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Financial Highlights - Summary of Financial Highlights of NAV per Share (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2025
Net Asset Value    
Net asset value per Share, beginning of period $ 18.24 $ 33.28
Net realized and change in unrealized gain (loss) on investments in Ether 6.58 (8.44)
Net investment income (loss) (0.01) (0.03)
Net income (loss) 6.57 (8.47)
Net asset value per Share, end of period 24.81 24.81
Market value per Share, beginning of period 18.24 33.39
Market value per Share, end of period $ 25.13 $ 25.13
Ratio to average Net Assets    
Net Investment income (loss) (0.25%) (0.25%)
Expenses 0.25% 0.25%
Total Return, at net asset value 36.02% (25.45%)
Total Return, at market value 37.77% (24.74%)