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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.

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