v3.26.3
ORGANIZATION (Details)
 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 ($)
DigitalAssets
shares
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2026
USD ($)
DigitalAssets
Shares
shares
Dec. 31, 2025
DigitalAssets
ORGANIZATION [Abstract]              
Threshold multiples in which shares are issued (in Shares) | Shares           50,000  
Stock issued during the period, new issues (in Shares) | shares     100,000 100,000 150,000 450,000  
Proceeds from issuance of shares (in Dollars) (in Dollars)         $ 4,044,659 $ 7,295,474  
Redemption of Shares (in Dollars) [1]     $ 1,981,975 $ 0 $ 0 $ 1,981,975  
Bitcoin [Member]              
ORGANIZATION [Abstract]              
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            
Ether [Member]              
ORGANIZATION [Abstract]              
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            
Franklin Crypto Index ETF [Member]              
ORGANIZATION [Abstract]              
Threshold multiples in which shares are issued (in Shares) | Shares           50,000  
Stock issued during the period, new issues (in Shares) | shares     100,000 100,000 150,000 450,000  
Proceeds from issuance of shares (in Dollars) (in Dollars)         $ 4,044,659 $ 7,295,474  
Redemption of Shares (in Dollars) [2]     $ 1,981,975 $ 0 $ 0 $ 1,981,975  
Franklin Crypto Index ETF [Member] | Bitcoin [Member]              
ORGANIZATION [Abstract]              
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            
Franklin Crypto Index ETF [Member] | Ether [Member]              
ORGANIZATION [Abstract]              
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]              
ORGANIZATION [Abstract]              
Stock issued during the period, new issues (in Shares) | shares   4,000          
Shares issued, price per share (in Dollars per share) | $ / shares   $ 25          
Proceeds from issuance of shares (in Dollars) (in Dollars)   $ 100,000          
Redemption of Shares (in Dollars) $ 100,000            
Initial Seed Shares [Member] | Franklin Crypto Index ETF [Member]              
ORGANIZATION [Abstract]              
Stock issued during the period, new issues (in Shares) | shares   4,000          
Shares issued, price per share (in Dollars per share) | $ / shares   $ 25          
Proceeds from issuance of shares (in Dollars) (in Dollars)   $ 100,000          
Redemption of Shares (in Dollars) $ 100,000            
Seed Creation Units [Member]              
ORGANIZATION [Abstract]              
Stock issued during the period, new issues (in Shares) | shares 100,000            
Shares issued, price per share (in Dollars per share) | $ / shares $ 24.8            
Proceeds from issuance of shares (in Dollars) (in Dollars) $ 2,480,449.33            
Number of seed creation units issued (in CreationUnits) | CreationUnits 2            
Seed Creation Units [Member] | Franklin Crypto Index ETF [Member]              
ORGANIZATION [Abstract]              
Stock issued during the period, new issues (in Shares) | shares 100,000            
Shares issued, price per share (in Dollars per share) | $ / shares $ 24.8            
Proceeds from issuance of shares (in Dollars) (in Dollars) $ 2,480,449.33            
Number of seed creation units issued (in CreationUnits) | CreationUnits 2            
[1] 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.
[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.