what's DMM Bitcoin?

DMM Bitcoin was a Japanese cryptocurrency exchange operated by DMM.com Securities, a subsidiary of the DMM Group. Registered with Japan's Financial Services Agency, it offered spot and leverage trading for Bitcoin and select altcoins, along with wallet services and accumulation plans for retail users. The platform emphasized user-friendly interfaces and competitive fees tailored to the Japanese market. In May 2024, DMM Bitcoin suffered a significant security breach where approximately 4,502 BTC (valued at ~$305M) was stolen from a hot wallet via unauthorized access, attributed to North Korean actors by FBI/Chainalysis. The incident led to full compensation of users via loans/bonds, suspension of services, and eventual shutdown in March 2025, with accounts and assets transferred to SBI VC Trade.

DMM Bitcoin suffered a $305 million hack in May 2024.