Combined Statements of Assets and Liabilities - USD ($)		Dec. 31, 2025		Mar. 31, 2025
Assets
Investment in bitcoin, at fair value	[1]	$ 500,957,877		$ 411,158,674
Bitcoin sold receivable		5,050,812		0
Total assets		506,008,689		411,158,674
Liabilities
Shares payable		5,050,865	[2]	0
Sponsor's fee payable		$ 83,286		$ 301,331
Notes Payable, Related Party, Type [Extensible Enumeration]		Related Party [Member]		Related Party [Member]
Total liabilities		$ 5,134,151		$ 301,331
Commitments and contingencies (Note 7)
Net assets		$ 500,874,538		$ 410,857,343
Shares issued (in Shares)	[3]	9,900,000		8,550,000
Shares outstanding (in Shares)	[3]	9,900,000		8,550,000
Net asset value per Share (in Dollars per share)		$ 50.59		$ 48.05
Franklin Bitcoin ETF [Member]
Assets
Investment in bitcoin, at fair value	[1]	$ 500,957,877		$ 411,158,674
Bitcoin sold receivable		5,050,812		0
Total assets		506,008,689		411,158,674
Liabilities
Shares payable		5,050,865	[2]	0
Sponsor's fee payable		$ 83,286		$ 301,331
Notes Payable, Related Party, Type [Extensible Enumeration]		Related Party [Member]		Related Party [Member]
Total liabilities		$ 5,134,151		$ 301,331
Commitments and contingencies (Note 7)
Net assets		$ 500,874,538		$ 410,857,343
Shares issued (in Shares)	[3]	9,900,000		8,550,000
Shares outstanding (in Shares)		9,900,000		8,550,000
Net asset value per Share (in Dollars per share)		$ 50.59		$ 48.05

[1] Cost of investment in bitcoin: $426,448,438 at December 31, 2025 and $313,983,408 at March 31, 2025.

[2] Pending adjustment for slippage of $53 upon settlement on January 2, 2026.

[3] No par value, unlimited amount authorized.