Base is about to make its blocks ten times faster. The bill goes to whoever has to read them.
Denim, live on Base's Sepolia testnet since Oct. 21, moves Base from one block every two seconds to five every second. That's 43,200 blocks a day becoming 432,000. Base's latest node release sets mainnet activation for Nov. 5 at 18:00 UTC.
Flashblocks, the preconfirmation feed that's made Base feel fast since 2025, gets retired. Apps built on it have to move to the standard block and RPC streams before the switch, and indexers and data services are looking at roughly 10x the RPC calls.
Users get faster confirmations. Indexers get ten times the homework, on the same deadline.
Source: Crypto Briefing