Fair Value of Bitcoin - Schedule of Changes in Quantity of Bitcoin and Fair Value (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026 USD ($) Bitcoin	Mar. 31, 2025 USD ($) Bitcoin	Dec. 31, 2025 USD ($) Bitcoin
Fair Value Disclosures [Abstract]
Beginning balance \| Bitcoin	38,468.0468	40,289.1335	40,289.1335
Purchases \| Bitcoin	5,943.6428		21,837.2036
In-Kind Creations \| Bitcoin	1,021.2405		124.9948
Sales for the redemption of Shares \| Bitcoin	(7,502.415)		(23,701.7104)
In-kind redemptions \| Bitcoin	(309.5802)
Bitcoin transferred for Sponsor Fee \| Bitcoin	(20.2255)		(81.5747)
Ending balance \| Bitcoin	37,600.7094		38,468.0468
Beginning balance	$ 3,367,647	$ 3,762,723	$ 3,762,723
Purchases	489,551		2,290,437
In-kind creations	69,010		10,884
Sales for the redemption of Shares	$ (586,928)		(2,351,927)
In-kind redemptions \| Bitcoin	(20,958)
Bitcoin transferred for Sponsor Fee	$ (1,605)		(8,220)
Net realized gain (loss) on In-Kind Redemptions of bitcoin	8,810
Net realized gain (loss) on investment in bitcoin transferred to pay Sponsor Fee	812	1,151	5,019
Net realized gain (loss) on investment in bitcoin sold for redemptions	(31,390)	23,850	(42,062)
Change in unrealized appreciation (depreciation) on investment in bitcoin	(745,422)	$ (476,361)	(299,207)
Ending balance	$ 2,549,527		$ 3,367,647