An employee at the exchange's wallet-infrastructure provider was social-engineered, and stolen session credentials were used to manipulate a legitimate transaction request.
~$305 to 308M. The exchange subsequently wound down.
Your custody is only as strong as every vendor in the signing path, including the ones you have never heard of.
These are the custody configurations structurally exposed to this kind of event. It describes the failure class, not any individual holder.
Whether your own arrangement sits in one of those groups is the question our Custody Independence Standard is designed to answer, and the four questions in Is your custody setup actually safe? walk through it.
FBI, DC3 and Japan NPA joint advisory
Figures are as reported by the named sources. Proof of Custody has not independently reproduced the underlying analysis.
Proof of Custody, "DMM Bitcoin" incident record, proofofcustody.io/incidents/dmm-bitcoin-2024An employee at the exchange's wallet-infrastructure provider was social-engineered, and stolen session credentials were used to manipulate a legitimate transaction request. Reported loss: 4,502.9 BTC.
Your custody is only as strong as every vendor in the signing path, including the ones you have never heard of.
This class of failure could reach: bitcoin left on an exchange. It describes the failure class rather than any individual holder.