diff --git a/gecko/gecko.c b/gecko/gecko.c
index cfb88c1f3..cd7667089 100755
--- a/gecko/gecko.c
+++ b/gecko/gecko.c
@@ -181,7 +181,7 @@ struct iguana_info *basilisk_geckochain(struct supernet_info *myinfo,char *symbo
         serialized = get_dataptr(BASILISK_HDROFFSET,&ptr,&datalen,hexbuf,sizeof(hexbuf),hexstr);
         iguana_chaininit(myinfo,virt->chain,1,valsobj);
         virt->chain->isPoS = 1;
-        hdrsize = (virt->chain->zcash != 0) ? sizeof(struct iguana_msgblockhdr_zcash) : sizeof(struct iguana_msgblockhdr);
+        hdrsize = (virt->chain->zcash != 0) ? sizeof(struct iguana_msgzblockhdr) : sizeof(struct iguana_msgblockhdr);
         if ( gecko_blocknonce_verify(virt,serialized,hdrsize,virt->chain->nBits,0,0) > 0 )
         {
             virt->chain->genesishash2 = iguana_calcblockhash(symbol,virt->chain->hashalgo,serialized,hdrsize);
diff --git a/gecko/gecko_blocks.c b/gecko/gecko_blocks.c
index 29efe1842..db59a3a61 100755
--- a/gecko/gecko_blocks.c
+++ b/gecko/gecko_blocks.c
@@ -312,7 +312,7 @@ char *basilisk_respond_geckoblock(struct supernet_info *myinfo,char *CMD,void *a
             printf("REJECT: duplicate block %s\n",bits256_str(str,hash2));
             return(clonestr("{\"error\":\"duplicate block rejected\"}"));
         }
-        hdrsize = (virt->chain->zcash != 0) ? sizeof(struct iguana_msgblockhdr_zcash) : sizeof(struct iguana_msgblockhdr);
+        hdrsize = (virt->chain->zcash != 0) ? sizeof(struct iguana_msgzblockhdr) : sizeof(struct iguana_msgblockhdr);
         //nBits = gecko_nBits(virt,&prevtimestamp,(struct iguana_block *)&virt->blocks.hwmchain,GECKO_DIFFITERS);
         //if ( gecko_blocknonce_verify(virt,data,hdrsize,nBits,virt->blocks.hwmchain.RO.timestamp,prevtimestamp) > 0 )
         {
diff --git a/iguana/coins/genkmd b/iguana/coins/genkmd
index b1b9aceb5..877ee50fe 100755
--- a/iguana/coins/genkmd
+++ b/iguana/coins/genkmd
@@ -1,2 +1,2 @@
-curl --url "http://127.0.0.1:7778" --data "{\"unitval\":\"20\",\"zcash\":1,\"RELAY\":1,\"VALIDATE\":1,\"prefetchlag\":-1,\"poll\":10,\"active\":1,\"agent\":\"iguana\",\"method\":\"addcoin\",\"startpend\":8,\"endpend\":8,\"services\":129,\"maxpeers\":32,\"newcoin\":\"KMD\",\"name\":\"Komodo\",\"hasheaders\":1,\"useaddmultisig\":0,\"netmagic\":\"6df6e755\",\"p2p\":18333,\"rpc\":18332,\"pubval\":111,\"p2shval\":196,\"wifval\":239,\"txfee_satoshis\":\"10000\",\"isPoS\":0,\"minoutput\":10000,\"minconfirms\":2,\"genesishash\":\"27d1f4ce03fc473c9dd6e1e307c682c8f802eae1f5a2f61402aa1ae8702ed3b6\",\"protover\":70002,\"genesisblock\":\"0100000000000000000000000000000000000000000000000000000000000000000000003ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4adae5494dffff7f200000000000000000000000000000000000000000000000000000000000000000209d0900001dc600004fba000024e20100e5660000778100007e190100222f0100720e000056e50100eb12010089920100583d00002e660000844e01001bfe0100cf0c0000892a0000f5230000f9680000976e00009b7b000046770000afd80100bd0d000057650000048f000082b100006a2500004e0601006fef000048410100\"}"
+curl --url "http://127.0.0.1:7778" --data "{\"unitval\":\"20\",\"zcash\":1,\"RELAY\":1,\"VALIDATE\":1,\"prefetchlag\":-1,\"poll\":10,\"active\":1,\"agent\":\"iguana\",\"method\":\"addcoin\",\"startpend\":8,\"endpend\":8,\"services\":129,\"maxpeers\":32,\"newcoin\":\"KMD\",\"name\":\"Komodo\",\"hasheaders\":1,\"useaddmultisig\":0,\"netmagic\":\"f9eee48d\",\"p2p\":7770,\"rpc\":7771,\"pubval\":60,\"p2shval\":85,\"wifval\":188,\"txfee_satoshis\":\"10000\",\"isPoS\":0,\"minoutput\":10000,\"minconfirms\":2,\"genesishash\":\"027e3758c3a65b12aa1046462b486d0a63bfa1beae327897f56c5cfb7daaae71\",\"protover\":170002,\"genesisblock\":\"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\",\"debug\":1}"
 
diff --git a/iguana/confs/KMD_peers.txt b/iguana/confs/KMD_peers.txt
new file mode 100644
index 000000000..816f4ffa1
--- /dev/null
+++ b/iguana/confs/KMD_peers.txt
@@ -0,0 +1,3 @@
+176.9.26.39
+5.9.102.210
+78.47.196.146
diff --git a/iguana/iguana_blocks.c b/iguana/iguana_blocks.c
index c6be59e18..f12864b60 100755
--- a/iguana/iguana_blocks.c
+++ b/iguana/iguana_blocks.c
@@ -19,47 +19,71 @@
 
