v3.26.1
SIGNIFICANT ACCOUNTING POLICIES - Summary of Changes in Shares (Details) - Franklin Bitcoin ETF [Member] - USD ($)
 3 Months Ended
Jun. 30, 2026
Jun. 30, 2025
SIGNIFICANT ACCOUNTING POLICIES [Abstract]    
Beginning Balance, Shares (in Shares) 10,900,000 [1] 8,550,000
Beginning Balance, Amount [2] $ 377,440,195 $ 240,428,608
Creation of Shares (in Shares) 150,000 1,050,000
Creation of Shares, Amount [2] $ 5,799,402 $ 55,501,643
Redemption of Shares (in Shares) (1,250,000) (700,000)
Redemption of Shares, Amount [2] $ (53,852,604) $ (35,230,580)
Ending Balance, Shares (in Shares) 9,800,000 [1] 8,900,000
Ending Balance, Amount [2] $ 329,386,993 $ 260,699,671
[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.