Tumblers are services that mix and combine cryptocurrency funds to obscure their transactional footprint.
The Justice Department declined to comment.
The south Florida resident allegedly used TOR to access dark web marketplaces.
US Seizes $34M in Crypto Tied to Hacked HBO, Netflix, Uber Account Data Sold on Dark Web
The Justice Department calls it "one of the largest cryptocurrency forfeiture actions ever filed by the United States."
