Tokyo Police Launch Investigation into Missing Mt. Gox Bitcoin

The Tokyo Police investigation will focus on 27,000 BTC suspected to have been stolen from Mt. Gox.

AccessTimeIconJul 30, 2014 at 9:46 p.m. UTC
Updated Sep 14, 2021 at 2:05 p.m. UTC
10 Years of Decentralizing the Future
May 29-31, 2024 - Austin, TexasThe biggest and most established global event for everything crypto, blockchain and Web3.Register Now

The Tokyo Metropolitan Police Department has launched an official investigation into possible illicit activity surrounding the closure of Japan-based bitcoin exchange Mt. Gox.

The news comes roughly five months after the bitcoin exchange reported it lost roughly 744,400 BTC – then about $350m in customer funds, and about one month since Mt. Gox was approved for its Chapter 15 bankruptcy in the US.

A spokesperson for the police department told The Wall Street Journal:

“We decided to launch an investigation as we concluded this case could be connected to criminal activity."

Tokyo police told the media outlet that they suspect roughly 27,000 BTC were stolen from the website.

Using past figures, however, as many as 544,000 BTC could theoretically be uncovered by the investigation, as Mt. Gox later confirmed that it found 200,000 BTC in an old bitcoin wallet in March, reducing its total estimated number of lost bitcoins.

Investigation ongoing

The news, while vague as to how police will seek to carry out their mandate, is potentially encouraging to former exchange users still waiting for any action that could help recover their lost assets.

Lawyers representing the exchange's former users and current creditors, for instance, have reported that they have been blocked from conducting any fact-finding into Mt. Gox KK, the company's Japanese entity, since it was granted initial bankruptcy protection in the US.

Still, in comments to CoinDesk, representatives of the Edelson law firm suggested that they believe that any wrongdoing was perhaps the result of activity at the exchange itself, not necessarily any outside parties. It is unclear whether the new investigation is focusing on the company or on any alleged cybercriminal activity.

Mt. Gox has officially maintained that it lost the customer funds because hackers were able to exploit bitcoin's transaction malleability – a process by which exchanges between Mt. Gox users were identified, though this claim was widely disputed by the community.

Police activity escalates

The announcement also comes amid an alleged increase in police activity related to digital currency in Japan.

For example, Japan’s Ministry of Economy, Trade and Industry first introduced a plan for how it would monitor illicit trade involving digital currency this May. This initiative would find the government agency working with other peer organisations such as the Financial Services Agency and National Police Agency.

That same month, police forces in Tokyo and Fukuoka carried out what was said to be the country's first bitcoin-related arrest, when a 38-year-old bitcoin user was arrested for allegedly importing illegal stimulants.

Tokyo skyline via Shutterstock


Please note that our privacy policy, terms of use, cookies, and do not sell my personal information has been updated.

CoinDesk is an award-winning media outlet that covers the cryptocurrency industry. Its journalists abide by a strict set of editorial policies. In November 2023, CoinDesk was acquired by the Bullish group, owner of Bullish, a regulated, digital assets exchange. The Bullish group is majority-owned by; both companies have interests in a variety of blockchain and digital asset businesses and significant holdings of digital assets, including bitcoin. CoinDesk operates as an independent subsidiary with an editorial committee to protect journalistic independence. CoinDesk employees, including journalists, may receive options in the Bullish group as part of their compensation.

Learn more about Consensus 2024, CoinDesk's longest-running and most influential event that brings together all sides of crypto, blockchain and Web3. Head to to register and buy your pass now.