Base Mainnet Launches Denim Upgrade With 200ms Block Times

Denim's shift from Flashblocks preconfirmations to native 200ms blocks is a structural change, not just a speed bump: each block now carries its own hash, state root and receipts, which matters for how applications and infrastructure treat finality and confirmations. The B20 changes are the more consequential piece for RWA issuers, since transfer-agent approval and switchable whitelist/blacklist address lists bring compliance controls closer to the token standard itself. Whether native sub-second blocks become the baseline other chains respond to, and how issuers actually use the new B20 controls, are the open questions worth watching.