Ethereum co-founder Vitalik Buterin has identified Peer Data Availability Sampling (PeerDAS) as a critical component of the upcoming Fusaka upgrade, scheduled for a mainnet launch in December 2025. This system is designed to address Ethereum's growing data bloat, with current blob storage demands exceeding 70GB and potentially reaching 1.2TB if unaddressed.
Buterin emphasized that PeerDAS will enhance data availability and throughput by distributing storage responsibilities across nodes, preventing any single node from bearing the full load. "The way PeerDAS works is that each node only asks for a small number of 'chunks', as a way of probabilistically verifying that more than 50% of chunks are available," he explained. The rollout will be phased, with the first fork on December 17, 2025, increasing blob targets from 6/9 to 10/15, followed by a second fork on January 7, 2026, raising limits to 14/21.
This security-first approach mirrors the success of Proto-Danksharding and aims to lower transaction fees, improve Layer-2 protocol performance, and sustain Ethereum's scalability. The upgrade has prompted cautious optimism among analysts, noting its potential impact on ETH and ERC-20 tokens by boosting network efficiency.