To increase blockchain privacy, we've got five passwords for a wallet that's in PDF. If one of the algebra passwords is lost, we can change the wallet pdf with the rest and get a new one. In many cases we lose our PDF then somehow our wallet or account gets hacked. In this case, if we process verification through mail and mobile for recovery, this system can create an easy means of recovery, then our wallet account will not be lost and damaged. Best of luck to you.