Relatefacts methodology will help to save anonymity and increase transparency of OTC trading.
Participants shouldn't share personal info, only hashed ID, that will show data with user activities related to OTC. Using Illuminates SDK, OTC provider could develop special smart contract that will check and show all mentioned data without sharing personal information.
The other point is to make a transparent tool that will allow transferring fiat for buying crypto assets. Using Illuminates SDK, banks could create a solution which will allow supplying stable coins based on real assets, that banks had right now. In this way OTC provider could use Illuminates API and with mentioned solution from bank, transfer buyer fiat to convert it into stable coins, so the deal could be done legally.
As soon as deal will be done - hash of the results will be bonded to participants hashed ID, what will form their trading history.