We do not verify this.
If the benefactor does not log into DieFI for a default period of 12 months (the benefactor can change this period to ie. 6 months or 36 months), we give the chosen beneficiaries access to all of the benefactor's information and key.
So basically, the benefactor does not need to be dead to trigger the “Dead man's switch”. He could fail to log in, ie. if he lost his memory or another emergency occurred.