Combined Statement of Changes in Net Assets - USD ($)		3 Months Ended	6 Months Ended
		Sep. 30, 2024	Sep. 30, 2024
Net assets, beginning of period	[1]	$ 373,054,934	$ 341,901,105
Net investment loss	[1]	(123,285)	(123,285)
Net realized gain (loss) on investment in bitcoin	[1]	(1,325,741)	(1,156,994)
Net change in unrealized appreciation (depreciation) on investment in bitcoin	[1]	4,121,057	(32,337,968)
Net increase (decrease) in net assets resulting from operations	[1]	2,672,031	(33,618,247)
Increase (decrease) in net assets from capital share transactions:
Contributions for Shares issued	[1]	107,983,445	209,726,374
Distributions for Shares redeemed	[1]	(31,419,769)	(65,718,591)
Net increase in net assets resulting from capital share transactions	[1]	76,563,676	144,007,783
Net assets, end of period	[1]	452,290,641	452,290,641
Franklin Bitcoin ETF [Member]
Net assets, beginning of period	[1]	373,054,934	341,901,105
Net investment loss	[1]	(123,285)	(123,285)
Net realized gain (loss) on investment in bitcoin	[1]	(1,325,741)	(1,156,994)
Net change in unrealized appreciation (depreciation) on investment in bitcoin	[1]	4,121,057	(32,337,968)
Net increase (decrease) in net assets resulting from operations	[1]	2,672,031	(33,618,247)
Increase (decrease) in net assets from capital share transactions:
Contributions for Shares issued	[1]	107,983,445	209,726,374
Distributions for Shares redeemed	[1]	(31,419,769)	(65,718,591)
Net increase in net assets resulting from capital share transactions	[1]	76,563,676	144,007,783
Net assets, end of period	[1]	$ 452,290,641	$ 452,290,641

[1] No comparative period presented as the Fund’s operations commenced on January 11, 2024.