diff --git a/transaction_input.go b/transaction_input.go
index 1c57c2b..e64e9e6 100644
--- a/transaction_input.go
+++ b/transaction_input.go
@@ -11,7 +11,9 @@ type TXInput struct {
 
 // UnlocksOutputWith checks whether the address initiated the transaction
 func (in *TXInput) UnlocksOutputWith(pubKeyHash []byte) bool {
-	lockingHash := HashPubKey(in.ScriptSig)
+	sigLen := 64
+	pubKey := in.ScriptSig[sigLen:]
+	lockingHash := HashPubKey(pubKey)
 
 	return bytes.Compare(lockingHash, pubKeyHash) == 0
 }