diff --git a/blkmaker_jansson.c b/blkmaker_jansson.c
index 157f061..3763c75 100644
--- a/blkmaker_jansson.c
+++ b/blkmaker_jansson.c
@@ -130,6 +130,8 @@ err:
 		tmpl->skey = true;  \
 } while(0)
 
+static void my_flip(void *, size_t);
+
 static
 const char *parse_txn(struct blktxn_t *txn, json_t *txnj) {
 	json_t *vv;
@@ -146,12 +148,14 @@ const char *parse_txn(struct blktxn_t *txn, json_t *txnj) {
 	if ((vv = json_object_get(txnj, "hash")) && json_is_string(vv))
 	{
 		hexdata = json_string_value(vv);
-		txn->hash = malloc(sizeof(*txn->hash));
-		if (!my_hex2bin(*txn->hash, hexdata, sizeof(*txn->hash)))
+		txn->hash_ = malloc(sizeof(*txn->hash_));
+		if (!my_hex2bin(*txn->hash_, hexdata, sizeof(*txn->hash_)))
 		{
-			free(txn->hash);
-			txn->hash = NULL;
+			free(txn->hash_);
+			txn->hash_ = NULL;
 		}
+		else
+			my_flip(*txn->hash_, sizeof(*txn->hash_));
 	}
 	
 	// TODO: dependcount/depends, fee, required, sigops
diff --git a/blktemplate.c b/blktemplate.c
index 93ffc20..07d00a8 100644
--- a/blktemplate.c
+++ b/blktemplate.c
@@ -97,6 +97,7 @@ static
 void blktxn_free(struct blktxn_t *bt) {
 	free(bt->data);
 	free(bt->hash);
+	free(bt->hash_);
 	free(bt->depends);
 }
 
diff --git a/blktemplate.h b/blktemplate.h
index e9747b7..9239778 100644
--- a/blktemplate.h
+++ b/blktemplate.h
@@ -23,6 +23,7 @@ typedef uint32_t blknonce_t;
 struct blktxn_t {
 	unsigned char *data;
 	size_t datasz;
+	// NOTE: The byte order of hash is backward; use hash_ instead
 	txnhash_t *hash;
 	
 	signed long dependcount;
@@ -31,6 +32,8 @@ struct blktxn_t {
 	uint64_t fee;
 	bool required;
 	int16_t sigops;
+	
+	txnhash_t *hash_;
 };
 
 // BIP 23: Long Polling