https://www.vice.com/en_us/article/pkbnq9/china-bans-bitcoin-again

The People's Bank of China posted a statement on Friday morning that said essentially all activity related to cryptocurrencies in the country, including making transactions with Bitcoin or issuing tokens, are illegal. 

China has long sought to crack down on cryptocurrencies, seemingly without complete success. The government banned banks from handling cryptocurrencies in 2013, and in 2017, the country banned exchanges. This year, the Chinese government cracked down on cryptocurrency mining, which led to a global exodus of mining firms. So, Friday's statement, which came in the form of a Q&A, can be seen as a retrenchment and expansion of a long history of trying to stamp out cryptocurrencies in China.