We can confirm that Marathon did mine an invalid block. We utilize a small portion of our hash rate to experiment with our development pool and research potential methods to optimize our operations. The error was the result of an unanticipated bug that came from one of our…
— Marathon Digital Holdings (NASDAQ: MARA) (@MarathonDH) September 27, 2023
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Source: https://decrypt.co/199005/marathon-mined-an-invalid-bitcoin-block-heres-what-that-means