diff --git a/iguana/dPoW.h b/iguana/dPoW.h
index 29c0bba9e..4ee29322e 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 0x0556
+#define DPOW_VERSION 0x0577
 #define DPOW_UTXOSIZE 10000
 #define DPOW_MINOUTPUT 6000
 #define DPOW_DURATION 300
@@ -62,7 +62,7 @@ struct dpow_utxoentry
 struct dpow_entry
 {
     bits256 commit,beacon;
-    uint64_t masks[2][DPOW_MAXRELAYS],recvmask,othermask;
+    uint64_t masks[2][DPOW_MAXRELAYS],recvmask,othermask,bestmask;
     int32_t height;
     int8_t bestk;
     uint8_t pubkey[33];
@@ -99,7 +99,7 @@ struct dpow_block
     uint64_t recvmask,bestmask;
     struct dpow_entry notaries[DPOW_MAXRELAYS];
     uint32_t state,timestamp,waiting,sigcrcs[2],txidcrcs[2],utxocrcs[2];
-    int32_t height,numnotaries,completed,minsigs,duration,numratified,isratify,require0;
+    int32_t height,numnotaries,completed,minsigs,duration,numratified,isratify,require0,scores[DPOW_MAXRELAYS];
     int8_t bestk;
     cJSON *ratified;
     uint8_t ratified_pubkeys[DPOW_MAXRELAYS][33]; char handles[DPOW_MAXRELAYS][32];
diff --git a/iguana/dpow/dpow_fsm.c b/iguana/dpow/dpow_fsm.c
index 9e144a4ec..b5342c853 100755
--- a/iguana/dpow/dpow_fsm.c
+++ b/iguana/dpow/dpow_fsm.c
@@ -111,7 +111,7 @@ void dpow_sync(struct supernet_info *myinfo,int32_t forceflag,struct dpow_info *
         dpow_signedtxgen(myinfo,dp,(src_or_dest != 0) ? bp->destcoin : bp->srccoin,bp,lastk,mask,myind,src_or_dest != 0 ? DPOW_SIGBTCCHANNEL : DPOW_SIGCHANNEL,src_or_dest);
 }
 
-int32_t dpow_datahandler(struct supernet_info *myinfo,struct dpow_info *dp,uint32_t channel,uint32_t height,uint8_t *data,int32_t datalen)
+int32_t dpow_datahandler(struct supernet_info *myinfo,struct dpow_info *dp,uint8_t nn_senderind,int8_t nn_bestk,uint64_t nn_bestmask,uint32_t channel,uint32_t height,uint8_t *data,int32_t datalen)
 {
     bits256 txid,commit,srchash,hashmsg; struct dpow_block *bp = 0; uint32_t flag = 0; int32_t src_or_dest,senderind,i,iter,rlen,myind = -1; char str[65],str2[65]; struct dpow_sigentry dsig; struct dpow_entry *ep; struct dpow_coinentry *cp; struct dpow_utxoentry U; struct iguana_info *coin;
     if ( (bp= dpow_heightfind(myinfo,dp,height)) == 0 )
@@ -126,6 +126,7 @@ int32_t dpow_datahandler(struct supernet_info *myinfo,struct dpow_info *dp,uint3
         printf("couldnt find myind height.%d | this means your pubkey for this node is not registered and needs to be ratified by majority vote of all notaries\n",height);
         return(-1);
     }
+    dpow_bestmask_update(myinfo,dp,bp,nn_senderind,nn_bestk,nn_bestmask);
     for (i=0; i<32; i++)
         srchash.bytes[i] = dp->minerkey33[i+1];
     if ( channel == DPOW_ENTRIESCHANNEL )
diff --git a/iguana/dpow/dpow_network.c b/iguana/dpow/dpow_network.c
index 07be1e2b9..7c90e782a 100755
--- a/iguana/dpow/dpow_network.c
+++ b/iguana/dpow/dpow_network.c
@@ -19,9 +19,11 @@
 struct dpow_nanomsghdr
 {
     bits256 srchash,desthash;
+    uint64_t bestmask;
     uint32_t channel,height,size,datalen,crc32,numipbits,ipbits[64];
     char symbol[16];
-    uint8_t version0,version1,packet[];
+    int8_t bestk;
+    uint8_t senderind,version0,version1,packet[];
 } PACKED;
 
