KIENG KESSARA, the founder of ZPool, noted that, ZPool was formerly known as Megabigpower Bitcoin mine, which was built in September 2017 in Idaho, the United States. It now only serves ZCash, a digital currency. ZCash is an encrypted currency that realized complete privacy protection by using the zero-knowledge proof (zk-SNARKS). For individuals, privacy is a rigid demand; enterprises, on the other hand, propose more demanding requirements for privacy protection in the block chain. Therefore, privacy protection is one of the most important and the most difficult directions of the technical pursuit related to block chain. In addition, through totaling 21 million, ZCash only had about 5.5 million circulating in the market—high rarity. With respect to investment, ZCash is the most valuable digital currency; moreover, compared with BTC and ETH, it boasts less difficult to compute power and higher return.