diff --git a/iguana/dPoW.h b/iguana/dPoW.h
index 1cc62863c..121c9753a 100755
--- a/iguana/dPoW.h
+++ b/iguana/dPoW.h
@@ -22,7 +22,7 @@
 #define DPOW_MINSIGS 7
 //#define DPOW_M(bp) ((bp)->minsigs)  // (((bp)->numnotaries >> 1) + 1)
 #define DPOW_MODIND(bp,offset) (((((bp)->height / DPOW_CHECKPOINTFREQ) % (bp)->numnotaries) + (offset)) % (bp)->numnotaries)
-#define DPOW_VERSION 0x0737
+#define DPOW_VERSION 0x0747
 #define DPOW_UTXOSIZE 10000
 #define DPOW_MINOUTPUT 6000
 #define DPOW_DURATION 300
diff --git a/iguana/dpow/dpow_fsm.c b/iguana/dpow/dpow_fsm.c
index b85f9e26d..7b93d2893 100755
--- a/iguana/dpow/dpow_fsm.c
+++ b/iguana/dpow/dpow_fsm.c
@@ -194,6 +194,11 @@ void dpow_statemachinestart(void *ptr)
             bp->isratify = 1;
             if ( (numratified= cJSON_GetArraySize(ratified)) > 0 )
             {
+                if ( numratified > 64 )
+                {
+                    fprintf(stderr,"cant ratify more than 64 notaries\n");
+                    return;
+                }
                 for (i=0; i<numratified; i++)
                 {
                     item = jitem(ratified,i);