I am relatively certain that our friends at the Treasury Department are sending lists to all financial institutions of online gambling processors and banks. IE Neteller, ProcCyber etc. If you check your bank records they will show each incoming ACH from Neteller with a reference of NT. I bet all banks will be asked to check and flag the accounts of any and all clients who have received wire transfers and ACH transfers from the master list.
Using that data they will now have a list of all their customers who have been receiving or sending ACHs and Wire Transfers from the targeted list.
It’s simple, effective and easy to run with their existing data.