According to CryptoPotato, Bitcoin developer 0xB10C said that Asian Bitcoin mining pool F2Pool became the first Bitcoin mining pool to filter transactions based on sanctions from the U.S. Treasury Department's Office of Foreign Assets Control (OFAC). 0xB10C's "miningpool-observer" project found that F2Pool did not include six Bitcoin transactions from OFAC-sanctioned addresses in its blocks. It is worth noting that the two transactions missing from the ViaBTC and Foundry USA mining pool blocks are considered false positives, while the four OFAC-sanctioned transactions missing from F2Pool's blocks may have been intentionally filtered. F2Pool is the world's third-largest Bitcoin mining pool, accounting for 13.7% of all mined blocks in the past year, which means that about one in seven Bitcoin blocks may be mined under censorship if F2Pool actively filters sanctioned transactions. F2Pool co-founder Chun Wang announced that the Bitcoin mining pool will deactivate the "transaction filtering patch" until the community reaches a more comprehensive consensus on the issue.