Base's third mainnet upgrade, Cobalt, is now live! It introduces Validity Transactions and several new B20 asset features. Validity Transactions let users pre-submit time-limited transactions that only execute when specific conditions are met. The B20 standard adds Composite Policies, allowing rules like KYC whitelists and sanction blacklists to be combined using AND or OR logic. Schedule Multiplier Updates enable planned adjustments to asset balance displays, such as stock splits. The new seizeWithMemo feature lets authorized admins redistribute holder balances under asset seizure mechanisms, while recording the source, destination, amount, and memo on-chain. Base also announced plans to reduce block time from 2 seconds to 200 milliseconds in the coming months, along with native protocol-level support for smart accounts, gas fee sponsorship, and transaction batching. (The Block) https://(wublock123.com)/news/base-cobalt-mainnet-upgrade-validity-transactions-b20-features-69322