DDoS

DDoS is an abbreviation of "Distributed Denial of Service" and is a type of attack that occurs regularly on the internet.

In this type of attack, a large number of computers distributed over multiple networks send connection requests to a specific computer or network, overwhelming the computer's capacity to communicate and suspending its service.

BitFlyer has excellent security and is protected from DDoS attacks. Please see the bitFlyer security site for more details.