diff --git a/go/seatlist/bootstrap/mesh-delivery-checker.json b/go/seatlist/bootstrap/mesh-delivery-checker.json
index 90f99cc..4354b5c 100644
--- a/go/seatlist/bootstrap/mesh-delivery-checker.json
+++ b/go/seatlist/bootstrap/mesh-delivery-checker.json
@@ -140,6 +140,40 @@
           "ended"
         ]
       }
+    },
+    {
+      "name": "input",
+      "description": "A checking program's input the checker keeps, by the sha256 of its exact bytes: the facts of a check its verdict is asked of, or the heads its seat list is asked of, as a run ask names it (its input's verb and digest). Answers the digest and the bytes, base64; a digest it keeps no input of is an error. Asked by the build module that runs the program, as its manifest's invokes grants it. Read-only.",
+      "optional": true,
+      "input": {
+        "type": "object",
+        "properties": {
+          "digest": {
+            "type": "string",
+            "description": "the input's sha256, 64 lowercase hex digits, as the run ask names it"
+          }
+        },
+        "required": [
+          "digest"
+        ]
+      },
+      "answer": {
+        "type": "object",
+        "properties": {
+          "digest": {
+            "type": "string",
+            "description": "the digest asked"
+          },
+          "input": {
+            "type": "string",
+            "description": "the input's exact bytes, base64, so no encoding on the way changes a byte the digest covers"
+          }
+        },
+        "required": [
+          "digest",
+          "input"
+        ]
+      }
     }
   ],
   "description": "The merge check's tries: start one, read one, end one. The checker's own events stay under its own subjects (ADR 0620 §2).",
@@ -455,6 +489,65 @@
                     "to"
                   ]
                 }
+              },
+              "judged-by": {
+                "type": "object",
+                "description": "the checking program that judged the check: where it was built, the key its build is kept under, whether this check's run built it, and the heads it read (ADR 0644, ADR 0656). Absent in a value written before it",
+                "properties": {
+                  "program": {
+                    "type": "object",
+                    "properties": {
+                      "repository": {
+                        "type": "string"
+                      },
+                      "commit": {
+                        "type": "string"
+                      },
+                      "dir": {
+                        "type": "string"
+                      },
+                      "package": {
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "repository",
+                      "commit",
+                      "dir",
+                      "package"
+                    ]
+                  },
+                  "key": {
+                    "type": "string",
+                    "description": "program- and 16 hex digits"
+                  },
+                  "built": {
+                    "type": "boolean"
+                  },
+                  "heads": {
+                    "type": "array",
+                    "items": {
+                      "type": "object",
+                      "properties": {
+                        "repository": {
+                          "type": "string"
+                        },
+                        "commit": {
+                          "type": "string"
+                        }
+                      },
+                      "required": [
+                        "repository",
+                        "commit"
+                      ]
+                    }
+                  }
+                },
+                "required": [
+                  "program",
+                  "key",
+                  "heads"
+                ]
               }
             },
             "required": [