Even if you did not sell any of your GBTC, you still need to report the GBTC transactions that appear on your 1099-B. GBTC issued a Grantor Trust Tax document, a link to that document is below, and it explains the process you need to use in order to determine whether you have a gain or loss. As explained in the Grantor Trust Tax document, a pro rata share of each shareholder's bitcoin was sold to cover Trust expenses.
Here is a summary of the steps outlined in the Grantor Trust Tax document. While that document is lengthy--it is 17 pages--scroll to page 15 to review the steps to follow.
Step 1: Identify the shareholder’s pro rata ownership of Bitcoin.
Step 2: Calculate the Bitcoin paid out from Shareholder XYZ’s account during 2022 to pay expenses
Step 3: Calculate Shareholder’s cost basis in Bitcoin paid out from Shareholder’s account
Step 4: Calculate Shareholder’s gain or loss on Bitcoin payout for each lot purchased
Step 5: Calculate Shareholder’s investment expenses
Step 6: Calculate Shareholder’s Adjusted Bitcoin Held and Cost Basis
2022 GBTC Trust Tax Information
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