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Miners play a key role in cryptocurrencies such as Bitcoin: they investsubstantial computational resources in processing transactions and minting newcurrency units. It is well known that an attacker controlling more than half ofthe network's mining power could manipulate the state of the system at will.While the influence of large mining pools appears evenly split, the actualdistribution of mining power within these pools and their economicrelationships with other actors remain undisclosed. To this end, we conduct thefirst in-depth analysis of mining reward distribution within three of the fourlargest Bitcoin mining pools and examine their cross-pool economicrelationships. Our results suggest that individual miners are simultaneouslyoperating across all three pools and that in each analyzed pool a small numberof actors (<= 20) receives over 50% of all BTC payouts. While the extent of anoperator's control over the resources of a mining pool remains an open debate,our findings are in line with previous research, pointing out centralizationtendencies in large mining pools and cryptocurrencies in general.

A Deep Dive into Bitcoin Mining Pools: An Empirical Analysis of Mining Shares