Combined Statements of Changes in Net Assets - USD ($)		3 Months Ended
		Jun. 30, 2025	Jun. 30, 2024
Net assets, beginning of period		$ 410,857,343	$ 341,901,105
Net investment loss		(237,309)	0
Net realized gain (loss) on investment in bitcoin		9,019,211	168,747
Net change in unrealized appreciation (depreciation) on investment in bitcoin		119,518,907	(36,459,025)
Net increase (decrease) in net assets resulting from operations		128,300,809	(36,290,278)
Increase (decrease) in net assets from capital share transactions:
Contributions for Shares issued	[1]	55,501,643	101,742,929
Distributions for Shares redeemed		(35,230,580)	(34,298,822)
Net increase (decrease) in net assets resulting from capital share transactions		20,271,063	67,444,107
Net assets, end of period		559,429,215	373,054,934
Franklin Bitcoin ETF [Member]
Net assets, beginning of period		410,857,343	341,901,105
Net investment loss		(237,309)	0
Net realized gain (loss) on investment in bitcoin		9,019,211	168,747
Net change in unrealized appreciation (depreciation) on investment in bitcoin		119,518,907	(36,459,025)
Net increase (decrease) in net assets resulting from operations		128,300,809	(36,290,278)
Increase (decrease) in net assets from capital share transactions:
Contributions for Shares issued	[2]	55,501,643	101,742,929
Distributions for Shares redeemed		(35,230,580)	(34,298,822)
Net increase (decrease) in net assets resulting from capital share transactions		20,271,063	67,444,107
Net assets, end of period		$ 559,429,215	$ 373,054,934

[1] Dollar amount of balance represents the cumulative fair value of creation of shares less the redemption of shares, at the time of the specific creation or redemption.

[2] Dollar amount of balance represents the cumulative fair value of creation of shares less the redemption of shares, at the time of the specific creation or redemption.