diff --git a/workplans/WHITEHAT-WP-0004-canonical-custody-binding.md b/workplans/WHITEHAT-WP-0004-canonical-custody-binding.md
index dd642dd..c02a770 100644
--- a/workplans/WHITEHAT-WP-0004-canonical-custody-binding.md
+++ b/workplans/WHITEHAT-WP-0004-canonical-custody-binding.md
@@ -12,6 +12,7 @@ updated: "2026-08-22"
 related:
   - WHITEHAT-WP-0003
   - RAILIANCE-WP-0025
+state_hub_workstream_id: "779ad220-2ce3-5117-aec8-bb4a97d43d98"
 ---
 
 # WHITEHAT-WP-0004 — canonical custody binding
@@ -42,6 +43,7 @@ broker digest, times, and canonical receipt id.
 id: WHITEHAT-WP-0004-T01
 status: done
 priority: high
+state_hub_task_id: "e3cf7d58-de89-5f6f-b411-297418bdd79a"
 ```
 
 `PlatformCustodyBroker` and `admit-plane` refuse a WP-0025 projection receipt