diff --git a/src/bitcoind.cpp b/src/bitcoind.cpp
index 68e0da8b3..ff329a0d6 100644
--- a/src/bitcoind.cpp
+++ b/src/bitcoind.cpp
@@ -77,7 +77,8 @@ void WaitForShutdown(boost::thread_group* threadGroup)
         //fprintf(stderr,"call passport iteration\n");
         if ( ASSETCHAINS_SYMBOL[0] == 0 )
         {
-            komodo_passport_iteration();
+            if ( KOMODO_NSPV == 0 )
+                komodo_passport_iteration();
             for (i=0; i<10; i++)
             {
                 fShutdown = ShutdownRequested();
diff --git a/src/komodo_nSPV.h b/src/komodo_nSPV.h
index fd90df5f4..56ec85488 100644
--- a/src/komodo_nSPV.h
+++ b/src/komodo_nSPV.h
@@ -256,26 +256,6 @@ void NSPV_txproof_purge(struct NSPV_txproof *ptr)
     }
 }
 
-/*struct NSPV_utxo
-{
-    struct NSPV_txproof T;
-    int64_t satoshis,extradata;
-    int32_t vout,prevht,nextht,pad32;
-};
-
-int32_t NSPV_rwutxo(int32_t rwflag,uint8_t *serialized,struct NSPV_utxo *ptr)
-{
-    int32_t len = 0;
-    len += NSPV_rwtxproof(rwflag,&serialized[len],&ptr->T);
-    len += iguana_rwnum(rwflag,&serialized[len],sizeof(ptr->satoshis),&ptr->satoshis);
-    len += iguana_rwnum(rwflag,&serialized[len],sizeof(ptr->extradata),&ptr->extradata);
-    len += iguana_rwnum(rwflag,&serialized[len],sizeof(ptr->vout),&ptr->vout);
-    len += iguana_rwnum(rwflag,&serialized[len],sizeof(ptr->prevht),&ptr->prevht);
-    len += iguana_rwnum(rwflag,&serialized[len],sizeof(ptr->nextht),&ptr->nextht);
-    len += iguana_rwnum(rwflag,&serialized[len],sizeof(ptr->pad32),&ptr->pad32);
-    return(len);
-}*/
-
 struct NSPV_ntzproofshared
 {
     struct NSPV_equihdr *hdrs;
@@ -383,4 +363,13 @@ void NSPV_broadcast_purge(struct NSPV_broadcastresp *ptr)
         memset(ptr,0,sizeof(*ptr));
 }
 
+uint256 NSPV_doublesha256(uint8_t *data,int32_t datalen)
+{
+    bits256 _hash; uint256 hash;
+    _hash = bits256_doublesha256(0,data,datalen);
+    for (i=0; i<32; i++)
+        ((uint8_t *)&hash)[i] = _hash.bytes[31 - i];
+    return(hash);
+}
+
 #endif // KOMODO_NSPV_H
diff --git a/src/komodo_nSPV_superlite.h b/src/komodo_nSPV_superlite.h
index a2f80b79e..ade2c8115 100644
--- a/src/komodo_nSPV_superlite.h
+++ b/src/komodo_nSPV_superlite.h
@@ -384,13 +384,11 @@ UniValue NSPV_spentinfo(uint256 txid,int32_t vout)
 
 UniValue NSPV_broadcast(char *hex)
 {
-    uint8_t *msg,*data; bits256 _txid; uint256 txid; uint16_t n; int32_t i,len = 0; struct NSPV_broadcastresp B;
+    uint8_t *msg,*data; uint256 txid; uint16_t n; int32_t i,len = 0; struct NSPV_broadcastresp B;
     n = (int32_t)strlen(hex) >> 1;
     data = (uint8_t *)malloc(n);
     decode_hex(data,n,hex);
-    _txid = bits256_doublesha256(0,data,n);
-    for (i=0; i<32; i++)
-        ((uint8_t *)&txid)[i] = _txid.bytes[31 - i];
+    txid = NSPV_doublesha256(data,n);
     msg = (uint8_t *)malloc(1 + sizeof(txid) + sizeof(n) + n);
     msg[len++] = NSPV_BROADCAST;
     len += iguana_rwbignum(1,&msg[len],sizeof(txid),(uint8_t *)&txid);
diff --git a/src/komodo_nSPV_wallet.h b/src/komodo_nSPV_wallet.h
index c96aa99db..d53d0c8a1 100644
--- a/src/komodo_nSPV_wallet.h
+++ b/src/komodo_nSPV_wallet.h
@@ -23,6 +23,37 @@ extern void TxToJSON(const CTransaction& tx, const uint256 hashBlock, UniValue&
 #define NSPV_AUTOLOGOUT 60
 #define NSPV_BRANCHID 0x76b809bb
 
+
+/*struct NSPV_ntzproofshared
+{
+    struct NSPV_equihdr *hdrs;
+    int32_t prevht,nextht,pad32;
+    uint16_t numhdrs,pad16;
+};
+
+struct NSPV_ntzsproofresp
+{
+    struct NSPV_ntzproofshared common;
+    uint256 prevtxid,nexttxid;
+    int32_t pad32,prevtxidht,nexttxidht;
+    uint16_t prevtxlen,nexttxlen;
+    uint8_t *prevntz,*nextntz;
+};*/
+
+int32_t NSPV_validatehdrs(struct NSPV_ntzsproofresult *ptr)
+{
+    int32_t i;
+    // verify nextntz is valid notarization
+    // validate blockhash of lasthdr with nextntz value, and height
+    for (i=numhdrs-1; i>0; i--)
+    {
+        // make sure the hash of i-1 matches the prevBlockhash of i
+    }
+    // verify prevntz is valid notarization
+    // verify blockhash of first hdr with prevntz value and height
+    return(0);
+}
+
 int32_t NSPV_gettransaction(uint256 txid,int32_t height,CTransaction &tx)
 {
     char *txstr; int32_t retval = 0;
@@ -35,11 +66,15 @@ int32_t NSPV_gettransaction(uint256 txid,int32_t height,CTransaction &tx)
         retval = -1;
     else
     {
-        //printf("got tx.(%s)\n",txstr);
-        // need to validate txproof
         NSPV_notarizations(height); // gets the prev and next notarizations
-        NSPV_hdrsproof(NSPV_ntzsresult.prevntz.height,NSPV_ntzsresult.nextntz.height); // validate the segment
-        // merkle prove txproof to the merkleroot in the corresponding hdr
+        if ( NSPV_ntzsresult.prevntz.height != 0 && NSPV_ntzsresult.prevntz.height <= NSPV_ntzsresult.nextntz.height )
+        {
+            NSPV_hdrsproof(NSPV_ntzsresult.prevntz.height,NSPV_ntzsresult.nextntz.height); // validate the segment
+            if ( NSPV_validatehdrs(&NSPV_ntzsproofresult) == 0 )
+            {
+                // merkle prove txproof to the merkleroot in the corresponding hdr
+            }
+        } else retval = -1;
     }
     free(txstr);
     return(retval);