diff --git a/crypto777/iguana_utils.c b/crypto777/iguana_utils.c
index 222417d1c..b449fd66d 100755
--- a/crypto777/iguana_utils.c
+++ b/crypto777/iguana_utils.c
@@ -130,10 +130,13 @@ bits256 bits256_from_compact(uint32_t c)
 	uint32_t nbytes,nbits,i; bits256 x;
     memset(x.bytes,0,sizeof(x));
     nbytes = (c >> 24) & 0xFF;
-    nbits = (8 * (nbytes - 3));
-    x.ulongs[0] = c & 0xFFFFFF;
-    for (i=0; i<nbits; i++)
-        x = bits256_lshift(x);
+    if ( nbytes >= 3 )
+    {
+        nbits = (8 * (nbytes - 3));
+        x.ulongs[0] = c & 0xFFFFFF;
+        for (i=0; i<nbits; i++)
+            x = bits256_lshift(x);
+    }
     return(x);
 }
 
diff --git a/iguana/iguana777.h b/iguana/iguana777.h
index 95cc2c591..0ad703adb 100755
--- a/iguana/iguana777.h
+++ b/iguana/iguana777.h
@@ -350,9 +350,15 @@ struct iguana_blockRO
     uint32_t timestamp,nonce,bits,version;
     uint32_t firsttxidind,firstvin,firstvout,firstpkind,firstexternalind,recvlen:24,tbd:8;
     uint16_t txn_count,numvouts,numvins,allocsize;
-};
+} __attribute__((packed));
+
+struct iguana_zcashRO { bits256 bignonce; uint32_t solution[ZCASH_SOLUTION_ELEMENTS]; } __attribute__((packed));
 
-struct iguana_zcashRO { bits256 bignonce; uint32_t solution[ZCASH_SOLUTION_ELEMENTS]; };
+struct iguana_zblockRO
+{
+    struct iguana_blockRO RO;
+    struct iguana_zcashRO zRO;
+} __attribute__((packed));
 
 #define iguana_blockfields      double PoW; \
                                 int32_t height,fpos; uint32_t fpipbits,issued,lag:20,peerid:12; \
@@ -364,13 +370,13 @@ struct iguana_block
 {
     iguana_blockfields;
     struct iguana_zcashRO zRO[];
-};
+} __attribute__((packed));
 
 struct iguana_zblock // mu
 {
     iguana_blockfields;
     struct iguana_zcashRO zRO;
-};
+} __attribute__((packed));
 
 #define IGUANA_LHASH_BLOCKS 0
 #define IGUANA_LHASH_TXIDS 1 //
diff --git a/iguana/iguana_blocks.c b/iguana/iguana_blocks.c
index a123cd446..d747d4fa0 100755
--- a/iguana/iguana_blocks.c
+++ b/iguana/iguana_blocks.c
@@ -501,6 +501,7 @@ struct iguana_block *iguana_fastlink(struct iguana_info *coin,int32_t hwmheight)
         block->valid = block->mainchain = 1;
         block->hdrsi = hdrsi, block->bundlei = bundlei;
         block->height = height;
+        //printf("set height.%d for bundlei.%d\n",height,bundlei);
         block->PoW = PoW_from_compact(block->RO.bits,coin->chain->unitval) + prevPoW;
         block->hh.prev = prev;
         if ( prev != 0 )
@@ -592,9 +593,6 @@ struct iguana_block *_iguana_chainlink(struct iguana_info *coin,struct iguana_bl
             if ( coin->isRT != 0 || block->height == hwmchain->height )
             {
                 coin->blocks.maxblocks = (block->height + 1);
-                if ( coin->chain->zcash != 0 )
-                    coin->blocks.hwmchain = *(struct iguana_zblock *)block;
-                else *(struct iguana_block *)&coin->blocks.hwmchain = *block;
                 //printf("[%s] <- ht.%d %f\n",bits256_str(str,block->RO.hash2),coin->blocks.hwmchain.height,coin->blocks.hwmchain.PoW);
                 char str[65],str2[65]; bits256 zero;
                 memset(&zero,0,sizeof(zero));
@@ -667,6 +665,7 @@ struct iguana_block *_iguana_chainlink(struct iguana_info *coin,struct iguana_bl
                     printf(" call process_iguanablock2.%p ht.%d nbits.%08x\n",block->serdata,block->height,*(uint32_t *)&block->serdata[72]);
                     process_iguanablock(block->serdata,CHAINPARMS);
                 }*/
+                iguana_blockzcopy(coin->chain->zcash,(void *)&coin->blocks.hwmchain,block);
                 return(block);
             }
         }
@@ -674,7 +673,7 @@ struct iguana_block *_iguana_chainlink(struct iguana_info *coin,struct iguana_bl
     return(0);
 }
 
