When you launch a rollup with Arbitrum Orbit, security becomes one of those things you simply can’t overlook. A few areas need special mention:
Sequencer protection: It should be very well-protected, monitored, and resilient against downtime.
Bridge security: Orbit chains rely on bridges, so double-check upgrade paths and contract logic.

Data availability choices: Pick a DA layer you trust, this directly impacts network safety.

Access controls: If your Arbitrum Orbit Chain is permissioned, set clear roles and strong validation rules.

Upgrade governance: Improve governance by using multisigs and/or timelocks to prevent hasty/sketchy upgrades. 

Get these right, and your Orbit rollout starts on solid, secure ground.