STATEMENTS OF CHANGES IN NET ASSETS - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Increase in net assets from operations:
Net investment loss	$ (959)	$ (782)	$ (984)	$ (433)	$ (3,665)	$ (2,469)	$ (934)
Net realized loss on investment in BCH	6	(86)	190	(281)	(17)	(450)	(1,946)
Net change in unrealized appreciation on investment in BCH	84,506	(18,005)	(85,186)	(19,915)	48,646	23,205	63,679
Net increase in net assets resulting from operations					44,964	20,286	60,799
Increase in net assets from capital share transactions:
Shares issued					22,983	22,716	0
Net increase in net assets resulting from capital share transactions					22,983	22,716	0
Total increase in net assets from operations and capital share transactions					67,947	43,002	60,799
Net assets:
Beginning of year		$ 135,014		$ 92,012	135,014	92,012	31,213
End of year	$ 202,961		$ 135,014		$ 202,961	$ 135,014	$ 92,012
Change in Shares outstanding:
Shares outstanding at beginning of year		40,366,000		34,812,900	40,366,000	34,812,900	34,812,900
Shares issued					6,757,300	5,553,100	0
Net increase in Shares					6,757,300	5,553,100	0
Shares outstanding at end of year	47,123,300		40,366,000		47,123,300	40,366,000	34,812,900