I think this would be an excellent movie regarding the history of BTC and its mystery founder on how everything came to be.
Haha. Really gonna be overwhelming entertainment regarding the subject of the movie. However, we shouldn't expect to see the untold factors about Satoshi's journeys to how bitcoin mysteriously became a reality project. Though an overview of it essence could be overemphasized while the white paper documentaries plays the roadmap to direct the show.
The problem, however, is on how cryptocurrencies would be portrayed given that the government views BTC both as a boon and a bane. I somehow doubt if they would allow to have it created as a movie but I would be interested if it did.
That's another food for thought because not every governments likes the decentralized ideal of the technology but still, government approval may not be a problem but depends the region that the filmmaking will take place if it's a crypto friendly place or not. Perhaps the unfriendly crypto regions where crypto related services or events are prohibited can only ban the movie not to cross their border.
For the actors, since you mentioned about it OP, well that’s debatable given that “Satoshi” is a Japanese name. But in reality, it really might be just a screen name and his identity could be another race.
It's all unproven speculations about Satoshi place of origin, so anyone country can play the part. Someone already suggested that the actors should mask up and I think it's a nice suggestion too.