Developer: F2Pool is suspected of deliberately filtering transactions involving OFAC sanctioned addresses

Bitcoin developer @0xB10C posted that according to its Bitcoin mining pool transaction review monitoring service miningpool-observer, F2Pool is likely to have deliberately filtered four transactions involving OFAC (U.S. Treasury Department’s Office of Foreign Assets Control) sanctioned addresses in the past few weeks. trade. The author pointed out that there are usually many reasons why transactions are not included in the block. It may be because transactions propagate in the network at different speeds. Each node has its own set of valid transactions. Mining pools may also prioritize transactions based on different reasons. Processing, including special payments received, etc. But for these four transactions that were not included in the block by F2Pool, the author analyzed the rate distribution of the missing transactions and the included alternative transactions (for example, the former can provide more mining fees), combined with the block space situation (the space is enough to accommodate but not actually included), concluding that this is a case of intentional filtering.