https://www.theguardian.com/technology/2018/jan/16/bitcoin-ethereum-south-korea-fears-regulatory-crackdown-cryptocurrency-markets

Bitcoin hits a four-week low before rebounding on Tuesday as South Korean statements send cryptocurrency markets yo-yoing

The price of bitcoin was sent plummeting 18% as it and other cryptocurrencies yo-yo in value over fears of a wider trading crackdown spurred by renewed potential of South Korean regulatory action.