Gold Appreciation Token (SAR-ASI) is a digital asset token issued by SAR Digital Asset Exchange entrusted by SAR Precious Metals Exchange based on blockchain technology. It is mainly used in the field of digital asset circulation and traditional payment, and it is also a dividend equity certificate corresponding to the income of physical projects at a given time. SAR-ASI is guaranteed by a total of 50 billion euros of gold stored in UBS in Switzerland, and uses the real-time price of gold on the Shanghai Precious Metals Exchange in China as the price anchor. It has constant value, system security, convenient transactions, and wide circulation.