-void iguana_blocksetheights(struct iguana_info *coin,struct iguana_block *block)
+/*void iguana_blocksetheights(struct iguana_info *coin,struct iguana_block *block)
 {
     int32_t height;
     if ( (height= block->height) < 0 )
@@ -685,7 +684,7 @@ void iguana_blocksetheights(struct iguana_info *coin,struct iguana_block *block)
         iguana_bundlehash2add(coin,0,coin->bundles[height/coin->chain->bundlesize],height % coin->chain->bundlesize,block->RO.hash2);
         block = block->hh.next, height++;
     }
-}
+}*/
 
 int32_t iguana_chainextend(struct iguana_info *coin,struct iguana_block *newblock)
 {
diff --git a/iguana/iguana_init.c b/iguana/iguana_init.c
index 41fbbf508..6b6881dbf 100755
--- a/iguana/iguana_init.c
+++ b/iguana/iguana_init.c
@@ -129,8 +129,7 @@ bits256 iguana_genesis(struct iguana_info *coin,struct iguana_chain *chain)
             iguana_blockzcopy(coin->chain->zcash,block,ptr);
             printf("size.%d genesis block PoW %f ptr %f\n",block->RO.allocsize,block->PoW,ptr->PoW);
             coin->blocks.recvblocks = coin->blocks.issuedblocks = 1;
-        }
-        else printf("genesis block doesnt validate for %s ht.%d\n",coin->symbol,height);
+        } else printf("genesis block doesnt validate for %s ht.%d\n",coin->symbol,height);
     } else printf("couldnt hashset genesis\n");
     return(hash2);
 }
diff --git a/iguana/iguana_ramchain.c b/iguana/iguana_ramchain.c
index 8d4d4622b..10afcec34 100755
--- a/iguana/iguana_ramchain.c
+++ b/iguana/iguana_ramchain.c
@@ -1368,7 +1368,7 @@ int32_t iguana_Xspendmap(struct iguana_info *coin,struct iguana_ramchain *ramcha
 
