Coinbase IPO coming on this year might be a way to play this unless you want to buy the underlying. Van Eck is hopefully introducing an ETF later on this year. Today the premium swung very hard and whoever is making the market for GBTC is the worst thief going. The stock closed 3 bucks off the early morning high with the underlying asset higher at the close. Limit orders don't work all the time I have had orders to buy and sell run through my price both up and down numerous times not by a few cents either. There is more than enough liquidity in the stock for this not to happen unless the stock is being gamed.