May 1, 2016 - Gatecoin 250 BTC, 185,000 ETH $2 million

Cordalo simplify writing Corda applications.

“We have previously communicated the fact that most clients’ crypto-asset funds are stored in multi-signature cold wallets. However, the malicious external party involved in this breach, managed to alter our system so that ETH deposit transfers by-passed the multi-sig cold storage and went directly to the hot wallet during the breach period. This means that losses of ETH funds exceed the 5% limit that we imposed on our hot wallets.” Source