BTC China, one of the countrys leading digital currency exchanges, has installed Chinas first bitcoin ATM and launched an online app allowing individuals to buy and sell bitcoins using mobile phones, skirting local banking regulations seen as increasingly hostile to so-called crypto-currencies. But a subsequent crackdown by the Peoples Bank of China (PBOC) has seen the digital currency sag, changing hands below $530 on Wednesday, according to exchange-tracker CoinDesk.