How do I report non-mortgage widely held fixed investment trust activity?

[cmower]

I have an investment partnership return that invested in Grayscale Bitcoin Trust, which appears to be a Commodity Trust (Widely Held Fixed Investment Investment Trust).  The partnership received a Combined 1099, with additional information not furnished to the IRS, but reprting the proceeds and cost basis factor of expenses.  I'm able to calculate the gain/loss, etc, but I'm having trouble determining how to report the information and/or what to do with it.  Information for taxpayer treatment seems limited and conflicting.  Some information says to adjust the basis by the gain/loss, but not to report a gain or loss on the return. If I do that, what is the other side of the entry to prevent my return from being out of balance?  It doesn't seem like I should just reduce partner equity.  Other information says to report the difference between the proceeds and the portion of cost basis as a gain and goes on to say to reduce the basis after the sale for the basis of the amount sold.  That treatment will also put me out of balance. If I'm paying tax on the gain, wouldn't I be increasing the basis by that gain?  I also read that these gains are subject to the higher LT capital gain rate of 28% instead of the normal 15% rate.  Does anyone have any knowledge of how to treat this activity and, if so, can you PLEASE share?