The reward system for USDD Mining has just been upgraded, shifting from the previous pure USDD rewards to a dual currency reward model of USDD + TRX (7% USDD paired with 3% TRX). At first glance, it seems like just a slight adjustment in the reward composition, but it reveals deep thinking about building a "value closed loop" within the TRON ecosystem. By allowing users to receive both stablecoins and ecological tokens, it maintains the attractiveness of USDD while enhancing users' willingness to hold TRX, creating a flow of value within the ecosystem. This design establishes a closer alignment of interests between users participating in mining and the entire ecosystem, allowing both sides to benefit.