diff --git a/src/main/java/jota/utils/Curl.java b/src/main/java/jota/pow/Curl.java
similarity index 98%
rename from src/main/java/jota/utils/Curl.java
rename to src/main/java/jota/pow/Curl.java
index 2c296e8..d72ed45 100644
--- a/src/main/java/jota/utils/Curl.java
+++ b/src/main/java/jota/pow/Curl.java
@@ -1,4 +1,4 @@
-package jota.utils;
+package jota.pow;
 
 /**
  * (c) 2016 Come-from-Beyond
diff --git a/src/main/java/jota/utils/Checksum.java b/src/main/java/jota/utils/Checksum.java
index 10a49de..fe22f5a 100644
--- a/src/main/java/jota/utils/Checksum.java
+++ b/src/main/java/jota/utils/Checksum.java
@@ -2,6 +2,8 @@ package jota.utils;
 
 import org.apache.commons.lang3.StringUtils;
 
+import jota.pow.Curl;
+
 /**
  * Created by pinpong on 02.12.16.
  */
diff --git a/src/main/java/jota/utils/InputValidator.java b/src/main/java/jota/utils/InputValidator.java
index ed5f2ef..c1ddd2a 100644
--- a/src/main/java/jota/utils/InputValidator.java
+++ b/src/main/java/jota/utils/InputValidator.java
@@ -17,7 +17,7 @@ public class InputValidator {
         return true;
     }
 
-    public static boolean isTrytes(String trytes, int length) {
+    public static boolean isTrytes(final String trytes, final int length) {
         return trytes.matches("^[A-Z9]{" + (length == 0 ? "0," : length) + "}$");
     }
 }
diff --git a/src/main/java/jota/utils/Signing.java b/src/main/java/jota/utils/Signing.java
index 025529e..a5e2553 100644
--- a/src/main/java/jota/utils/Signing.java
+++ b/src/main/java/jota/utils/Signing.java
@@ -4,6 +4,8 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import jota.pow.Curl;
+
 public class Signing {
 
     static int[] key(int[] seed, int index, int length) {