In the name of Allah the most Gracious the most Merciful
The answer to your question is as follows:
When the bitcoin is not controlled or issued by the government, it would be regarded as a ‘fake currency’. One should avoid buying or selling such a fake currency. One day it may cause a big loss to your wealth.
And Allah knows best
Darul Uloom Waqf Deoband
This answer was collected from the official website of Darul Uloom Deoband Waqf. The institution is based in India and the answers are provided in accordance to the Hanafi Fiqh.