Bitcoin hash rate is now five times as high as in January 2018 while the mining pool distribution has stayed relatively the same. At any given point, a maximum of four mining pools control more than 50% of the hash rate.
Source: The Block, BTC.com
Since the pools themselves, rather than individual miners, control which transactions are included in the newly mined blocks, there have been concerns about miner centralization.
For example, mining pools operated by Bitmain, a Chinese company that controls the majority of ASIC miner production, controlled a combined hash rate of more than 40% for the entire H1 of 2018.
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An analysis of Bitcoin’s mining pool distribution written by Larry Cermak @ https://www.theblockcrypto.com/2019/08/21/an-analysis-of-bitcoins-mining-pool-distribution/?utm_source=rss&utm_medium=rss&utm_campaign=default August 21, 2019 Larry Cermak