On Dec. 27, 2018, the bitcoin wallet Electrum notified users about a phishing attack that was targeting users through malicious servers. At that point, the alleged hacker(s) had already stolen more than 245 BTC.
The Crystal analytics platform engineering team completed an in-depth analysis of the movement of bitcoin from the Bithumb exchange after its hack in June 2018. The attack resulted in the loss of $31 million, with 2,016 BTC lost.
The Crystal analytics platform engineering team tracked the movement of bitcoin from the Zaif exchange after its hack in September 2018. On September 18, the exchange reported to the police that it had been hacked.