Fair Value of Bitcoin - Additional Information (Details) |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Mar. 31, 2026
USD ($)
Bitcoin
$ / shares
|
Dec. 31, 2025
USD ($)
Bitcoin
$ / shares
|
Dec. 31, 2024
Bitcoin
|
|
| Fair Value, Option, Quantitative Disclosures [Line Items] | |||
| Trust held net closing balance of bitcoin | Bitcoin | 37,600.7094 | 38,468.0468 | 40,289.1335 |
| Fair value net realized losses | $ 21,767,592,000 | ||
| Fair value net of cumulative realized gains | 11,308,308,000 | ||
| Fair value cumulative realized losses | 33,075,900,000 | ||
| CME CF Bitcoin | |||
| Fair Value, Option, Quantitative Disclosures [Line Items] | |||
| Fair value of bitcoins acquired | $ 2,550,522,301,000 | $ 3,358,857,898 | |
| Bitcoin index price per share | $ / shares | $ 67,831.76 | $ 87,315.53 | |
| Lukka Prime Rate | |||
| Fair Value, Option, Quantitative Disclosures [Line Items] | |||
| Fair value of bitcoins acquired | $ 2,549,527,011,000 | $ 3,367,646,692 | |
| Bitcoin index price per share | $ / shares | $ 67,805.29 | $ 87,544 |