The US Treasury has sanctioned over a dozen individuals and entities linked to a cash-to-crypto laundering network associated with the Sinaloa Cartel. This network converted drug proceeds from fentanyl sales into cryptocurrencies, facilitating cross-border transfers. The Office of Foreign Assets Control (OFAC) blacklisted Ethereum addresses tied to the operation, requiring US-connected exchanges and financial institutions to freeze related funds. This action is part of a broader campaign against the cartel's financial infrastructure, with over 600 designations under the Kingpin Act and Executive Order 14059. The crackdown highlights the growing use of cryptocurrencies by cartels, although traditional money laundering methods still dominate. The focus on cash-to-crypto brokers underscores their role as critical entry points for illicit funds into the digital financial system, prompting increased regulatory scrutiny and compliance demands across the crypto industry.