Key compromise
KuCoin Hot Wallet Compromise, September 2020: What Happened & What to Check
Roughly $281m left KuCoin hot wallets. A large share was recovered through token contract upgrades and freezes by issuers.
Key compromise
Key compromise
Coincheck NEM Theft, January 2018: What Happened & What to Check
Roughly 523 million NEM was taken from a Coincheck hot wallet held without multi-signature protection. The incident reshaped Japanese exchange supervision.
Exchange failure
Mt. Gox Collapse, February 2014: What Happened & What to Check
The largest bitcoin exchange of its era halted withdrawals and filed for bankruptcy protection, reporting roughly 850,000 BTC missing.