def listunspent(
        self,
        address: str="",
        minconf: int=1,
        maxconf: int=999999,
    ) -> list:
        '''list UTXOs
        modified version to allow filtering by address.
        '''
        if address:
            return self.req("listunspent", [minconf, maxconf, [address]])

        return self.req("listunspent", [minconf, maxconf])
list UTXOs
        modified version to allow filtering by address.