What Owner Permission Means on TRON
Owner permission is the top layer of control on a TRON account — whoever holds it can decide who's allowed to do anything else with that account.
What it controls
The Owner permission governs the account's most sensitive capability: the ability to change its own permission structure, including reassigning Active permission, adding or removing keys, and adjusting thresholds. It also covers the highest-privilege account operations.
The default state
Unless explicitly changed, every TRON account's Owner permission is a single key — its own address — with a threshold of 1. This is implicit; it doesn't show up as an explicit field until you've actually modified it.
Why it's the key thing to check
Because Owner permission controls who can change everything else, it's the single most important thing to verify before trusting that you're the true controller of an account — especially one you didn't generate yourself.