flashblocks

Base has disabled Flashblocks in the Denim upgrade, switching to generating a complete standard block every 200 milliseconds. Denim was activated on Base Sepolia on October 21, 2026, at 18:00 UTC, and on the Base mainnet on November 5 at 18:00 UTC. After activation, Base stopped producing Flashblocks on both networks, and Flashblocks subscriptions, WebSocket streams, and pending states will no longer return data.The official documentation states that endpoints like wss://mainnet.flashblocks.base.org/ws will still accept connections but will no longer push any data. Developers need to replace eth_subscribe("newFlashblocks") with eth_subscribe("newHeads"), replace pendingLogs with logs, and for newFlashblockTransactions, switch to pulling transactions by standard blocks after using newHeads; RPC calls using the "pending" block tag should be changed to read the latest standard block and state.Regarding node configuration, mainnet nodes must be upgraded to base/base v1.5.1 or higher, and Sepolia nodes must be v1.5.0 or higher, while removing settings such as RETH_FB_WEBSOCKET_URL, --flashblocks-url, --max-pending-blocks-depth, and --flashblocks.ping-interval. Additionally, validity transactions with the flashblock_index predicate will be rejected, and it is recommended to use block_number to limit the range.

ChainCatcher news, according to the official announcement from Base, Base has launched several new technologies aimed at enhancing on-chain transaction speed, scalability, and user experience. Among them, the Flashblocks technology has gone live on the Base Sepolia testnet, reducing block confirmation time from 2 seconds to 200 milliseconds, making it the fastest EVM chain.In addition, Base has also introduced Base Appchains (L3 chains), providing dedicated block space for high-traffic applications to improve scalability. At the same time, Base has introduced Smart Wallet Sub Accounts to optimize user experience, reduce the number of transaction signatures, and provide a more secure account management method. Base plans to launch Flashblocks and Sub Accounts on the mainnet in Q2.

ChainCatcher news, Uniswap Labs CEO Hayden Adams posted on the X platform that Unichain is an L2 designed specifically for DeFi, with more new improvements set to be launched in the coming months and year to accelerate the scaling of the Unichain blockchain, including:Flashblocks------a block builder in collaboration with Flashbots that reduces block time from 1 second to 0.25 seconds, allowing most MEV to be returned to users and providing additional transparency and decentralization for transaction ordering/prioritization;Seamless Interoperability------in partnership with Optimism, the goal is to make Unichain a pioneer in driving the development of interoperable L2s;Unichain Verification Network------plans to continue promoting L2 decentralization through UVN, adding an extra layer of economic security and validation through staking on top of the sequencer.