 char *nanomsg_tcpname(char *str,char *ipaddr)
@@ -124,6 +126,9 @@ void dpow_send(struct supernet_info *myinfo,struct dpow_info *dp,struct dpow_blo
         size = (int32_t)(sizeof(*np) + datalen);
         np = calloc(1,size); // endian dependent!
         np->numipbits = myinfo->numdpowipbits;
+        np->bestk = bp->bestk;
+        np->bestmask = bp->bestmask;
+        np->senderind = bp->myind;
         memcpy(np->ipbits,myinfo->dpowipbits,myinfo->numdpowipbits * sizeof(*myinfo->dpowipbits));
         //printf("dpow_send.(%d) size.%d numipbits.%d\n",datalen,size,np->numipbits);
         np->size = size;
@@ -201,10 +206,10 @@ void dpow_nanomsg_update(struct supernet_info *myinfo)
                         //char str[65]; printf("%s RECV ht.%d ch.%08x (%d) crc32.%08x:%08x datalen.%d:%d firstz.%d\n",bits256_str(str,np->srchash),np->height,np->channel,size,np->crc32,crc32,np->datalen,(int32_t)(size - sizeof(*np)),firstz);
                          if ( i == myinfo->numdpows )
                             printf("received nnpacket for (%s)\n",np->symbol);
-                        else if ( dpow_datahandler(myinfo,dp,np->channel,np->height,np->packet,np->datalen) >= 0 )
+                        else if ( dpow_datahandler(myinfo,dp,np->senderind,np->bestk,np->bestmask,np->channel,np->height,np->packet,np->datalen) >= 0 )
                             dp->crcs[firstz] = crc32;
                     }
-                } else printf("ignore np->datalen.%d %d (size %d - %ld)\n",np->datalen,(int32_t)(size-sizeof(*np)),size,sizeof(*np));
+                } //else printf("ignore np->datalen.%d %d (size %d - %ld)\n",np->datalen,(int32_t)(size-sizeof(*np)),size,sizeof(*np));
             }
             if ( np != 0 )
                 nn_freemsg(np);
diff --git a/iguana/dpow/dpow_tx.c b/iguana/dpow/dpow_tx.c
index 657229545..4f5c9a4db 100755
--- a/iguana/dpow/dpow_tx.c
+++ b/iguana/dpow/dpow_tx.c
@@ -13,6 +13,26 @@
  *                                                                            *
  ******************************************************************************/
 
+void dpow_bestmask_update(struct supernet_info *myinfo,struct dpow_info *dp,struct dpow_block *bp,uint8_t nn_senderind,int8_t nn_bestk,uint64_t nn_bestmask)
+{
+    if ( nn_senderind < 0 || nn_senderind >= bp->numnotaries )
+        return;
+    bp->notaries[nn_senderind].bestk = nn_bestk;
+    bp->notaries[nn_senderind].bestmask = nn_bestmask;
+    if ( bp->bestk >= 0 )
+    {
+        if ( nn_bestk < 0 )
+            bp->scores[nn_senderind] -= 10;
+        else if ( nn_bestk != bp->bestk )
+            bp->scores[nn_senderind]--;
+        else if ( nn_bestmask != bp->bestmask )
+            bp->scores[nn_senderind]--;
+        else if ( bp->scores[nn_senderind] < 1 )
+            bp->scores[nn_senderind] = 1;
+        else bp->scores[nn_senderind]++;
+    }
+}
+
 uint64_t dpow_lastk_mask(struct dpow_block *bp,int8_t *lastkp)
 {
     int32_t j,m,k; uint64_t mask = bp->require0;
@@ -20,7 +40,9 @@ uint64_t dpow_lastk_mask(struct dpow_block *bp,int8_t *lastkp)
     m = bp->require0;
     for (j=0; j<bp->numnotaries; j++)
     {
-        k = DPOW_MODIND(bp,j);//((bp->height % bp->numnotaries) + j) % bp->numnotaries;
+        k = DPOW_MODIND(bp,j);
+        if ( (bp->require0 == 0 || k != 0) && bp->scores[k] < -100 )
+            continue;
         if ( bits256_nonz(bp->notaries[k].src.prev_hash) != 0 && bits256_nonz(bp->notaries[k].dest.prev_hash) != 0 )
         {
             bp->recvmask |= (1LL << k);
@@ -54,6 +76,8 @@ uint64_t dpow_maskmin(uint64_t refmask,struct dpow_block *bp,int8_t *lastkp)
     for (j=0; j<bp->numnotaries; j++)
     {
         k = DPOW_MODIND(bp,j);
+        if ( (bp->require0 == 0 || k != 0) && bp->scores[k] < -100 )
+            continue;
         if ( bits256_nonz(bp->notaries[k].src.prev_hash) != 0 && bits256_nonz(bp->notaries[k].dest.prev_hash) != 0 )
         {
             mask |= (1LL << k);
diff --git a/iguana/iguana_notary.c b/iguana/iguana_notary.c
index 4e6a27b83..80aa9bb42 100755
--- a/iguana/iguana_notary.c
+++ b/iguana/iguana_notary.c
@@ -22,7 +22,7 @@
 #include "iguana777.h"
 #include "notaries.h"
 
-int32_t dpow_datahandler(struct supernet_info *myinfo,struct dpow_info *dp,uint32_t channel,uint32_t height,uint8_t *data,int32_t datalen);
+int32_t dpow_datahandler(struct supernet_info *myinfo,struct dpow_info *dp,uint8_t nn_senderind,int8_t bestk,uint64_t bestmask,uint32_t channel,uint32_t height,uint8_t *data,int32_t datalen);
 
 #include "dpow/dpow_network.c"
 #include "dpow/dpow_rpc.c"