diff --git a/103120/examples/json/request_jss.json b/103120/examples/json/request_jss.json
new file mode 100644
index 0000000000000000000000000000000000000000..d8334ea53326f58314e5300bcbd944364e5e9a36
--- /dev/null
+++ b/103120/examples/json/request_jss.json
@@ -0,0 +1,104 @@
+{
+  "@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": "2015-09-01T12:00:00.000000Z",
+    "Version": {
+      "ETSIVersion": "V1.13.1",
+      "NationalProfileOwner": "XX",
+      "NationalProfileVersion": "v1.0"
+    }
+  },
+  "Payload": {
+    "RequestPayload": {
+      "ActionRequests": {
+        "ActionRequest": [
+          {
+            "ActionIdentifier": 0,
+            "CREATE": {
+              "HI1Object": {
+                "@xsi:type": "{http://uri.etsi.org/03120/common/2020/09/Authorisation}AuthorisationObject",
+                "ObjectIdentifier": "7dbbc880-8750-4d3c-abe7-ea4a17646045",
+                "CountryCode": "XX",
+                "OwnerIdentifier": "ACTOR01",
+                "auth:AuthorisationReference": "W000001",
+                "auth:AuthorisationTimespan": {
+                  "auth:StartTime": "2015-09-01T12:00:00Z",
+                  "auth:EndTime": "2015-12-01T12:00:00Z"
+                }
+              }
+            }
+          },
+          {
+            "ActionIdentifier": 1,
+            "CREATE": {
+              "HI1Object": {
+                "@xsi:type": "{http://uri.etsi.org/03120/common/2020/09/Task}LITaskObject",
+                "ObjectIdentifier": "2b36a78b-b628-416d-bd22-404e68a0cd36",
+                "CountryCode": "XX",
+                "OwnerIdentifier": "ACTOR01",
+                "AssociatedObjects": {
+                  "AssociatedObject": [
+                    "7dbbc880-8750-4d3c-abe7-ea4a17646045"
+                  ]
+                },
+                "task:Reference": "LIID1",
+                "task:TargetIdentifier": {
+                  "task:TargetIdentifierValues": {
+                    "task:TargetIdentifierValue": [
+                      {
+                        "task:FormatType": {
+                          "task:FormatOwner": "ETSI",
+                          "task:FormatName": "InternationalE164"
+                        },
+                        "task:Value": "442079460223"
+                      }
+                    ]
+                  }
+                },
+                "task:DeliveryType": {
+                  "common:Owner": "ETSI",
+                  "common:Name": "TaskDeliveryType",
+                  "common:Value": "IRIandCC"
+                },
+                "task:DeliveryDetails": {
+                  "task:DeliveryDestination": [
+                    {
+                      "task:DeliveryAddress": {
+                        "task:IPv4Address": "192.0.2.0"
+                      }
+                    }
+                  ]
+                },
+                "task:CSPID": {
+                  "CountryCode": "XX",
+                  "UniqueIdentifier": "RECVER01"
+                }
+              }
+            }
+          }
+        ]
+      }
+    }
+  },
+  "signatures": [
+    {
+      "hash_algorithm": "sha-256",
+      "algorithm": "Ed448",
+      "public_key": "MEMwBQYDK2VxAzoAPTyXPyIqU1VWCuEml1VjvnBYv2I+AvNteIGsTtVc2pT7erIVLDdJRq18tDhZifqW0WGYSy0yVYQA",
+      "value": "0hV3KVF91PzSWVQiDeDVhqjPW4/EdOClsDWDaEcSy9/raxTUy5cmFZbV/BMI0yCuHXErd53HDkCAc4tS7rg0pwZsh0XOindp8rX6BMWIpZ4FYOA4r5DCW2G1rokXPbpKd4VuGr1wk2AEBCqSzWp02zgA"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/103120/examples/json/request_jss_private_key.txt b/103120/examples/json/request_jss_private_key.txt
new file mode 100644
index 0000000000000000000000000000000000000000..77c0a76304b3ce96056c8acfba0d825e617fd02d
--- /dev/null
+++ b/103120/examples/json/request_jss_private_key.txt
@@ -0,0 +1,4 @@
+-----BEGIN PRIVATE KEY-----
+MEcCAQAwBQYDK2VxBDsEOSorOHhQFkvXmylksjqu3I8oIogfarelL6o/t6n9SKy5
+grmgVExkD8fOlx++Mxe2fcyaHcEeSERuCA==
+-----END PRIVATE KEY-----
\ No newline at end of file
diff --git a/103120/examples/json/request_jss_public_key.txt b/103120/examples/json/request_jss_public_key.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fc58e7a8a2f7409befcf3342a058684b5e1f641e
--- /dev/null
+++ b/103120/examples/json/request_jss_public_key.txt
@@ -0,0 +1,4 @@
+-----BEGIN PUBLIC KEY-----
+MEMwBQYDK2VxAzoAPTyXPyIqU1VWCuEml1VjvnBYv2I+AvNteIGsTtVc2pT7erIV
+LDdJRq18tDhZifqW0WGYSy0yVYQA
+-----END PUBLIC KEY-----
\ No newline at end of file
diff --git a/103120/schema/json/ts_103120_Core.schema.json b/103120/schema/json/ts_103120_Core.schema.json
index 3216b8c746ba68d4087c259fc35a651c33d301d6..69a7f7aa0f558803484a688c0ab1659d4807bc52 100644
--- a/103120/schema/json/ts_103120_Core.schema.json
+++ b/103120/schema/json/ts_103120_Core.schema.json
@@ -14,6 +14,32 @@
         "Payload": {
           "$ref": "#/$defs/MessagePayload"
         },
+        "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"
+              ]
+            }
+          },
         "Signature": {
           "properties": {
             "protected": {
@@ -29,6 +55,44 @@
           ]
         }
       },
+      "oneOf": [
+        {
+          "required": [
+            "Signatures"
+          ],
+          "not": {
+            "required": [
+              "Signature"
+            ]
+          }
+        },
+        {
+          "required": [
+            "Signature"
+          ],
+          "not": {
+            "required": [
+              "Signatures"
+            ]
+          }
+        },
+        {
+          "not": {
+            "anyOf": [
+              {
+                "required": [
+                  "Signatures"
+                ]
+              },
+              {
+                "required": [
+                  "Signature"
+                ]
+              }
+            ]
+          }
+        }
+      ],
       "required": [
         "Header",
         "Payload"