When did ETH blob upgrade activate?

TLDR

Ethereums latest blob parameter upgrade (BPO?2) activated on 7 Jan 2026 (UTC), increasing data capacity for rollups and lowering L2 fees per a market update. See the finance summary.

1. BPO?2 raised the blob target to 14%%CKPROTECTED2%% and the maximum to 21%%CKPROTECTED4%% per block, improving throughput for L2s per an exchange notice.
2. A preview earlier in the week flagged BPO?1 live and BPO?2 coming, highlighting blob?capacity increases to reduce L2 costs in January 2026 per a week-ahead note.

Deep Dive

1. Activation Date

BPO?2, the second Blob Parameter Only hard fork, went live on 7 Jan 2026. The change continues Ethereums scaling path by expanding blob capacity, which is the data lane that rollups use to publish batches efficiently. The date and context are corroborated in a macro/crypto outlook.

2. Capacity Change

The upgrade increased the networks blob target to 14%%CKPROTECTED2%% and maximum to 21%%CKPROTECTED4%% per block, an incremental tuning that improves data availability for L2s like Arbitrum and ethereum/">Optimism. This parameter shift was confirmed in an exchange notice.

3. Roadmap Context

The weeks events included communication that BPO?1 was already live and BPO?2 would follow in January, signaling a staged approach to raising blob capacity and reducing L2 costs per a week-ahead note. These parameter?only changes complement earlier upgrades that introduced blobs and continue Ethereums modular scaling trajectory.

Conclusion

The ETH blob upgrade discussed this week refers to BPO?2, which activated on 7 Jan 2026 and raised per?block blob capacity to improve L2 economics. This is part of ongoing incremental tuning of blob parameters that aims to make rollup transactions cheaper and the network more scalable overall.

Confidence: moderate because blob upgrade can mean earlier introductions of blobs; this answer focuses on this weeks activation confirmed in the notices above.