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Fair Value of Bitcoin - Summary of Changes in Quantity of Bitcoin and the Respective Fair Value (Detail)
$ in Thousands
 2 Months Ended 3 Months Ended 5 Months Ended
Sep. 30, 2024
USD ($)
Bitcoin
Dec. 31, 2024
USD ($)
Bitcoin
Dec. 31, 2024
USD ($)
Bitcoin
Fair Value Disclosures [Abstract]      
Investment Owned, Beginning balance | Bitcoin 0   0
Bitcoin contributed | Bitcoin     16,606.04896843
Bitcoin contributed from Initial Distribution | Bitcoin [1]     26,935.83753443
Bitcoin redeemed | Bitcoin     (5,507.21831323)
Bitcoin distributed for Sponsor's Fee, related party | Bitcoin     (21.75689015)
Net change in unrealized appreciation on investment in Bitcoin | Bitcoin     0
Net realized gain on investment in Bitcoin sold to pay expenses | Bitcoin     0
Net realized gain on investment in Bitcoin sold for redemption of Shares | Bitcoin     0
Investment Owned, Ending balance | Bitcoin   38,012.91129948 38,012.91129948
Investment Owned, Beginning balance | $ $ 0   $ 0
Bitcoin contributed | $     1,275,420
Bitcoin contributed from Initial Distribution | $ [1]     1,756,821
Bitcoin redeemed | $     (460,574)
Bitcoin distributed for Sponsor's Fee, related party | $     (1,637)
Net change in unrealized appreciation on investment in Bitcoin | $ (31,309) $ 920,386 889,077 [2],[3]
Net realized gain on investment in Bitcoin sold to pay expenses | $ (35) 239 204 [2],[3]
Net realized gain on investment in Bitcoin sold for redemption of Shares | $ $ (3,289) 94,012 90,723 [2],[3]
Investment Owned, Ending Balance | $ [4],[5]   $ 3,550,034 $ 3,550,034
[1] Represents the impact of the Initial Distribution of 26,935.83753443 Bitcoin, with a value of approximately $1,756.8 million from Grayscale Bitcoin Trust ETF, completed on July 31, 2024, as discussed in Note 4.
[2] No comparative financial statements have been provided as the Trust’s operations commenced on July 31, 2024. Prior to the commencement of operations on July 31, 2024, the Sponsor redeemed the initial seed capital of 10,000 shares for $100,000.
[3] No comparative financial statements have been provided as the Trust’s operations commenced on July 31, 2024. Prior to the commencement of operations on July 31, 2024, the Sponsor redeemed the initial seed capital of 10,000 shares for $100,000.
[4] No comparative financial statements have been provided as the Trust’s operations commenced on July 31, 2024. Prior to the commencement of operations on July 31, 2024, the Sponsor redeemed the initial seed capital of 10,000 shares for $100,000.
[5] No comparative financial statements have been provided as the Trust’s operations commenced on July 31, 2024. Prior to the commencement of operations on July 31, 2024, the Sponsor redeemed the initial seed capital of 10,000 shares for $100,000.