Japanese Exchange DMM Bitcoin Loses Over $300 Million in Cryptocurrency

Bitcoin coin breaking apart, declining graph in background, DMM Bitcoin logo, representing $300 million cryptocurrency loss.

DMM Bitcoin, a major Japanese cryptocurrency exchange, has reported a significant security breach resulting in the loss of over $300 million worth of Bitcoin. The incident, which occurred on May 30, 2024, has led to the suspension of several services on the platform as the company investigates the breach and assures users of full compensation for their losses.

Key Takeaways

  • Incident Date: May 30, 2024
  • Amount Stolen: 4,502.9 BTC (approximately $305 million)
  • Immediate Actions: Suspension of withdrawals, new account openings, and new buy orders
  • User Assurance: Full compensation for all affected users
  • Historical Context: Second-largest cryptocurrency theft in Japan, following the Coincheck hack in 2018

Details of the Breach

DMM Bitcoin detected the unauthorized access to its wallet at around 1:26 p.m. on May 30. The breach resulted in the loss of 4,502.9 BTC, valued at approximately $305 million. The company immediately suspended several services, including withdrawals, new account openings, and new buy orders, to prevent further unauthorized outflows.

Company Response

In an official statement, DMM Bitcoin assured its users that all lost Bitcoin deposits would be fully guaranteed. The company plans to procure the equivalent amount of BTC with the support of its group companies to compensate affected users. DMM Bitcoin has also implemented measures to prevent further unauthorized access and is actively investigating the details of the breach.

Historical Context

This incident marks the second-largest cryptocurrency theft in Japan, surpassed only by the 2018 Coincheck hack, which resulted in the loss of 58 billion yen worth of cryptocurrency. The Coincheck hack had extensive repercussions for the Japanese cryptocurrency industry, leading to increased scrutiny and regulatory measures.

Impact on Users

DMM Bitcoin’s immediate response to the breach includes the suspension of several services, which may cause delays in Japanese yen withdrawals. The company has advised users to stay updated through official notices and has apologized for any inconvenience caused.

Broader Implications

The DMM Bitcoin hack is a stark reminder of the ongoing security challenges faced by cryptocurrency exchanges. Despite advancements in security measures, hacks and scams continue to pose significant risks to the industry. This incident follows other notable hacks, such as the Poloniex exchange hack in November 2023 and the GDAC hack in April 2023, which resulted in losses of $100 million and $14 million, respectively.


As DMM Bitcoin works to resolve the breach and compensate its users, the incident underscores the importance of robust security measures in the cryptocurrency industry. Users are encouraged to remain vigilant and stay informed about the latest developments in exchange security.



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