Captcha vs DPRK: protecting Binance from a DDoS attack

Amid reports of North Korean hackers' involvement in the Binance exchange hack, developers have created a unique verification system.

The new captcha identifies users from North Korea with a 99.9% probability. The test logic is based on patriotism: a loyal citizen cannot pass the check.

The launch of this unconventional protection method was accompanied by an ironic twist. Almost immediately after implementation, the site came under a powerful DDoS attack.