September 19, 2025: Altcoin season begins as investors shift from Bitcoin to Solana amid market volatility. HBAR drops 3%, finding support at $0.24. New SEC ETF listing standards open floodgates for crypto products with potentially uneven price impacts. Market gives back weekly gains in Friday's decline. Solana founder warns Bitcoin must address quantum computing threats by 2030. Powered by LabCat AI research tools.