Are all of the interviews in the trailer original? I got the feeling that several of them were interviews I saw many years ago, though I could be wrong.
Not sure though but since its a documentary they might clip some old videos that could be helpful with their "show".
They don't have other source but to use old clips to help them create certain mind blowing documentary that can attract their viewers. But OG's is really doubting and questioned the legitimacy of their claims since many people has not convince on what they are trying to show there.
I remember this documentary before titled
I am Satoshi https://www.youtube.com/watch?v=fc8-mvbwzUo hopefully HBO will not create another fictitious or pure speculation documentary.
But let see October 8 released seems pretty much interesting.