These hedge fund billionaires sold Nvidia stock and added to their positions in the iShares Bitcoin Trust in the first quarter.Nvidia (NVDA 1.75%) shares have advanced 1,080% since January 2023 as demand for artificial intelligence (AI) infrastructure has surged. Nevertheless, the hedge fund billionaires listed below sold Nvidia in the first quarter and bought shares of the iShares Bitcoin Trust (IBIT 0.55%), a BlackRock fund that could soar in the coming years if certain Wall Street experts are correct.Ken ...