Optimism - OP Mainnet: scheduled 200 ms subblocks enablement – Maintenance details

All systems operational

OP Mainnet: scheduled 200 ms subblocks enablement

Completed
Scheduled for August 31, 2026 at 6:00 PM – 8:16 PMUTC

Affects

Mainnet

Under maintenance from 6:00 PM to 8:16 PM

Transaction Sequencing

Under maintenance from 6:00 PM to 8:16 PM

Updates
  • Completed
    August 31, 2026 at 8:16 PMUTC
    Completed
    August 31, 2026 at 8:16 PMUTC
    Maintenance has completed successfully.
  • Planned
    August 31, 2026 at 6:15 PMUTC
    Planned
    August 31, 2026 at 6:15 PMUTC

    We are performing scheduled maintenance on the OP Mainnet sequencer infrastructure to transition sequencer leadership to a new set of sequencers. As part of this transition, OP Mainnet will move from 250ms flashblock production to 200ms subblock production.
    No service disruption is expected: block production should continue uninterrupted throughout the transition. This maintenance window is precautionary, and we will confirm once the transition is complete.

  • In progress
    August 31, 2026 at 6:00 PMUTC
    In progress
    August 31, 2026 at 6:00 PMUTC
    Maintenance is now in progress