If they were serious they would crowdfund a cubesat and track it as it orbits the Earth. It was good enough evidence to prove that Sputnik was in orbit. You can

If they were serious they would crowdfund a cubesat and track it as it orbits the Earth. It was good enough evidence to prove that Sputnik was in orbit. You can even put cameras on the things so I'm sure there's all kinds of experiments you could do to verify that NASA wasn't faking it.