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Summary of significant accounting policies - Cryptocurrencies (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Summary of significant accounting policies |  |  |  |
Impairment loss of cryptocurrencies | $ 0 | $ 7,102 | $ 181,263 | $ 181,263

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- Definition Amount of impairment loss from right-of-use asset from Cryptocurrencies. + References No definition available. + Details
Name: | btog_CryptocurrenciesImpairmentLoss
Namespace Prefix: | btog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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