0xB10C Bitcoin Developer disclosed that F2Pool was the first Bitcoin mining pool to screen transactions according to OFAC penalties imposed by the United States.
The goal of the 0xB10C Bitcoin Developer project, Miningpool-Observer, is to identify instances in which Bitcoin mining pools are not mining transactions that they should have been mining.
The Miningpool-Observer instance’s RSS feed indicated six blocks lacking an OFAC-approved transaction in September and October of 2023.
The ViaBTC mining pool mined one block, the Foundry USA pool mined another, and the F2Pool mined four. Any payment or expenditure made from an address approved by the Office of Foreign Assets Control of the US Department of Treasury is considered an OFAC-sanctioned transaction.
0xB10C Bitcoin Developer said, “I conclude that the reports from miningpool-observer indicating sanctioned transactions missing from blocks by ViaBTC and Foundry are likely false-positives and not the result of filtering. The transactions missing from F2Pool’s blocks are, however, likely filtered.”
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