Mt. Gox Hacker

Mt. Gox “hacker”: who was it?

The identity of the person(s) who stole bitcoin from the Mt. Gox exchange was long unknown publicly; the incident is generally treated as a multi-year theft that began in 2011 and was revealed when Mt. Gox collapsed in February 2014. (en.wikipedia.org)

U.S. criminal charges (most specific public attribution)

On June 9, 2023, the U.S. Department of Justice (DOJ) unsealed charges alleging that two Russian nationals—Alexey Bilyuchenko and Aleksandr Verner—(together with co-conspirators) hacked Mt. Gox by gaining unauthorized access around September 2011 to a server holding wallet data/private keys, and then caused the theft of approximately 647,000 bitcoins from September 2011 through at least May 2014, followed by alleged laundering activity. (justice.gov)

• Alexey Bilyuchenko — charged (allegedly involved in the Mt. Gox hack and laundering; also alleged to have conspired to operate BTC-e). (justice.gov)
• Aleksandr Verner — charged (allegedly involved in the Mt. Gox hack and laundering). (justice.gov)

The DOJ emphasized that these are allegations in indictments, and that defendants are presumed innocent unless proven guilty. (justice.gov)

Related figure sometimes mentioned (not typically described as “the hacker”)

Alexander Vinnik has been accused (in earlier U.S. cases) primarily in connection with BTC-e and alleged laundering of funds tied to Mt. Gox, rather than being identified as the person who carried out the intrusion itself. (justice.gov)

If you tell me whether you mean the 2011–2014 theft broadly or a specific Mt. Gox incident/date, I can tailor the answer to that event.