The seizure comes after agents and analysts from the U.S. Secret Service traced victim deposits that were laundered through several cryptocurrencies, a technique the DOJ described as “chain hopping” in its release Tuesday.

Tether froze $225 million of its stablecoin on Monday following a collaborative investigation between the DOJ, crypto exchange OKX, and Tether itself. Pig butchering is a scam that involves luring victims in with traditional romance scams. The victims are often requested to send cryptocurrencies overseas.

“This seizure should also serve as a reminder to cybercriminals that, although the current landscape of the cryptocurrency ecosystem may seem like an ideal way to launder ill-gotten gains, law enforcement will continue to develop the expertise needed to follow the money and seize it back for victims,” the DOJ said.