EIP-4844
EIP-4844 (March 2024) gave Ethereum a cheap lane for rollup data: instead of posting expensive calldata, rollups attach binary blobs that live ~18 days — l
EIP-4844 (March 2024) gave Ethereum a cheap lane for rollup data: instead of posting expensive calldata, rollups attach binary blobs that live ~18 days — long enough to verify, then pruned. Rollup fees fell ~10x overnight.
How it works
Each block reserves room for several blobs at a separate fee market from normal gas. Rollups post compressed batches there; Ethereum consensus guarantees short-term availability; verifiers and bridges check within the window. After expiry, history survives only in archives and indexers — availability, not permanence, is what’s guaranteed.
Why it matters for decentralization
Cheap data keeps rollups settling on Ethereum instead of drifting to centralized committees — the economic gravity holding the modular stack together. It also previews full danksharding: scaling the base layer without raising validator requirements into datacenter territory.
Risks & trade-offs
Blob space is finite, so demand spikes still price out small rollups; expiry means permanent history depends on third-party archivers; and cheaper L2 fees re-centralize activity onto a few dominant sequencers.
FAQ
Did EIP-4844 lower my wallet fees? Barely — it cut L2 data costs, not L1 execution. Your MetaMask swap on mainnet costs the same; your Arbitrum swap got much cheaper.
Are blobs permanent? No — pruned after ~18 days by design. Anyone needing eternal history must archive independently.
What comes after 4844? Full danksharding: many more blobs per block plus data-availability sampling, so light clients can verify availability without downloading everything.