https://www.reuters.com/article/us-china-bitcoin-btcc/bitcoin-exchange-btcchina-says-to-stop-trading-sparking-further-slide-idUSKCN1BP1J8 >Chinese bitcoin exchange BTCChina said on Thursday that it would stop all trading from Sept. 30, setting off a further slide in the value of the cryptocurrency that left it over 30 percent away from the record highs it hit earlier in the month.