Base deploys Denim upgrade for faster block production on mainnet

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Base Denim mainnet upgrade

Highlights

Base deployed the Denim upgrade on mainnet, now producing a canonical block every 200 milliseconds, significantly increasing block frequency to five per second.
Denim replaces Flashblocks, introduces BaseTime with millisecond Unix timestamps, and adds new RPC fields, enabling faster and more precise on-chain state and time management for trading and payments.
New compliance features in Denim enhance B20 token controls with reusable NOT policies, transfer restrictions, and self-action blocks, building on previous upgrades Azul, Beryl, and Cobalt.

Mainnet changes and technical rollout

As reported by The Block, Base said in a statement shared on Thursday that Denim is now live on mainnet, with the Coinbase-incubated Layer 2 producing a full canonical block every 200 milliseconds, or five per second.

The upgrade replaces Flashblocks and changes how the pending block tag works, which Base said makes block production simpler, more consistent, and more reliable. Each block now follows its parent exactly 200 milliseconds later, with the protocol enforcing the interval instead of relying on the sequencer's clock.

Applications that previously relied on Flashblocks must migrate to standard canonical block subscriptions. Base also said Denim introduces BaseTime, giving smart contracts access to Unix timestamps in milliseconds, while Ethereum-compatible block.timestamp remains at whole-second resolution.

New RPC fields now provide millisecond timestamps for blocks, transactions, and logs. In the statement, Base said trading, financing, and payments require a chain that updates state frequently and lets developers reason about time with greater precision.

Compliance features and upgrade path

Denim also adds new token control features for projects using the B20 standard. These include reusable compliance policies through a NOT operator, broader transfer-executor restrictions for direct transfers, and blocks on transfers, mints, and seizures sent to a token contract's own address.

The rollout follows Azul, Beryl, and Cobalt, which are Base's first three independent upgrades since the network's 2023 launch. Azul introduced a new client stack and multiproof system, Beryl added the B20 token standard, and Cobalt brought conditional transactions and broader B20 compliance features.

Menara Asia’s Menarabena digital construction procurement platform, which we previously covered, aims to connect contractors with building material suppliers while centralising certification, technical documentation, and compliance information. The piece highlighted how the initiative is positioned to improve supply-chain efficiency and help industry players meet quality and regulatory requirements without replacing existing approvals or certifications.

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