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Consolidated Statements of Cash Flows
 12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Cash flows from operating activities:        
Net income (loss) ¥ (119,539,049) $ (16,629,439) ¥ (254,352,054) ¥ 31,118,886
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Amortization of right-of-use assets 1,975,693 274,845 5,752,591 5,505,422
Depreciation and amortization expenses 9,655,404 1,343,192 4,422,560 3,928,131
Gain on disposal of property, plant and equipment (7,007) (975)
Loss (gain) on lease termination (102,732) (14,291) 113,588
Share-based compensation 401,520 55,857 718,411 9,347,347
Inventory write-down 10,914,374 1,518,331 60,767,978 184,073,191
Change in fair value of cryptocurrencies 15,744,170 2,190,219
Changes in assets and liabilities:        
Accounts receivable, net 1,175,678 163,552 (1,732,378)
Inventories, net (27,884,590) (3,879,109) 28,782,243 (71,446,484)
Prepayments 20,010,799 2,783,763 47,159,593 304,300,103
Other current assets (3,005,135) (418,053) 511,358 51,740,635
Accounts payable 1,079,515 150,175 898,564 10,591,202
Advance from customers (9,022,758) (1,255,183) (16,662,392) (794,302,470)
Operating lease liabilities, current (2,031,618) (282,625) (4,349,974) (5,330,448)
Other current liabilities (38,693,414) (5,382,757) (5,504,025) (4,466,304)
Net cash used in operating activities (139,329,150) (19,382,498) (133,473,937) (274,940,789)
Cash flows from investing activities:        
Purchases of property, plant and equipment (36,367,661) (5,059,215) (105,482,822) (17,531,162)
Proceeds from disposal of property, plant and equipment 16,955 2,359
Proceeds from sales of short-term investments 33,640,500
Purchases of intangible assets (49,292,208)
Purchase of cryptocurrencies (220,414,835) (30,662,572)
Net cash used in investing activities (256,765,541) (35,719,428) (105,482,822) (33,182,870)
Cash flows from financing activities:        
Proceeds from issuance of ordinary shares and warrants 315,620,394 43,906,905 72,802,734 144,043,186
Cash contribution from a noncontrolling shareholder 9,999,557 1,391,069
Proceeds from bank loans 220,030,488 30,609,105 128,247,467 17,093,316
Repayments of bank loans (169,667,635) (23,602,976) (1,530,000) (140,000)
Net cash provided by financing activities 375,982,804 52,304,103 199,520,201 160,996,502
Effects of exchange rate changes on cash, cash equivalents and restricted cash 4,379,036 609,179 159,828 1,132,887
Net decrease in cash, cash equivalents and restricted cash (15,732,851) (2,188,644) (39,276,730) (145,994,270)
Cash, cash equivalents and restricted cash at beginning of the year 48,582,654 6,758,479 87,859,384 233,853,654
Cash, cash equivalents and restricted cash at end of the year 32,849,803 4,569,835 48,582,654 87,859,384
Supplemental cash flow disclosures:        
Interest paid 9,281,086 1,291,120 3,773,028 180,619
Income taxes paid 89,169
Non-cash investing and financing activities:        
Operating lease right-of-use asset obtained in exchange for operating lease liability 1,770,209 246,259 5,015,808 4,557,092
Liabilities assumed in connection with purchase of property, plant and equipment 46,180,063
Cryptocurrencies acquired through issuance of ordinary shares ¥ 36,294,458 $ 5,049,031