Glossary
Fusaka Upgrade
The Ethereum upgrade following Pectra that ships PeerDAS (EIP-7594), scaling blob data availability through peer-to-peer sampling so rollups can post far more data cheaply.
Fusaka ("Fulu" on the consensus layer + "Osaka" on the execution layer) is the Ethereum upgrade that follows Pectra. Its headline feature is EIP-7594, better known as PeerDAS, which introduces data availability sampling: instead of every node downloading all of a block's blobs, validators custody and serve only a subset of the erasure-coded blob columns over the peer-to-peer network.
Because no single node stores everything, PeerDAS lets Ethereum raise the blob count per block without increasing per-node bandwidth, pushing rollup data costs even lower after Dencun's initial drop. The fork also bundles smaller execution-layer changes and blob-parameter tuning, marking Ethereum's next major step on the road toward full danksharding.