diff --git a/tipbot.py b/tipbot.py
index b15d527..81b04f2 100644
--- a/tipbot.py
+++ b/tipbot.py
@@ -334,6 +334,20 @@ def OnCommandProxy(link,cmd):
     log_error('Exception running command %s: %s' % (str(cmd),str(e)))
   link.batch_send_done()
 
+def lower_nick(s,net):
+  news = ""
+  start_idx = s.find(net)
+  if start_idx >= 0:
+    start_idx += len(net)
+    news = s[:start_idx]
+    while start_idx < len(s) and s[start_idx] != ':':
+      news = news + s[start_idx].lower()
+      start_idx += 1
+    news = news + s[start_idx:]
+  else:
+    news = s
+  return news
+
 def MigrateRedis():
   balances=redis_hgetall('balances')
   for balance in balances:
@@ -374,6 +388,42 @@ def MigrateRedis():
         log_info('copying %s to %s' % (key,altkey))
         redisdb.restore(altkey,0,redisdb.dump(key))
 
+  keys=redisdb.keys()
+  for key in keys:
+    if key.find("freenode:") >= 0 and not key.endswith("freenode:"):
+      altkey=lower_nick(key,"freenode:")
+      if altkey == key:
+        continue
+      for ck in keys:
+        if key != ck and lower_nick(ck,"freenode:")==altkey:
+          log_error('Found two congruent keys: %s and %s' % (key,ck))
+          exit()
+      log_info('renaming %s to %s' % (key,altkey))
+      redisdb.restore(altkey,0,redisdb.dump(key))
+      redisdb.delete(key)
+  for hashname in ['balances','paymentid','bookie:1','password','dice:serverseed','dice:playerseed','blackjack:serverseed','blackjack:playerseed']:
+    entries=redis_hgetall(hashname)
+    for k in entries.keys():
+      v=entries[k]
+      if v.find("freenode:") >= 0 and not v.endswith("freenode:"):
+        altv=lower_nick(v,"freenode:")
+        if altv == v:
+          continue
+        log_info('changing %s:%s value %s to %s' % (hashname,k,v,altv))
+        redis_hset(hashname,k,altv)
+
+      if k.find("freenode:") >= 0 and not k.endswith("freenode:"):
+        altkey=lower_nick(k,"freenode:")
+        if altkey == k:
+          continue
+        for ck in keys:
+          if k != ck and lower_nick(ck,"freenode:")==altkey:
+            log_error('Found two congruent keys in %s: %s and %s' % (hashname,k,ck))
+            exit()
+        log_info('renaming %s key %s to %s' % (hashname,k,altkey))
+        redisdb.hset(hashname,altkey,redis_hget(hashname,k))
+        redisdb.hdel(hashname,k)
+
 RegisterCommands()
 redisdb = connect_to_redis(config.redis_host,config.redis_port)
 MigrateRedis()
diff --git a/tipbot/link.py b/tipbot/link.py
index 1e048e8..bb3e7ff 100644
--- a/tipbot/link.py
+++ b/tipbot/link.py
@@ -17,7 +17,7 @@ class Link:
     self.user=user
     self.group=group
     self.data=data
-    self.identity_string = self.network.name+":"+self.user.nick
+    self.identity_string = self.network.name+":"+network.canonicalize(self.user.nick)
     self.batch_message = None
     self.batch_message_private = None
 
diff --git a/tipbot/modules/irc.py b/tipbot/modules/irc.py
index 16d5093..15258aa 100644
--- a/tipbot/modules/irc.py
+++ b/tipbot/modules/irc.py
@@ -87,6 +87,9 @@ class IRCNetwork(Network):
   def is_identified(self,link):
     return link.identity() in self.registered_users
 
+  def canonicalize(self,nick):
+    return nick.lower()
+
   def join(self,chan):
     self._irc_sendmsg('JOIN '+chan)
 
diff --git a/tipbot/network.py b/tipbot/network.py
index 92a19f8..dda1a5a 100644
--- a/tipbot/network.py
+++ b/tipbot/network.py
@@ -51,6 +51,9 @@ class Network:
   def update_users_list(self,group_name=None):
     pass
 
+  def canonicalize(self,name):
+    return name
+
   def update(self):
     return True