I would imagine a more Hollywood-esque approach.
Bankrobber 1 & 2, both wearing Guy Fawkes mask & suit. Bankrobber 1 keeping the people at the bank in check, Bankrobber 2 sitting at a laptop, copying files onto an USB stick that looks like an AM Block Errupter:
Bankrobber 1: "Hurry up man, we gotta go!"
Bankrobber 2: "I still have to download the Blockchain... 4 days of transactions to go... 3 days... 2 days..."
Bankrobber 1: "Screw the blockchain!!! Just grab all the private keys you can and dismount the miner!"
Bankrobber 2: "1 day... DONE!"
Bankrobber 1: "GO GO GO"
Bankrobber 1 & 2 head for the escape vehicle, cut.
Also, one of the bankrobbers is Brad Pitt, the other some underdog newcomer.
Oh God, this shit sounds brilliant. Maybe in 2025, when Bitcoin is popular, this movie idea might actually be worth something at Hollywood