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Significant Accounting Policies - Summary of Trust's Assets Accounted at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Jul. 21, 2024
Assets      
Investment in ether, at fair value $ 173,794 $ 404,529 $ 0
Level 1      
Assets      
Investment in ether, at fair value 173,794 404,529  
Level 2      
Assets      
Investment in ether, at fair value 0 0  
Level 3      
Assets      
Investment in ether, at fair value $ 0 $ 0