This story was originally published on HackerNoon at: https://hackernoon.com/a-simple-guide-to-kzg-commitments-and-why-ethereum-needs-them-to-scale.
Practical guide to polynomial commitments and KZG, showing how zk-rollups, Proto-Danksharding and PeerDAS scale data and proofs on Ethereum.
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This article demystifies polynomial commitment schemes and explains how KZG lets provers commit to polynomials and later prove evaluations with tiny, verifiable proofs. It then shows how zk-rollups, Proto-Danksharding (EIP-4844), and PeerDAS all rely on these commitments and erasure coding to scale Ethereum’s data availability and proof systems efficiently.

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