But behind the scenes, she and her husband, a computer programmer, were working to cash out a fortune stolen from the crypto firm Bitfinex.

Court documents revealed that the couple converted the bitcoin into regular currency while hiding in plain sight.

They split the bitcoin into small amounts, transferring it into thousands of different crypto wallets with fake identities, and mixed the stolen cash with other criminal cryptocurrencies on the darknet marketplace AlphaBay.

The pair also purchased gold coins and set up shell companies to make the bitcoin funds look legitimate.

But they accidentally exposed themselves by using a gift card paid for with the funds in a Walmart supermarket.

“Police were able to link the Walmart gift cards back to some of the proceeds of the Bitfinex hack, which then opened up the further investigation,” said Jonathan Levin, founder of cryptocurrency investigators Chainalysis, who participated in the investigation.