Combined Schedule of Investments		Sep. 30, 2024 USD ($) BTC	Mar. 31, 2024 USD ($) BTC
Schedule of Investments [Line Items]
Cost		$ 423,417,042	$ 280,623,942
Fair Value	[1]	$ 452,356,258	$ 341,901,126
Investment in bitcoin [Member]
Schedule of Investments [Line Items]
Quantity of Bitcoin | BTC		7,103.8488	4,842.9986
Cost		$ 423,417,042	$ 280,623,942
Fair Value		$ 452,356,258	$ 341,901,126
% of Net Assets		100.01%	100.00%
Total investments [Member]
Schedule of Investments [Line Items]
Cost		$ 423,417,042	$ 280,623,942
Fair Value		$ 452,356,258	$ 341,901,126
% of Net Assets		100.01%	100.00%
Less liabilities [Member]
Schedule of Investments [Line Items]
Fair Value		$ (65,617)	$ (21)
% of Net Assets		(0.01%)	0.00%
Net assets [Member]
Schedule of Investments [Line Items]
Fair Value		$ 452,290,641	$ 341,901,105
% of Net Assets		100.00%	100.00%
Franklin Bitcoin ETF [Member]
Schedule of Investments [Line Items]
Cost		$ 423,417,042	$ 280,623,942
Fair Value	[1]	$ 452,356,258	$ 341,901,126
Franklin Bitcoin ETF [Member] | Investment in bitcoin [Member]
Schedule of Investments [Line Items]
Quantity of Bitcoin | BTC		7,103.8488	4,842.9986
Cost		$ 423,417,042	$ 280,623,942
Fair Value		$ 452,356,258	$ 341,901,126
% of Net Assets		100.01%	100.00%
Franklin Bitcoin ETF [Member] | Total investments [Member]
Schedule of Investments [Line Items]
Cost		$ 423,417,042	$ 280,623,942
Fair Value		$ 452,356,258	$ 341,901,126
% of Net Assets		100.01%	100.00%
Franklin Bitcoin ETF [Member] | Less liabilities [Member]
Schedule of Investments [Line Items]
Fair Value		$ (65,617)	$ (21)
% of Net Assets		(0.01%)	0.00%
Franklin Bitcoin ETF [Member] | Net assets [Member]
Schedule of Investments [Line Items]
Fair Value		$ 452,290,641	$ 341,901,105
% of Net Assets		100.00%	100.00%

[1] Cost of investment in bitcoin: $423,417,042 at September 30, 2024 and $280,623,942 at March 31, 2024.