 void iguana_blockconv(uint8_t zcash,uint8_t auxpow,struct iguana_block *dest,struct iguana_msgblock *msg,bits256 hash2,int32_t height) //uint32_t numtxids,uint32_t numunspents,uint32_t numspends,double PoW)
 {
-    int32_t i;
-    memset(dest,0,sizeof(*dest));
-    dest->RO.version = msg->H.version;
-    dest->RO.prev_block = msg->H.prev_block;
-    dest->RO.merkle_root = msg->H.merkle_root;
-    dest->RO.timestamp = msg->H.timestamp;
-    dest->RO.bits = msg->H.bits;
-    dest->RO.txn_count = msg->txn_count;
-    dest->height = height;
-    dest->RO.hash2 = hash2;
+    int32_t i; struct iguana_zblock *zdest; struct iguana_msgzblock *zmsg;
     if ( zcash == 0 )
+    {
+        memset(dest,0,sizeof(*dest));
+        dest->RO.version = msg->H.version;
+        dest->RO.prev_block = msg->H.prev_block;
+        dest->RO.merkle_root = msg->H.merkle_root;
+        dest->RO.timestamp = msg->H.timestamp;
+        dest->RO.bits = msg->H.bits;
+        dest->RO.txn_count = msg->txn_count;
+        dest->height = height;
+        dest->RO.hash2 = hash2;
         dest->RO.nonce = msg->H.nonce;
+    }
     else
     {
-        dest->RO.allocsize = (int32_t)(sizeof(*dest) + sizeof(*dest->zRO));
-        dest->zRO[0].bignonce = msg->zH.bignonce;
+        zdest = (void *)dest;
+        zmsg = (void *)msg;
+        zdest->RO.allocsize = (int32_t)sizeof(struct iguana_zblock);
+        zdest->RO.version = zmsg->zH.version;
+        zdest->RO.prev_block = zmsg->zH.prev_block;
+        zdest->RO.merkle_root = zmsg->zH.merkle_root;
+        zdest->RO.timestamp = zmsg->zH.timestamp;
+        zdest->RO.bits = zmsg->zH.bits;
+        zdest->zRO.bignonce = zmsg->zH.bignonce;
+        if ( iguana_rwvarint32(0,zmsg->zH.var_numelements,&zdest->zRO.numelements) != sizeof(zmsg->zH.var_numelements) )
+            printf("unexpected varint size for zmsg.zH.numelements <- %d\n",zdest->zRO.numelements);
         for (i=0; i<ZCASH_SOLUTION_ELEMENTS; i++)
-            dest->zRO[0].solution[i] = msg->zH.solution[i];
+            zdest->zRO.solution[i] = zmsg->zH.solution[i];
     }
 }
 
 void iguana_blockunconv(uint8_t zcash,uint8_t auxpow,struct iguana_msgblock *msg,struct iguana_block *src,int32_t cleartxn_count)
 {
-    int32_t i;
-    memset(msg,0,sizeof(*msg));
-    msg->H.version = src->RO.version;
-    msg->H.prev_block = src->RO.prev_block;
-    msg->H.merkle_root = src->RO.merkle_root;
-    msg->H.timestamp = src->RO.timestamp;
-    msg->H.bits = src->RO.bits;
-    if ( zcash == 0 )
-        msg->H.nonce = src->RO.nonce;
+    int32_t i; struct iguana_msgzblock *zmsg; struct iguana_zblock *zsrc;
+    if ( zcash != 0 )
+    {
+        zmsg = (void *)msg;
+        zsrc = (void *)src;
+        memset(zmsg,0,sizeof(*zmsg));
+        zmsg->zH.version = zsrc->RO.version;
+        zmsg->zH.prev_block = zsrc->RO.prev_block;
+        zmsg->zH.merkle_root = zsrc->RO.merkle_root;
+        zmsg->zH.timestamp = zsrc->RO.timestamp;
+        zmsg->zH.bits = zsrc->RO.bits;
+        zmsg->zH.bignonce = zsrc->zRO.bignonce;
+        if ( iguana_rwvarint32(1,zmsg->zH.var_numelements,&zsrc->zRO.numelements) != sizeof(zmsg->zH.var_numelements) )
+            printf("unexpected varint size for zmsg.zH.numelements <- %d\n",zsrc->zRO.numelements);
+        for (i=0; i<zsrc->zRO.numelements; i++)
+            zmsg->zH.solution[i] = zsrc->zRO.solution[i];
+        if ( cleartxn_count == 0 )
+            zmsg->txn_count = src->RO.txn_count;
+    }
     else
     {
-        msg->zH.bignonce = src->zRO[0].bignonce;
-        msg->zH.numelements = ZCASH_SOLUTION_ELEMENTS;
-        for (i=0; i<ZCASH_SOLUTION_ELEMENTS; i++)
-            msg->zH.solution[i] = src->zRO[0].solution[i];
+        memset(msg,0,sizeof(*msg));
+        msg->H.version = src->RO.version;
+        msg->H.prev_block = src->RO.prev_block;
+        msg->H.merkle_root = src->RO.merkle_root;
+        msg->H.timestamp = src->RO.timestamp;
+        msg->H.bits = src->RO.bits;
+        msg->H.nonce = src->RO.nonce;
+        if ( cleartxn_count == 0 )
+            msg->txn_count = src->RO.txn_count;
     }
-    if ( cleartxn_count == 0 )
-        msg->txn_count = src->RO.txn_count;
 }
 
