Europol: Hardcore Criminals Are Shifting From Bitcoin to Monero, Zcash and Dash (news.bitcoin.com)

A multitude of representatives of law enforcement agencies from around the world have talked about the use of bitcoin by criminal elements, sometimes revealing ignorance about cryptocurrencies in the process. Now it appears that Europol at least is trying to go deeper, learning about various altcoins and how they can be used too.
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