Base Network to Target 200ms Blocks in November Upgrade
Developers must migrate data feeds as the network scales to five blocks per second and RPC traffic rises 10-fold.
Updated on Oct. 27, 2026 in Remote Work
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Base network is set to launch its Denim upgrade in November 2026, targeting a 200-millisecond block time. Developers and operators must prepare for a 10-fold increase in RPC call volume as the network transitions away from its legacy Flashblocks mechanism.
Why it matters
The upgrade shifts the network from a separate preconfirmation layer to fast canonical settlement, potentially streamlining security and performance. Businesses relying on the OP Stack infrastructure face immediate integration updates to accommodate the surge in block throughput.
The network will increase block production to 432,000 daily blocks, a 10-fold jump from the current 43,200. This upgrade moves block output to five blocks per second while replacing the existing Flashblocks mechanism used since July 2025.
The players
Base
An Ethereum Layer 2 network built on the OP Stack framework designed to scale decentralized application capacity.
OP Stack
The open-source modular development framework for building Layer 2 blockchain networks.
The details
Denim optimizes performance by allowing canonical blocks to provide fast settlement directly, removing the need for the existing Flashblocks preconfirmation layer. To support this, operators running applications on the network must migrate from the legacy Flashblocks feed to the new canonical block and RPC feeds. The change aims to reduce settlement times and improve security, but it necessitates significant adjustments to how applications ingest and process network data.
Timeline
July 2025: Base began running the Flashblocks mechanism.
October 21, 2026: Denim activated on the Base Sepolia testnet.
November 2026: Denim is targeted for mainnet activation.
Market Landscape
The Denim upgrade marks a formal retirement of the July 2025 implementation of Flashblocks to achieve native sub-second settlement. This transition follows a broader industry trend of integrating preconfirmation mechanics directly into the base layer of the stack.
Operators must audit their application architecture immediately to handle a 10-fold increase in RPC call volume. Failing to update data ingestion feeds from Flashblocks to the new canonical format will likely cause service disruptions once the upgrade goes live.
The takeaway
The move to a 200-millisecond block time forces a move toward high-throughput data handling at the application layer. Monitor for the mainnet activation in November 2026 and verify that your infrastructure can support the projected tenfold increase in incoming newHeads events.
What happens next
Network operators should prepare for mainnet migration during the scheduled November 2026 rollout window.
Further reading
For broader technical shifts in distributed infrastructure, see our analysis on Remote Work.
Source note: This article includes information reported by Crypto Briefing.
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