Cypercurrency
Question :

Is buying and selling of cryptocurrency and gaining profit from it allowed?

Answer :

Yes, it is allowed.

Bitcoin Virtual Cryptocurrency
Question :

Is buying, selling and spending Bitcoins permissible?

Answer :

The mentioned transactions are permissible, but the spread of such transactions might subject the monies of believers to danger, so one should act in precaution.

Cryptocurrency Mining
Question :

Is it permissible to do mining of cryptocurrency like bitcoin, or investing in the mining of bitcoin? I am not asking about trading. My question is specific for mining of bitcoin. Will the money earned from bitcoin mining be lawful?

Answer :

Such work in itself is permissible.

Ethereum
Question :

I have previously read your ruling regarding the permissibility of Bitcoin transactions. Does the same ruling apply to other cryptocurrencies like Ethereum?

Answer :

Yes, it does.