utils: bip69 output sorting

Author: hieblmi

utils/tx_sort.go

@@ -0,0 +1,15 @@
+package utils
+
+import (
+	"bytes"
+
+	"github.com/btcsuite/btcd/wire"
+)
+
+// Bip69Less is taken from btcd in btcutil/txsort/txsort.go.
+func Bip69Less(output1, output2 *wire.TxOut) bool {
+	if output1.Value == output2.Value {
+		return bytes.Compare(output1.PkScript, output2.PkScript) < 0
+	}
+	return output1.Value < output2.Value
+}