To earn from blog you need to have lots of traffic and also lots of good article to get indexed in search results which need so much effort but it is sure if you work hard you can earn with adnetwork both adsense or with bitcoin adnetworks.
I reckon that adsense was only paying in dollar alternatively I don't think they are planning to pay in
BTC.
@OP you need to have a good content of what is your article and try your best with your niche it will pay you eventually.