diff --git a/src/list/Node.js b/src/list/Node.js
index 310e774..c49592c 100644
--- a/src/list/Node.js
+++ b/src/list/Node.js
@@ -13,6 +13,10 @@ class Node {
     return "" + this.id + "." + this.seq + "." + this.ver;
   }
 
+  get heads() {
+    return Object.keys(this.next).map((e) => this.next[e]);
+  }
+
   toJson() {
     return { id: this.id, seq: this.seq, ver: this.ver, data: this.data, next: this.next }
   }
diff --git a/src/list/OrbitNode.js b/src/list/OrbitNode.js
index c5a848b..d70b04b 100644
--- a/src/list/OrbitNode.js
+++ b/src/list/OrbitNode.js
@@ -19,10 +19,6 @@ class OrbitNode extends Node {
     return this.hash;
   }
 
-  get heads() {
-    return Object.keys(this.next).map((e) => this.next[e]);
-  }
-
   compact() {
     let res = { id: this.id, seq: this.seq, ver: this.ver, data: this.data }
     let items = {};