A consensus mechanism where validators are chosen to create blocks in proportion to the amount of cryptocurrency they lock as stake, replacing energy-intensive mining with economic commitment.
Proof of Stake (PoS) replaces the computational race of Proof of Work with an economic lottery weighted by stake. Validators lock collateral (32 ETH on Ethereum) and are randomly selected to propose new blocks and attest to proposed blocks from others. Honest validators earn staking rewards; validators who act dishonestly (double-vote, go offline) face slashing - a portion of their stake is destroyed as a penalty.
Ethereum completed its transition from PoW to PoS in September 2022 ('The Merge'), making it the most significant blockchain network to adopt PoS. The transition eliminated the role of miners and their hardware, replacing them with validators whose collateral secures the network. Ethereum's PoS offers approximately 3–5% annual staking yield, partially funded by transaction fees (EIP-1559 base fees are burned, reducing ETH supply).
PoS has spurred the growth of liquid staking - protocols that allow users without 32 ETH to participate in staking by pooling assets. This has created a new category of yield-bearing crypto assets (stETH, rETH) that are deeply integrated into DeFi as collateral. The concentration of stake among a few large liquid staking providers (Lido controls ~30% of staked ETH) is debated as a centralisation risk.
For traders, PoS introduces deflationary dynamics: ETH burned in base fees can exceed new ETH issuance during high-activity periods, making ETH net-deflationary. Tracking issuance and burn rates (ultrasound.money) is a fundamental indicator used by ETH-focused traders.
Worked Example
Ethereum's staking yield is 3.8% APY with 32 million ETH staked. A validator with 32 ETH earns approximately 1.22 ETH per year (≈ USD 3,650 at ETH/USD 3,000). On a high-activity day, EIP-1559 base fee burns 2,100 ETH while new issuance is only 1,700 ETH - making ETH net-deflationary by 400 ETH that day. Traders monitoring ultrasound.money track this supply dynamic as a fundamental bullish signal when high network usage persistently drives ETH supply below its pre-Merge level.
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