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Significant Accounting Policies - Summary of Trust's Assets Accounted at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Jul. 21, 2024
Assets    
Investment in ether, at fair value $ 404,529 [1] $ 0
Level 1    
Assets    
Investment in ether, at fair value 404,529  
Level 2    
Assets    
Investment in ether, at fair value 0  
Level 3    
Assets    
Investment in ether, at fair value $ 0  
[1] No comparative period presented as the Trust commenced operations on July 22, 2024.