def unchecked_keys(self, key=None, count=None):
        """
        Retrieves unchecked database keys, blocks hashes & a json
        representations of unchecked pending blocks starting from **key** up
        to **count**

        .. version 8.0 required

        :param key: Starting key to return unchecked keys for
        :type key: str

        :param count: Max number of keys/blocks to return
        :type count: int

        :raises: :py:exc:`nano.rpc.RPCException`

        >>> rpc.unchecked_keys(
        ...     key="FA5B51D063BADDF345EFD7EF0D3C5FB115C85B1EF4CDE89D8B7DF3EAF60A04A4",
        ...     count=1
        ... )
        [
            {
                "key": "FA5B51D063BADDF345EFD7EF0D3C5FB115C85B1EF4CDE89D8B7DF3EAF60A04A4",
                "hash": "000D1BAEC8EC208142C99059B393051BAC8380F9B5A2E6B2489A277D81789F3F",
                "contents": {
                    "account": "xrb_3e3j5tkog48pnny9dmfzj1r16pg8t1e76dz5tmac6iq689wyjfpi00000000",
                    "work": "0000000000000000",
                    "source": "FA5B51D063BADDF345EFD7EF0D3C5FB115C85B1EF4CDE89D8B7DF3EAF60A04A4",
                    "representative": "xrb_3e3j5tkog48pnny9dmfzj1r16pg8t1e76dz5tmac6iq689wyjfpi00000000",
                    "signature": "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
                    "type": "open"
                }
            }
        ]

        """

        payload = {}

        if key:
            payload['key'] = self._process_value(key, 'publickey')

        if count is not None:
            payload['count'] = self._process_value(count, 'int')

        resp = self.call('unchecked_keys', payload)
        unchecked = resp.get('unchecked') or []

        for entry in unchecked:
            entry['contents'] = json.loads(entry['contents'])

        return unchecked