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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Increase in net assets from operations:              
Net investment loss $ (113,468) $ (71,085) $ (57,738) $ (131,025) $ (360,561) $ (360,683) $ (615,420)
Net realized gain on investment in Bitcoin 78,005 35,868 21,558 95,096 218,806 216,064 470,168
Net change in unrealized appreciation (depreciation) on investment in Bitcoin 9,555,222 7,475,264 (1,874,275) (284,294) 16,027,962 (18,967,171) 10,099,600
Net increase (decrease) in net assets resulting from operations 9,519,759 7,440,047 (1,910,455) (320,223) 15,886,207 (19,111,790) 9,954,348
Increase in net assets from capital share transactions:              
Shares issued         0 0 1,905,227
Net increase in net assets resulting from capital share transactions         0 0 1,905,227
Total increase (decrease) in net assets from operations and capital share transactions         15,886,207 (19,111,790) 11,859,575
Net assets:              
Beginning of year   $ 10,464,263   $ 29,576,053 10,464,263 29,576,053 17,716,478
End of year $ 26,350,470   $ 10,464,263   $ 26,350,470 $ 10,464,263 $ 29,576,053
Changes in Shares outstanding              
Shares outstanding at beginning of year   692,370,100   692,370,100 692,370,100 692,370,100 638,906,600
Shares issued         0 0 53,463,500
Net increase in Shares         0 0 53,463,500
Shares outstanding at end of year 692,370,100   692,370,100   692,370,100 692,370,100 692,370,100