 struct iguana_ramchain *_iguana_ramchain_map(struct iguana_info *coin,char *fname,struct iguana_bundle *bp,int32_t numblocks,struct iguana_ramchain *ramchain,struct OS_memspace *hashmem,uint32_t ipbits,bits256 hash2,bits256 prevhash2,int32_t bundlei,long fpos,int32_t allocextras,int32_t expanded,uint8_t zcash)
 {
-    RAMCHAIN_DECLARE; int32_t valid,iter,i,checki,hdrsi; long filesize; void *ptr; char str[65],str2[65],dirstr[64]; struct iguana_block *block; struct iguana_blockRO *bRO; struct iguana_ramchaindata *rdata;
+    RAMCHAIN_DECLARE; int32_t valid,iter,i,checki,hdrsi; long filesize; void *ptr; char str[65],str2[65],dirstr[64]; struct iguana_block *block; struct iguana_zblockRO zRO; struct iguana_ramchaindata *rdata;
     /*if ( ramchain->expanded != 0 && (ramchain->sigsfileptr == 0 || ramchain->sigsfilesize == 0) )
     {
         sprintf(sigsfname,"sigs/%s/%s",coin->symbol,bits256_str(str,hash2));
@@ -1474,17 +1474,24 @@ struct iguana_ramchain *_iguana_ramchain_map(struct iguana_info *coin,char *fnam
         {
             for (i=0; i<bp->n; i++)
             {
-                if ( bp->blocks[i] == 0 &&  (bp->blocks[i]= iguana_blockhashset("mapchain",coin,-1,bRO->hash2,1)) == 0 )
+                iguana_blockzcopyRO(zcash,(void *)&zRO,0,B,i);
+                if ( bp->blocks[i] == 0 &&  (bp->blocks[i]= iguana_blockhashset("mapchain",coin,-1,zRO.RO.hash2,1)) == 0 )
                 {
                     printf("Error getting blockptr\n");
                     return(0);
                 }
-                if ( (bRO= iguana_blockzcopyRO(zcash,&bp->blocks[i]->RO,0,B,i)) != 0 )
+                else
+                {
+                    bp->hashes[i] = zRO.RO.hash2;
+                    //bp->blocks[i]->RO = zRO.RO;
+                    iguana_blockzcopyRO(zcash,&bp->blocks[i]->RO,0,(void *)&zRO,0);
+                }
+               /* if ( (bRO= iguana_blockzcopyRO(zcash,&bp->blocks[i]->RO,0,B,i)) != 0 )
                 {
                     //memcpy(&bp->blocks[i]->RO,bRO,bROsize);//coin->blocks.RO[bp->bundleheight + i];
                     //coin->blocks.RO[bp->bundleheight+i] = B[i];
                     bp->hashes[i] = bRO->hash2;
-                }
+                }*/
             }
         }
         //printf("iguana_ramchain_map.(%s) size %ld vs %ld vs filesize.%ld numblocks.%d expanded.%d fpos.%d sum %ld\n",fname,(long)iguana_ramchain_size(RAMCHAIN_ARG,ramchain->numblocks,rdata->scriptspace),(long)rdata->allocsize,(long)filesize,ramchain->numblocks,expanded,(int32_t)fpos,(long)(fpos+rdata->allocsize));
@@ -2284,6 +2291,7 @@ struct iguana_ramchain *iguana_bundleload(struct iguana_info *coin,struct iguana
                     block->queued = 1;
                     block->txvalid = 1;
                     block->height = bp->bundleheight + i;
+                    //printf("bundleload bundlei.%d < height %d %d\n",i,block->height,i);
                     block->hdrsi = bp->hdrsi;
                     block->bundlei = i;
                     block->fpipbits = (uint32_t)calc_ipbits("127.0.0.1");
@@ -2292,7 +2300,10 @@ struct iguana_ramchain *iguana_bundleload(struct iguana_info *coin,struct iguana
                     iguana_hash2set(coin,"bundleload",bp,i,block->RO.hash2);
                     bp->blocks[i] = block;
                     if ( (prev= block->hh.prev) != 0 )
+                    {
                         prev2 = prev->hh.prev;
+                        prev->hh.next = block;
+                    }
                     if ( prev2 != 0 && prev != 0 && strcmp(coin->symbol,"BTCD") == 0 && bp->bundleheight > 20000 && prev != 0 && iguana_targetbits(coin,block,prev,prev2,1,coin->chain->targetspacing,coin->chain->targettimespan) != block->RO.bits )
                     {
                         printf("nbits target error %x != %x ht.%d\n",iguana_targetbits(coin,block,prev,prev2,1,coin->chain->targetspacing,coin->chain->targettimespan),block->RO.bits,block->height);
@@ -2300,7 +2311,7 @@ struct iguana_ramchain *iguana_bundleload(struct iguana_info *coin,struct iguana
                     if ( bp->bundleheight+i == coin->blocks.hwmchain.height+1 )
                     {
                         //printf("try extend.%d\n",bp->bundleheight+i);
-                        //_iguana_chainlink(coin,block); wrong context
+                        //_iguana_chainlink(coin,block); //wrong context
                     }
                     prev2 = prev, prev = block;
                 }
diff --git a/iguana/iguana_recv.c b/iguana/iguana_recv.c
index ad1569144..545b434a4 100755
--- a/iguana/iguana_recv.c
+++ b/iguana/iguana_recv.c
@@ -214,7 +214,7 @@ struct iguana_txblock *iguana_peertxdata(struct iguana_info *coin,int32_t *bundl
 int32_t iguana_speculativefind(struct iguana_info *coin,struct iguana_bundle *bp,struct iguana_block *block,uint8_t *data,int32_t recvlen)
 {
     int32_t i,j,numcached,cachelen=0; uint8_t *tmp; char str[65];
-    if ( coin->enableCACHE == 0 )
+    if ( coin->enableCACHE == 0 || recvlen < 0 )
         return(-1);
     if ( recvlen < 0 || recvlen > IGUANA_MAXPACKETSIZE )
     {
@@ -585,6 +585,7 @@ uint32_t iguana_allhashcmp(struct iguana_info *coin,struct iguana_bundle *bp,bit
                     if ( i > 0 )
                         block->RO.prev_block = blockhashes[i-1];
                     block->height = bp->bundleheight + i;
+                    //printf("allhashcmp ht.%d for %d\n",block->height,i);
                     block->mainchain = 1;
                     if ( prev != 0 )
                     {
@@ -1151,7 +1152,7 @@ int32_t iguana_blockreq(struct iguana_info *coin,int32_t height,int32_t priority
 
