Digital currency operators and Bitcoin exchanges are the most common targets of distributed denial of service (DDoS) attacks according to a report titled “Q3 2017 Global DDoS Threat Landscape.”
Imperva Incapsula said that three out of four Bitcoin sites were victims of DDoS attacks in the third quarter of 2017 alone. A DDoS attack happens when multiple users flood the bandwidth or resource of a targeted system with traffic, thus disallowing legitimate parties to access the site or service.