When trying to regain access to your Kraken account, you may be asked to jump on a video call with a support agent to prove you are actually who you say you are.

Last month, the centralized exchange said it caught someone wearing a Halloween-style rubber mask attempting to fool the worker on the other side of the call—but it didn’t work.

The attacker had raised a number of red flags during the first round of checks, such as failing to name the assets that the account held. These flags caused the agent working the case to require a video call to grant access to the account. During the call, the Kraken worker asked some more questions and checked the person’s ID.