China has been tightening its regulations on cryptocurrencies. A recent move has been its ban on financial institutions, including banks and online payment channels, from providing services related to cryptocurrency transactions. What does China's crackdown mean for crypto in the country? Why has China tightened its regulations on cryptocurrency? How might China's ban affect the world cryptocurrency market? Tsai Wei-Tek, a blockchain expert and a professor from Beihang University, shares his views.