https://www.ft.com/content/9e787670-6aa7-4479-934f-f4a9fedf4829 “How’s this for a disruptive technology,” a user wrote on July 11 2010, enthusiastically describing a decentralised, peer-to-peer digital currency with no central bank, no transaction fees and beyond the reach of any government. Using computers to solve cryptographic puzzles would earn people “bitcoins”.