code: def eth_getStorageAt(self, address=None, position=0, block=BLOCK_TAG_LATEST):
          
          block = validate_block(block)
          return self._call("eth_getStorageAt", [address, hex(position), block])
docs: TODO: documentation
  
          https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getstorageat
  
          TESTED