diff --git a/src/main/scala/org/scalacoin/crypto/TransactionSignatureChecker.scala b/src/main/scala/org/scalacoin/crypto/TransactionSignatureChecker.scala
index eedcdd1df9..46373cee51 100644
--- a/src/main/scala/org/scalacoin/crypto/TransactionSignatureChecker.scala
+++ b/src/main/scala/org/scalacoin/crypto/TransactionSignatureChecker.scala
@@ -3,6 +3,8 @@ package org.scalacoin.crypto
 import org.scalacoin.protocol.script.ScriptPubKey
 import org.scalacoin.protocol.transaction.{Transaction, TransactionInput}
 import org.scalacoin.script.crypto.HashType
+import org.scalacoin.util.BitcoinSUtil
+import org.slf4j.LoggerFactory
 
 /**
  * Created by chris on 2/16/16.
@@ -10,6 +12,7 @@ import org.scalacoin.script.crypto.HashType
 trait TransactionSignatureChecker {
 
 
+  private def logger = LoggerFactory.getLogger(this.getClass())
   /**
    * Checks the signature of a scriptSig in the spending transaction against the
    * given scriptPubKey
@@ -24,6 +27,8 @@ trait TransactionSignatureChecker {
   def checkSignature(spendingTransaction : Transaction, inputIndex : Int, scriptPubKey : ScriptPubKey,
                       signature : ECDigitalSignature, pubKey: ECPublicKey, hashType : HashType) : Boolean = {
     val hashForSignature = TransactionSignatureSerializer.hashForSignature(spendingTransaction,inputIndex,scriptPubKey,hashType)
+    logger.info("Hash for signature: " + BitcoinSUtil.encodeHex(hashForSignature))
+
     val isValid = pubKey.verify(hashForSignature,signature)
     isValid
   }
diff --git a/src/test/scala/org/scalacoin/crypto/TransactionSignatureCheckerTest.scala b/src/test/scala/org/scalacoin/crypto/TransactionSignatureCheckerTest.scala
index 82eb3a5356..281e60365f 100644
--- a/src/test/scala/org/scalacoin/crypto/TransactionSignatureCheckerTest.scala
+++ b/src/test/scala/org/scalacoin/crypto/TransactionSignatureCheckerTest.scala
@@ -16,9 +16,10 @@ class TransactionSignatureCheckerTest extends FlatSpec with MustMatchers {
       TransactionTestUtil.transactionWithSpendingInputAndCreditingOutput
     val scriptSig : ScriptSignature = spendingInput.scriptSignature
     val pubKey : ECPublicKey = ECFactory.publicKey(scriptSig.asm.last.bytes)
-    require("30450221008337ce3ce0c6ac0ab72509f889c1d52701817a2362d6357457b63e3bdedc0c0602202908963b9cf1a095ab3b34b95ce2bc0d67fb0f19be1cc5f7b3de0b3a325629bf01" == scriptSig.signatures.head.hex)
-    require("0241d746ca08da0a668735c3e01c1fa02045f2f399c5937079b6434b5a31dfe353" == pubKey.hex)
+
     val hashType = scriptSig.hashType(scriptSig.signatures.head)
+    require(scriptSig.signatures.head.hex == "30450221008337ce3ce0c6ac0ab72509f889c1d52701817a2362d6357457b63e3bdedc0c0602202908963b9cf1a095ab3b34b95ce2bc0d67fb0f19be1cc5f7b3de0b3a325629bf01")
+    require(pubKey.hex == "0241d746ca08da0a668735c3e01c1fa02045f2f399c5937079b6434b5a31dfe353" )
     require(hashType == SIGHASH_ALL)
     TransactionSignatureChecker.checkSignature(spendingTx,0,creditingOutput.scriptPubKey,
       scriptSig.signatures.head,pubKey,hashType) must be (true)
diff --git a/src/test/scala/org/scalacoin/util/TransactionTestUtil.scala b/src/test/scala/org/scalacoin/util/TransactionTestUtil.scala
index d26e8a747f..a73bf06953 100644
--- a/src/test/scala/org/scalacoin/util/TransactionTestUtil.scala
+++ b/src/test/scala/org/scalacoin/util/TransactionTestUtil.scala
@@ -55,6 +55,7 @@ trait TransactionTestUtil {
     val creditingOutput = TestUtil.parentSimpleTransaction.outputs(creditingTx.inputs.head.previousOutput.vout)
     //make sure the outpoint index and the outpoint txid are correct
     require(spendingTx.inputs.head.previousOutput.txId == creditingTx.txId)
+    require(spendingTx.inputs.head.previousOutput.vout == 0)
     (spendingTx,spendingTx.inputs.head, creditingOutput)
   }
 }