https://usdtcard.net/news/2026-08-05-asia-879ec20e/ usdtcard.net zh-CN 2026-08-05T00:00:00.000Z 美英对齐稳定币 1:1 储备资产原则：对手里那张 USDT 卡意味着什么 regulation, stablecoin, cross-border, issuer-policy