Security incident · 2020-08-18
OKEx
According to the public DefiLlama incident dataset, OKEx (Ethereum Classic) suffered a security incident on 2020-08-18, with about $5.6M reported lost.
| Date | 2020-08-18 |
|---|---|
| Reported loss | $5.6M |
| Chain | Ethereum Classic |
| Target type | CEX |
| Technique class | Bridge & Cross-Chain |
| Technique | Forged Proof |
| Bridge incident | No |
| Within 2020 | #15 by loss that year, 0.1% of all reported losses that year |
How this kind of attack works
A bridge confirms on one chain and releases on another. When confirmation was bypassed, the attacker received assets on the target chain without depositing.
Would a pre-payment check have helped
Bridge mint/verification flaws happen inside the bridge and are addressed by its own security design and audits.
Other incidents with the same technique
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- Kelp2026-04-18 · $293.0M
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- Bitcoin Gold2018-05-16 · $18.0M
- pNetwork2021-10-04 · $13.0M