v3.26.3
COMBINED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 7 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2026
Expenses        
Sponsor's fee $ 7,243 $ 2,750 $ 5,053 $ 17,192
Less waiver 0 (1,741) (4,044) 0
Total expenses 7,243 1,009 1,009 17,192
Net investment loss (7,243) (1,009) (1,009) (17,192)
Net realized and change in unrealized gain (loss) on investment in Digital Assets        
Net realized gain (loss) from Digital Assets sold for the redemption of Shares, sold to pay expenses and sold for rebalancing (94,156) 116 315 (135,238)
Net change in unrealized appreciation (depreciation) on investments in Digital Assets 5,765,858 459,814 1,028,699 1,648,404
Net realized and change in unrealized appreciation (depreciation) on investments in Digital Assets 5,671,702 459,930 1,029,014 1,513,166
Net increase (decrease) in net assets resulting from operations $ 5,664,459 $ 458,921 $ 1,028,005 $ 1,495,974
Net increase (decrease) in net assets per Share (in Dollars per share) [1],[2] $ 6.64 $ 2.4 $ 6.32 $ 2.24
Franklin Crypto Index ETF [Member]        
Expenses        
Sponsor's fee $ 7,243 $ 2,750 $ 5,053 $ 17,192
Less waiver 0 (1,741) (4,044) 0
Total expenses 7,243 1,009 1,009 17,192
Net investment loss (7,243) (1,009) (1,009) (17,192)
Net realized and change in unrealized gain (loss) on investment in Digital Assets        
Net realized gain (loss) from Digital Assets sold for the redemption of Shares, sold to pay expenses and sold for rebalancing (94,156) 116 315 (135,238)
Net change in unrealized appreciation (depreciation) on investments in Digital Assets 5,765,858 459,814 1,028,699 1,648,404
Net realized and change in unrealized appreciation (depreciation) on investments in Digital Assets 5,671,702 459,930 1,029,014 1,513,166
Net increase (decrease) in net assets resulting from operations $ 5,664,459 $ 458,921 $ 1,028,005 $ 1,495,974
Net increase (decrease) in net assets per Share (in Dollars per share) [1],[2] $ 6.64 $ 2.4 $ 6.32 $ 2.24
[1] Net increase (decrease) in net assets per Share based on average Shares outstanding during the period.
[2] The change in Financial highlights may not agree with Net increase (decrease) in net assets per Share because of the timing of transactions in the Fund’s shares in relation to fluctuating market values for the Fund’s underlying investment.