P2P Gold Trading Cryptography (UDIA) is a cryptocurrency digital gold trading ecosystem based on blockchain technology, serving as an intermediary to activate online transactions. UDIA can be used as a currency in the P2P online gold trading market, with its value linked to UDG. The UDIA cryptocurrency represents gold, and the price of UDIA holds value estimated concurrently with the trading price in the gold market and the price of UDG at the time of trading 1 gram of gold.