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Financial Highlights - Summary of Financial Highlights of NAV per Share (Details) - $ / shares
 5 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2025
Net Asset Value      
Net asset value per Share, beginning of period $ 35.25   $ 33.28
Net realized and change in unrealized gain (loss) on investments in Ether (1.94)   (3.59)
Net investment income (loss) (0.03)   (0.08)
Net income (loss) (1.97)   (3.67)
Net asset value per Share, end of period 33.28 $ 33.28 29.61
Market value per Share, beginning of period 34.6   33.39
Market value per Share, end of period $ 33.39 $ 33.39 $ 29.59
Ratio to average Net Assets      
Investment income (loss) (0.25%)   (0.25%)
Expenses 0.25%   0.25%
Total Return, at net asset value (5.59%) 33.12% (11.03%)
Total Return, at market value (3.50%) 33.56% (11.38%)