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Summary of significant accounting policies - Other receivables (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Summary of significant accounting policies |  |  |
Credit loss on other receivable | $ 13,875 | $ 389,528 | $ 2,582,761
Other receivable charged against the allowance | $ 2,582,761 | $ 0 | $ 0

X
- Definition Amount of direct write-downs of other receivable charged against the allowance. + References No definition available. + Details
Name: | btog_OtherReceivableAllowanceForCreditLossWriteoff
Namespace Prefix: | btog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense (reversal of expense) for expected credit loss on other receivable. + References No definition available. + Details
Name: | btog_OtherReceivableCreditLossExpenseReversal
Namespace Prefix: | btog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration