I had a closer look at 15 OFAC-sanctioned transactions recently reported as missing by my miningpool-observer. While all transactions were picked up in the following blocks, it seems like one mining pool started to filter them (again).

@andrew_s_toth @mempool

My data indicates the same: Binance Pool = SecPool = SigmaPool

@bitschmidty 880k?

Next to the RSS feed (, there is now also a page displaying recent missing sanctioned transactions on miningpool-observer:

@theinstagibbs much evidence for filtering, no evidence for successful censorship

@OnlineSocratic can't DM @OnlineSocratic

@GrassFedBitcoin @leo_haf @mononautical F2Pool at least builds their own templates

@mononautical @OrangeSurfBTC would love to open an issue on The Mempool Open Source Project® for this, but:

@emzy love it as test for my fork-observer!

@AnyoneOReally1 @mempool mempools can differ - @mempool's nodes likely have a higher uptime and could be better connected. Probably also non-default mempool configuration for 'mempoolexpiry' and 'maxmempool' (size in bytes) which might cause to keep older, low fee tx around for longer one of my nodes:

@ajtowns @f2pool_official SELECT pool_name, COUNT(height), COUNT(*) FILTER (WHERE in_block) / COUNT(in_template) * 100 FROM sanctioned_transaction_info JOIN block ON = block_id GROUP BY pool_name; (since 2024-12-02, don't have older data at hand atm)

@ajtowns @f2pool_official You would find it better if I would only publicize transactions we can certainly assume to have been filtered?

@peterktodd @ajtowns @f2pool_official @satofishi I wrote my observation down last year in and amended an update after they stopped filtering. We don't (yet) know for sure if they started again or if the two recent transactions just coincidences.

@wk057 @mononautical @f2pool_official fwiw: just checked a bunch of nodes and all saw the transaction at around 06:17:10 UTC or slightly later. F2Pools header timestamp is 06:17:21 UTC (+11s) and I saw the block at 06:18:07 UTC (another +46s). No doubt that the transaction might have been too "young".