Ethereum has just completed the Fusaka upgrade, a hard fork designed to prepare the network for larger-scale and more cost-effective use. Although technical on paper, the change affects the core functions of Ethereum — how data is stored, how transactions fit into blocks, and how Rollups like Arbitrum, Base, and Optimism interact with the main chain.
For any ETH investor, this upgrade lays the foundation for lower fees, better network efficiency, and a more resilient long-term ecosystem.
A larger network with more space to grow
The biggest change occurred in how Ethereum handles data.
Each transaction, NFT mint, DeFi swap, or Layer-2 batch requires block space, and until now, that space was limited. Fusaka increases Ethereum's capacity so that blocks can carry more information at once.
Missed the Fusaka network upgrade?
13 Ethereum Improvement Proposals (EIPs) are now live on Mainnet.
Here’s Fusaka in 35 seconds. pic.twitter.com/DlUh1ATA55
— Ethereum (@ethereum) December 4, 2025
This doesn’t make the chain instantly faster, but it reduces pressure when demand increases, such as during market volatility or popular token launches.
In simple terms, Ethereum can absorb more activity without difficulties.
Cheaper rollups through expanded blob capacity
A large part of Ethereum's traffic today comes from Rollups. These networks bundle thousands of user transactions and settle them on Ethereum as compressed data called 'blobs'.
Before Fusaka, the space for blobs was restricted. When demand increased, fees went up. Fusaka expands the available space for blob submissions and introduces a flexible system to increase or decrease capacity without a complete upgrade.
As rollups expand into this new space, users should experience lower transaction costs and smoother application activity.
The end goal is simple: more transactions, less friction.
PeerDAS: a simpler way to verify data
Another significant improvement is how Ethereum nodes verify data. Previously, nodes needed to download large sections of block data to confirm that nothing was missing or hidden.
Fusaka introduces PeerDAS, a system that verifies small random pieces of data instead of the full load.
It works like inspecting a warehouse by opening a few random boxes instead of checking each one.
PeerDAS in Fusaka is significant because it literally is sharding.
Ethereum is coming to consensus on blocks without requiring any single node to see more than a tiny fraction of the data. And this is robust to 51% attacks – it's client-side probabilistic verification, not… pic.twitter.com/OK81xBteER
— vitalik.eth (@VitalikButerin) December 3, 2025
This reduces the bandwidth and storage needs for validators and node operators, making it easier — and cheaper — for more people to run infrastructure.
A broader base of validators strengthens decentralization, which ultimately reinforces the security and resilience of Ethereum.
Greater block capacity means more throughput
In addition to increasing scaling capacity, Fusaka also raises the gas limit of blocks. A higher limit means that more work can fit into each block, allowing more transactions and smart contract calls without delays.
This does not increase block speed, but expands throughput. DeFi activity, NFT auctions, and high-frequency trading will have more space during peak hours.
Better wallet support and future improvements in user experience
Fusaka also includes improvements in crypto and the Ethereum virtual machine. The upgrade adds support for P-256 signatures, used in modern authentication systems, including those behind passwordless login on smartphones and biometric devices.
This paves the way for future wallets that work more like Apple Pay or Google Passkeys instead of seed-phrase-based apps. Over time, this could make access to Ethereum simpler for regular users.
Ethereum is about to 10x the wallet UX.
The Fusaka upgrade includes EIP-7951 – support for the signature scheme that the iPhones use to power things like Face ID.
Meaning you'll soon be able to sign transactions with your face.
Huge win for bringing normal people on-chain. pic.twitter.com/7Ad38m4Oxz
— Jarrod Watts (@jarrodwatts) November 27, 2025
What Fusaka means for ETH investors
The impact for ETH investors is gradual but relevant. Fees on Layer-2 networks should decrease as data capacity expands. Network congestion should become less common. More validators can participate due to lower hardware requirements.
More importantly, Ethereum now has room to grow without sacrificing security or decentralization. If adoption increases, the settlement volume grows alongside — and so does the role of ETH as the asset that fuels, protects, and settles everything that happens on it.
$ETH is still consolidating around the $3,000 level.
Not much price action due to weekends, but next week could be interesting.
QT is ending on December 1st, Powell's speech is on December 1st, and the Fusaka upgrade is coming on December 3rd.
If Ethereum holds above the… pic.twitter.com/pxgmrOHyah
— Ted (@TedPillows) November 30, 2025
A fundamental, non-flashy update
Fusaka does not rewrite the Ethereum economy or make ETH suddenly deflationary, but it strengthens the foundation upon which future demand depends. Cheaper rollup fees invite usage.
A more scalable base layer invites developers. A more accessible node environment invites participation. These are structural improvements, the kind that have little impact on a day, but transform the network over time.
Ethereum widened the road, improved the toll system, and made it easier for new drivers to enter. That’s the real meaning of Fusaka — a silent change with long-term weight.
As Layer-2 networks expand and applications multiply, the effects should move from technical discussion to user experience, transaction cost, and ultimately, the value of ETH itself.
The article What really changed with the Fusaka upgrade of Ethereum? was first seen in BeInCrypto Brazil.
