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Summary of significant accounting policies - Prepayments, net (Details) - USD ($)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Summary of significant accounting policies
Provision for doubtful debts recognized	$ 0	$ 117,000	$ 0

X

- Definition

Amount of expense (reversal of expense) for expected credit loss on prepayments.

+ References

No definition available.

+ Details

Name:	btog_PrepaymentsCreditLossExpenseReversal
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