French cryptocurrency tax platform Waltio has been targeted by a ransomware attack from the hacker group "Shiny Hunters," potentially compromising the personal data of nearly 50,000 users. The attackers claim to have accessed email addresses and account balances, primarily affecting customers in France. Waltio, known for its portfolio tracking and tax calculation services, has reported the incident to authorities, citing an attempt to extort and compromise its data processing systems.