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DMM Bitcoin
crypto exchange · JP · East Asia · DMM Bitcoin Co., Ltd.
On 31 May 2024 Japan's DMM Bitcoin lost 4,502.9 BTC in an unauthorized outflow and halted crypto withdrawals and new trading. The parent group backed customer balances and the exchange later wound down, transferring accounts to SBI VC Trade.
Original: DMM Bitcoin、482億円相当のビットコインが不正流出…流出分は全額保証、安全対策のため一部サービスを制限
- First disruption
- May 31
- First public signal
- unknown
- Acknowledged
- May 31
- Restored
- resolved, time unknown
- Duration
- not established
- DFX first recorded
- Nov 5 14:58 UTC
What was restricted
Crypto withdrawals halted; yen withdrawals delayed; new accounts, spot buys and leverage paused; exchange later closed and moved accounts to SBI VC Trade by March 2025.
Financial impact: 4,502.9 BTC (about 48.2bn yen, USD 305m to 320m), customers guaranteed by group
Cause, kept in separate layers
- What the institution said
- Unauthorized outflow ('不正流出') of 4,502.9 BTC from its wallet
- DFX classification
- Confirmed cyber (cyber: confirmed)
- Wording used
- 不正流出 (illicit outflow)