diff --git a/iguana/exchanges/LP_nativeDEX.c b/iguana/exchanges/LP_nativeDEX.c
index 884fff9d5..1a4cd79d3 100644
--- a/iguana/exchanges/LP_nativeDEX.c
+++ b/iguana/exchanges/LP_nativeDEX.c
@@ -299,6 +299,9 @@ int32_t LP_sock_check(char *typestr,void *ctx,char *myipaddr,int32_t pubsock,int
                 else printf("%s got recv.%d\n",typestr,recvlen);
 #endif
                 double millis = OS_milliseconds();
+                if ( strlen((char *)ptr)+sizeof(bits256) <= recvlen )
+                    if ( LP_magic_check(ptr,recvlen) < 0 )
+                        printf("magic check error\n");
                 if ( (retstr= LP_process_message(ctx,typestr,myipaddr,pubsock,ptr,recvlen,sock)) != 0 )
                     free(retstr);
                 if ( Broadcaststr != 0 )
diff --git a/iguana/exchanges/LP_network.c b/iguana/exchanges/LP_network.c
index 41d514078..b8d973f49 100644
--- a/iguana/exchanges/LP_network.c
+++ b/iguana/exchanges/LP_network.c
@@ -166,13 +166,29 @@ bits256 LP_calc_magic(uint8_t *msg,int32_t len)
     {
         magic = rand256(1);
         pubkey = curve25519(magic,curve25519_basepoint9());
-        shared = curve25519(magic,pubkey);
+        shared = curve25519(hash,pubkey);
         if ( shared.bytes[1] == LP_BARTERDEX_VERSION )
             break;
     }
     return(magic);
 }
 
+int32_t LP_magic_check(uint8_t *msg,int32_t recvlen)
+{
+    bits256 magic,hash,pubkey,shared;
+    recvlen -= sizeof(bits256);
+    if ( recvlen > 0 )
+    {
+        vcalc_sha256(0,hash.bytes,msg,recvlen);
+        memcpy(magic.bytes,&msg[recvlen],sizeof(magic));
+        pubkey = curve25519(magic,curve25519_basepoint9());
+        shared = curve25519(hash,pubkey);
+        printf("shared.[1] = %d\n",shared.bytes[1]);
+        return(shared.bytes[1] == LP_BARTERDEX_VERSION);
+    }
+    return(-1);
+}
+
 int32_t LP_crc32find(int32_t *duplicatep,int32_t ind,uint32_t crc32)
 {
     static uint32_t crcs[1024]; static unsigned long dup,total;