diff --git a/src/main/base/org/bdware/sc/conn/ByteUtil.java b/src/main/base/org/bdware/sc/conn/ByteUtil.java
index 2ba3d55..a0625ec 100644
--- a/src/main/base/org/bdware/sc/conn/ByteUtil.java
+++ b/src/main/base/org/bdware/sc/conn/ByteUtil.java
@@ -65,12 +65,6 @@ public class ByteUtil {
         bo.write(i & 0xff);
     }
 
-    public static void writeLong(ByteArrayOutputStream bo, long l) {
-        for (int i = 56; i >= 0; i -= 8) {
-            bo.write(((int) (l >> i)) & 0xff);
-        }
-    }
-
     public static long readLong(ByteArrayInputStream bi) {
         long ret = 0L;
         for (int i = 0; i < 8; i++) {
@@ -80,11 +74,15 @@ public class ByteUtil {
         return ret;
     }
 
+    public static void writeLong(ByteArrayOutputStream bo, long l) {
+        for (int i = 56; i >= 0; i -= 8) {
+            bo.write(((int) (l >> i)) & 0xff);
+        }
+    }
+
     public static byte[] readBytes(ByteArrayInputStream bi, int len) {
         byte[] ret = new byte[len];
         bi.read(ret, 0, len);
         return ret;
     }
-
-
 }
diff --git a/src/main/entry/org/bdware/sc/NodeCenterConn.java b/src/main/entry/org/bdware/sc/NodeCenterConn.java
index a8acfdf..f5766b5 100644
--- a/src/main/entry/org/bdware/sc/NodeCenterConn.java
+++ b/src/main/entry/org/bdware/sc/NodeCenterConn.java
@@ -3,14 +3,10 @@ package org.bdware.sc;
 import com.google.gson.JsonObject;
 import org.zz.gmhelper.SM2KeyPair;
 
-import java.math.BigInteger;
-
 public interface NodeCenterConn {
-    boolean deliverEvent(String event, String target);
+    String[] listNodes();
 
-    NodeKey[] listNodes();
-
-    String getNodeId(String str);
+    String getNodeId();
 
     String routeContract(String contractID);
 
@@ -22,25 +18,6 @@ public interface NodeCenterConn {
 
     JsonObject checkIsContract(String requestID, String json);
 
-    /**
-     * get k nearest nodes to the key in the hash function range
-     *
-     * @param key the key
-     * @param k   the number of required node ids
-     * @return ids of k nearest nodes
-     */
-    String[] getClusterByKey(String key, int k);
-
-    class NodeKey {
-        public String id;
-        public BigInteger biId;
-
-        public NodeKey(String id) {
-            this.id = id;
-            this.biId = new BigInteger(id, 16);
-        }
-    }
-
     class Response {
         String responseID;
         String action;