[asdfbank]

That's like asking how do you convince people you dug a hole without using a shovel... who cares what tools were used unless you're in some kind of game with such rules. the shovel is just a tool and it didn't dig the hole, you did.

Lots of ideas are new to the person coming up with them, only to find out that it was invented 50 years ago, doesn't mean you cheated. AI or not, just own it.

[amichail]

Nowadays, people will not take your idea seriously if they think you used AI in any way — even if it is just to write it up after thinking of it yourself.

[JohnFen]

Maybe so, but I don't think that being deceptive is the right response to that. Even ignoring the ethics of being deceptive, if others find out about the habit then nobody will have trust in anything you write after that.