 void iguana_blockcopy(uint8_t zcash,uint8_t auxpow,struct iguana_info *coin,struct iguana_block *block,struct iguana_block *origblock)
@@ -102,9 +126,12 @@ void iguana_blockcopy(uint8_t zcash,uint8_t auxpow,struct iguana_info *coin,stru
             printf("missing space for zcash block.%d origblock.%d\n",block->RO.allocsize,origblock->RO.allocsize);
         else
         {
-            block->zRO[0].bignonce = origblock->zRO[0].bignonce;
+            struct iguana_zblock *zblock = (void *)block;
+            struct iguana_zblock *origzblock = (void *)origblock;
+            zblock->zRO.bignonce = origzblock->zRO.bignonce;
+            zblock->zRO.numelements = origzblock->zRO.numelements;
             for (i=0; i<ZCASH_SOLUTION_ELEMENTS; i++)
-                block->zRO[0].solution[i] = origblock->zRO[0].solution[i];
+                zblock->zRO.solution[i] = origzblock->zRO.solution[i];
         }
     }
 }
@@ -298,7 +325,7 @@ int32_t iguana_blocksizecheck(char *debugstr,uint8_t zcash,struct iguana_block *
 
 int32_t iguana_blockROsize(uint8_t zcash)
 {
-    return((int32_t)(sizeof(struct iguana_blockRO) + zcash*sizeof(struct iguana_msgblockhdr_zcash)));
+    return((int32_t)(sizeof(struct iguana_blockRO) + zcash*sizeof(struct iguana_msgzblockhdr)));
 }
 
 void *iguana_blockzcopyRO(uint8_t zcash,struct iguana_blockRO *dest,int32_t desti,struct iguana_blockRO *src,int32_t srci)
@@ -328,6 +355,11 @@ void iguana_blockzcopy(uint8_t zcash,struct iguana_block *dest,struct iguana_blo
 int32_t iguana_blockvalidate(struct supernet_info *myinfo,struct iguana_info *coin,int32_t *validp,struct iguana_block *block,int32_t dispflag)
 {
     bits256 hash2; uint8_t serialized[sizeof(struct iguana_msgblock) + 4096];
+    if ( coin->chain->debug != 0 )
+    {
+        *validp = 1;
+        return(0);
+    }
     *validp = 0;
     iguana_serialize_block(myinfo,coin->chain,&hash2,serialized,block);
     *validp = (memcmp(hash2.bytes,block->RO.hash2.bytes,sizeof(hash2)) == 0);
diff --git a/iguana/iguana_chains.c b/iguana/iguana_chains.c
index 9a9ba9623..b9bea8d55 100755
--- a/iguana/iguana_chains.c
+++ b/iguana/iguana_chains.c
@@ -341,6 +341,7 @@ void iguana_chainparms(struct supernet_info *myinfo,struct iguana_chain *chain,c
                 chain->rpcport = 14632;
         }
         chain->zcash = juint(argjson,"zcash");
+        chain->debug = juint(argjson,"debug");
         if ( (chain->normal_txversion= juint(argjson,"normal_txversion")) == 0 )
             chain->normal_txversion = IGUANA_NORMAL_TXVERSION;
         if ( (chain->locktime_txversion= juint(argjson,"locktime_txversion")) == 0 )
@@ -433,7 +434,7 @@ void iguana_chainparms(struct supernet_info *myinfo,struct iguana_chain *chain,c
             if ( (hexstr= jstr(argjson,"genesisblock")) != 0 )
             {
                 uint8_t hexbuf[1024],*ptr,*data; int32_t datalen,hdrsize;
-                hdrsize = chain->zcash != 0 ? sizeof(struct iguana_msgblockhdr_zcash) : sizeof(struct iguana_msgblockhdr);
+                hdrsize = chain->zcash != 0 ? sizeof(struct iguana_msgzblockhdr) : sizeof(struct iguana_msgblockhdr);
                 chain->genesis_hex = clonestr(hexstr);
                 data = get_dataptr(BASILISK_HDROFFSET,&ptr,&datalen,hexbuf,sizeof(hexbuf),hexstr);
                 chain->genesishash2 = iguana_calcblockhash(chain->symbol,chain->hashalgo,data,hdrsize);
diff --git a/iguana/iguana_init.c b/iguana/iguana_init.c
index 8b6cb8cc2..2944f7a1b 100755
--- a/iguana/iguana_init.c
+++ b/iguana/iguana_init.c
@@ -92,7 +92,7 @@ void iguana_initcoin(struct iguana_info *coin,cJSON *argjson)
 
 bits256 iguana_genesis(struct supernet_info *myinfo,struct iguana_info *coin,struct iguana_chain *chain)
 {
-    struct iguana_block *block,*ptr; struct iguana_msgblock msg; bits256 hash2; char str[65],str2[65]; uint8_t buf[8192],blockspace[sizeof(*block)+sizeof(*block->zRO)]; int32_t height,auxback;
+    struct iguana_block *block,*ptr; struct iguana_msgblock msg; bits256 hash2; char str[65],str2[65]; uint8_t buf[8192],blockspace[sizeof(*block)+sizeof(struct iguana_zblock)]; int32_t height,auxback;
     if ( coin == 0 || chain == 0 )
         return(GENESIS_PUBKEY);
     block = (void *)blockspace;
@@ -112,19 +112,21 @@ bits256 iguana_genesis(struct supernet_info *myinfo,struct iguana_info *coin,str
     coin->chain->auxpow = auxback;
     if  ( coin->virtualchain == 0 && coin->MAXPEERS > 1 )
     {
-        if ( memcmp(hash2.bytes,chain->genesis_hashdata,sizeof(hash2)) != 0 )
+        if ( coin->chain->debug == 0 && memcmp(hash2.bytes,chain->genesis_hashdata,sizeof(hash2)) != 0 )
         {
             bits256_str(str,hash2);
             printf("genesis mismatch? zcash.%d calculated %s vs %s\n",coin->chain->zcash,str,bits256_str(str2,*(bits256 *)chain->genesis_hashdata));
-            memcpy(hash2.bytes,chain->genesis_hashdata,sizeof(hash2));
         }
+        memcpy(hash2.bytes,chain->genesis_hashdata,sizeof(hash2));
     } else memcpy(hash2.bytes,chain->genesis_hashdata,sizeof(hash2));
     bits256_str(str,hash2);
     printf("genesis.(%s) zcash.%d len.%d hash.%s\n",chain->genesis_hex,coin->chain->zcash,(int32_t)sizeof(msg.H),str);
     iguana_blockconv(coin->chain->zcash,coin->chain->auxpow,block,&msg,hash2,0);
     block->RO.txn_count = 1;
     block->RO.numvouts = 1;
-    block->RO.allocsize = (int32_t)(sizeof(*block) + coin->chain->zcash*sizeof(*block->zRO));
+    if ( coin->chain->zcash != 0 )
+        block->RO.allocsize = sizeof(struct iguana_zblock);
+    else block->RO.allocsize = (int32_t)sizeof(*block);
     iguana_gotdata(coin,0,0);
     if ( (ptr= iguana_blockhashset("genesis0",coin,0,hash2,1)) != 0 )
     {
@@ -294,10 +296,10 @@ void iguana_parseline(struct supernet_info *myinfo,struct iguana_info *coin,int3
     {
         j = (int32_t)strlen(line) - 1;
         line[j] = 0;
-        //printf("parse line.(%s) maxpeers.%d\n",line,coin->MAXPEERS);
+        printf("parse line.(%s) maxpeers.%d\n",line,coin->MAXPEERS);
         if ( iter == 0 )
         {
-            if ( (rand() % 2) == 0 && (m < 32 || m < coin->MAXPEERS/2) )//&& m < 77.7 )
+            if ( (m < 8 || (rand() % 2) == 0) && (m < 32 || m < coin->MAXPEERS/2) )//&& m < 77.7 )
             {
                 if ( 0 && m == 0 )
                 {
@@ -309,7 +311,7 @@ void iguana_parseline(struct supernet_info *myinfo,struct iguana_info *coin,int3
 #ifndef IGUANA_DISABLEPEERS
                 addr = &coin->peers->active[m++];
                 iguana_initpeer(coin,addr,(uint32_t)calc_ipbits(line));
-                //printf("call initpeer.(%s)\n",addr->ipaddr);
+                printf("call initpeer.(%s)\n",addr->ipaddr);
                 iguana_launch(coin,"connection",iguana_startconnection,addr,IGUANA_CONNTHREAD);
 #endif
             }
diff --git a/iguana/iguana_msg.c b/iguana/iguana_msg.c
index e851c4ed8..df75b33f9 100755
--- a/iguana/iguana_msg.c
+++ b/iguana/iguana_msg.c
@@ -101,31 +101,42 @@ int32_t iguana_rwzsolution(int32_t rwflag,uint8_t *serialized,uint32_t *solution
 
