- Fusaka introduces PeerDAS to solve data availability challenges in blockchains.
- The system uses chunk-based verification and erasure coding for security.
- Safety testing remains the top priority before scaling further.
Fusaka is working on a system designed to fix one of the hardest problems in blockchain networks, data availability. Inspired by ongoing work in Ethereum, the team is not rushing. Safety remains the priority, even as the project pushes into new and untested ground.
Fusaka will fix this.
— vitalik.eth (@VitalikButerin) September 24, 2025
But also, safety first is of the utmost importance for Fusaka. The core feature, PeerDAS, is trying to do something pretty unprecedented: have a live blockchain that does not require any single node to download the full data.
The way PeerDAS works is that… https://t.co/go6QsqjaFC
The goal is to ensure that blockchains can scale without relying on each node to carry the full weight of every piece of data. The core feature, called PeerDAS, stands at the center of this effort. It introduces a live blockchain model where no single node must download all the data.
Instead, each node checks a small number of chunks from every block. These chunks act as proof. If more than half are available, the system can mathematically guarantee that the rest of the data can be recovered. This method reduces the load on each participant and makes scaling more practical.
First Version of PeerDAS Leaves Two Exceptions in Ethereum
The process behind PeerDAS is both simple and sophisticated. A node requests random chunks of data, verifies their availability, and then relies on erasure coding to rebuild the missing parts. If enough chunks exist, the block is considered valid.
Two exceptions still remain in the first version. Full data must exist during initial broadcasting, and also in rare cases when a publisher releases between half and nearly all of a block. Yet these exceptions do not break the system. They only require one honest participant, even if many others behave dishonestly.
Different nodes can also step in to handle these tasks for different blocks.
The development team expects future upgrades to reduce these exceptions further. Cell-level messaging and distributed block building could allow the process to spread across many actors. That would mean no single point carries the responsibility of keeping a block alive.
Fusaka Targets Secure Growth for Layer 2 Networks
Usaka’s developers are not rushing. They have spent years developing it and know how risky it would be to roll out such an unconventional technology full-tilt. Initial tests will maintain blob counts small.
Gradually, it will happen through increasing confidence in the design by the team. Eventually, it will act as a steppingstone for scaling. At first, it will help to grow layer 2 networks more efficiently through their advantages. Eventually, after gas limits are increased, it will get feasible to use the identical system for scaling layer 1.
This transition will be vital for processing huge volumes of transaction-related data. Fusaka is not experimenting. It’s building the next decade’s blockchain infrastructure. PeerDAS could mark the start that will finally render decentralized systems scalable and secure
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