Bitfi’s Hardware Wallet is Terrible

It recently came to my attention that John McAfee has been advertising a cryptocurrency hardware wallet from a company called Bitfi, with the claim that it is “unhackable”. There’s even a $250,000 bounty to hack it. I do not have one of the actual devices in my possession, but from my review of the publicly available “source code” [PDF] and their private key calculator, my conclusion is that their product is most charitably described as a “footgun”.