 int32_t iguana_rwblockhdr(int32_t rwflag,uint8_t zcash,uint8_t *serialized,struct iguana_msgblock *msg)
 {
-    uint32_t tmp; int32_t len = 0;
-    len += iguana_rwnum(rwflag,&serialized[len],sizeof(msg->H.version),&msg->H.version);
-    len += iguana_rwbignum(rwflag,&serialized[len],sizeof(msg->H.prev_block),msg->H.prev_block.bytes);
-    len += iguana_rwbignum(rwflag,&serialized[len],sizeof(msg->H.merkle_root),msg->H.merkle_root.bytes);
-    len += iguana_rwnum(rwflag,&serialized[len],sizeof(msg->H.timestamp),&msg->H.timestamp);
-    len += iguana_rwnum(rwflag,&serialized[len],sizeof(msg->H.bits),&msg->H.bits);
+    uint32_t tmp; struct iguana_msgzblock *zmsg; int32_t len = 0;
     if ( zcash == 0 )
+    {
+        len += iguana_rwnum(rwflag,&serialized[len],sizeof(msg->H.version),&msg->H.version);
+        len += iguana_rwbignum(rwflag,&serialized[len],sizeof(msg->H.prev_block),msg->H.prev_block.bytes);
+        len += iguana_rwbignum(rwflag,&serialized[len],sizeof(msg->H.merkle_root),msg->H.merkle_root.bytes);
+        len += iguana_rwnum(rwflag,&serialized[len],sizeof(msg->H.timestamp),&msg->H.timestamp);
+        len += iguana_rwnum(rwflag,&serialized[len],sizeof(msg->H.bits),&msg->H.bits);
         len += iguana_rwnum(rwflag,&serialized[len],sizeof(msg->H.nonce),&msg->H.nonce);
+    }
     else
     {
-        len += iguana_rwbignum(rwflag,&serialized[len],sizeof(msg->zH.bignonce),msg->zH.bignonce.bytes);
+        zmsg = (void *)msg;
+        len += iguana_rwnum(rwflag,&serialized[len],sizeof(zmsg->zH.version),&zmsg->zH.version);
+        len += iguana_rwbignum(rwflag,&serialized[len],sizeof(zmsg->zH.prev_block),zmsg->zH.prev_block.bytes);
+        len += iguana_rwbignum(rwflag,&serialized[len],sizeof(zmsg->zH.merkle_root),zmsg->zH.merkle_root.bytes);
+        len += iguana_rwbignum(rwflag,&serialized[len],sizeof(zmsg->zH.reserved),zmsg->zH.reserved.bytes);
+        len += iguana_rwnum(rwflag,&serialized[len],sizeof(zmsg->zH.timestamp),&zmsg->zH.timestamp);
+        len += iguana_rwnum(rwflag,&serialized[len],sizeof(zmsg->zH.bits),&zmsg->zH.bits);
+        len += iguana_rwbignum(rwflag,&serialized[len],sizeof(zmsg->zH.bignonce),zmsg->zH.bignonce.bytes);
         //char str[65]; printf("prev.(%s) len.%d [%d %d %d]\n",bits256_str(str,msg->H.prev_block),len,serialized[len],serialized[len+1],serialized[len+2]);
+        printf("numelements: (%02x %02x %02x)\n",serialized[len],serialized[len+1],serialized[len+2]);
         if ( rwflag != 0 )
-            tmp = msg->zH.numelements;
-        len += iguana_rwvarint32(rwflag,&serialized[len],(uint32_t *)&tmp);
-        if ( rwflag == 0 )
-            msg->zH.numelements = tmp;
-        if ( msg->zH.numelements != ZCASH_SOLUTION_ELEMENTS )
+            memcpy(&serialized[len],zmsg->zH.var_numelements,sizeof(zmsg->zH.var_numelements));
+        else memcpy(zmsg->zH.var_numelements,&serialized[len],sizeof(zmsg->zH.var_numelements));
+        len += sizeof(zmsg->zH.var_numelements);
+        if ( iguana_rwvarint32(rwflag,zmsg->zH.var_numelements,(uint32_t *)&tmp) != sizeof(zmsg->zH.var_numelements) )
+            printf("unexpected varint size for zmsg.zH.numelements <- %d %d %d\n",zmsg->zH.var_numelements[0],zmsg->zH.var_numelements[1],zmsg->zH.var_numelements[2]);
+        if ( tmp != ZCASH_SOLUTION_ELEMENTS )
         {
-            int32_t i; for (i=0; i<157; i++)
-                printf("%02x",serialized[i]);
-            printf(" unexpected ZCASH_SOLUTION_ELEMENTS, got %d vs %d len.%d\n",msg->zH.numelements,ZCASH_SOLUTION_ELEMENTS,len);
+            //int32_t i; for (i=0; i<157; i++)
+            //    printf("%02x",serialized[i]);
+            printf(" unexpected ZCASH_SOLUTION_ELEMENTS, (%02x %02x %02x) expected %d tmp.%d len.%d\n",zmsg->zH.var_numelements[0],zmsg->zH.var_numelements[1],zmsg->zH.var_numelements[2],ZCASH_SOLUTION_ELEMENTS,tmp,len);
             return(-1);
         }
-        len += iguana_rwzsolution(rwflag,&serialized[len],msg->zH.solution,ZCASH_SOLUTION_ELEMENTS);
+        len += iguana_rwzsolution(rwflag,&serialized[len],zmsg->zH.solution,tmp);
     }
     return(len);
 }
@@ -164,7 +175,7 @@ int32_t iguana_eatauxpow(struct supernet_info *myinfo,int32_t rwflag,char *symbo
     return(len);
 }
 
-int32_t iguana_blockhdrsize(char *symbol,uint8_t zcash,uint8_t auxpow)//,uint8_t *serialized,int32_t maxlen)
+int32_t iguana_blockhdrsize(char *symbol,uint8_t zcash,uint8_t auxpow)
 {
     int32_t len = 0;
     if ( zcash == 0 )
@@ -175,7 +186,7 @@ int32_t iguana_blockhdrsize(char *symbol,uint8_t zcash,uint8_t auxpow)//,uint8_t
         return(sizeof(struct iguana_msgblockhdr) + len);
         //else
         return(-1);
-    } else return((int32_t)(sizeof(struct iguana_msgblockhdr) - sizeof(uint32_t) + sizeof(struct iguana_msgblockhdr_zcash) + auxpow*sizeof(bits256)));
+    } else return((int32_t)(sizeof(struct iguana_msgzblockhdr) + auxpow*sizeof(bits256)));
 }
 
 int32_t iguana_rwblock(struct supernet_info *myinfo,char *symbol,uint8_t zcash,uint8_t auxpow,int32_t (*hashalgo)(uint8_t *blockhashp,uint8_t *serialized,int32_t len),int32_t rwflag,bits256 *hash2p,uint8_t *serialized,struct iguana_msgblock *msg,int32_t maxlen)
@@ -183,7 +194,10 @@ int32_t iguana_rwblock(struct supernet_info *myinfo,char *symbol,uint8_t zcash,u
     int32_t len = 0; uint64_t x;
     if ( (len= iguana_rwblockhdr(rwflag,zcash,serialized,msg)) < 0 )
     {
-        printf("error rw.%d blockhdr zcash.%d\n",rwflag,zcash);
+        int32_t i;
+        for (i=0; i<maxlen; i++)
+            printf("%02x",serialized[i]);
+        printf(" error rw.%d blockhdr zcash.%d\n",rwflag,zcash);
         return(-1);
     }
     *hash2p = iguana_calcblockhash(symbol,hashalgo,serialized,len);
@@ -205,29 +219,38 @@ int32_t iguana_rwblock(struct supernet_info *myinfo,char *symbol,uint8_t zcash,u
     return(len);
 }
 
