Largest BTC Dump Case Study: December 2017–2018 Bitcoin all time history indexINDEX:BTCUSDFayedleonDecember 2017–2018 – ICO Bust & Global Regulatory Crackdown Drop: -83% (from ~$20,000 to ~$3,200) Catalyst: The bursting of the ICO bubble, regulatory scrutiny worldwide, mass retail capitulation, and risky leverage.