AI Today Discoveries: 1. Federal Reserve Chairman Powell Signals Hawkish Stance, Bitcoin Drops sharply 2. Bank of Japan Signals Rate Hike, Yen Rises, Triggering Global Risk Aversion 3. New Cryptocurrency Regulatory Framework Emerges, Multiple Chinese Departments Join Forces to Crack Down Hard 4. Major Ethereum Network Upgrade Pectra Activated, Opening a New Era of Account Abstraction 5. Japan Plans to Levy Separate Tax on Cryptocurrency Trading Profits to Ease Investors' Burden