-int32_t iguana_serialize_block(struct supernet_info *myinfo,struct iguana_chain *chain,bits256 *hash2p,uint8_t serialized[sizeof(struct iguana_msgblock)],struct iguana_block *block)
+int32_t iguana_serialize_block(struct supernet_info *myinfo,struct iguana_chain *chain,bits256 *hash2p,uint8_t serialized[sizeof(struct iguana_msgzblock)],struct iguana_block *block)
 {
-    struct iguana_msgblock msg; int32_t i,len;
-    memset(&msg,0,sizeof(msg));
-    msg.H.version = block->RO.version;
-    msg.H.prev_block = block->RO.prev_block;
-    msg.H.merkle_root = block->RO.merkle_root;
-    msg.H.timestamp = block->RO.timestamp;
-    msg.H.bits = block->RO.bits;
+    struct iguana_msgblock msg; struct iguana_zblock *zblock;struct iguana_msgzblock zmsg; int32_t i,len;
     if ( chain->zcash == 0 )
+    {
+        memset(&msg,0,sizeof(msg));
+        msg.H.version = block->RO.version;
+        msg.H.prev_block = block->RO.prev_block;
+        msg.H.merkle_root = block->RO.merkle_root;
+        msg.H.timestamp = block->RO.timestamp;
+        msg.H.bits = block->RO.bits;
         msg.H.nonce = block->RO.nonce;
+        msg.txn_count = block->RO.txn_count;
+        len = iguana_rwblock(myinfo,chain->symbol,chain->zcash,chain->auxpow,chain->hashalgo,1,hash2p,serialized,&msg,IGUANA_MAXPACKETSIZE);
+    }
     else
     {
-        if ( block->RO.allocsize == sizeof(struct iguana_zblock) ) 
-        {
-            msg.zH.bignonce = block->zRO[0].bignonce;
-            msg.zH.numelements = ZCASH_SOLUTION_ELEMENTS;
-            for (i=0; i<ZCASH_SOLUTION_ELEMENTS; i++)
-                msg.zH.solution[i] = block->zRO[0].solution[i];
-        } else printf("iguana_serialize_block has missing zRO\n");
+        memset(&zmsg,0,sizeof(zmsg));
+        zblock = (void *)block;
+        zmsg.zH.version = zblock->RO.version;
+        zmsg.zH.prev_block = zblock->RO.prev_block;
+        zmsg.zH.merkle_root = zblock->RO.merkle_root;
+        zmsg.zH.timestamp = zblock->RO.timestamp;
+        zmsg.zH.bits = zblock->RO.bits;
+        zmsg.zH.bignonce = zblock->zRO.bignonce;
+        if ( iguana_rwvarint32(1,zmsg.zH.var_numelements,(uint32_t *)&zblock->zRO.numelements) != sizeof(zmsg.zH.var_numelements) )
+            printf("unexpected varint size for zmsg.zH.numelements <- %d %d %d\n",zmsg.zH.var_numelements[0],zmsg.zH.var_numelements[1],zmsg.zH.var_numelements[2]);
+        for (i=0; i<ZCASH_SOLUTION_ELEMENTS; i++)
+            zmsg.zH.solution[i] = zblock->zRO.solution[i];
+        msg.txn_count = block->RO.txn_count;
+        len = iguana_rwblock(myinfo,chain->symbol,chain->zcash,chain->auxpow,chain->hashalgo,1,hash2p,serialized,(void *)&zmsg,IGUANA_MAXPACKETSIZE);
     }
-    msg.txn_count = block->RO.txn_count;
-    len = iguana_rwblock(myinfo,chain->symbol,chain->zcash,chain->auxpow,chain->hashalgo,1,hash2p,serialized,&msg,IGUANA_MAXPACKETSIZE);
     return(len);
 }
 
@@ -704,7 +727,7 @@ int32_t iguana_rwtx(struct supernet_info *myinfo,uint8_t zcash,int32_t rwflag,st
 char *iguana_txscan(struct supernet_info *myinfo,struct iguana_info *coin,cJSON *json,uint8_t *data,int32_t recvlen,bits256 txid)
 {
     struct iguana_msgtx tx; bits256 hash2; struct iguana_block *block; struct iguana_msgblock msg;
-    int32_t i,n,len,extralen = 65356; char *txbytes,vpnstr[64]; uint8_t *extraspace,blockspace[sizeof(*block)+sizeof(*block->zRO)];
+    int32_t i,n,len,extralen = 65356; char *txbytes,vpnstr[64]; uint8_t *extraspace,blockspace[sizeof(*block)+sizeof(struct iguana_zblock)];
     block = (void *)blockspace;
     memset(&msg,0,sizeof(msg));
     vpnstr[0] = 0;
@@ -905,11 +928,11 @@ int32_t iguana_msgparser(struct supernet_info *myinfo,struct iguana_info *coin,s
                 memset(&txdata,0,sizeof(txdata));
                 if ( ishost == 0 )
                 {
-                    if ( 0 && coin->chain->auxpow != 0 )
+                    if ( coin->chain->zcash != 0 )
                     {
                         int32_t i; for (i=0; i<recvlen; i++)
                             printf("%02x",data[i]);
-                        printf(" auxblock\n");
+                        printf(" zblock.[%d]\n",recvlen);
                     }
                     addr->msgcounts.block++;
                     if ( (n= iguana_gentxarray(myinfo,coin,rawmem,&txdata,&len,data,recvlen)) == recvlen || n == recvlen-1 )
diff --git a/iguana/iguana_peers.c b/iguana/iguana_peers.c
index ade8d87c3..786cbf96d 100755
--- a/iguana/iguana_peers.c
+++ b/iguana/iguana_peers.c
@@ -737,7 +737,7 @@ void iguana_startconnection(void *arg)
         printf("avoid self-loopback\n");
         return;
     }
-    //printf(">>>>>>>> startconnection.(%s) pending.%u usock.%d addrind.%d\n",addr->ipaddr,addr->pending,addr->usock,addr->addrind);
+    printf(">>>>>>>> startconnection.(%s) pending.%u usock.%d addrind.%d\n",addr->ipaddr,addr->pending,addr->usock,addr->addrind);
     addr->pending = (uint32_t)time(NULL);
     if ( (port= (uint16_t)(addr->ipbits >> 32)) == 0 )
         port = coin->chain->portp2p;
@@ -746,7 +746,7 @@ void iguana_startconnection(void *arg)
     if ( addr->usock < 0 || (coin->peers != 0 && coin->peers->shuttingdown != 0) )
     {
         strcpy(ipaddr,addr->ipaddr);
-        //printf("%s refused PEER KILLED. slot.%d for %s:%d usock.%d\n",coin->symbol,addr->addrind,ipaddr,coin->chain->portp2p,addr->usock);
+        printf("%s refused PEER KILLED. slot.%d for %s:%d usock.%d\n",coin->symbol,addr->addrind,ipaddr,coin->chain->portp2p,addr->usock);
         iguana_iAkill(coin,addr,1);
     }
     else
diff --git a/iguana/iguana_recv.c b/iguana/iguana_recv.c
index 19a5ef7a6..71f87cf03 100755
--- a/iguana/iguana_recv.c
+++ b/iguana/iguana_recv.c
@@ -1303,7 +1303,7 @@ void iguana_checklongestchain(struct iguana_info *coin,struct iguana_bundle *bp,
 
