
Crypto Glossary Definition
The ability to mine cryptocurrency by simply holding coins in a wallet that is connected to the network. The more coins in the wallet, the more mining power.
Why PoS (Proof of Stake) Matters
Proof of Stake replaces mining with staking: validators lock up coins as collateral, and can lose that stake ("slashing") if they act dishonestly. It uses a small fraction of the electricity Proof of Work requires, which is why Ethereum switched to it in 2022.
PoS (Proof of Stake) in Practice
Consider someone who wants to help secure the Ethereum network and earn rewards for doing so, choosing to run a validator under Ethereum's proof-of-stake system rather than buying mining hardware the way a Bitcoin miner would have needed before Ethereum's 2022 transition. She locks up 32 ETH as her stake, essentially collateral she's putting at risk to back her honest participation, and her validator software is then periodically selected to propose or attest to new blocks, earning modest rewards each time it behaves correctly. A few months in, a bug in her validator setup causes it to briefly sign two conflicting blocks at the same height, a serious protocol violation, and the network automatically slashes a portion of her staked ETH as a penalty, a stark reminder that staking isn't risk-free passive income but genuinely collateralized responsibility. She also notices her validator's energy footprint is negligible compared to what a proof-of-work mining rig would consume, since proof-of-stake replaces the energy-intensive computational race of mining with this staked-collateral model instead, using a small fraction of the electricity, which was itself one of the central reasons Ethereum's developers cited for making the switch away from proof-of-work in the first place.
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