The Financial Services Agency conducted a spot inspection on Coincheck Inc. Friday to protect users, Finance Minister Taro Aso said, as authorities tried to pin down how hackers stole about ¥58 billion ($530 million) of digital money from the Tokyo-based cryptocurrency exchange.

Last week's heist — one of the world's biggest cyberthefts — highlighted the vulnerabilities in trading an asset that policymakers are struggling to regulate, as well as the broader economic risks for the country as it aims to leverage the financial technology (fintech) industry to stimulate growth.

The regulator earlier this week issued a business improvement order to Coincheck and said it would investigate all cryptocurrency exchanges in the nation for security gaps following the hack.