Wu Blockchain: Bithumb, South Korea's second-largest crypto exchange, suffered an internal system breach, leading to the exposure of data for 6,444 customers and 715 employees. Bithumb disclosed that its internal corporate groupware (DaouOffice) was subjected to an unauthorized external intrusion for approximately one hour on October 27, resulting in the theft of personal data belonging to 6,444 customers. The leaked records include names, mobile phone numbers, resident registration numbers, bank account numbers, and copies of identification documents. Data for 844 customers was directly exposed, while another 5,600 records remained encrypted and unread. Additionally, records for 715 employees and external personnel were also affected. Bithumb emphasized that the compromised groupware is completely isolated from core trading operations and asset databases, ensuring customer funds remain secure. The exchange has notified authorities and pledged full compensation for any verified losses incurred as a result of the incident.