diff --git a/src/cc/marmara.cpp b/src/cc/marmara.cpp
index 359092ef9..908e3557d 100644
--- a/src/cc/marmara.cpp
+++ b/src/cc/marmara.cpp
@@ -116,9 +116,18 @@ int32_t MarmaraValidateCoinbase(int32_t height,CTransaction tx)
 {
     struct CCcontract_info *cp,C; CPubKey pk; int32_t ht,unlockht; CTxOut ccvout;
     cp = CCinit(&C,EVAL_MARMARA);
-    for (ht=0; ht<10000; ht+=MARMARA_GROUPSIZE/3)
-        fprintf(stderr,"%d ",MarmaraUnlockht(ht));
-    fprintf(stderr,"<- unlock hts\n");
+    int32_t d,histo[365*2];
+    for (ht=2; ht<1000000; ht+=MARMARA_GROUPSIZE)
+    {
+        memset(histo,0,sizeof(histo));
+        d = (MarmaraUnlockht(ht) - ht) / 1440
+        if ( d < 0 || d > sizeof(histo)/sizeof(*histo) )
+            fprintf(stderr,"d error.%d at ht.%d\n",d,ht);
+        else histo[d]++;
+    }
+    for (ht=0; ht<sizeof(histo)/sizeof(*histo); ht++)
+        fprintf(stderr,"%d ",histo[ht]);
+    fprintf(stderr,"<- unlock histogram by days locked\n");
     if ( (height & 1) != 0 )
         return(0);
     if ( tx.vout.size() == 2 && tx.vout[1].nValue == 0 )