Fusaka PeerDAS: Vitalik Buterin Explains Ethereum’s Next Big Upgrade

Today Ethereum co-founder Vitalik Buterin posted about the upcoming upgrade and its central feature. Vitalik said Fusaka PeerDAS will let nodes check pieces of block data instead of downloading everything, which helps scale Layer-2s and, later, Layer-1. This note pushed fresh attention to Fusaka and to testing plans from core devs.

Vitalik Says, Fusaka’s PeerDAS Brings Data Availability Scaling to Ethereum

Vitalik’s main message: safety first, and PeerDAS is the key part of new update that makes data availability cheaper and easier. He explained that nodes will sample small “chunks” of information to prove a block is available.

If enough chunks are found, nodes can reconstruct the whole block with erasure coding. That means ordinary nodes use less bandwidth and storage, and rollups can post more data cheaply. In practice, Vitalik’s comment means the team will move carefully, increasing blob capacity slowly while testing because the idea is new and must be safe.

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Why Fusaka PeerDAS is trending today

This came out now because it is near mainnet planning in the roadmap and teams are finishing tests. Public threads from core devs and a visible note from Vitalik act like a flag for the media and builders to report as they hit it fast. Also, many projects that run on Layer-2s want the capacity gains it promises, so any comment sparks attention across social and news outlets.

What “Fusaka Will Fix This” Really Means For Users

When Vitalik says “Fusaka will fix this,” the update aims to lower fees and let rollups publish lots more data without making every node store that data. For users, that should mean lower Layer-2 fees and smoother apps — but only after careful testing and staged increases in blob limits.

How PeerDAS works

This means each node asks a few peers for random chunks of a block. If more than half the chunks are available, nodes can trust the block and use erasure coding to rebuild missing pieces. This lowers storage and bandwidth needs for normal nodes and lets the chain accept many more data “blobs” per block over time.

Reactions Across The Ecosystem

• Developers: See as an elegant technical tool, but they want long tests and audits.

• Rollup teams: They welcome more blob capacity because calldata costs fall.

• Node operators: Lighter storage and bandwidth is good, but they will watch security metrics before upgrading.

• Everyday users: Benefits may take months; expect gradual improvements, not instant miracles.

Past Upgrades That Led Here

The new update follows earlier upgrades like Pectra and a long roadmap to scale Ethereum. Over months, researchers proposed PeerDAS (EIP-7594) and testnets started to try sampling. Vitalik’s post ties these past steps to today’s planning and signals to the community that the idea now has high-level support with safety warnings attached.

Final Thoughts

Vitalik’s post is a cautious green light: this new version could unlock much more cheap capacity for Layer-2s, but developers must raise blob counts slowly and test hard. If tests pass, Fusaka PeerDAS may change how Ethereum scales; if not, the team will slow the rollout. Either way, this is an important moment for the network.