$27 million gone, no private keys exposed: How the BigONE hack happened
A sophisticated supply chain attack on Seychelles-based crypto exchange BigONE led to a $27 million theft from hot wallets, without exposing private keys.
The Seychelles-based cryptocurrency exchange BigONE confirmed that on July 16, 2025, it suffered a crypto supply chain attack that allowed cybercriminals to drain $27 million from the exchange’s hot wallets.
With a sophisticated attack, the hackers compromised the exchange’s production network and gained access to the funds without ever accessing private keys.