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At a glance
- What changed
- Base's Denim upgrade, which brings native 200ms blocks, has a mainnet date of 5 November after running on the Sepolia testnet since 21 October.
- Who it affects
- Developers and node operators on Base most of all; everyday Base users should simply see faster confirmations.
- When
- Announced on 29 October 2026; mainnet expected on 5 November 2026.
What Base announced
Base now has a date for Denim on mainnet. Base Build, the developer account of the Base network, posted on 29 October 2026 that Denim is live on Base Sepolia, the test network, "with Mainnet coming November 5". Base's main account quoted it shortly after with "Denim is coming".
Until now the only public timing was "November 2026". When we covered the upgrade on 23 October, Base's documentation gave that month as a planning target, and the documentation pages still showed it that way when we checked them on 29 October.
What Denim changes
Denim is the upgrade that brings native 200ms blocks to Base. According to Base's documentation, the network goes from one block every two seconds to five full blocks per second. It also adds BaseTime for onchain millisecond time, millisecond timestamps in RPC responses, and changes to B20 transfers and policies. On Sepolia it has been running since 21 October at 18:00 UTC.
What it means for users and builders
For people who simply send USDC or use apps on Base, the visible effect should be confirmations that arrive faster. Developers have more to check: Base's documentation says block numbers advance ten times faster, so anything that measures time in blocks, such as timelocks, needs reviewing. The documentation also says the node software versions needed for mainnet had not been published yet, and calls the mainnet date a target that can change, not a fixed activation time.
Our take
A firm date is useful mainly for builders, who now have about a week to test on Sepolia and update node software once it is released. Everyday users do not need to do anything. If you want to try Base apps as Denim lands, the Base app is linked on this page.
Dates to know
As announced by the provider. A listed date does not confirm current availability or eligibility.
- Denim activates on Base SepoliaDate passed
- Denim expected on Base mainnetUpcoming date
BaseDiscount code
10% off eligible swap fees
Base referral code: 2ZTS468P. Sign up with this code to get 10% off eligible swap fees.
Affiliate link. We may earn a commission, at no extra cost to you.
Conditions
New wallets only; enter the code during onboarding. Same-chain swaps and regional eligibility rules apply.
The code and partner link have no expiry. Campaign dates, benefits and eligibility are separate and may change. Check the provider’s current terms before signing up.
