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docs: set Denim Base Sepolia date to October 21 - #2157
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Set the confirmed Base Sepolia activation schedule and preserve the exact UTC time while leaving Mainnet status unchanged.
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✅ Heimdall Review Status
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Docs reviewRisk: Low (one AI review) ·
Verdict: Needs rework · reviewed The changes update Denim’s Base Sepolia rollout information across the upgrade pages. The Sepolia status in the Denim overview now conflicts with the schedule wording on the Upgrades overview and migration page; align the status before publishing. Blocking
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youssefea
previously approved these changes
Oct 20, 2026
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
cb-heimdall
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youssefea’s stale review
October 20, 2026 18:01
Approved review 5589167219 from youssefea is now dismissed due to new commit. Re-request for approval.
roethke
reviewed
Oct 20, 2026
| 200ms native blocks are live on [Vibenet](/build-on-base/test-on-vibenet) for experimental developer testing. This deployment may change, and you should not rely on it for production decisions. | ||
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| Denim is not active on Base Sepolia or Base Mainnet; activation times and required client versions remain undecided. | ||
| Denim is scheduled to activate on Base Sepolia on October 21, 2026 at 18:00 UTC. The Base Mainnet activation date and required client versions are not confirmed yet. |
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Mainnet is slated for activation on Nov 5 (1800 UTC) with client version to come later
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
roethke
approved these changes
Oct 20, 2026
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What changed? Why?
Sets Denim's Base Sepolia date-set status to
Shippingand records the confirmed activation at October 21, 2026, 18:00 UTC. The exact Base Mainnet activation date and required client versions remain unconfirmed.Inventory: 14 files mention Denim; 3 edited; 11 left as is.
docs/upgrades/overview.mdx: marks Base Sepolia as targeting the confirmed activation date and time.docs/upgrades/denim/overview.mdx: sets Sepolia toShippingwith the confirmed date.docs/upgrades/denim/migrate-from-flashblocks.mdx: states the Sepolia schedule while keeping the exact Mainnet activation date and required client versions unconfirmed.Notes to reviewers
docs/upgrades/denim/200ms-blocks.mdx: Vibenet status and production-availability notes are unchanged for this date-set stage.docs/specifications/b20/changelog.mdx: Denim remainsUpcominguntilmainnet-live.docs/specifications/flashblocks.mdxanddocs/base-chain/api-reference/flashblocks-api/flashblocks-api-overview.mdx: pre-fork Flashblocks deprecation warnings remain unchanged.docs/build-on-base/run-a-local-devnet.mdx: local devnet activation settings are not rollout status.docs/build-on-base/test-on-vibenet.mdx: Vibenet testing information remains unchanged.docs/llms.txtanddocs/llms-full.txt: no date-set status wording needed updating.How has it been tested?
node scripts/validate-docs-structure.jspassed.git diff --checkpassed.Screenshots
Text-only status changes; see the affected docs URLs below.
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