USDD is a stablecoin issued by the TRON DAO Reserve, pegged to the US dollar to maintain steady value for electronic payments and to bridge the digital and traditional assets gap. The cryptocurrency's stability and security are ensured by over-collateralization with major digital assets like BTC, USDT, and TRX, with a collateral ratio always above 120% of the circulating USDD, adjusted responsively according to market conditions. Founded by H.E. Justin Sun in 2017, TRON DAO created USDD as a tool to increase transaction scale and hedge against the price volatility of cryptocurrencies, thereby promoting its use in both blockchain and real-world economies.