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FINANCIAL HIGHLIGHTS - Schedule of Financial Highlights (Details) - Franklin Ethereum ETF [Member]
 3 Months Ended
Jun. 30, 2025
$ / shares
COMBINED FINANCIAL HIGHLIGHTS [Abstract]  
Net asset value per Share, beginning of period (in Dollars per share) $ 13.94
Net investment loss (in Dollars per share) (0.01) [1]
Net realized and unrealized gain (loss) on investment in ether (in Dollars per share) 5.06
Net change in net assets from operations (in Dollars per share) 5.05 [2]
Net asset value per Share, end of period (in Dollars per share) $ 18.99
Total return, at net asset value 36.23% [3],[4]
Ratio to average net assets(e)  
Net investment loss (0.19%) [5]
Gross expenses 0.19% [5]
Net expenses 0.19% [5]
[1] Calculated using average Shares outstanding.
[2] The amount shown for a share outstanding may not agree with the change in the aggregate gains and losses on investment for the period because of the timing of transactions in the Fund’s shares in relation to fluctuating market values for the Fund’s underlying investment.
[3] Total Return at NAV is calculated assuming an initial investment made at the NAV at the beginning of the period, and redemption of Shares at NAV on the last day of the period. Total Return at NAV as shown above includes adjustments in accordance with U.S. GAAP.
[4] Calculation based on the change in net asset value of a Share during the period. Total return for periods of less than a year are not annualized.
[5] Annualized.