Vitalik Buterin, Ethereum co-founder, said that the Fusaka upgrade introduces PeerDAS sharding to scale layer-2 networks, though limitations remain on the base layer’s block building and mempool design.
“PeerDAS in Fusaka is significant because it literally is sharding,” said Buterin. “Ethereum is coming to consensus on blocks without requiring any single node to see more than a tiny fraction of the data. Sharding has been a dream for Ethereum since 2015. But even still, this is a fundamental step forward in blockchain design.”
According to Ethereum’s announcement, the Fusaka hard fork introduces Peer Data Availability Sampling (PeerDAS), a mechanism allowing nodes to verify that block data has been fully published by randomly sampling small chunks instead of downloading entire blocks. This delivers effective data sharding for blob space, significantly expanding room for rollups to post transaction data while keeping node hardware requirements manageable for ordinary operators. Fusaka is positioned on Ethereum’s roadmap as the upgrade that unlocks scalable data availability for layer-2 ecosystems and prepares the ground for future base-layer scaling once components like zkEVMs mature.
PeerDAS is designed to yield concrete quantitative gains for Ethereum scaling. By allowing validators to check only small, random slices of erasure-coded block data, bandwidth requirements per node can fall by as much as 85%, lowering the barrier to running full nodes and improving decentralization. Analysts tracking the Fusaka upgrade estimate that expanding data-blob capacity could reduce rollup transaction fees on major layer-2 networks such as Arbitrum, Optimism, and Base by roughly 40–60%, depending on network demand, while enabling quadratic growth in rollup transaction throughput thanks to data-availability sampling.
Buterin is a Canadian programmer and entrepreneur best known as the co-founder and primary conceptual architect of Ethereum, one of the world’s leading smart-contract blockchains. Born in 1994 in Russia and raised in Canada, he became active in cryptocurrency as a teenager, co-founding Bitcoin Magazine in 2011 before publishing the Ethereum white paper in 2013. The Ethereum network launched in 2015 and has since grown into a core platform for decentralized finance (DeFi), non-fungible tokens (NFTs), and other blockchain applications, helping make Buterin one of the most influential figures in digital assets. He is also noted for large philanthropic donations to scientific and humanitarian causes.
The Ethereum ecosystem is supported by the Ethereum Foundation, a Switzerland-based non-profit organization dedicated to advancing the open-source Ethereum protocol and its broader community. Rather than directly controlling the network, the foundation funds core client teams, cryptography and scalability research, grants, and educational initiatives that keep the protocol secure and decentralized while fostering innovation on top of it. The foundation describes itself as one steward among many in a global ecosystem that includes independent developers, companies, rollup teams, and validators contributing to Ethereum’s growth as a neutral programmable settlement layer for the internet.
