South Korea has removed anonymity in cryptocurrency.

https://finance.yahoo.com/news/south-korea-ban-cryptocurrency-traders-using-anonymous-bank-020713849--sector.html

Bitcoin prices are falling again because of the removal of anonymity in cryptocurrency prior to the G20 summit.

We did mention that the removal of anonymity would cause the bitcoin prices to fall.

http://sg-stock.blogspot.sg/2018/01/cryptocurrencies-have-crashed-but-have.html