/**
* get the plain public key for the current BIP32 key
*
* @return string
*/
public function publicKey()
{
// if this is a BIP32 Private key then we first build the public key
// that way it will be cached nicely
if (!$this->path->isPublicPath()) {
return $this->buildKey($this->path->publicPath())->publicKey();
} else {
if (is_null($this->publicKey)) {
$this->publicKey = BIP32::extract_public_key($this->tuple());
}
return $this->publicKey;
}
}
