COMBINED STATEMENTS OF ASSETS AND LIABILITIES (Parentheticals) - USD ($)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Investment in bitcoin, at fair value	$ 313,983,408	$ 280,623,942
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized, unlimited	Unlimited	Unlimited
Franklin Bitcoin ETF [Member]
Investment in bitcoin, at fair value	$ 313,983,408	$ 280,623,942
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized, unlimited	Unlimited	Unlimited