Monetary gains have always been the goal for criminals; thus, money laundering is an indispensable component of criminal schemes aimed at concealing the proceeds of illicit acts. The combined anonymity provided by the dark web and cryptocurrencies has proven to be a potent tool in the hands of threat actors, that facilitates the laundering of the gains from their ilicit activities. Since its inception, cryptocurrencies have become the preferred currency for criminals operating on the dark web. They benefit significantly from the inherent anonymity this payment method offers, creating formidable challenges for Law Enforcement Agencies (LEAs) in tracing the proceeds of criminal activities. This chapter delves into the dark web, navigating the criminal underworld of money laundering and examining how cryptocurrencies have expanded opportunities for criminals to commit offenses and launder their gains. We will explore recent case studies, such as the infamous Ronin Bridge crypto hack, to understand the impact of such crimes on the crypto ecosystem. Furthermore, we will discuss how cryptocurrencies may create opportunities for LEAs in broader financial investigations, particularly in the realm of money laundering. This involves presenting case studies illustrating exploiting the dark web and cryptocurrencies for money laundering. The aim is to recommend legislative measures and judicial/law enforcement approaches to better combat the criminal use of cryptocurrencies overall and their specific use on the dark web for money laundering purposes.