Grayscale Investments (which, like CoinDesk, is owned by Digital Currency Group) already offers the $2 billion Grayscale Bitcoin Trust (GBTC) that trades on U.S. exchanges like a stock. But it’s a trust, and existing shares cannot be redeemed to help balance supply and demand, helping to explain why it has, since early last year, traded at a discount to the total value of its bitcoin holdings.