A former hospitality worker in the United Kingdom has reportedly been found guilty of money laundering more than the equivalent of $2.5 billion worth of Bitcoin ( BTC ) in a UK court that specializes in heavy fraud cases.

According to a recent BBC report , the Southwark Crown Court has found Jian Wen of money laundering $2.5 billion worth of Bitcoin after a five-year investigation, involving scrutiny of 48 electronic devices and thousands of digital files, many of which were translated from Mandarin.

Wen's shift in lifestyle was what drew attention from the authorities. In 2017, she went from living in a flat above a Chinese restaurant in Leeds to renting a six-bedroom house in North London costing approximately $21,420 per month.

During the same year, she reportedly attempted to purchase a series of expensive houses in London but faced challenges passing money-laundering checks, despite her claims of earning millions from Bitcoin mining.

Related: German authorities seize 50K BTC connected to piracy websites

The UK police claimed that the seizure was the “largest of its kind in the UK.”Wen is due to be sentenced on May 10.

CPS chief crown prosecutor Andrew Penhale reiterated digital assets prominent use in criminal activity in recent times:

“Bitcoin and other cryptocurrencies are increasingly being used by organized criminals to disguise and transfer assets, so that fraudsters may enjoy the benefits of their criminal conduct.”

However, a recent report from the United States Treasury Department contradicts the common claim by authorities that crypto is a popular choice for money laundering, claiming that cash continues to be the preferred option.

On Feb. 8, Cointelegraph reported that the Treasury Department declared that criminals and transnational criminal organizations continue to use cash.

The Treasury highlighted the anonymity and stability of cash as a means of payment as a primary reason why it remains the preferred method of laundering illicit proceeds.

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