Combined Statements of Assets and Liabilities - USD ($)		Jun. 30, 2025	Mar. 31, 2025
Assets
Investment in bitcoin, at fair value	[1]	$ 559,666,521	$ 411,158,674
Total assets		559,666,521	411,158,674
Liabilities
Sponsor’s fee payable		$ 237,306	$ 301,331
Notes Payable, Related Party, Type [Extensible Enumeration]		Related Party [Member]	Related Party [Member]
Total liabilities		$ 237,306	$ 301,331
Commitments and contingencies (Note 7)
Net assets		$ 559,429,215	$ 410,857,343
Shares issued (in Shares)	[2]	8,900,000	8,550,000
Shares outstanding (in Shares)	[2]	8,900,000	8,550,000
Net asset value per Share (in Dollars per share)		$ 62.86	$ 48.05
Franklin Bitcoin ETF [Member]
Assets
Investment in bitcoin, at fair value	[1]	$ 559,666,521	$ 411,158,674
Total assets		559,666,521	411,158,674
Liabilities
Sponsor’s fee payable		$ 237,306	$ 301,331
Notes Payable, Related Party, Type [Extensible Enumeration]		Related Party [Member]	Related Party [Member]
Total liabilities		$ 237,306	$ 301,331
Commitments and contingencies (Note 7)
Net assets		$ 559,429,215	$ 410,857,343
Shares issued (in Shares)	[2]	8,900,000	8,550,000
Shares outstanding (in Shares)	[2]	8,900,000	8,550,000
Net asset value per Share (in Dollars per share)		$ 62.86	$ 48.05

[1] Cost of investment in bitcoin: $342,972,348 at June 30, 2025 and $313,983,408 at March 31, 2025.

[2] No par value, unlimited amount authorized.