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A glitch in Bitcoin's block sequence showed an increase in mining concentration

A rare event occurred on the Bitcoin network when already-confirmed transactions briefly "rolled back." This happened because one group of miners (Foundry) continued their version of the chain faster and overtook another, causing the network to accept it as the main one. As a result, the last two blocks were replaced — along with them, some of the transactions recorded in them also changed

The situation has once again drawn attention to mining concentration: large pools control a significant portion of the hashrate and can influence block order in the short term. Although such events are considered a normal feature of network operation and pose no direct threat, they show BTC's dependence on a limited number of large players