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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Statement of Cash Flows [Abstract] |  |
Net cash provided by (used in) operating activities | $ 4,915,100 | $ (1,965,200)
Investing activities: |  |
Purchases of stable coins | (610,000) | (139,900)
Purchases of digital assets |  | (3,146,500)
Investment in equity investees | (500,000) | (1,350,000)
Loans made to a related party | (610,000) |
Acquisition of cash of a subsidiary | 118,300 |
Net cash used in investing activities | (1,601,700) | (4,636,400)
Financing activities: |  |
Subscription fee from investors | 3,504,900 |
Proceeds from issuance of common stocks pursuant to private placements |  | 1,305,000
Capital injection from non-controlling shareholders |  | 88,900
Capital withdrawal by a non-controlling shareholder |  | (88,900)
Net cash provided by financing activities | 3,504,900 | 1,305,000
Net increase (decrease) in cash and cash equivalents | 6,818,300 | (5,296,600)
Cash and cash equivalents, beginning of period | 3,129,800 | 7,263,600
Cash and cash equivalents, end of period | 9,948,100 | 1,967,000
Supplemental cash flow information |  |
Payment of interest expenses |  |
Payment of income tax expenses | 1,600 |
Refund of income tax expenses |  | 1,067,600
Non-cash investing and financing activities |  |
Collection of USDC from issuance of common stocks pursuant to private placements |  | 50,000
Subscription fee from investors in the form of USDT | 2,675,000 |
Investment in equity investees in USDC |  | 300,000
Issuance of common stocks to settle advance from subscription fee from investors | $ 2,755,100 | $ 6,539,000

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