Does Apple allow crypto-currency mining in ios app?
A quick skim through the App Store Review Guidelines didn't reveal anything obvious.

That said, section 2.4.2 currently contains the following:


  Design your app to use power efficiently. Apps should not rapidly drain battery, generate excessive heat, or put unnecessary strain on device resources.


I'm guessing that would be the clause they'd use to reject any crypto currency mining, which would by definition be CPU/GPU intentive.