The former Secret Service agent already serving a six-year sentence for stealing bitcoins while investigating online black market Silk Road has confessed to pocketing even more sacks of the digital currency.

In 2015, Shaun Bridges admitted that he funneled 20,000 bitcoins worth more than $820,000 to his personal account through a series of “complex” transactions in May 2013. Bridges was part of a task force investigating the dark net market along with former Drug Enforcement Administration agent Carl Force, who also pleaded guilty to charges of money laundering, obstruction of justice and extortion.

Bridges left the Secret Service after pleading guilty to money laundering and obstruction charges. A month later, federal authorities said the former agent transferred over 1,600 of seized bitcoins from the digital wallet—which he had access to—to an account in a different digital currency exchange.

On Tuesday, Bridges, 35, pleaded guilty to one count of money laundering in connection with the missing 1,600 bitcoins, worth approximately $6.6 million today.