v3.26.1
Significant Accounting Policies - Additional Information (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Accounting Policies [Line Items]    
Time used in investment valuation, description The time used is 4:00 pm ET which corresponds to 20:00 UTC during Daylight Saving Time and 21:00 UTC during non-Daylight Saving Time.  
Percentage of Net Assets 99.98% 100.00%
Net realized gains $ 94,107,222  
Cumulative realized gains 111,389,482  
Cumulative realized losses 17,282,260  
Provision for income taxes 0 $ 0
Unrecognized tax benefits $ 0 $ 0
Reporting period 12 months  
Bitcoin (BTC) [Member]    
Accounting Policies [Line Items]    
Percentage of Net Assets 77.82% 75.11%
Net realized gains $ 89,333,000 $ 119,592,000
Ethereum (ETH) [Member]    
Accounting Policies [Line Items]    
Percentage of Net Assets 12.59% 15.41%
Net realized gains $ 17,032,000 $ 23,651,000
Remaining Crypto Assets [Member]    
Accounting Policies [Line Items]    
Percentage of Net Assets 9.59% 9.48%
Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]    
Accounting Policies [Line Items]    
Significant transfers into or out of any levels of the fair value hierarchy $ 0 $ 0
Fair value, assets, level 1 to level 2 transfers, amount 0 0
Fair value, assets, level 2 to level 1 transfers, amount $ 0 $ 0