You are asked to get proof you went to the moon.
You go to the moon, take pictures, take rocks back home, get video, measurements, perform experiments. You thoroughly explain how it‘s done and televise it globally.
You are again asked for proof, despite having exhausted all means of providing proof. The onus is no longer on the party that claims to have gone to the moon.
If the claim is that the data came from a million miles away, you need to prove that I'm afraid.
What, exactly, is the problem with data coming from a million miles away? I find it perfectly understandable. Maybe instead of looking for an easily digestible single fact, consider the gestalt of spaceflight and its history. For most people, the sheer breadth and depth of the industry and its achievements is more than enough proof. For some people it’s not enough, sure. I’m sure the people actually doing shady business are happy that people are wasting their time looking into space being fake.