diff --git a/103120/examples/json/response1_signed.json b/103120/examples/json/response1_signed.json
new file mode 100644
index 0000000000000000000000000000000000000000..a30a3fff1a4cebd2429da23a7ebf98986b40b232
--- /dev/null
+++ b/103120/examples/json/response1_signed.json
@@ -0,0 +1,52 @@
+{
+  "@xmlns": "http://uri.etsi.org/03120/common/2019/10/Core",
+  "@xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
+  "@xmlns:common": "http://uri.etsi.org/03120/common/2016/02/Common",
+  "@xmlns:task": "http://uri.etsi.org/03120/common/2020/09/Task",
+  "@xmlns:auth": "http://uri.etsi.org/03120/common/2020/09/Authorisation",
+  "Header": {
+    "SenderIdentifier": {
+      "CountryCode": "XX",
+      "UniqueIdentifier": "ACTOR01"
+    },
+    "ReceiverIdentifier": {
+      "CountryCode": "XX",
+      "UniqueIdentifier": "ACTOR02"
+    },
+    "TransactionIdentifier": "c02358b2-76cf-4ba4-a8eb-f6436ccaea2e",
+    "Timestamp": "2015-09-01T12:00:01.000000Z",
+    "Version": {
+      "ETSIVersion": "V1.13.1",
+      "NationalProfileOwner": "XX",
+      "NationalProfileVersion": "v1.0"
+    }
+  },
+  "Payload": {
+    "ResponsePayload": {
+      "ActionResponses": {
+        "ActionResponse": [
+          {
+            "ActionIdentifier": 0,
+            "CREATEResponse": {
+              "Identifier": "7dbbc880-8750-4d3c-abe7-ea4a17646045"
+            }
+          },
+          {
+            "ActionIdentifier": 1,
+            "CREATEResponse": {
+              "Identifier": "2b36a78b-b628-416d-bd22-404e68a0cd36"
+            }
+          }
+        ]
+      }
+    }
+  },
+  "Signatures": [
+    {
+      "hash_algorithm": "sha-256",
+      "algorithm": "Ed25519",
+      "public_key": "MCowBQYDK2VwAyEAubMonBfU9pvIbj5RCiWQLD45Jvu6mKr+kQXjvjW8ZkU",
+      "value": "B6vWORSsHlPfyHOvqEhnyH0vEVI90gfZADeP7uLQPOrYfDKMIZKopcnag9hZH0IrAZhgz5awTgt6AUfRX/fCCA=="
+    }
+  ]
+}
diff --git a/103120/schema/json/ts_103120_Core.schema.json b/103120/schema/json/ts_103120_Core.schema.json
index 3216b8c746ba68d4087c259fc35a651c33d301d6..3098c04998b6a34723420caa523639ecbec882ba 100644
--- a/103120/schema/json/ts_103120_Core.schema.json
+++ b/103120/schema/json/ts_103120_Core.schema.json
@@ -27,6 +27,32 @@
             "protected",
             "signature"
           ]
+        },
+        "Signatures": {
+          "type": "array",
+          "minItems": 1,
+          "items": {
+            "type": "object",
+            "properties": {
+              "hash_algorithm": {
+                "type": "string"
+              },
+              "algorithm": {
+                "type": "string"
+              },
+              "public_key": {
+                "type": "string"
+              },
+              "value": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "hash_algorithm",
+              "algorithm",
+              "value"
+            ]
+          }
         }
       },
       "required": [
diff --git a/103120/schema/xsd/ts_103120_Core.xsd b/103120/schema/xsd/ts_103120_Core.xsd
index 323e8efcc3397f59b244c1a6684afe895a448101..d30f6949d68778ca02ab6c4ea8e34d240b21221f 100644
--- a/103120/schema/xsd/ts_103120_Core.xsd
+++ b/103120/schema/xsd/ts_103120_Core.xsd
@@ -13,6 +13,8 @@
             <xs:element name="Signature" minOccurs="0"/>
             <!-- Use of the Signature element is discouraged – implementers are encouraged use the digsig:Signature element below instead -->
             <xs:element ref="digsig:Signature" minOccurs="0"/>
+            <!-- The Signatures element is introduced for JSS support, and is not intended for use in XML-format instance documents.-->
+            <xs:element name="Signatures" minOccurs="0"/>
         </xs:sequence>
     </xs:complexType>
     <xs:complexType name="MessageHeader">
diff --git a/utils/translate_spec.py b/utils/translate_spec.py
index 6ce2f843a17646a88ffde26041a2068805955b8f..6e3c987f23468941e8677ee6a1eec0881690db16 100644
--- a/utils/translate_spec.py
+++ b/utils/translate_spec.py
@@ -12,7 +12,13 @@ logging.basicConfig(level=logging.INFO)
 
 json_signature_struct = {
     "properties": {"protected": {"type": "string"}, "signature": {"type": "string"}},
-    "required": ["protected", "signature"],
+    "required": ["protected", "signature"]
+}
+
+json_x590_signature_struct = {
+    "type": "array", "minItems": 1, "items": {"type": "object",
+    "properties": {"hash_algorithm": {"type": "string"}, "algorithm": {"type": "string"}, "public_key": {"type": "string"}, "value": {"type": "string"}  }
+    "required": ["hash_algorithm", "algorithm", "value"] }
 }
 
 
@@ -89,6 +95,8 @@ if __name__ == "__main__":
             js["$defs"]["HI1Message"]["patternProperties"] = {"^@": {"type": "string"}}
             js["$defs"]["HI1Message"]["properties"].pop("xmldsig:Signature")
             js["$defs"]["HI1Message"]["properties"]["Signature"] = json_signature_struct
+            js["$defs"]["HI1Message"]["properties"]["Signatures"] = json_x590_signature_struct
+
 
         if "output" in ns_map[schema_tuple[0]]:
             js_path = Path(ns_map[schema_tuple[0]]["output"]) / convert_xsd_to_filename(