Combined Statements of Operations - USD ($)		3 Months Ended
		Jun. 30, 2025	Jun. 30, 2024
Expenses:
Sponsor's fee		$ 237,309	$ 175,683
Less waiver		0	(175,683)
Total expenses		237,309	0
Net investment loss		(237,309)	0
Net realized gain (loss) from bitcoin sold for the redemption of shares and sold to pay expenses		9,019,211	168,747
Net change in unrealized appreciation (depreciation) on investment in bitcoin		119,518,907	(36,459,025)
Net realized and change in unrealized appreciation (depreciation) on investment in bitcoin		128,538,118	(36,290,278)
Net increase (decrease) in net assets resulting from operations		$ 128,300,809	$ (36,290,278)
Net increase (decrease) in net assets per Share (in Dollars per share)	[1]	$ 14.6	$ (3.72)
Franklin Bitcoin ETF [Member]
Expenses:
Sponsor's fee		$ 237,309	$ 175,683
Less waiver		0	(175,683)
Total expenses		237,309	0
Net investment loss		(237,309)	0
Net realized gain (loss) from bitcoin sold for the redemption of shares and sold to pay expenses		9,019,211	168,747
Net change in unrealized appreciation (depreciation) on investment in bitcoin		119,518,907	(36,459,025)
Net realized and change in unrealized appreciation (depreciation) on investment in bitcoin		128,538,118	(36,290,278)
Net increase (decrease) in net assets resulting from operations		$ 128,300,809	$ (36,290,278)
Net increase (decrease) in net assets per Share (in Dollars per share)	[1]	$ 14.6	$ (3.72)

[1] Net increase (decrease) in net assets per Share based on average shares outstanding during the period.