Ethereum's PeerDAS Upgrade Marks Its First Year, Layer 2 Fees Down More Than 95%

Ethereum co-founder Vitalik Buterin posted on X on September 26, 2026, that PeerDAS has been running for nearly a year with basically no problems. He called it an underappreciated triumph of Ethereum's client developers.

PeerDAS, formally EIP-7594, launched as the headline feature of Ethereum's Fusaka hard fork on December 3, 2025, according to Crypto Briefing. Roughly ten months later it's still standing.

What It Actually Does

PeerDAS lets validators confirm that block data exists without downloading the entire block. According to Crypto Briefing, each node only checks roughly one-eighth of the extended dataset. If enough randomly sampled pieces come back intact, the network treats the data as available, even though no single participant holds the whole thing.

The mechanism relies on erasure coding similar to Reed-Solomon, splitting blob data into 128 columns distributed across gossip subnets. Each node subscribes to about eight columns. That keeps the workload light enough that validators don't need upgraded hardware to participate, per Crypto Briefing's reporting.

Buterin's framing, repeated across his September 26 post and picked up by outlets including ChainCatcher, Phemex, and TechFlow, is that this is the first large-scale blockchain system to achieve consensus on data availability without any single node downloading the complete block. He called it decentralized consensus without replication. Those four outlets are all describing the same tweet, not four independent confirmations of the claim, so it's worth treating Buterin's characterization as his own assessment rather than an independently verified industry consensus.

The Fee Numbers

The practical payoff shows up in Layer 2 transaction costs. Crypto Briefing reports that before PeerDAS activated, L2 users were paying between $0.20 and $0.50 per transaction. By the first quarter of 2026, that range had compressed to $0.005 to $0.02, a drop of more than 95%.

That didn't happen in a vacuum. PeerDAS builds on Ethereum's earlier EIP-4844 upgrade from early 2024, which first separated blob fees from execution gas fees. PeerDAS's contribution is scale. It lets far more blob data move through the network without dumping a proportional storage burden on every validator.

The blob capacity numbers back that up. At Fusaka's launch the target sat at six to nine blobs per block. Six days later, on December 9, 2025, the target climbed to 10. Less than a month after that, on January 7, 2026, it hit 14, according to Crypto Briefing. More blob capacity per block is the direct mechanical driver behind cheaper L2 transactions, since blob space is what Layer 2 networks pay for to post their data.

The Skeptical Read

Not everyone reacted to Buterin's post as a straightforward win. A user posting as booe.eth on X argued that the phrase "decentralized consensus without replication" is doing a lot of heavy lifting, suggesting the branding may be running ahead of how thoroughly that framing has been tested against edge cases or adversarial conditions. This raises a legitimate question for a system that's only had about ten months of live mainnet history, the kind of claim that's inherently hard to fully verify until it's been stress-tested by a real attack or a real outage, not just a period of quiet operation.

A stable stretch without incident matters. Ethereum's developer community ran extensive testing across hundreds of nodes on a dedicated devnet before mainnet activation, according to Crypto Briefing, and the fee reductions are measurable and consistent with the mechanism working as designed.

What's Left Unverified

What none of the current sources establish is independent, third-party technical auditing of PeerDAS's security assumptions under adversarial network conditions, as opposed to normal operation. Buterin's statement is a co-founder's assessment of his own protocol's client developers, not a neutral third-party audit. The claim of running for "nearly a year with basically no problems" is his characterization. No incident database, bug bounty report, or independent security firm's review is cited in the source material reviewed here. Whether that changes as Ethereum pushes blob targets even higher, and whether the fee gains hold up if Layer 2 usage spikes sharply, remains to be seen.