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This work briefly (An extended version can be found at https://kar.kent.ac.uk/id/eprint/63502) examines some of the most relevant Bitcoin Laundry Services, commonly known as tumblers or mixers, and studies their main features to try to answer some fundamental questions including their security, popularity, transaction volume, and generated revenue. Our research aims to inform both legitimate users and Law Enforcement about the characteristics and limitations of these services.