I mined cryptocurrency in 2018. I want to claim this as self-employment. Can I claim the money spent on hardware as business expense instead of asset depreciation?

The hardware I mentioned is the graphic cars and computer I used to "mine" the cryptocurrency. I haven't sold any of the coin I mined yet and I usually make about 1 coin a month, how do I report the income? Is its value determine at the time I received the coin or is it the current market value now? The reason I asked is its market value now is only 1/10 of what it was a year ago. Thanks!