Optimism proposes Upgrade 16 bridge and guardian changes

What happened

Optimism published Superchain Upgrade 16 for review and extended its bug-bounty scope to the proposed upgrade calldata before production deployment.

What changed

The proposal would update OptimismPortal for future cross-chain messaging, remove DeputyGuardianModule, update DeputyPauseModule, and raise the maximum gas limit from 200 million to 500 million.

What did not change

The notice states that Upgrade 16 does not enable Superchain interoperability, and it does not establish that the proposed payload was approved or executed.

Confirmed

• Upgrade 16 was the first proposed upgrade covered by the expanded calldata bug bounty.
• The proposed OptimismPortal changes are preparatory and do not turn on interoperability.
• The proposal includes removal of DeputyGuardianModule and updates to DeputyPauseModule.
• The maximum gas limit would increase from 200 million to 500 million.

Still open

• The final governance outcome and executed payload.
• The deployed guardian and pause-module state after any execution.
• Whether the final code or calldata changes during security review.

What it means for an advisor

• Review the Optimism bridge memo's upgrade, pause, and guardian control map before treating Upgrade 16 as operative.
• Verify the final governance payload and deployed contract state after execution; the expanded bounty does not establish safety or approval.