2/24/2014
🗻 Death of Mt.Gox
On February 24, 2014, Mt. Gox, the largest bitcoin exchange at the time, halted trading due to insolvency. Mt. Gox closed on February 25, 2014, and later filed for bankruptcy protection in Japan and the USA, losing 640,000 bitcoins.
Sources:
https://archive.bitcoin-calendar.org/archive/1749199434.105028/index.html#index.html
https://www.wired.com/2014/02/bitcoins-mt-gox-implodes-2/