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Consolidated Statements of Cash Flows | 12 Months Ended
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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 |  |

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