KuCoin

Hacked

Exchange · born 2017 · ✝ 2020

Hot wallet keys leaked, then the exchange clawed it back.

KuCoin is a major centralized crypto exchange that suffered a large breach in 2020 when its hot wallet private keys were compromised. Attackers made off with roughly $45M in assets through an unknown method.

Peak: ~$45M stolen
Cause: Hacked
Year of death: 2020

☠️ Cause of death

Hot wallet private keys were compromised by an unknown method, letting attackers sweep funds; KuCoin survived by freezing tokens with issuers and recovering much of the loss.

📓 Lessons left behind

—Hot wallet keys are the highest-value target on any exchange.
—Cold storage and tight withdrawal limits cap blast radius.
—Token-issuer cooperation can claw back centrally-controlled assets.

🌱 The idea that survived

Cold storage discipline

Reinforced that exchanges should keep the vast majority of assets in cold storage with minimal hot wallet float.

#exchange#custody#private-key#cex