 struct iguana_bundlereq *iguana_recvblockhdrs(struct supernet_info *myinfo,struct iguana_info *coin,struct iguana_bundlereq *req,struct iguana_zblock *zblocks,int32_t n,int32_t *newhwmp)
 {
-    int32_t i,bundlei,match; struct iguana_block *block; bits256 prevhash2; uint8_t serialized[sizeof(struct iguana_msgblock) + sizeof(struct iguana_msgblockhdr_zcash)]; struct iguana_peer *addr; struct iguana_bundle *bp,*firstbp = 0;
+    int32_t i,bundlei,match; struct iguana_block *block; bits256 prevhash2; uint8_t serialized[sizeof(struct iguana_msgblock) + sizeof(struct iguana_msgzblockhdr)]; struct iguana_peer *addr; struct iguana_bundle *bp,*firstbp = 0;
     if ( zblocks == 0 )
     {
         printf("iguana_recvblockhdrs null blocks?\n");
diff --git a/iguana/iguana_tx.c b/iguana/iguana_tx.c
index aafe3de31..28dcdc635 100755
--- a/iguana/iguana_tx.c
+++ b/iguana/iguana_tx.c
@@ -336,7 +336,7 @@ int32_t iguana_peerblockrequest(struct supernet_info *myinfo,struct iguana_info
 
 cJSON *iguana_blockjson(struct supernet_info *myinfo,struct iguana_info *coin,struct iguana_block *block,int32_t txidsflag)
 {
-    char str[65],hexstr[1024]; int32_t i,len,size; struct iguana_txid *tx,T; struct iguana_msgblock msg;
+    char str[65],hexstr[1024]; int32_t i,len,size; struct iguana_txid *tx,T; struct iguana_msgblock msg; struct iguana_msgzblock zmsg; struct iguana_zblock *zblock;
     bits256 hash2,nexthash2; uint8_t serialized[1024]; cJSON *array,*json = cJSON_CreateObject();
     jaddstr(json,"result","success");
     jaddstr(json,"hash",bits256_str(str,block->RO.hash2));
@@ -371,20 +371,34 @@ cJSON *iguana_blockjson(struct supernet_info *myinfo,struct iguana_info *coin,st
     serialized[3] = ((uint8_t *)&block->RO.bits)[0];
     init_hexbytes_noT(hexstr,serialized,sizeof(uint32_t));
     jaddstr(json,"nBitshex",hexstr);
-    memset(&msg,0,sizeof(msg));
-    msg.H.version = block->RO.version;
-    msg.H.merkle_root = block->RO.merkle_root;
-    msg.H.timestamp = block->RO.timestamp;
-    msg.H.bits = block->RO.bits;
     if ( block->RO.allocsize == sizeof(struct iguana_zblock) )
     {
-        msg.zH.bignonce = block->zRO[0].bignonce;
-        msg.zH.numelements = ZCASH_SOLUTION_ELEMENTS;
+        zblock = (void *)block;
+        memset(&zmsg,0,sizeof(zmsg));
+        zmsg.zH.version = zblock->RO.version;
+        zmsg.zH.merkle_root = zblock->RO.merkle_root;
+        zmsg.zH.timestamp = zblock->RO.timestamp;
+        zmsg.zH.bits = zblock->RO.bits;
+        zmsg.zH.bignonce = zblock->zRO.bignonce;
+        if ( iguana_rwvarint32(1,zmsg.zH.var_numelements,&zblock->zRO.numelements) != sizeof(zmsg.zH.var_numelements) )
+            printf("unexpected varint size for zmsg.zH.numelements <- %d\n",zblock->zRO.numelements);
         for (i=0; i<ZCASH_SOLUTION_ELEMENTS; i++)
-            msg.zH.solution[i] = block->zRO[0].solution[i];
-    } else msg.H.nonce = block->RO.nonce;
-    msg.txn_count = 0;//block->RO.txn_count;
-    len = iguana_rwblock(myinfo,coin->symbol,coin->chain->zcash,coin->chain->auxpow,coin->chain->hashalgo,1,&hash2,serialized,&msg,IGUANA_MAXPACKETSIZE*2);
+            zmsg.zH.solution[i] = zblock->zRO.solution[i];
+        zmsg.txn_count = 0;//block->RO.txn_count;
+        len = iguana_rwblock(myinfo,coin->symbol,coin->chain->zcash,coin->chain->auxpow,coin->chain->hashalgo,1,&hash2,serialized,&msg,IGUANA_MAXPACKETSIZE*2);
+    }
+    else
+    {
+        memset(&msg,0,sizeof(msg));
+        msg.H.version = block->RO.version;
+        msg.H.prev_block = block->RO.prev_block;
+        msg.H.merkle_root = block->RO.merkle_root;
+        msg.H.timestamp = block->RO.timestamp;
+        msg.H.bits = block->RO.bits;
+        msg.H.nonce = block->RO.nonce;
+        msg.txn_count = 0;//block->RO.txn_count;
+        len = iguana_rwblock(myinfo,coin->symbol,coin->chain->zcash,coin->chain->auxpow,coin->chain->hashalgo,1,&hash2,serialized,&msg,IGUANA_MAXPACKETSIZE*2);
+    }
     init_hexbytes_noT(hexstr,serialized,len);
     jaddstr(json,"blockheader",hexstr);
     if ( txidsflag != 0 )
diff --git a/includes/iguana_structs.h b/includes/iguana_structs.h
index bffac7f91..486884d80 100755
--- a/includes/iguana_structs.h
+++ b/includes/iguana_structs.h
@@ -55,7 +55,7 @@ struct iguana_chain
     char use_addmultisig,do_opreturn;
     int32_t estblocktime,protover;
     bits256 genesishash2,PoWtarget,PoStargets[16]; int32_t numPoStargets,PoSheights[16];
-    uint8_t zcash,auxpow,havecltv,alertpubkey[65];
+    uint8_t zcash,auxpow,debug,havecltv,alertpubkey[65];
     uint16_t targetspacing,targettimespan; uint32_t nBits,normal_txversion,locktime_txversion;
 };
 
