Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Cash Flows [Abstract]
Net cash (used in) provided by operating activities	$ (96,900)	$ 78,700
Investing activities:
Purchases of digital assets	(610,000)
Investment in equity investees	(500,000)
Acquisition of cash of a subsidiary	118,300
Net cash used in investing activities	(991,700)
Financing activities:
Subscription fee from investors	809,900
Subscription fee advanced from investors		1,305,000
Net cash provided by financing activities	809,900	1,305,000
Net (decrease) increase in cash and cash equivalents	(278,700)	1,383,700
Cash, cash equivalents, beginning of period	3,129,800	7,263,600
Cash, cash equivalents, end of period	2,851,100	8,647,300
Supplemental cash flow information
Payment of interest expenses
Payment of income tax expenses	1,600
Non-cash investing and financing activities
Subscription fee advanced from investors in the form of USDC		50,000
Subscription fee from investors in the form of USDT	75,000
Issuance of common stocks to settle advance from subscription fee from investors	$ 2,755,100	$ 6,539,000