Massive Cryptocurrency Heist: Japan’s DMM Bitcoin Loses Over $300 Million

Digital vault being hacked with binary code and cryptocurrency symbols, illustrating a massive cryptocurrency heist.

Japan’s cryptocurrency exchange DMM Bitcoin has reported a significant security breach resulting in the loss of over $300 million worth of bitcoin. The incident, described as an "unauthorized leak," has led to the suspension of several services as the company investigates the breach.

Key Takeaways

  • DMM Bitcoin lost 4,502.9 bitcoin, valued at approximately $308 million.
  • The company has restricted some services and is investigating the incident.
  • Customers’ lost bitcoin deposits will be replaced with the help of other group companies.
  • Japan’s Financial Services Agency has demanded an investigation.
  • This incident is one of the largest crypto thefts in history.

The Incident

On Friday, DMM Bitcoin announced that it had detected an unauthorized leak of bitcoin from its wallet at approximately 1:26 p.m. The exchange reported that 4,502.9 bitcoin, worth roughly $306 million, had been stolen. The company has not provided details on how the assets were stolen or whether an outside party was involved.

Immediate Actions

In response to the breach, DMM Bitcoin has frozen most of its services, including deposits, withdrawals, and the trade of almost all cryptocurrencies. The company assured its clients that their bitcoin deposits would be fully reimbursed, stating, "Please rest assured that all of your bitcoin deposits will be fully guaranteed, as we will procure the equivalent amount of BTC that was leaked with support from our group companies."

Regulatory Response

Japan’s Financial Services Agency has demanded that DMM Bitcoin investigate the incident thoroughly. The agency’s involvement underscores the severity of the breach and the need for stringent security measures in the cryptocurrency industry.

Historical Context

This incident is one of the largest crypto thefts in history. If confirmed as theft, it would rank as the eighth largest crypto theft of all time. The largest theft occurred in November 2022, when FTX lost $477 million. The region’s largest theft was in 2018, when $530 million worth of cryptocurrency was stolen from the Japanese exchange Coincheck.

Industry Impact

Cryptocurrency companies are frequent targets for hacks and cyberattacks, although losses of this scale are rare. In 2023 alone, around $1.7 billion was stolen from various cryptocurrency platforms. The DMM Bitcoin breach highlights the ongoing challenges and risks associated with securing digital assets.


The DMM Bitcoin breach serves as a stark reminder of the vulnerabilities in the cryptocurrency industry. As the company works to investigate and rectify the situation, the incident underscores the importance of robust security measures and regulatory oversight to protect investors and maintain trust in digital financial systems.



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