Glossary
PeerDAS
An early form of Ethereum data availability sampling where validators fetch and custody only a subset of each block's blob columns, sharing them peer-to-peer to scale blob capacity safely.
PeerDAS (Peer Data Availability Sampling) is Ethereum's first practical step toward full danksharding. Instead of every node downloading all of a block's blobs, the erasure-coded blob data is split into columns, and each validator is only responsible for custodying and serving a small subset of those columns over the peer-to-peer network.
To confirm availability, a node samples random columns from its peers; if the requests succeed, it is statistically confident that the entire data set was published and can be reconstructed. Because no single node stores everything, PeerDAS lets Ethereum raise the number of blobs per block without increasing per-node bandwidth and storage, delivering cheaper rollup data on the road to full data availability sampling.