Is Altcoin Season Finally Here? Bitcoin Dominance at 58%, Altseason Index at 49, and Why This Cycle Is Different

Bitcoin dominance fell from 60% to approximately 58% in early June 2026 as Bitcoin declined sharply below $70,000. The Altcoin Season Index from Blockchain Center reads 49, up from 35 to 39 in mid-May but still 26 points below the…