Spam Filter Code in Tx Relay & Mempool Acceptance Ignores OFAC SDN Sanctions #29137

1. 
   derekm commented at 3:52 am on December 23, 2023: none

   Is there an existing issue for this?

   • I have searched the existing issues

   Current behaviour

   As an American Bitcoin miner, New transactions’ inputs and outputs are not checked for OFAC SDN Sanctions against XBT, Therefore I am exposed to the risk of imprisonment should I mine a block containing txns for specially designated nationals and blocked persons.

   Expected behaviour

   As an American Bitcoin miner, I should be able to configure my node to check incoming transactions for OFAC SDN Sanctions against XBT, Because I cannot legally mine a block containing txns for specially designated nationals and blocked persons.

   Steps to reproduce

   1. Submit a standard transaction involving a specially designated national or blocked person
   2. Watch it be accepted by any and all Bitcoin nodes
   3. ???
   4. PROFIT!

   Relevant log output

   No response

   How did you obtain Bitcoin Core

   Compiled from source

   What version of Bitcoin Core are you using?

   master@c840dea27e

   Operating system and version

   MINGW64 MSYS2

   Machine specifications

   Surface Laptop Go 2

2. 
   derekm commented at 4:05 am on December 23, 2023: none

   What XBT sanctions all U.S. persons, and foreign persons in possession of U.S.-origin goods, must implement can be found here: https://www.treasury.gov/ofac/downloads/sanctions/1.0/sdn_advanced.xml
3. 
   tshev commented at 6:29 am on December 23, 2023: none

   Thank you for highlighting the issue!
4. fanquake closed this on Dec 23, 2023

   ---

5. 
   derekm commented at 2:35 pm on December 23, 2023: none

   @fanquake – Bitcoin Core’s spam filter code already has this Solver utility which provides a vSolutionsRet output parameter that contains exactly the data that needs to be matched against OFAC SDN sanctions for XBT: https://github.com/bitcoin/bitcoin/blob/master/src/script/solver.cpp#L140

   I am working on a PR to implement enforcement of these Sanctions, which enforcement is required of every U.S. person and every foreign person working for U.S. persons.

   With this Issue being posted to the official repository for Bitcoin and with this Issue being closed/dismissed by an official representative of Bitcoin Core, sanctions violations on Bitcoin have now moved from “negligent” to “culpable mental state greater than negligence.” Thank you for your service.

Contributors
derekm tshev