According to ZachXBT, a prominent on-chain investigator, a 'Black U' Over-the-Counter (OTC) desk is allegedly linked to Chinese organized crime and responsible for laundering millions of dollars for the Lazarus Group. In a public accusation, ZachXBT claimed that after the associated trading account was frozen, the operator used a fabricated story on social media to manipulate the exchange into releasing the funds. This situation highlights significant security and counterparty risks for traders engaging in the OTC market, particularly concerning the circulation of illicitly sourced funds (known as 'Black U' or illicit USDT) and connections to sanctioned entities like the North Korean hacking syndicate.