 int32_t iguana_reqblocks(struct iguana_info *coin)
 {
-    int32_t hdrsi,hdrsi0,bundlei0,lflag,bundlei,iters=0,flag = 0; bits256 hash2; struct iguana_block *next,*block; struct iguana_bundle *bp;
+    int32_t hdrsi,lflag,bundlei,iters=0,flag = 0; bits256 hash2; struct iguana_block *next,*block; struct iguana_bundle *bp;
     if ( time(NULL) < coin->lastreqtime+2 )
         return(0);
     coin->lastreqtime = (uint32_t)time(NULL);
@@ -1159,6 +1160,12 @@ int32_t iguana_reqblocks(struct iguana_info *coin)
     hdrsi = (coin->blocks.hwmchain.height+1) / coin->chain->bundlesize;
     if ( (bp= coin->bundles[hdrsi]) != 0 )
     {
+        for (bundlei=0; bundlei<coin->chain->bundlesize; bundlei++)
+            if ( (block= bp->blocks[bundlei]) != 0 && bits256_cmp(block->RO.hash2,bp->hashes[bundlei]) != 0 && bits256_nonz(bp->hashes[bundlei]) != 0 )
+            {
+                char str[65]; printf("%s [%d] bundlei.%d ht.%d vs expected %d\n",bits256_str(str,bp->hashes[bundlei]),hdrsi,bundlei,block->height,bp->bundleheight+bundlei);
+                bp->blocks[bundlei] = iguana_blockfind("fixit",coin,bp->hashes[bundlei]);
+            }
         bundlei = (coin->blocks.hwmchain.height+1) % coin->chain->bundlesize;
         if ( (next= bp->blocks[bundlei]) != 0 || (next= iguana_blockfind("reqblocks",coin,bp->hashes[bundlei])) != 0 )
         {
@@ -1180,6 +1187,7 @@ int32_t iguana_reqblocks(struct iguana_info *coin)
         bundlei = (coin->blocks.hwmchain.height+1) % coin->chain->bundlesize;
         if ( 1 )
         {
+            int32_t hdrsi0,bundlei0;
             if ( (next= iguana_bundleblock(coin,&hash2,coin->bundles[hdrsi],bundlei)) == 0 )
             {
                 hdrsi0 = (coin->blocks.hwmchain.height) / coin->chain->bundlesize;