TLDR
Ethereum (ETH) Fusaka activation is scheduled for 3 Dec 2025 around 9:49 pm (UTC) at slot 13,164,544 per an upgrade notice and media confirmations u.today.
- In UTC+8, the same activation aligns to 4 Dec 2025 at 5:49 am, consistent with the slot timing exchange notice.
- Core feature PeerDAS is part of Fusaka and aims to lower rollup data costs and improve scalability market report.
- Node operators were reminded that Fusaka client defaults set gas limit to 60 million (update or remove manual overrides) developer advisory.
Deep Dive
1. Timing and Slot
The activation target is slot 13,164,544, expected at approximately 9:49 pm (UTC) on 3 Dec 2025. Several outlets cite the slot and window as agreed by Ethereum core contributors upgrade countdown.
- Multiple reports place mainnet activation in early December with the slot timing confirming the exact hour in UTC market coverage.
- Developer calls summarized it as the next major step after recent upgrades, locking in early December for mainnet analysis.
If you track network readiness, the slot gives a precise window to expect rollup and client changes to go live.
2. Timezone View
The same slot translates to 5:49 am on 4 Dec (UTC+8), which matches public scheduling posts referencing local Asia timing for the upgrade window exchange notice.
- Using the slot-based estimate, the UTC to UTC+8 conversion lines up with public summaries of the activation moment exchange notice above.
If you operate in UTC+8, plan for early-morning activation on 4 Dec; otherwise default to 3 Dec evening (UTC).
3. PeerDAS Impact
Fusakas headline feature is Peer Data Availability Sampling (PeerDAS), which lets nodes sample blob data rather than downloading it all, reducing bandwidth and improving rollup economics market report.
- Media and developer summaries highlight cheaper, more scalable rollups and blob lanes for data, lowering L2 costs and easing mainnet congestion analysis.
- A node-ops advisory also noted client defaults (60 million gas limit), signaling operational tweaks alongside data availability changes developer advisory.
Expect L2s to benefit first (lower data costs and more throughput), with downstream effects on user fees and app performance on Ethereum.
Conclusion
Fusaka is set for mainnet activation on 3 Dec 2025 (UTC) with a slot-defined window, delivering PeerDAS to cut rollup data overhead and improve scalability. Near-term effects should center on L2 cost reductions and smoother network throughput, with operational updates (like gas limit defaults) reinforcing readiness for the change.
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