v3.26.1
Fair Value of ZEC - Summary of changes in quantity of ZEC and the respective fair value (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Zec
Jun. 30, 2025
USD ($)
Zec
Jun. 30, 2026
USD ($)
Zec
Jun. 30, 2025
USD ($)
Zec
Fair Value Disclosures [Abstract]        
Investment Owned, Balance | Zec     393,522.33134026 392,723.58934327
ZEC contributed | Zec     0 4,888.2327252
ZEC distributed for Sponsor's Fee, related party | Zec     (4,848.64774083) (4,883.12100169)
Net change in unrealized appreciation/depreciation on investment in ZEC | Zec     0 0
Net realized gain (loss) on investment in ZEC | Zec     0 0
Investment Owned, Balance | Zec 388,673.68359943 392,728.70106678 388,673.68359943 392,728.70106678
Investment Owned, at Fair Value | $     $ 200,441 $ 22,040
ZEC contributed | $     0 191
ZEC distributed for Sponsor's Fee, related party | $     (1,783) (197)
Net change in unrealized appreciation/depreciation on investment in ZEC | $ $ 56,102 $ 576 (44,598) (6,308)
Net realized gain (loss) on investment in ZEC | $ 767 (200) 1,192 (402)
Investment Owned, at Fair Value | $ $ 155,252 $ 15,324 $ 155,252 $ 15,324