On March 23rd, USR, a stablecoin under Resolv, suffered a major security incident where attackers used leaked private keys to mint approximately $80 million in uncollateralized tokens, causing USR's price to collapse to $0.27, a decline exceeding 70%. Resolv has suspended smart contracts and destroyed 9 million abnormal tokens, with 71 million uncollateralized USR still in circulation. This incident reflects the fragility of stablecoins in terms of security and transparency, with market trust facing challenges.