Quarterly Statements of Operations - Schedule of Quarterly Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Expenses:
Sponsor's Fee, related party	$ 449	$ 646	$ 1,109	$ 1,126	$ 1,442	$ 860	$ 330	$ 150	$ 3,330	$ 2,782	$ 118
Net investment loss	(449)	(646)	(1,109)	(1,126)	(1,442)	(860)	(330)	(150)	(3,330)	(2,782)	(118)
Net realized and unrealized (loss) gain from:
Net realized (loss) gain on investment in BCH	(280)	(80)	363	395	782	279	(355)	(85)	398	621	(201)
Net change in unrealized (depreciation) appreciation on investment in BCH	(86,668)	(13,699)	(24,547)	(7,531)	(1,964)	43,931	24,357	(6,783)	(132,445)	59,541	(3,255)
Net realized and unrealized (loss) gain on investment	(86,948)	(13,779)	(24,184)	(7,136)	(1,182)	44,210	24,002	(6,868)	(132,047)	60,162	(3,416)
Net (decrease) increase in net assets resulting from operations	$ (87,397)	$ (14,425)	$ (25,293)	$ (8,262)	$ (2,624)	$ 43,350	$ 23,672	$ (7,018)	$ (135,377)	$ 57,380	$ (3,534)