By Laura Desmond You can nab a hefty cash prize if you can break into John McAfee’s Bitfi wallet. The antivirus software pioneer and self-proclaimed “crypto visionary” tweeted on Tuesday that he’ll give anyone a $100,000 bounty if they can hack his “unhackable” cryptocurrency wallet. He tweeted: ”For all you naysayers who claim that “nothing is unhackable” & who don’t believe […]