Combined Statements of Cash Flows - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Cash Flows from Operating Activities:
Net increase (decrease) in net assets resulting from operations	$ (157,113,079)	$ 213,884,584	$ (701,916)	$ 180,266,337
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Purchases of bitcoin			(177,354,133)	(278,780,084)
Sales of bitcoin			82,614,409	89,500,820
Net realized (gain) loss on investment in bitcoin	(6,465,881)	(2,814,719)	(22,776,065)	(1,657,725)
Net change in unrealized (appreciation) depreciation	163,300,788	(211,365,660)	22,665,827	(179,027,692)
Change in operating assets and liabilities:
Sponsor's fee payable			(218,045)	295,712
Net cash provided by (used in) operating activities			(95,769,923)	(189,402,632)
Cash Flows from Financing Activities:
Proceeds from issuance of Shares			177,354,133	278,780,084
Payments on Shares redeemed			(81,584,210)	(89,377,452)
Net cash provided by (used in) financing activities			95,769,923	189,402,632
Cash
Net decrease in cash			0	0
Cash, beginning of period			0	0
Cash, end of period	0	0	0	0
Franklin Bitcoin ETF [Member]
Cash Flows from Operating Activities:
Net increase (decrease) in net assets resulting from operations	(157,113,079)	213,884,584	(701,916)	180,266,337
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Purchases of bitcoin			(177,354,133)	(278,780,084)
Sales of bitcoin			82,614,409	89,500,820
Net realized (gain) loss on investment in bitcoin	(6,465,881)	(2,814,719)	(22,776,065)	(1,657,725)
Net change in unrealized (appreciation) depreciation	163,300,788	(211,365,660)	22,665,827	(179,027,692)
Change in operating assets and liabilities:
Sponsor's fee payable			(218,045)	295,712
Net cash provided by (used in) operating activities			(95,769,923)	(189,402,632)
Cash Flows from Financing Activities:
Proceeds from issuance of Shares			177,354,133	278,780,084
Payments on Shares redeemed			(81,584,210)	(89,377,452)
Net cash provided by (used in) financing activities			95,769,923	189,402,632
Cash
Net decrease in cash			0	0
Cash, beginning of period			0	0
Cash, end of period	$ 0	$ 0	$ 0	$ 0