The offers that appear in this table are from partnerships from which Investopedia receives compensation. China constitutes 71 percent of the total hash rate of Bitcoin and has the five biggest mining pools in the world. BTC China is a large Chinese exchange that has been around for a long time, making them very trustworthy. However, over the last few months more miners are still being added to the network and the hashrate appears to be headed up again. We looked at the network hash rate chart at blockchain. Before the shutdown of exchanges by the government, there were a few prominent exchanges to buy Bitcoin such as Huobi and BTC China. They offer a large amount of liquidity making it quick to trade, although the exchange can be difficult to use at times.