A lot has changed since our last Coinmama weekly cryptocurrency roundup. Bitcoin’s price dropped from $4,200 all the way to a low of $2,970 on September 15 as China’s central authorities cracked down on bitcoin exchanges. After four Chinese bitcoin exchanges announced closing operations, the price per BTC regained some energy the same day, and bounced back to the $3,800 mark. At press time, bitcoin is hovering around the $4,000 per BTC price range. This mid-September bitcoin price drop affected alternative digital currencies, as well as Ethereum markets dropped to a low of $300 per ETH.