I spent hours on this because of GreyScale (GBTC) accounting. I finally saw a note on a back page of my Americatrade 1099. It basically said to get the basis, if not provided, multiply your adjusted cost basis (cost in my case) of the investment by the cost basis allocation factor. I had no way to get the value of the asset for each stupid date, so I used my original investment amount Not exact but it seemed to work. The whole process was a total wast of my time. The sale of Bitcoin to pay internal expenses should involve the investor to this extent.
GLD has a similar problem.
