do not save blocks that are set for the future

onionr/onionrutils.py

@@ -391,6 +391,9 @@ class OnionrUtils:
                     if not self.isIntegerString(metadata[i]):
                         logger.warn('Block metadata time stamp is not integer string')
                         break
+                    if metadata[i] > self.getEpoch():
+                        logger.warn('Block metadata time stamp is set for the future, which is not allowed.')
+                        break
                 elif i == 'expire':
                     try:
                         assert int(metadata[i]) > self.getEpoch()

onionr/static-data/default_config.json

@@ -6,6 +6,7 @@
         "minimum_send_pow": 5,
         "socket_servers": false,
         "security_level": 0,
+        "max_block_age": 2678400,
         "public_key": ""
     },