Ethereum is scheduled to activate its Fusaka upgrade on December 3, 2025, at 21:49 UTC, deploying PeerDAS technology. This innovation enables network nodes to store only one-eighth of blob data while unlocking up to 8x theoretical scalability for Layer 2 rollups.
This marks Ethereum’s second major network enhancement in 2025, following the Pectra fork in May, which sparked a 29% rally in ETH and set new standards for validator operations.
The Fusaka hard fork merges the Osaka execution layer upgrade and Fulu consensus layer update, delivering improvements that boost Ethereum’s scalability, security, and user experience. These changes support exponentially higher transaction volumes across Layer 1 and Layer 2 solutions within Ethereum’s ecosystem.
According to Coin Metrics analysis, Fusaka enhances Layer 1 throughput by increasing blob capacity to improve data availability, resulting in much more cost-effective rollup operations. The upgrade is a direct follow-up to Pectra, which combined Prague and Electra upgrades into Ethereum’s most ambitious hard fork to date.
Ethereum’s official X announcement highlighted the upgrade’s impact on the Layer 2 ecosystem.
“Ethereum’s second major upgrade this year. Feature highlight: PeerDAS – Unlocking up to 8x data throughput. For rollups, this means cheaper blob fees and more space to grow.”
Fusaka’s scope extends to infrastructure improvements, reduced node resource requirements, and increased security through stricter computational limits and refined gas pricing mechanisms.
Peer Data Availability Sampling (PeerDAS) anchors Fusaka’s innovation, completely changing how nodes manage blob data. Under PeerDAS, nodes now store one-eighth of the network’s blob data, reducing storage demands by around 80% while maintaining full data availability via distributed sampling.
The Ethereum Foundation documentation states that PeerDAS enables nodes to verify data availability by randomly sampling small portions of data across the network. This reduces bandwidth and storage barriers for node operators, increasing participation while supporting greater overall blob capacity.
For Layer 2 rollups, which use Ethereum to post transaction data, PeerDAS directly reduces blob fees. The new scalability enables rollups to process higher transaction volumes while potentially lowering costs, directly addressing key challenges in Ethereum scaling.
Additionally, Fusaka adds Blob-Parameter-Only forks, allowing Ethereum to adjust blob capacity targets and limits without requiring a full network hard fork. This gives developers the flexibility to quickly increase blob targets in response to rollup demand without the need for major protocol upgrades.
Fusaka delivers critical security and efficiency enhancements. EIP-7918 aligns blob fees with actual network congestion, protecting Ethereum’s economic security. The upgrade also caps single transaction gas usage at 16,777,216 (2^24) gas units to eliminate denial-of-service risks from large transactions.
On the user experience front, native support for secp256r1 signatures enables passkey-style authentication using Apple Secure Enclave and Android Keystore. This eliminates the need for seed phrases, potentially accelerating institutional adoption. Sharplink CEO Joseph Charom called Fusaka “a massive milestone for Ethereum and its institutional adoption journey.”
However, analysts remain cautious about direct price comparisons. Pectra’s rally coincided with broader macro tailwinds, including a US-UK trade deal that boosted overall market sentiment. Fusaka’s impact may depend more on sustained L2 growth and institutional inflows than on immediate speculative interest.
Unlike Pectra, which focused heavily on staking efficiency and account abstraction, Fusaka prioritizes infrastructure scalability — a less visible but arguably more foundational improvement for Ethereum’s long-term competitiveness against rivals like Solana.
