https://www.reuters.com/article/us-china-cryptocurrency-mining/china-crypto-mining-business-hit-by-beijing-crackdown-bitcoin-tumbles-idUSKCN2D5031 >SHANGHAI (Reuters) -Cryptocurrency miners, including HashCow and BTC.TOP, have halted all or part of their China operations after Beijing intensified a crackdown on bitcoin mining and trading, hammering digital currencies amid heightened global regulatory scrutiny.