Denim represents Base's fourth major upgrade on mainnet, following the Azul, Beryl, and Cobalt upgrades

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Denim reduces Base's canonical block generation time tenfold from two seconds to 200 milliseconds, producing five canonical blocks per second

Denim updates Base's B20 token standard by adding a NOT operator for policy inversion and extending transfer-executor restrictions to direct token transfers

Base, the Coinbase-incubated Ethereum layer 2 network, activated its Denim upgrade on mainnet at 18:00 UTC on Thursday, November 5, 2026

Base block No. 53,556,127 was the network's first 200-millisecond block produced after the Denim upgrade activation

Base node operators were required to upgrade to base/base v1.5.1 or later to support the Denim upgrade

Base said Denim blocks B20 token mints, transfers, and seizures targeted at a token contract's own address to prevent permanent asset locking

Denim officially retires Flashblocks on Base, requiring applications using Flashblocks or the pending block tag to migrate to canonical RPC streams

Flashblocks had operated on Base since July 2025 to stream partial transaction preconfirmations every 200 milliseconds between two-second blocks

On-chain data from Bitquery showed attackers drained approximately $391,000 from BitMart wallets across the Base, Arbitrum, and Optimism Ethereum layer-2 networks on November 2, 2026

The Aztec Tierra upgrade implements soft transaction finality checkpointed to Ethereum within 6 to 12 seconds

The Aztec Tierra protocol upgrade reduces zero-knowledge proving time across the network by approximately 50 percent

The Security Council temporarily modified Arbitrum's Inbox contract using a function called sendUnsignedTransactionOverride to process transactions as if sent by the Binance exploiter's address, before restoring the original contract code

Arbitrum's Security Council initiated the transfer of Binance exploit funds by calling the UpgradeExecutor contract through its Safe wallet in Ethereum block 26301886

Arbitrum's Security Council is a 12-member body elected by ARB token holders that requires nine signers to execute emergency protocol updates

Steven Goldfeder, co-founder and CEO of Offchain Labs, stated in July 2026 that Arbitrum's emergency powers belong to an external, broadly elected council rather than individual developers

Arbitrum's Security Council previously used its emergency powers in April 2026 to transfer over 30,765 ETH from an address held by the KelpDAO exploiter on Arbitrum One

The Ethereum improvement proposal EIP-7702 added a delegation feature enabling standard Ethereum accounts to behave like smart contracts

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The Ethereum Foundation delayed deployment of the Glamsterdam hard fork on the Hoodi testnet because of security concerns that EIP-8037 could weaken defenses in existing mainnet contracts

EIP-8038 aims to increase Ethereum's transaction capacity by aligning gas charges more closely with the resources smart contracts consume.

The Hoodi testnet postponement also suspends the planned activations of both the Amsterdam execution layer and the Gloas consensus layer on the network.