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This confirms that mining is very centralised and controlled by a few institutional investors
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In theory everyone can join the network, but in practice those who actually participate in the PoW consensus (51%) and produce blocks are less than 0.1% of the miners, i.e. those 50-60 miners reported in the research.
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Am I running any minging equipment?  How would you know? If I told you I was (or wasn't) how would you know if you could trust what I said?