SIGNIFICANT ACCOUNTING POLICIES - Creation and Redemption of Shares (Details) - Franklin Bitcoin ETF [Member] - USD ($)		3 Months Ended
		Jun. 30, 2025		Jun. 30, 2024
SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Beginning Balance (in Shares)		8,550,000	[1]	8,350,000
Beginning Balance	[2]	$ 240,428,608		$ 280,623,942
Creation of Shares (in Shares)		1,050,000		2,800,000
Creation of Shares	[2]	$ 55,501,643		$ 101,742,929
Redemption of Shares (in Shares)		(700,000)		(1,000,000)
Redemption of Shares	[2]	$ (35,230,580)		$ (34,298,822)
Ending Balance (in Shares)		8,900,000	[1]	10,150,000
Ending Balance	[2]	$ 260,699,671		$ 348,068,049

[1] No par value, unlimited amount authorized.

[2] Dollar amount of balance represents the cumulative fair value of creation of shares less the redemption of shares, at the time of the specific creation or redemption.