Base Deploys Cobalt Upgrade with Validity Transactions and B20 Enhancements

Coinbase's Layer 2 network, Base, has launched its Cobalt upgrade on mainnet, introducing Validity Transactions and new B20 token standard features. Validity Transactions allow traders to set specific conditions for transaction execution, keeping them private until criteria are met. The B20 enhancements include Composite Policies for flexible whitelist/blacklist logic, Schedule Multiplier Updates for corporate actions, and seizeWithMemo for authorized balance reallocation with on-chain records.