diff --git a/hubzilla/addon/scn01/scn01_spool.php b/hubzilla/addon/scn01/scn01_spool.php
index 2172b5d..55e5199 100644
--- a/hubzilla/addon/scn01/scn01_spool.php
+++ b/hubzilla/addon/scn01/scn01_spool.php
@@ -2,7 +2,7 @@
 
 /**
  * SCN-01 Spool Handler
- * Validates POST submissions, builds the spool envelope,
+ * Validates POST submissions, builds the spool envelope with VS and DSC snapshots,
  * and POSTs to the orchestrator receiver.
  * Records are immutable — no edit path.
  */
@@ -35,19 +35,42 @@ function scn01_handle_post($association_slug, $access) {
         return $out;
     }
 
+    // Load association config from vs01 (shared source of association data)
     $cfg_raw = @file_get_contents('addon/vs01/config.json');
     $cfg     = $cfg_raw ? json_decode($cfg_raw, true) : [];
     $assoc   = $cfg['associations'][$association_slug] ?? [];
 
+    // Load scn01 config for receiver_url and node_token
+    $scn_config = scn01_load_config();
+
+    // Load VS and DSC snapshots for this participant.
+    // These are embedded in the Scenario envelope — the record must be self-contained.
+    $participant_id = scn01_get_participant_id();
+    $vs_snapshot    = scn01_load_vs_snapshot($participant_id, $association_slug);
+    $dsc_snapshot   = scn01_load_dsc_snapshot($participant_id, $association_slug);
+
+    // Prerequisite gate: both VS and DSC sets must exist before a Scenario can be submitted.
+    if (empty($vs_snapshot) || empty($dsc_snapshot)) {
+        return '<div class="alert alert-warning">
+                    <strong>Please complete your Vital Signs and DSC Category records first.</strong>
+                    Your Vital Signs and DSC records establish the context for any Scenario you submit.
+                    <a href="' . z_root() . '/vs01/' . scn01_h($association_slug) . '">Complete Vital Signs</a> |
+                    <a href="' . z_root() . '/dsc01/' . scn01_h($association_slug) . '">Complete DSC Categories</a>
+                </div>';
+    }
+
     $envelope = scn01_build_spool_envelope(
         $narrative,
         $pinned,
         $association_slug,
         $assoc['channel_id'] ?? '',
-        $access
+        $access,
+        $vs_snapshot,
+        $dsc_snapshot,
+        $scn_config['node_token'] ?? ''
     );
 
-    $result = scn01_post_to_orchestrator($envelope);
+    $result = scn01_post_to_orchestrator($envelope, $scn_config);
 
     if ($result === true) {
         $assoc_name = scn01_h($assoc['name'] ?? $association_slug);
@@ -71,19 +94,81 @@ function scn01_handle_post($association_slug, $access) {
 }
 
 // ---------------------------------------------------------------------------
-// SPOOL ENVELOPE
+// SNAPSHOT LOADERS
+// Read the participant's current VS and DSC records from the orchestrator's
+// stored JSON files. These are embedded verbatim in the Scenario envelope.
 // ---------------------------------------------------------------------------
 
-function scn01_build_spool_envelope($narrative, $pinned_scenario_ids, $association_slug, $channel_id, $standing) {
+function scn01_load_vs_snapshot($participant_id, $association_slug) {
+    if (!$participant_id || !$association_slug) return [];
+    // VS records are stored by the orchestrator at a known path.
+    // On the Hubzilla node we read the stored record via the orchestrator's
+    // GET endpoint — but since there is no GET endpoint yet, we read
+    // from pconfig as the interim source.
+    // When a GET /vs01/record endpoint is added to the orchestrator,
+    // this function should be updated to call it instead.
+    $stored = get_pconfig(local_channel(), 'vs01_snapshot', $association_slug);
+    if ($stored) {
+        $data = json_decode($stored, true);
+        if (json_last_error() === JSON_ERROR_NONE) return $data;
+    }
+    return [];
+}
+
+function scn01_load_dsc_snapshot($participant_id, $association_slug) {
+    if (!$participant_id || !$association_slug) return [];
+    $stored = get_pconfig(local_channel(), 'dsc01_snapshot', $association_slug);
+    if ($stored) {
+        $data = json_decode($stored, true);
+        if (json_last_error() === JSON_ERROR_NONE) return $data;
+    }
+    return [];
+}
+
+// ---------------------------------------------------------------------------
+// PARTICIPANT ID
+// ---------------------------------------------------------------------------
+
+function scn01_get_participant_id() {
+    $observer = get_observer_hash();
+    if (!$observer) return '';
+
+    $r = q("SELECT xchan_addr FROM xchan WHERE xchan_hash = '%s' LIMIT 1",
+        dbesc($observer)
+    );
+    if (!$r) return '';
+
+    $addr  = $r[0]['xchan_addr'] ?? '';
+    $parts = explode('@', $addr);
+    return $parts[0] ?? '';
+}
+
+// ---------------------------------------------------------------------------
+// SPOOL ENVELOPE
+// Matches contracts/scn01/record-v1.json — _header / _payload / _credentials.
+// ---------------------------------------------------------------------------
+
+function scn01_build_spool_envelope($narrative, $pinned_scenario_ids, $association_slug, $channel_id, $standing, $vs_snapshot, $dsc_snapshot, $node_token) {
     return [
-        'addon'                   => 'scn01',
-        'contract_version'        => '1.0',
-        'association_slug'        => $association_slug,
-        'association_channel_id'  => (string) $channel_id,
-        'submitted_at'            => date('c'),
-        'standing'                => $standing,
-        'pinned_scenario_ids'     => $pinned_scenario_ids,
-        'narrative'               => $narrative,
+        '_header' => [
+            'addon'                  => 'scn01',
+            'contract_version'       => '1.0',
+            'association_slug'       => $association_slug,
+            'association_channel_id' => (string) $channel_id,
+            'participant_id'         => scn01_get_participant_id(),
+            'submitted_at'           => date('c'),
+            'standing'               => $standing,
+            'node_token_hash'        => hash('sha256', $node_token),
+        ],
+        '_payload' => [
+            'pinned_scenario_ids' => $pinned_scenario_ids,
+            'narrative'           => $narrative,
+            'vs_snapshot'         => $vs_snapshot,
+            'dsc_snapshot'        => $dsc_snapshot,
+        ],
+        '_credentials' => [
+            'g1_tx_hash' => null,  // populated when Ğ1 payment is wired
+        ],
     ];
 }
 
@@ -91,10 +176,12 @@ function scn01_build_spool_envelope($narrative, $pinned_scenario_ids, $associati
 // ORCHESTRATOR POST
 // ---------------------------------------------------------------------------
 
-function scn01_post_to_orchestrator($envelope) {
-    $config       = scn01_load_config();
+function scn01_post_to_orchestrator($envelope, $config = null) {
+    if ($config === null) {
+        $config = scn01_load_config();
+    }
     $receiver_url = $config['receiver_url'] ?? '';
-    $node_token   = $config['node_token'] ?? '';
+    $node_token   = $config['node_token']   ?? '';
 
     if (!$receiver_url) {
         logger('scn01_spool: receiver_url not configured');