diff --git a/lib/coins.py b/lib/coins.py
index ae44b7f..9746b75 100644
--- a/lib/coins.py
+++ b/lib/coins.py
@@ -43,16 +43,22 @@ class Coin(object):
     # Peer discovery
     PEER_DEFAULT_PORTS = {'t': '50001', 's': '50002'}
     PEERS = []
-    TX_COUNT_HEIGHT = 0
 
     @classmethod
     def lookup_coin_class(cls, name, net):
         '''Return a coin class given name and network.
 
         Raise an exception if unrecognised.'''
+        req_attrs = ('TX_COUNT', 'TX_COUNT_HEIGHT', 'TX_PER_BLOCK',
+                     'IRC_CHANNEL', 'IRC_PREFIX')
         for coin in util.subclasses(Coin):
             if (coin.NAME.lower() == name.lower()
                     and coin.NET.lower() == net.lower()):
+                missing = [attr for attr in req_attrs
+                           if not hasattr(coin, attr)]
+                if missing:
+                    raise CoinError('coin {} missing {} attributes'
+                                    .format(name, missing))
                 return coin
         raise CoinError('unknown coin {} and network {} combination'
                         .format(name, net))
diff --git a/server/block_processor.py b/server/block_processor.py
index 9d7d6a6..c8bdd22 100644
--- a/server/block_processor.py
+++ b/server/block_processor.py
@@ -388,27 +388,22 @@ class BlockProcessor(server.db.DB):
             self.logger.info('tx/sec since genesis: {:,d}, '
                              'since last flush: {:,d}'
                              .format(tx_per_sec, this_tx_per_sec))
-            if self.coin.TX_COUNT_HEIGHT > 0:
-                daemon_height = self.daemon.cached_height()
-                if self.height > self.coin.TX_COUNT_HEIGHT:
-                    tx_est = (daemon_height - self.height) * self.coin.TX_PER_BLOCK
-                else:
-                    tx_est = ((daemon_height - self.coin.TX_COUNT_HEIGHT)
-                              * self.coin.TX_PER_BLOCK
-                              + (self.coin.TX_COUNT - self.tx_count))
 
-                # Damp the enthusiasm
-                realism = 2.0 - 0.9 * self.height / self.coin.TX_COUNT_HEIGHT
-                tx_est *= max(realism, 1.0)
-
-
-                self.logger.info('sync time: {}  ETA: {}'
-                                 .format(formatted_time(self.wall_time),
-                                         formatted_time(tx_est / this_tx_per_sec)))
+            daemon_height = self.daemon.cached_height()
+            if self.height > self.coin.TX_COUNT_HEIGHT:
+                tx_est = (daemon_height - self.height) * self.coin.TX_PER_BLOCK
             else:
-                self.logger.info('sync time: {}'
-                                 .format(formatted_time(self.wall_time)))
+                tx_est = ((daemon_height - self.coin.TX_COUNT_HEIGHT)
+                          * self.coin.TX_PER_BLOCK
+                          + (self.coin.TX_COUNT - self.tx_count))
 
+            # Damp the enthusiasm
+            realism = 2.0 - 0.9 * self.height / self.coin.TX_COUNT_HEIGHT
+            tx_est *= max(realism, 1.0)
+
+            self.logger.info('sync time: {}  ETA: {}'
+                             .format(formatted_time(self.wall_time),
+                                     formatted_time(tx_est / this_tx_per_sec)))
 
     def fs_flush(self):
         '''Flush the things stored on the filesystem.'''