diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4f6e82e94..db876e5ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Current Master
 
+- Add a check for improper Transaction data.
 - Increase default max gas to `100000` over the RPC's `estimateGas` response.
 
 ## 2.13.4 2016-10-17
diff --git a/test/unit/util_test.js b/test/unit/util_test.js
index 45e545e8e..b7d8ba528 100644
--- a/test/unit/util_test.js
+++ b/test/unit/util_test.js
@@ -227,5 +227,22 @@ describe('util', function() {
         assert.equal(result.toString(10), '1111000000000000000', 'accepts decimals')
       })
     })
+    describe('#isHex', function(){
+      it('should return true when given a hex string', function() {
+        var result = util.isHex('c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f2')
+        assert.equal(result, true)
+      })
+
+      it('should return false when given a non-hex string', function() {
+        var result = util.isHex('c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714imnotreal')
+        assert.equal(result, false)
+      })
+
+      it('should return false when given a string containing a non letter/number character', function() {
+        var result = util.isHex('c3ab8ff13720!8ad9047dd39466b3c%8974e592c2fa383d4a396071imnotreal')
+        assert.equal(result, false)
+      })
+
+    })
   })
 })