diff --git a/src/conduit/ConduitClient.php b/src/conduit/ConduitClient.php
--- a/src/conduit/ConduitClient.php
+++ b/src/conduit/ConduitClient.php
@@ -8,6 +8,8 @@
   private $timeout = 300.0;
   private $username;
   private $password;
+  private $hostID;
+  private $signature;
 
   public function getConnectionID() {
     return $this->connectionID;
@@ -37,6 +39,12 @@
     return $this;
   }
 
+  public function setServerSignature($host_id, $signature) {
+    $this->hostID = $host_id;
+    $this->signature = $signature;
+    return $this;
+  }
+
   public function callMethod($method, array $params) {
 
     $meta = array();
@@ -49,6 +57,14 @@
       $meta['connectionID'] = $this->connectionID;
     }
 
+    if ($this->hostID) {
+      $meta['hostID'] = $this->hostID;
+    }
+
+    if ($this->signature) {
+      $meta['signature'] = $this->signature;
+    }
+
     if ($method == 'conduit.connect') {
       $certificate = idx($params, 'certificate');
       if ($certificate) {