China’s most powerful regulators on Friday intensified the country’s crackdown on cryptocurrency with a blanket ban on all crypto transactions and mining, hitting bitcoin and other major coins and pressuring crypto and blockchain-related stocks. Ten agencies, including the central bank as well as banking, securities and foreign exchange regulators, vowed to work together to root out “illegal” cryptocurrency activity, the first time the Beijing-based agencies have joined forces to explicitly ban all cryptocurrency-related activity.…