/**
* get a new BIP32 derivation for the next (unused) address
* by requesting it from the API
*
* @return string
* @throws \Exception
*/
protected function getNewDerivation()
{
$path = $this->walletPath->path()->last("*");
if (self::VERIFY_NEW_DERIVATION) {
$new = $this->sdk->_getNewDerivation($this->identifier, (string) $path);
$path = $new['path'];
$address = $new['address'];
$redeemScript = $new['redeem_script'];
list($checkAddress, $checkRedeemScript) = $this->getRedeemScriptByPath($path);
if ($checkAddress != $address) {
throw new \Exception("Failed to verify that address from API [{$address}] matches address locally [{$checkAddress}]");
}
if ($checkRedeemScript != $redeemScript) {
throw new \Exception("Failed to verify that redeemScript from API [{$redeemScript}] matches address locally [{$checkRedeemScript}]");
}
} else {
$path = $this->sdk->getNewDerivation($this->identifier, (string) $path);
}
return (string) $path;
}
