From 9780ef5997b3294723ef31fc8b456adf81147da8 Mon Sep 17 00:00:00 2001
From: Alex <alex@akselrod.org>
Date: Thu, 2 Feb 2017 10:44:22 -0700
Subject: [PATCH] Skip TxIn on coinbase transaction when indexing

---
 blockchain/indexers/cfindex.go | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/blockchain/indexers/cfindex.go b/blockchain/indexers/cfindex.go
index 104aaec3..d9beb637 100644
--- a/blockchain/indexers/cfindex.go
+++ b/blockchain/indexers/cfindex.go
@@ -160,9 +160,12 @@ func makeBasicFilterForBlock(block *btcutil.Block) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	for _, tx := range block.Transactions() {
-		for _, txIn := range tx.MsgTx().TxIn {
-			b.AddOutPoint(txIn.PreviousOutPoint)
+	for i, tx := range block.Transactions() {
+		// Skip the inputs for the coinbase transaction
+		if i != 0 {
+			for _, txIn := range tx.MsgTx().TxIn {
+				b.AddOutPoint(txIn.PreviousOutPoint)
+			}
 		}
 		for _, txOut := range tx.MsgTx().TxOut {
 			b.AddScript(txOut.PkScript)
@@ -183,10 +186,13 @@ func makeExtendedFilterForBlock(block *btcutil.Block) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	for _, tx := range block.Transactions() {
+	for i, tx := range block.Transactions() {
 		b.AddHash(tx.Hash())
-		for _, txIn := range tx.MsgTx().TxIn {
-			b.AddScript(txIn.SignatureScript)
+		// Skip the inputs for the coinbase transaction
+		if i != 0 {
+			for _, txIn := range tx.MsgTx().TxIn {
+				b.AddScript(txIn.SignatureScript)
+			}
 		}
 	}
 	f, err := b.Build()