v3.26.1
Significant Accounting Policies - Summary of Trust's Assets Accounted at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2024
Assets      
Investment in ether, at fair value $ 168,496 $ 343,746 $ 404,529
Level 1      
Assets      
Investment in ether, at fair value 168,496 343,746  
Level 2      
Assets      
Investment in ether, at fair value 0 0  
Level 3      
Assets      
Investment in ether, at fair value $ 0 $ 0