How the BigONE hack happened

What was the BigONE $27 million hack?

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.

Interestingly, BigONE has reported that no private keys were leaked during the exploit. Instead,…