What is Fusaka?
On Dec. 3, 2025, Ethereum will activate the Fusaka upgrade on mainnet, its second major hard fork of the year after Pectra in May.
Rollups now carry the bulk of Ethereum transactions and fee revenue, yet they are still constrained by how much data they can post back to the layer 1 and what it costs.
Fusaka is designed to relieve that pressure. Its headline feature, PeerDAS (peer data availability sampling), lets validators verify rollup blob data without downloading…
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