blocktrail / blocktrail-sdk-php

            throw new \InvalidArgumentException("Can't store Primary Mnemonic on server without a passphrase");

        }

        if ($primaryPrivateKey) {

            if (is_string($primaryPrivateKey)) {

                $primaryPrivateKey = [$primaryPrivateKey, "m"];

            }

        } else {

            $primaryPrivateKey = HierarchicalKeyFactory::fromEntropy((new Bip39SeedGenerator())->getSeed($primaryMnemonic, $options['passphrase']));

        }

        if (!$storePrimaryMnemonic) {

            $primaryMnemonic = false;

            $backupPublicKey = $options['backup_public_key'];

        }

        if ($backupPublicKey) {

            if (is_string($backupPublicKey)) {

                $backupPublicKey = [$backupPublicKey, "m"];

            }

        } else {

            $backupPrivateKey = HierarchicalKeyFactory::fromEntropy((new Bip39SeedGenerator())->getSeed($backupMnemonic, ""));

            $backupPublicKey = BIP32Key::create($backupPrivateKey->toPublic(), "M");

        }

        // create a checksum of our private key which we'll later use to verify we used the right password

        $checksum = $primaryPrivateKey->getPublicKey()->getAddress()->getAddress();