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Significant Accounting Policies - Changes in Quantity of ETH and Fair Value (Details) | 7 Months Ended | 12 Months Ended
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Dec. 31, 2024 USD ($) Ethereum | Dec. 31, 2025 USD ($) Ethereum
Significant Accounting Policies [Abstract] |  |  |  |
Beginning balance (in Ethereum) | Ethereum | [1] | 0 |  | 43,935.83
Beginning balance, Fair Value | [1] | $ 0 |  | $ 146,428,902
ETH purchased (in Ethereum) | Ethereum |  | 49,793.94 | [1] | 47,219.32
ETH purchased, Fair Value |  | $ 154,052,853 | [1] | $ 172,013,256
ETH sold (in Ethereum) | Ethereum |  | (5,858.11) | [1] | (38,106.28)
ETH sold, Fair Value |  | $ (16,251,349) | [1] | $ (127,280,000)
Net change in unrealized appreciation (depreciation) from investment in ETH, Fair Value |  | 10,194,816 | [1] | (34,062,356)
Net realized gain on investment in ETH, Fair Value |  | $ (1,567,418) | [1] | $ 508,652
Ending balance (in Ethereum) | Ethereum |  | 43,935.83 | [1] | 53,048.87
Ending balance, Fair Value |  | $ 146,428,902 | [1] | $ 157,608,454
[1] | Date of seeding, the Trust did not hold any ETH as of May 20, 2024.

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