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FINANCIAL HIGHLIGHTS - Summary of Per Share Performance (Details) - Franklin Crypto Index ETF [Member]
 3 Months Ended 7 Months Ended 9 Months Ended
Feb. 10, 2025
USD ($)
DigitalAssets
CreationUnits
$ / shares
$ / item
shares
Jan. 22, 2025
USD ($)
$ / shares
shares
Sep. 30, 2026
USD ($)
DigitalAssets
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2026
USD ($)
DigitalAssets
$ / shares
shares
Dec. 31, 2025
DigitalAssets
COMBINED FINANCIAL HIGHLIGHTS [Abstract]              
Net asset value per Share, beginning of period (in Dollars per share)     $ 14.67 $ 27.11 $ 25.13 [1] $ 22.7  
Net investment loss (in Dollars per share) [2]     (0.01) (0.01) (0.01) (0.03)  
Net realized and unrealized gain (loss) on investment in Digital Assets (in Dollars per share)     6.62 3.24 5.22 (1.39)  
Net increase (decrease) in net assets from operations (in Dollars per share) [3]     6.61 3.23 5.21 (1.42)  
Net asset value per Share, end of period (in Dollars per share)     $ 21.28 $ 30.34 $ 30.34 $ 21.28  
Total return, at net asset value [4]     45.06% 11.91% 20.73% (6.26%)  
Ratio to average net assets(e)              
Net investment loss [5]     (0.19%) (0.07%) (0.04%) (0.19%)  
Gross expenses [5]     0.19% 0.19% 0.19% 0.19%  
Net expenses [5]     0.19% 0.07% [6] 0.04% [6] 0.19%  
Shares issued during period, new issues (in Shares) | shares     100,000 100,000 150,000 450,000  
Proceeds from issuance of shares (in Dollars) | $         $ 4,044,659 $ 7,295,474  
Redemption of shares (in Dollars) | $ [7]     $ 1,981,975 $ 0 $ 0 1,981,975  
Threshold value of fund’s assets on basis of which fees is determined (in Dollars) | $           $ 10,000,000,000  
Bitcoin [Member]              
Ratio to average net assets(e)              
Number of Digital Assets per creation unit 11.06240875            
Quantity of Digital Assets (in DigitalAssets) | DigitalAssets 22.1248175   155.373     155.373 87.3467
Cost of Digital Asset per unit (in Dollars per Item) | $ / item 97,227.8            
Ethereum [Member]              
Ratio to average net assets(e)              
Number of Digital Assets per creation unit 61.7774073            
Quantity of Digital Assets (in DigitalAssets) | DigitalAssets 123.5548146   806.4596     806.4596 474.4721
Cost of Digital Asset per unit (in Dollars per Item) | $ / item 2,665.23            
Initial Seed Shares [Member]              
Ratio to average net assets(e)              
Shares issued during period, new issues (in Shares) | shares   4,000          
Shares issued, price per share (in Dollars per share)   $ 25          
Proceeds from issuance of shares (in Dollars) | $   $ 100,000          
Redemption of shares (in Dollars) | $ $ 100,000            
Seed Creation Units [Member]              
Ratio to average net assets(e)              
Shares issued during period, new issues (in Shares) | shares 100,000            
Shares issued, price per share (in Dollars per share) $ 24.8            
Proceeds from issuance of shares (in Dollars) | $ $ 2,480,449.33            
Number of seed creation units issued (in CreationUnits) | CreationUnits 2            
[1] On January 22, 2025, Franklin Resources, Inc. (the “Seed Capital Investor”), an affiliate of the Sponsor, subject to conditions, purchased 4,000 Shares at a per-Share price equal to $25.00 (the “Initial Seed Shares”). Delivery of the Initial Seed Shares was made on January 22, 2025. Total proceeds to the Fund from the sale of the Initial Seed Shares were $100,000. On February 10, 2025, the Initial Seed Shares were redeemed for $100,000, and the Seed Capital Investor purchased two creation Units in a cash transaction comprised of a total of 100,000 Shares at a per-Share price based on 11.06240875 bitcoin and 61.7774073 ether per Creation Unit, for a total of 22.1248175 bitcoin and 123.5548146 ether (the “Seed Creation Units”). The cash proceeds to the Fund from the sale of the Seed Creation Units were used by the Fund to purchase 22.1248175 bitcoin at the price of $97,227.80 per bitcoin and 123.5548146 ether at the price of $2,665.23 per ether on February 10, 2025 (exclusive of transaction and other costs incurred in connection with the conversion of the cash proceeds to bitcoin and ether respectively, which were paid by the Seed Capital Investor). Thus, the ultimate total proceeds to the Fund from the sale of the Seed Creation Units were $2,480,449.33 (an amount representing 22.1248175 bitcoin and 123.5548146 ether) representing 100,000 Shares at a per-Share price equal to $24.80. Further, the transaction and other costs incurred in connection with the Seed Creation Units were paid by the Seed Capital Investor and not borne by the Fund.
[2] Calculated using average Shares outstanding.
[3] 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.
[4] 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 Total return for periods of less than a year are not annualized.
[5] Annualized.
[6] From February 20, 2025 (the day the Shares were initially listed on the Exchange) to August 29, 2025, the Sponsor agreed to waive the entire Sponsor’s Fee on the first $10.0 billion of the Fund’s assets.
[7] 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.