Incident All ledgers
Ooki: $55.0m
Ooki lost $55.0m on 5 November 2021. Ranked 68th of 1,272 crypto failures, with method, returned funds and comparable incidents.
- Date
- 5 November 2021
- Lost
- $55.0m
- Returned or repaid
- None recorded
- Target
- DeFi Protocol
- Category
- Social Engineering
- Method
- Phishing
- Chains
- Polygon, BSC
In November 2021, an unidentified attacker phished a bZx protocol developer with a malware-laced Word document, obtained a private key, and drained about $55 million from Ooki (bZx) on Polygon and BSC.
Against the ledger
- It ranks 68th of the 1,272 incidents with a known loss, and 16th in 2021.
- It accounts for 46.1% of the $119.3m in known losses in November 2021.
- 61 incidents in the ledger are classified as Social Engineering, for $3.12bn in total. This one is 1.8% of that.
- The ledger records no returned funds.
Other incidents named Ooki
| Date | Target | Lost | Type | Method | Returned |
|---|---|---|---|---|---|
| 18 Feb 2020 | Ooki | $650,000 | DeFi Protocol | Spot Price Manipulation | — |
| 15 Feb 2020 | Ooki | $350,000 | DeFi Protocol | Spot Price Manipulation | — |
Closest in size by the same method
| Date | Target | Lost | Type | Method | Returned |
|---|---|---|---|---|---|
| 18 Jun 2025 | Nobitex | $82.0m | CEX | Malware | — |
| 19 Apr 2021 | EasyFi | $59.0m | DeFi Protocol | Malware | — |
| 16 Oct 2024 | Radiant V2 | $50.0m | DeFi Protocol | Blind Signing | — |
| 22 Jul 2023 | CoinsPaid | $37.3m | Other | Impersonation Scam | — |
| 26 Nov 2025 | Upbit | $36.0m | CEX | Malware | — |
All failures in 2021 · The failures ledger
Amounts are DefiLlama’s estimates and can change as incidents are revalued. Its returned figure can include money a company repaid itself, not only funds recovered from attackers. Source: DefiLlama.
Cite this Bitminer.io, “Ooki, failures ledger”, data to 2 November 2026, https://bitminer.io/ledger/incident/ooki-2021-11-05/. How this is built