@@ -104,18 +104,37 @@ struct iguana_msgblockhdr
     uint32_t version;
     bits256 prev_block,merkle_root;
     uint32_t timestamp,bits,nonce;
-}PACKEDSTRUCT;
+} PACKEDSTRUCT;
 
 #define ZKSNARK_PROOF_SIZE 584
-#define ZCASH_SOLUTION_ELEMENTS 32
+#define ZCASH_SOLUTION_ELEMENTS 1344
+
+struct iguana_msgzblockhdr
+{
+    uint32_t version;
+    bits256 prev_block,merkle_root,reserved;
+    uint32_t timestamp,bits;
+    bits256 bignonce;
+    uint8_t var_numelements[3];
+    uint32_t solution[ZCASH_SOLUTION_ELEMENTS];
+} PACKEDSTRUCT;
 
-struct iguana_msgblockhdr_zcash
+/*int32_t nVersion;
+uint256 hashPrevBlock;
+uint256 hashMerkleRoot;
+uint256 hashReserved;
+uint32_t nTime;
+uint32_t nBits;
+uint256 nNonce;
+std::vector<unsigned char> nSolution;*/
+
+/*struct iguana_msgblockhdr_zcash
 {
     bits256 bignonce;
     uint8_t numelements;
     uint32_t solution[ZCASH_SOLUTION_ELEMENTS];
     //bits256 reserved; // only here if auxpow is set
-}PACKEDSTRUCT;
+}PACKEDSTRUCT;*/
 
 struct iguana_msgmerkle
 {
@@ -127,9 +146,14 @@ struct iguana_msgmerkle
 struct iguana_msgblock
 {
     struct iguana_msgblockhdr H; // double hashed for blockhash
-    struct iguana_msgblockhdr_zcash zH;
     uint32_t txn_count;
-}PACKEDSTRUCT;
+} PACKEDSTRUCT;
+
+struct iguana_msgzblock
+{
+    struct iguana_msgzblockhdr zH; // double hashed for blockhash
+    uint32_t txn_count;
+} PACKEDSTRUCT;
 
 struct iguana_msgvin { bits256 prev_hash; uint8_t *vinscript,*userdata,*spendscript,*redeemscript; uint32_t prev_vout,sequence; uint16_t scriptlen,p2shlen,userdatalen,spendlen; }PACKEDSTRUCT;
 
@@ -181,13 +205,13 @@ struct iguana_blockRO
     uint16_t txn_count,numvouts,numvins,allocsize;
 }PACKEDSTRUCT;
 
-struct iguana_zcashRO { bits256 bignonce; uint32_t solution[ZCASH_SOLUTION_ELEMENTS]; }PACKEDSTRUCT;
+struct iguana_zcashRO { bits256 bignonce; uint32_t numelements,solution[ZCASH_SOLUTION_ELEMENTS]; }PACKEDSTRUCT;
 
 struct iguana_zblockRO
 {
     struct iguana_blockRO RO;
     struct iguana_zcashRO zRO;
-}PACKEDSTRUCT;
+} PACKEDSTRUCT;
 
 #define iguana_blockfields      double PoW; \
 int32_t height,fpos; uint32_t fpipbits,issued,lag:18,sigsvalid:1,protected:1,peerid:12; \
@@ -198,14 +222,14 @@ struct iguana_blockRO RO
 struct iguana_block
 {
     iguana_blockfields;
-    struct iguana_zcashRO zRO[];
-}PACKEDSTRUCT;
+    //struct iguana_zcashRO zRO[];
+} PACKEDSTRUCT;
 
 struct iguana_zblock // mu
 {
     iguana_blockfields;
     struct iguana_zcashRO zRO;
-}PACKEDSTRUCT;
+} PACKEDSTRUCT;
 
 #define IGUANA_LHASH_BLOCKS 0
 #define IGUANA_LHASH_TXIDS 1 //