Proof of Work vs Proof of Stake: How Blockchains Agree
Proof of work vs proof of stake compared on security, energy use and decentralization, with a plain-English look at mining, staking, slashing and 51% attacks.
Web3 & Blockchain
What is Proof of Stake?
Quick answer
A blockchain consensus mechanism in which validators lock up cryptocurrency as collateral to earn the right to propose and confirm blocks.
Proof of Stake, explained
In proof of stake, instead of competing with computing power, participants called validators stake coins, effectively putting money at risk as a security deposit. The protocol selects validators to propose new blocks and others to attest that those blocks are valid. Honest participation earns rewards, while provably dishonest behavior can lead to slashing, where part of the stake is destroyed.
Because it does not require energy-intensive mining, proof of stake uses far less electricity than proof of work. Ethereum switched to proof of stake in 2022, and many newer blockchains use it or variations. Critics raise concerns that wealth can concentrate influence among large holders and staking services, which may affect decentralization over time.
Related terms
Blockchain
A shared, append-only digital ledger in which records are grouped into blocks that are cryptographically linked in sequence.
EthereumA programmable blockchain platform, launched in 2015, that runs smart contracts and has its own cryptocurrency called Ether.
Proof of WorkA blockchain consensus mechanism in which miners compete to solve computational puzzles to add new blocks and secure the network.
Guides that mention Proof of Stake
What Is Blockchain? A Plain-English Explanation
Blockchain explained without jargon: how blocks, hashes and consensus work, why records are hard to change, where blockchains help and where an ordinary database is better.
Public vs Private Blockchain: Key Differences
How public and private blockchains differ on access, privacy, speed, cost and trust, what a permissioned network is, and why many enterprises pick private or consortium chains.