Base’s Cobalt upgrade adds another rule to affect token balances
Summary
Base’s Cobalt upgrade, scheduled for Sept. 30 at 18:00 UTC, adds configurable balance seizures for B20 tokens. Issuers can set which holders are eligible, assign authorized seizure roles, pause the operation and restrict recipients. The seizeWithMemo function transfers tokens to another address while bypassing ordinary transfer policies and allowances, without changing total supply. Seizure is distinct from burning: reassignment keeps tokens in circulation, while a separate authorized burn can destroy them. The upgrade also deprecates, but retains, B20’s existing burnBlocked function. Base’s status page scheduled mainnet maintenance through 20:00 UTC, and the v1.4.2 release directs node operators to upgrade by the launch time.
