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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities      
Net loss $ (4,340,975) $ (11,525,102) $ (27,114,293)
Adjustments to reconcile net loss to net cash used in operating activities      
Amortization and depreciation 1,125,254 1,207,510 1,192,578
Share-based compensation 1,265,189 1,646,999 1,682,460
Loss on investments in marketable securities, net 9,266 134,134 8,031,595
Unrealized gain from fair value change of the long-term investments, net (6,353,888) (5,588,051)
Loss on investments in derivatives 4,289
Gain on derecognition of non-financial assets (75,000)
Loss on disposal of long-lived assets 110,852 205,189 392
Impairment loss on long-lived assets 750,381
Allowance for credit loss of due from a related party 521,007
Write-off of prepayment and other receivables 62,369
Write-down of inventories 13,206
Loss on disposal of subsidiaries 3,638
Gain on use of digital currencies (4,918)
Settlement of service fee by tokens and digital currencies 90,457
Operating lease cost 252,345 349,031 425,280
Interest income (235,560) (41,246)
Interest expense and accretion of convertible debts 45,266 87,537 130,397
Accretion of finance lease obligation 1,435 4,450
Reversal of deferred cash bonus (1,646,228)
Changes in operating assets and liabilities      
Accounts receivable 126,717 (95,704) (16,501)
Inventories 14,516 8,053 3,358
Other receivables and prepayments 226,805 (105,584) 695,308
Long-term deposits 29,106 19,328  
Due from brokers 652 75,728 83,957
Amounts due from related parties 63,050 (46,349) 112,635
Amounts due to related parties (8,524) (6,805) (264,934)
Accounts payable and accrued expenses 398,635 1,918,751 855,272
Operating lease liabilities (389,365) (369,505) (450,807)
Net cash used in operating activities (7,724,364) (12,318,965) (14,651,633)
Cash flows from investing activities      
Purchases of intangible assets (6,026)
Purchases of property and equipment (3,015) (186,916) (131,750)
Proceeds from disposal of property and equipment 15,385
Disposal of subsidiaries, net of cash disposed (113,830)
Proceeds from sales of investment securities 93,215 20,116,734
Loan to a related party (92,459) (330,341) (3,358,089)
Repayment of loan and interest from a related party 611,641 2,962,153
Net cash provided by investing activities 624,767 2,444,896 16,507,039
Cash flows from financing activities      
Loan from related parties 2,500,000 500,000 3,500,000
Repayment of loan due to related parties (5,489,665)
Proceeds from issuance of subsidiaries shares 5,360
Proceeds from issuance of Class A Ordinary Shares and warrants 1,575,562 4,000,000
Payments of offering costs
Exercise of share options 16,506 169,460 694,224
Exercise of warrants 130,012
Loan from a bank   3,000,000
Repayment of bank loan (3,000,000)  
Proceeds from issuance of convertible notes 3,000,000 3,000,000
Payment of finance lease obligations (49,358) (53,846)
Net cash provided by financing activities 4,092,068 6,625,462 2,780,725
Net (decrease) increase in cash and cash equivalents and restricted cash (3,007,529) (3,248,607) 4,636,131
Cash and cash equivalents and restricted cash – Beginning of year 5,012,880 8,261,487 3,625,356
Cash and cash equivalents and restricted cash – End of year 2,005,351 5,012,880 8,261,487
Supplemental disclosures of cash flow information      
Interest paid 94,108 64,744 273,155
Income taxes paid
Proceeds in broker accounts 20,116,734
Non-cash operating, investing and financing activities      
Right-of-use assets obtained in exchange for new operating lease liabilities 338,525 549,596
Settlement of service fee by tokens and digital currencies 90,457
Convertible notes converted to Class A Ordinary Shares 6,000,000
Settlement of deferred cash bonus by issuance of share options 3,078,196
Reconciliation of cash and restricted cash      
Cash and cash equivalents 2,005,351 1,882,545 8,131,217
Restricted cash 3,130,335 130,270
Total cash and cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 2,005,351 $ 5,012,880 $ 8,261,487