diff --git a/.repository-projection.json b/.repository-projection.json
index ae2fe1c..3bbdf68 100644
--- a/.repository-projection.json
+++ b/.repository-projection.json
@@ -3,11 +3,11 @@
   "projection": "api",
   "projectionSchemaVersion": 1,
   "sourceRepository": "dx-corp/mono",
-  "sourceSha": "c27319825e1c40e34be35016e71b4553c4313dc0",
+  "sourceSha": "274db22a3ad92a0a22c45c0ecbc770f92c9d053d",
   "destinationRepository": "dx-corp/api",
-  "priorProjectedBase": "9b8d355e944a1d6210a236180ee66487d65406c1",
+  "priorProjectedBase": "27c2c4cbcb7929dea8fa943c4de35d28f1e15069",
   "definitionDigest": "144b18a5c1f3e7ee6e2d1abc32f80a97adfeacd088911ec659d63622fe85d18c",
   "toolDigest": "898e8657d9153a2a51d7c283bf83bb3350b5d1e6",
-  "contentDigest": "a9ccfd1e655995ca89d08ca2597ee4720c5e6b0d0ee4b6341c8efb0bc07ebc9d",
+  "contentDigest": "eaa7dad3c2688e4460f1a887419a629eb6c977c81a199cab9151ee636a791ac9",
   "publicationEligible": true
 }
diff --git a/openapi/platform/v1/platform.openapi.yaml b/openapi/platform/v1/platform.openapi.yaml
index ace3453..f1d113c 100644
--- a/openapi/platform/v1/platform.openapi.yaml
+++ b/openapi/platform/v1/platform.openapi.yaml
@@ -2016,6 +2016,11 @@ components:
               - 0
           title: required_independence
           $ref: '#/components/schemas/platform.v1.WorkRemediationEvidenceIndependence'
+        observerCatalogDigest:
+          type: string
+          title: observer_catalog_digest
+          minLength: 1
+          description: Pins the read contract used to independently verify this condition.
       title: WorkRemediationPostcondition
       required:
         - target
diff --git a/proto/platform/v1/platform.proto b/proto/platform/v1/platform.proto
index 1c3f077..00c1149 100644
--- a/proto/platform/v1/platform.proto
+++ b/proto/platform/v1/platform.proto
@@ -307,6 +307,8 @@ message WorkRemediationPostcondition {
     defined_only: true
     not_in: [0]
   }];
+  // Pins the read contract used to independently verify this condition.
+  string observer_catalog_digest = 7 [(buf.validate.field).string.min_len = 1];
 }
 
 // A typed extension of Platform Work, not a separate execution or approval