Crypto Basics #8 — Understanding Proof of Stake

Every blockchain needs a way to decide whose version of the record is the correct one. That process is called consensus, and proof of stake is one of the main approaches in use today.

The older method, proof of work, has computers compete by solving hard mathematical puzzles. Whoever solves one first gets to add the next block. It's secure, but it uses a large amount of electricity, because the competition itself is the cost.

Proof of stake takes a different route. Instead of burning energy, participants called validators lock up a portion of the network's own tokens as collateral. The network then picks validators to confirm transactions and add blocks. The stake is what keeps them honest: a validator who tries to cheat can lose part of the tokens they put up. Good behavior is rewarded, bad behavior is penalized.

The practical result is a system that reaches the same goal, a secure and agreed-upon record, while using a fraction of the energy. Ethereum moved to proof of stake for exactly this reason, and many newer networks were built on it from the start.

In short: Proof of stake secures a blockchain by having validators put up tokens as collateral, replacing the heavy energy use of proof of work.

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