diff --git a/rust/signed_doc/meta.schema.json b/rust/signed_doc/meta.schema.json
index 88cfec84a..fad6bf93d 100644
--- a/rust/signed_doc/meta.schema.json
+++ b/rust/signed_doc/meta.schema.json
@@ -2,29 +2,33 @@
 {
     "$schema": "http://json-schema.org/draft-07/schema#",
     "description": "Catalyst signed document metadata json schema",
-    "type": "object",
-    "additionalProperties": false,
-    "properties": {
-        "type": {
+    "definitions": {
+        "uuidv4": {
             "type": "string",
             "format": "uuid",
             "examples": [
                 "0ce8ab38-9258-4fbc-a62e-7faa6e58318f"
             ]
         },
-        "id": {
+        "uuidv7": {
             "type": "string",
-            "format": "ulid",
+            "format": "uuid",
             "examples": [
-                "01JE99R792FWCQFZPHJH1R87RB"
+                "0193ae7c-8131-7fe6-91f0-b451ea229b11"
             ]
+        }
+    },
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+        "type": {
+            "$ref": "#/definitions/uuidv4"
+        },
+        "id": {
+            "$ref": "#/definitions/uuidv7"
         },
         "ver": {
-            "type": "string",
-            "format": "ulid",
-            "examples": [
-                "01JE99R792FWCQFZPHJH1R87RB"
-            ]
+            "$ref": "#/definitions/uuidv7"
         },
         "ref": {
             "anyOf": [
@@ -32,8 +36,7 @@
                     "type": "object",
                     "properties": {
                         "id": {
-                            "type": "string",
-                            "format": "ulid"
+                            "$ref": "#/definitions/uuidv7"
                         }
                     }
                 },
@@ -41,12 +44,10 @@
                     "type": "object",
                     "properties": {
                         "id": {
-                            "type": "string",
-                            "format": "ulid"
+                            "$ref": "#/definitions/uuidv7"
                         },
                         "ver": {
-                            "type": "string",
-                            "format": "ulid"
+                            "$ref": "#/definitions/uuidv7"
                         }
                     }
                 }
@@ -58,8 +59,7 @@
                     "type": "object",
                     "properties": {
                         "id": {
-                            "type": "string",
-                            "format": "ulid"
+                            "$ref": "#/definitions/uuidv7"
                         }
                     }
                 },
@@ -67,12 +67,10 @@
                     "type": "object",
                     "properties": {
                         "id": {
-                            "type": "string",
-                            "format": "ulid"
+                            "$ref": "#/definitions/uuidv7"
                         },
                         "ver": {
-                            "type": "string",
-                            "format": "ulid"
+                            "$ref": "#/definitions/uuidv7"
                         }
                     }
                 }
@@ -84,8 +82,7 @@
                     "type": "object",
                     "properties": {
                         "id": {
-                            "type": "string",
-                            "format": "ulid"
+                            "$ref": "#/definitions/uuidv7"
                         }
                     }
                 },
@@ -93,12 +90,10 @@
                     "type": "object",
                     "properties": {
                         "id": {
-                            "type": "string",
-                            "format": "ulid"
+                            "$ref": "#/definitions/uuidv7"
                         },
                         "ver": {
-                            "type": "string",
-                            "format": "ulid"
+                            "$ref": "#/definitions/uuidv7"
                         }
                     }
                 }
@@ -113,4 +108,4 @@
         "id",
         "ver"
     ]
-}
\ No newline at end of file
+}