QC (QuickCash, fast Money), is based on quantum chain smart contract issued stablecoin, is QuickCash Network Pte. Ltd. Initiated blockchain project. The value of QC stabilization coin is 0.15 USD (≈1RMB), which is initially locked. Users can make part of QC circulate by mortgaging digital assets, such as BTC, ETH, EOS, LTC, QTUM and other mainstream digital assets, with a mortgage ratio of more than 150%. That is, QC stable currency in circulation is the credit guarantee of excess digital asset collateral. All pledge and circulation records are publicly displayed on the blockchain, effectively preventing excess QC from entering the circulation market, so as to ensure the stable exchange rate and free circulation of QC.