What changed after Ethereum Fusaka upgrade?

TLDR

Ethereum (ETH) activated the Fusaka upgrade on 3 Dec 2025, introducing PeerDAS data sampling, higher capacity, and fee tweaks to make rollups cheaper and nodes lighter to run activation details.

1. PeerDAS enables up to 8x more rollup data throughput and cuts node bandwidth needs, improving decentralization and L2 costs overview.
2. Capacity rose via a 60 million gas limit and blob-parameter-only forks for flexible scaling without full hard forks capacity changes.
3. A blob fee floor (EIP-7918) stabilizes L2 data costs and strengthens ETH burn linkage, improving value capture over time fee floor.

Deep Dive

1. PeerDAS Sampling

PeerDAS lets validators verify small, random samples of rollup blob data instead of downloading entire blobs. This reduces hardware and bandwidth while lifting data throughput for L2s.

1. PeerDAS is the headline of EIP-7594 and preserves decentralization by avoiding data?center requirements for home stakers explainer.
2. Guides estimate as much as 8x more rollup data capacity over time as the ecosystem tunes parameters impact summary.

2. Capacity and Configurability

Fusaka increases block capacity now and makes future scaling simpler to deploy.

1. The block gas limit rose to 60 million, allowing more computation and data per block when demand surges technical detail.
2. Blob-parameter-only forks let developers raise blob capacity without a full hard fork, enabling safe, staged increases that protect node accessibility mechanism.
3. Developers signaled the full benefits will appear over months as blob throughput is increased cautiously after a stable deployment rollout cadence.

3. Economics and UX Tweaks

Fusaka aligns fees, adds cryptography for smoother wallets, and keeps issuance unchanged.

1. A minimum blob base fee (EIP-7918) prevents near-zero blob pricing in quiet periods, stabilizing L2 data costs and making ETH burn more consistent with usage economic change.
2. Native P?256 signature support opens the door to passkey-style logins, improving mainstream wallet UX without changing balances or contracts UX feature.
3. No direct changes to ETH issuance or staking rewards, though higher activity can lift total fees and burns over time token model note.
4. Post-upgrade network performance has been stable, with client teams synchronized on the biannual cadence post-fork status.

Conclusion

Fusaka is a foundational scaling step, not an instant speed boost. PeerDAS and configurable blob capacity target cheaper, higher?throughput rollups while keeping nodes accessible. The economic tweaks and UX primitives improve value capture and usability over time. The visible effects should build gradually as parameters are raised and L2s adjust their pipelines.