This documentary from 2015 features interviews with many well-known Bitcoin proponents as well as many other people from the world of finance to explain its revolutionary potential.
What sets it apart is the very good history of money at the beginning of the film, which demystifies the financial systems we use, and shows how they developed historically.
Apart from that it is very well edited and illustrated and evidently a lot of time and expertise went into its making.
Personally, although Bitcoin represents blockchain technology generally, I would like to see some documentaries that focused on something other than Bitcoin.
A documentary on Ethereum, or its successors would be really welcome. Or one that focused on n on-monetary uses of the blockchain.