Combined Statements of Cash Flows - USD ($)	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash Flows from Operating Activities:
Net increase (decrease) in net assets resulting from operations	$ 128,300,809	$ (36,290,278)
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Purchases of bitcoin	(55,501,643)	(101,742,929)
Sales of bitcoin	35,531,914	34,298,822
Net realized (gain) loss on investment in bitcoin	(9,019,211)	(168,747)
Net change in unrealized (appreciation) depreciation	(119,518,907)	36,459,025
Change in operating assets and liabilities:
Sponsor’s fees payable	(64,025)	0
Net cash provided by (used in) operating activities	(20,271,063)	(67,444,107)
Cash Flows from Financing Activities:
Proceeds from issuance of Shares	55,501,643	101,742,929
Payments on Shares redeemed	(35,230,580)	(34,298,822)
Net cash provided by (used in) financing activities	20,271,063	67,444,107
Cash
Net increase in cash	0	0
Cash, beginning of period	0	0
Cash, end of period	0	0
Franklin Bitcoin ETF [Member]
Cash Flows from Operating Activities:
Net increase (decrease) in net assets resulting from operations	128,300,809	(36,290,278)
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Purchases of bitcoin	(55,501,643)	(101,742,929)
Sales of bitcoin	35,531,914	34,298,822
Net realized (gain) loss on investment in bitcoin	(9,019,211)	(168,747)
Net change in unrealized (appreciation) depreciation	(119,518,907)	36,459,025
Change in operating assets and liabilities:
Sponsor’s fees payable	(64,025)	0
Net cash provided by (used in) operating activities	(20,271,063)	(67,444,107)
Cash Flows from Financing Activities:
Proceeds from issuance of Shares	55,501,643	101,742,929
Payments on Shares redeemed	(35,230,580)	(34,298,822)
Net cash provided by (used in) financing activities	20,271,063	67,444,107
Cash
Net increase in cash	0	0
Cash, beginning of period	0	0
Cash, end of period	$ 0	$ 0