The $17.4 billion Grayscale Bitcoin Trust rallied the most since July 2021 after a US court ruling potentially paved the way for the vehicle to convert into an exchange-traded fund.Shares in the world’s largest Bitcoin portfolio jumped 17% on Tuesday, narrowing their discount to the value of the fund’s underlying token holdings to about 18% compared with a December shortfall of nearly 50%.Grayscale Bitcoin Trust (ticker: GBTC) currently has a closed-end structure, leaving it prone to big deviations from its net asset value, or NAV. Becoming an ETF...