All incidents · May 31, 2024
Bitcoin moved out of a DMM Bitcoin wallet
DMM BitcoinExchangeContainedBitcoin
At 1:26 p.m. on May 31, 2024 (Japan time), DMM Bitcoin said it detected an unauthorized transfer of bitcoin out of a wallet. The amount was 4,502.9 BTC, about 48.2 billion yen. The Block converted that to about $306 million. TechCrunch converted it to about $305 million. The company said that, with group support, it would make up the same amount of BTC, and that it guaranteed customers' bitcoin. This is a promise, not a completed reimbursement.
Other figures
- Loss305million USDTechCrunch's dollar conversion · as of May 31, 2024
Sequence
Newest first · UTC
Mar 82025 · Sat
The exchange later ended service, and accounts moved to SBI VC Trade
Statement · DMM Bitcoin
The DMM Bitcoin website says service ended on March 8, 2025. Customer accounts and custodied assets, in yen and crypto assets, had all been transferred to SBI VC Trade. This is a later business handover. It is not a reimbursement figure in this file.
May 312024 · Fri
4,502.9 BTC was detected moving out at 1:26 p.m.
Confirmation · DMM Bitcoin
The company's first report said that at about 1:26 p.m. on May 31, 2024, an unauthorized transfer of bitcoin was detected from the company wallet. The original text carried by Nikkei put the amount at 4,502.9 BTC, about 48.2 billion yen. The Block's English translation converted the same amount to about $306 million. TechCrunch wrote about $305 million. Both dollar figures are kept. The same statement said that all bitcoin deposited by customers would, with support from group companies, be made up in the same amount of BTC, and fully guaranteed. This is a promise. It is not recorded as a completed reimbursement. At the same time the company limited some services. Those were new-account review, crypto-asset withdrawals, spot buying (sells only), and new leveraged positions (closes only).
At approximately 1:26 p.m. on Friday, May 31, 2024, we detected an unauthorized leak of bitcoin from our wallet.