Combined Statements of Operations - USD ($)		3 Months Ended		6 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Expenses
Sponsor's fee		$ 296,673	$ 192,723	$ 533,982	$ 368,406
Less waiver		0	(69,438)	0	(245,121)
Total expenses		296,673	123,285	533,982	123,285
Net investment loss		(296,673)	(123,285)	(533,982)	(123,285)
Net realized gain (loss) from bitcoin sold for the redemption of shares and sold to pay expenses		7,290,973	(1,325,741)	16,310,184	(1,156,994)
Net change in unrealized appreciation (depreciation) on investment in bitcoin		21,116,054	4,121,057	140,634,961	(32,337,968)
Net realized and change in unrealized appreciation (depreciation) on investment in bitcoin		28,407,027	2,795,316	156,945,145	(33,494,962)
Net increase (decrease) in net assets resulting from operations		$ 28,110,354	$ 2,672,031	$ 156,411,163	$ (33,618,247)
Net increase (decrease) in net assets per Share (in Dollars per share)	[1]	$ 3	$ 0.23	$ 17.23	$ (3.18)
Franklin Bitcoin ETF [Member]
Expenses
Sponsor's fee		$ 296,673	$ 192,723	$ 533,982	$ 368,406
Less waiver		0	(69,438)	0	(245,121)
Total expenses		296,673	123,285	533,982	123,285
Net investment loss		(296,673)	(123,285)	(533,982)	(123,285)
Net realized gain (loss) from bitcoin sold for the redemption of shares and sold to pay expenses		7,290,973	(1,325,741)	16,310,184	(1,156,994)
Net change in unrealized appreciation (depreciation) on investment in bitcoin		21,116,054	4,121,057	140,634,961	(32,337,968)
Net realized and change in unrealized appreciation (depreciation) on investment in bitcoin		28,407,027	2,795,316	156,945,145	(33,494,962)
Net increase (decrease) in net assets resulting from operations		$ 28,110,354	$ 2,672,031	$ 156,411,163	$ (33,618,247)
Net increase (decrease) in net assets per Share (in Dollars per share)	[1]	$ 3	$ 0.23	$ 17.23	$ (3.18)

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