protected function newV1BackupSeed() {
        list($backupMnemonic, $backupSeed, $backupPrivateKey) = $this->generateNewSeed("");

        return [$backupMnemonic, $backupSeed, $backupPrivateKey];
    }
protected function newV1BackupSeed() {
        list($backupMnemonic, $backupSeed, $backupPrivateKey) = $this->generateNewSeed("");

        return [$backupMnemonic, $backupSeed, $backupPrivateKey];
    }
protected function newV1BackupSeed ( ) { list ( $ backupMnemonic , $ backupSeed , $ backupPrivateKey ) = $ this -> generateNewSeed ( "" ) ; return [ $ backupMnemonic , $ backupSeed , $ backupPrivateKey ] ; }
create new backup key;
1) a BIP39 mnemonic
2) a seed from that mnemonic with a blank password
3) a private key from that seed

@return array [mnemonic, seed, key]
create new backup key ; 1 ) a BIP39 mnemonic 2 ) a seed from that mnemonic with a blank password 3 ) a private key from that seed