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Financial Highlights - Summary of Financial Highlights of NAV per Share (Details) - $ / shares
 2 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Net Asset Value        
Net asset value per Share, beginning of period $ 35.25 $ 24.81   $ 33.28
Net realized and change in unrealized gain (loss) on investments in Ether (9.22) 16.56   8.13
Net investment income (loss) (0.01) (0.02)   (0.06)
Net income (loss) (9.23) 16.54   8.07
Net asset value per Share, end of period 26.02 41.35 $ 26.02 41.35
Market value per Share, beginning of period 34.6 25.13   33.39
Market value per Share, end of period $ 25.94 $ 41.48 $ 25.94 $ 41.48
Ratio to average Net Assets        
Net Investment income (loss) (0.25%) (0.25%)   (0.25%)
Expenses 0.25% 0.25%   0.25%
Total Return, at net asset value (26.18%) 66.67% 4.08% 24.25%
Total Return, at market value (25.03%) 65.06% 3.76% 24.23%