Some parts of the U.S. have also seen an increase in extortion schemes, where the perpetrators wish to use cryptocurrencies.
That being said, these "threat-tagged" investigations only make up a "small sliver" of the thousands of cases the agency has, he said.
And unlike crimes involving cash, Armstrong said the blockchain's immutability makes it easier to track transactions. On the flip side, cryptocurrencies' anonymity or pseudonymity make it more difficult to properly investigate a crime.
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