diff --git a/hubzilla/addon/vs01/vs01_spool.php b/hubzilla/addon/vs01/vs01_spool.php
index 877eb9d..5a50b2a 100644
--- a/hubzilla/addon/vs01/vs01_spool.php
+++ b/hubzilla/addon/vs01/vs01_spool.php
@@ -7,9 +7,9 @@
  * See VS-RENDERER-SPEC.md — Spool POST Handler section.
  */
 
-// ----------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
 // POST HANDLER
-// ----------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
 
 function vs01_handle_post($association_slug, $vs_code, $access) {
     $schemas = vs01_load_schemas();
@@ -62,30 +62,29 @@ function vs01_handle_post($association_slug, $vs_code, $access) {
             $out .= '<li>' . vs01_h($e) . '</li>';
         }
         $out .= '</ul></div>';
-        // Re-render form with submitted values and errors
         $out .= vs01_render_vs_form_with_values($association_slug, $vs_code, $access, $fields);
         return $out;
     }
 
-    // Build spool envelope
-    $config    = vs01_load_config();
-    $assoc     = $config['associations'][$association_slug] ?? [];
-    $envelope  = vs01_build_spool_envelope(
+    // Build and POST spool envelope
+    $config  = vs01_load_config();
+    $assoc   = $config['associations'][$association_slug] ?? [];
+    $envelope = vs01_build_spool_envelope(
         $vs_code,
         $perspective_key,
         $fields,
         $association_slug,
-        $assoc['channel_id'] ?? ''
+        $assoc['channel_id'] ?? '',
+        $access,
+        $config['node_token'] ?? ''
     );
 
-    // POST to orchestrator
-    $result = vs01_post_to_orchestrator($envelope);
+    $result = vs01_post_to_orchestrator($envelope, $config);
 
     if ($result === true) {
-        // THROWAWAY — replace with TMP review redirect or confirmation page
         return '<div class="vs01-content">
                     <div class="alert alert-success">
-                        Your record for ' . vs01_h($vs_code) . ' has been submitted.
+                        Your record for ' . vs01_h($vs_code) . ' has been saved.
                         <a href="' . z_root() . '/vs01/' . vs01_h($association_slug) . '">
                             Return to ' . vs01_h($assoc['name'] ?? $association_slug) . '
                         </a>
@@ -99,9 +98,9 @@ function vs01_handle_post($association_slug, $vs_code, $access) {
             </div>';
 }
 
-// ----------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
 // VALIDATION
-// ----------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
 
 function vs01_validate_required($perspective, $fields) {
     $errors = [];
@@ -116,32 +115,65 @@ function vs01_validate_required($perspective, $fields) {
     return $errors;
 }
 
-// ----------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
 // SPOOL ENVELOPE
-// ----------------------------------------------------------------------------
+// Matches contracts/vs01/record-v1.json — _header / _payload shape.
+// ---------------------------------------------------------------------------
 
-function vs01_build_spool_envelope($vs_code, $perspective, $fields, $association_slug, $channel_id) {
+function vs01_build_spool_envelope($vs_code, $perspective, $fields, $association_slug, $channel_id, $standing, $node_token) {
     return [
-        'addon'                  => 'vs01',
-        'contract_version'       => '1.0',
-        'vs_code'                => $vs_code,
-        'perspective'            => $perspective,
-        'association_slug'       => $association_slug,
-        'association_channel_id' => (string) $channel_id,
-        'submitted_at'           => date('c'),
-        'standing'               => vs01_access_state($association_slug),
-        'fields'                 => $fields,
+        '_header' => [
+            'addon'                  => 'vs01',
+            'contract_version'       => '1.0',
+            'association_slug'       => $association_slug,
+            'association_channel_id' => (string) $channel_id,
+            'participant_id'         => vs01_get_participant_id($association_slug),
+            'submitted_at'           => date('c'),
+            'standing'               => $standing,
+            'node_token_hash'        => hash('sha256', $node_token),
+        ],
+        '_payload' => [
+            'vs_code'     => $vs_code,
+            'perspective' => $perspective,
+            'fields'      => $fields,
+        ],
     ];
 }
 
-// ----------------------------------------------------------------------------
-// ORCHESTRATOR POST
-// ----------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
+// PARTICIPANT ID — Placekey derived from SASE channel address
+// ---------------------------------------------------------------------------
 
-function vs01_post_to_orchestrator($envelope) {
-    $config       = vs01_load_config();
+function vs01_get_participant_id($association_slug) {
+    // The participant_id is the Placekey — the SASE-verified channel address
+    // for this participant, which encodes their postal address.
+    // It is stored in the channel's xchan_addr field.
+    // Format: SASE1-{encoded-address}
+    $observer = get_observer_hash();
+    if (!$observer) return '';
+
+    $r = q("SELECT xchan_addr FROM xchan WHERE xchan_hash = '%s' LIMIT 1",
+        dbesc($observer)
+    );
+    if (!$r) return '';
+
+    // xchan_addr is in the form "channelname@hostname"
+    // The channel name IS the Placekey for SASE participants.
+    $addr  = $r[0]['xchan_addr'] ?? '';
+    $parts = explode('@', $addr);
+    return $parts[0] ?? '';
+}
+
+// ---------------------------------------------------------------------------
+// ORCHESTRATOR POST
+// ---------------------------------------------------------------------------
+
+function vs01_post_to_orchestrator($envelope, $config = null) {
+    if ($config === null) {
+        $config = vs01_load_config();
+    }
     $receiver_url = $config['receiver_url'] ?? '';
-    $node_token   = $config['node_token'] ?? '';
+    $node_token   = $config['node_token']   ?? '';
 
     if (!$receiver_url) {
         logger('vs01_spool: receiver_url not configured');
@@ -166,8 +198,8 @@ function vs01_post_to_orchestrator($envelope) {
         ],
     ]);
 
-    $response = curl_exec($ch);
-    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+    $response   = curl_exec($ch);
+    $http_code  = curl_getinfo($ch, CURLINFO_HTTP_CODE);
     $curl_error = curl_error($ch);
     curl_close($ch);
 
@@ -184,9 +216,9 @@ function vs01_post_to_orchestrator($envelope) {
     return 'Orchestrator error (HTTP ' . $http_code . ').';
 }
 
-// ----------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
 // RE-RENDER FORM WITH SUBMITTED VALUES
-// ----------------------------------------------------------------------------
+// ---------------------------------------------------------------------------
 
 function vs01_render_vs_form_with_values($association_slug, $vs_code, $access, $submitted_values) {
     $schemas = vs01_load_schemas();