Proof of Stake — Consensus Without Mining
In Proof of Stake (PoS), validators secure the network by locking up their own coins as collateral. Stakers earn rewards — essentially interest on held tokens. Sounds attractive, but there are catches: yields aren't guaranteed, and misbehaving validators risk slashing — losing part of their staked coins.
Since Ethereum's Merge in September 2022, PoS is the dominant consensus mechanism. Energy consumption: a fraction of Proof of Work. That defused the ESG debate but raised new questions — especially around centralization through large staking pools.
Staking Yields: What's Behind Them
5% APY sounds good, but where does the yield come from? For most PoS chains, from new token emission — inflation. If staking yield is 5% and inflation is 4%, you're left with 1% real return. Some chains compensate through fee burns (like Ethereum post-EIP-1559), others don't.
Liquid staking (Lido, Rocket Pool etc.) changed the game: stake and keep your liquidity. Convenient, but adds another trust layer.
Centralization and Other Risks
The biggest PoS risk: those with more coins get more voting power and more rewards. This can create concentration that contradicts the decentralization promise. At Ethereum, the top 3 staking providers control over 50% of staked ETH. Not ideal. Always check validator distribution, not just APY.
