Wawowiwowiwa!
BTC run due to Spain winning the first Winter Olympic medal after 26 years. This has driven the South Korean traders to push BTC to 9999$ during the night after such event.
Also South Korean government has announced their will to regulate the crypto exchanges, providing a license for the platforms in order to be more transparent, rather than prosecute them. This might also had an impact in the market sentiment in the last hours.