According to a blog post by bitcoin developer b10c, in the past few weeks b10c has detected 15 missing transactions from OFAC sanctioned addresses, spread across 14 blocks, 11 of which were mined by F2Pool and one each by SBI Crypto, ViaBTC, and Foundry USA. After analyzing these blocks, b10c believes that F2Pool may have started filtering transactions sanctioned by the US Treasury Office of Foreign Assets Control (OFAC) again, but since F2Pool is currently the only mining pool that may be filtering, it will not affect Bitcoin's censorship resistance. After previous reports revealed that b10c discovered four F2Pool blocks in November 2023 filtering transactions from OFAC sanctioned addresses, the F2Pool founder admitted that F2Pool was running a "transaction filtering patch" at the time.