South Korean prosecutors raided the country’s biggest cryptocurrency exchange, Upbit, on Thursday and Friday on suspicion of fraud, Yonhap news agency reported.

South Korea plays an outsized role in the global cryptocurrency market, and lawyers there have been busy helping companies based in the country as well as abroad with everything from raising money through a new digital currency venture, to navigating the changing, and occasionally confusing, regulatory landscape.

South Korea’s cryptocurrency industry is anticipating much better times as the market regulator changes tack from its tough stance on the virtual coin trade, promising instead to help promote blockchain technology.