What Active Permission Means on TRON
Active permission is what actually authorizes the transactions you make every day — transfers, contract calls, and everything short of changing the account's own control structure.
What it controls
Active permission covers routine operations: sending TRX or tokens, interacting with smart contracts, and most of what a typical wallet user does day to day. It's deliberately separate from Owner permission so day-to-day keys don't need the same level of trust as the account's ultimate control.
The default state
Like Owner permission, an unmodified account's Active permission implicitly defaults to a single key — the account's own address — with a threshold of 1.
Why it can be reassigned independently
Because Active permission is a separate structure from Owner, it's possible — and sometimes legitimate — for an account to grant Active-level access to another key for specific operational purposes, without giving away full Owner-level control. The same mechanism, though, is exactly what a multisig scam abuses at the Owner level to lock the real owner out entirely.