Base Cobalt Upgrade Introduces Administrative Seizure Rules for B20 Tokens

The Base Cobalt upgrade, set for mainnet deployment on September 30 at 18:00 UTC, introduces a new administrative function called seizeWithMemo for B20 tokens. This feature allows issuers to move tokens from a holder's address to another without affecting the total supply or triggering standard transfer policies. While B20 tokens already support administrative control over roles and policies, the update enables issuers to configure seizure eligibility separately from ordinary transfer restrictions. Execution requires specific roles, an unpaused function, and a permitted recipient, with seizure disabled by default.