BlackRock CEO Larry Fink has expressed a strong belief in Bitcoin, describing himself as a 'big believer' in the cryptocurrency. He predicts that Bitcoin could reach a value between $500,000 and $700,000, a potential 5x increase from current prices. Fink's bullish outlook is based on the potential for sovereign wealth funds to allocate 2-5% of their portfolios to Bitcoin, which could significantly drive up its price.