Exchange record
BigONE
Centralized cryptocurrency exchange operating since 2017 that suffered an approximately USD 27 million hot-wallet and supply-chain security incident in July 2025, temporarily interrupting services before restoration and a full-compensation commitment.
Registry sequence
Key facts
URL handling
Summary
Centralized cryptocurrency exchange operating since 2017 that suffered an approximately USD 27 million hot-wallet and supply-chain security incident in July 2025, temporarily interrupting services before restoration and a full-compensation commitment.
Timeline
BigONE confirmed a roughly USD 27 million hot-wallet / supply-chain breach, while stating that private keys and cold storage remained safe and that user balances would be fully covered.
BigONE reported that a third-party supply-chain attack modified operating logic and enabled unauthorized transfers from hot wallets, with losses estimated at approximately USD 27 million.
BigONE temporarily suspended deposits while reinforcing system security after the breach, with later updates indicating deposit and trading services were restored.
BigONE reported that deposit and trading services had been restored after the incident, while withdrawals were scheduled to return after additional security reinforcement.
Reporting described BigONE as temporarily freezing or suspending trading functions after the USD 27 million security incident while working with SlowMist to trace stolen funds.