DMM Bitcoin

What happened

On 31 May 2024 DMM Bitcoin, a Japanese exchange registered with the Financial Services Agency, reported an unauthorised outflow of 4,502.9 BTC — worth roughly $300m at the time and one of the largest thefts in the country's history. The company said it would procure the equivalent bitcoin with support from the wider DMM group so that customer holdings were fully covered, and Japan's FSA issued a business improvement order. In December 2024 US and Japanese agencies publicly attributed the theft to North Korea-linked actors, and DMM announced it would cease its crypto business and transfer customer accounts to SBI VC Trade.

What to take from it

Registration and a solvent parent decided how this ended, not whether it happened. Japan's regime is among the strictest anywhere and the coins still left; what the rules and the group balance sheet bought was that customers were repaid rather than queued as creditors. Read a licence as a statement about who absorbs the loss, never as a claim that the loss is prevented — and note that the exchange itself did not survive being made whole.

Dates and figures are widely reported public estimates from coverage at the time, not KripZen's own audited data.