Elon Musk was a proponent of Bitcoin and then wasn't after saying its mining operations are not green enough.The majority of non-green energy from the Bitcoin network comes from China, using as much as 40% coal to power its operations.Despite itself, China has given Bitcoin longs the victory by shutting down 90% of its mining capacity.This grants bulls two tailwinds: Musk back on their side and an abatement of the fear China controls most of the network.