The hacker, who told WIRED his name is "Jeffrey," claims to have also obtained information on Nakamoto that could be used to unmask his identity. Jeffrey didn't tell us much, but when we asked him how he managed to take control over the firstname.lastname@example.org email address that Nakamoto had used for some of his correspondence, he wrote: "The fool used a primary gmx under his full name and had aliases set up underneath it. He's also alive."
In a Pastebin post, Jeffrey said he will release Satoshi's secrets if someone pays 25 bitcoins—about $12,000 to his bitcoin address. He says he has email messages dating back to 2011. A programmer (or group of programmers) going by the name Satoshi Nakamoto released the open source software that drives the bitcoin digital currency in 2009. Ever since, as bitcoin has expanded into a worldwide phenomenon, people have tried to unmask its creator, but his true identity has never been sufficiently proven.