Bitcoin's price fell below the $100,000 mark, reaching a low of $99,973.01, with a 24-hour decline of 2.84%. This drop comes amid macroeconomic uncertainties and potential U.S. government shutdown risks. Despite the downturn, Tether increased its Bitcoin holdings by 961 BTC, valued at approximately $97.3 million, indicating continued institutional confidence in Bitcoin as a reserve asset. In other developments, privacy coins like Zcash (ZEC) surged 20% in 24 hours, with a monthly increase of over tenfold, while Monero (XMR) rose by 5.42%. Meanwhile, the DeFi sector faced challenges as the Balancer protocol suffered a flash loan attack, causing the USDX stablecoin to depeg to $0.40, highlighting ongoing security vulnerabilities in decentralized finance.