This came out in 2016, you are a little too late to even search for it. Its just alright when it comes to information.
That's because I'm not into it before
As I said, I just searched it out of curiosity 
There are a lot better documentaries around. "Bitcoin: The End of Money As We Know It", "Life on Bitcoin" and the first documentary I watched long time ago, Rise and Rise of Bitcoin.
If you watched UNFRIENDED: THE DARK WEB it's also about bitcoin. If you haven't watch it, add it to your watch lists about cryptocurrency movies. 
Gonna add these to my to-watch list. Thank you!
Is this the one with the couple that try to live off Bitcoin only for a while? Weren't they members on here?
I made a quick search and I think you're referring to "Life on Bitcoin".