INVESTMENT IN BITCOIN - Schedule of Changes in Quantity of Bitcoin Held (Details) - Franklin Bitcoin ETF [Member]	3 Months Ended
	Jun. 30, 2025 USD ($) Bitcoin		Jun. 30, 2024 USD ($) Bitcoin
INVESTMENT IN BITCOIN [Abstract]
Beginning balance (in Bitcoin) | Bitcoin	4,956.3464		4,842.9986
Beginning balance of fair value	$ 411,158,674	[1]	$ 341,901,126
Bitcoin purchased for the creation of Shares, Quantity (in Bitcoin) | Bitcoin	608.151		1,623.9995
Bitcoin purchased for the creation of Shares	$ 55,501,643		$ 101,742,929
Bitcoin sold for the redemption of Shares, Quantity (in Bitcoin) | Bitcoin	(405.4311)		(579.9999)
Bitcoin sold for the redemption of Shares	$ (35,230,580)		$ (34,298,822)
Principal on bitcoin sales to pay expenses, Quantity (in Bitcoin) | Bitcoin	(3.7004)		0
Principal on bitcoin sales to pay expenses	$ (301,334)		$ 0
Net realized gain (loss) from bitcoin sold for the redemption of shares	9,019,211		168,747
Net change in unrealized appreciation (depreciation) on investment in bitcoin	$ 119,518,907		$ (36,459,025)
Ending Balance (in Bitcoin) | Bitcoin	5,155.3659		5,886.9982
Ending balance of fair value	$ 559,666,521	[1]	$ 373,054,955

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