diff --git a/openapi.json b/openapi.json
index 0ba51a25..bce5042f 100644
--- a/openapi.json
+++ b/openapi.json
@@ -2130,6 +2130,58 @@
         }
       }
     },
+    "/txs/{hash}/required-signers": {
+      "get": {
+        "tags": [
+          "Cardano » Transactions"
+        ],
+        "summary": "Transaction required signers",
+        "description": "Extra transaction witnesses",
+        "parameters": [
+          {
+            "in": "path",
+            "name": "hash",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "64-character case-sensitive hexadecimal string."
+            },
+            "description": "Hash of the transaction",
+            "example": "6e5f825c82c1c6d6b77f2a14092f3b78c8f1b66db6f4cf8caec1555b6f967b3b"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Query required signers (extra transaction witnesses)",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/tx_content_required_signers"
+                }
+              }
+            }
+          },
+          "400": {
+            "$ref": "#/components/responses/400"
+          },
+          "403": {
+            "$ref": "#/components/responses/403"
+          },
+          "404": {
+            "$ref": "#/components/responses/404"
+          },
+          "418": {
+            "$ref": "#/components/responses/418"
+          },
+          "429": {
+            "$ref": "#/components/responses/429"
+          },
+          "500": {
+            "$ref": "#/components/responses/500"
+          }
+        }
+      }
+    },
     "/tx/submit": {
       "post": {
         "tags": [
@@ -8617,6 +8669,19 @@
           ]
         }
       },
+      "tx_content_required_signers": {
+        "type": "array",
+        "items": {
+          "type": "string",
+          "description": "Hash of the witness"
+        },
+        "example": [
+          "d52e11f3e48436dd42dbec6d88c239732e503b8b7a32af58e5f87625",
+          "41b32682c413535dbca5178f92f3cee5dede31b995400b8c371e2469",
+          "d52e11f3e48436dd42dbec6d88c239732e503b8b7a32af58e5f87625",
+          "666414964a05b01cef36427b8a0fb0f621806c43e66e7a4d3cca3bfb"
+        ]
+      },
       "account_content": {
         "type": "object",
         "properties": {
diff --git a/openapi.yaml b/openapi.yaml
index 805ce4d8..594dfc81 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -1652,6 +1652,40 @@ paths:
           $ref: '#/components/responses/429'
         '500':
           $ref: '#/components/responses/500'
+  /txs/{hash}/required-signers:
+    get:
+      tags:
+        - Cardano » Transactions
+      summary: Transaction required signers
+      description: Extra transaction witnesses
+      parameters:
+        - in: path
+          name: hash
+          required: true
+          schema:
+            type: string
+            format: 64-character case-sensitive hexadecimal string.
+          description: Hash of the transaction
+          example: 6e5f825c82c1c6d6b77f2a14092f3b78c8f1b66db6f4cf8caec1555b6f967b3b
+      responses:
+        '200':
+          description: Query required signers (extra transaction witnesses)
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/tx_content_required_signers'
+        '400':
+          $ref: '#/components/responses/400'
+        '403':
+          $ref: '#/components/responses/403'
+        '404':
+          $ref: '#/components/responses/404'
+        '418':
+          $ref: '#/components/responses/418'
+        '429':
+          $ref: '#/components/responses/429'
+        '500':
+          $ref: '#/components/responses/500'
   /tx/submit:
     post:
       tags:
@@ -6380,6 +6414,16 @@ components:
           - redeemer_data_hash
           - datum_hash
           - fee
+    tx_content_required_signers:
+      type: array
+      items:
+        type: string
+        description: Hash of the witness
+      example:
+        - d52e11f3e48436dd42dbec6d88c239732e503b8b7a32af58e5f87625
+        - 41b32682c413535dbca5178f92f3cee5dede31b995400b8c371e2469
+        - d52e11f3e48436dd42dbec6d88c239732e503b8b7a32af58e5f87625
+        - 666414964a05b01cef36427b8a0fb0f621806c43e66e7a4d3cca3bfb
     account_content:
       type: object
       properties:
diff --git a/src/definitions.yaml b/src/definitions.yaml
index 4aea5da0..0d781eb7 100644
--- a/src/definitions.yaml
+++ b/src/definitions.yaml
@@ -378,6 +378,9 @@ paths:
   /txs/{hash}/redeemers:
     $ref: ./paths/api/txs/{hash}/redeemers.yaml
 
+  /txs/{hash}/required-signers:
+    $ref: ./paths/api/txs/{hash}/required-signers.yaml
+
   /tx/submit:
     $ref: ./paths/api/tx/submit.yaml
 
diff --git a/src/paths/api/txs/{hash}/required-signers.yaml b/src/paths/api/txs/{hash}/required-signers.yaml
new file mode 100644
index 00000000..16ac4c72
--- /dev/null
+++ b/src/paths/api/txs/{hash}/required-signers.yaml
@@ -0,0 +1,33 @@
+get:
+  tags:
+    - Cardano » Transactions
+  summary: Transaction required signers
+  description: Extra transaction witnesses
+  parameters:
+    - in: path
+      name: hash
+      required: true
+      schema:
+        type: string
+        format: 64-character case-sensitive hexadecimal string.
+      description: Hash of the transaction
+      example: "6e5f825c82c1c6d6b77f2a14092f3b78c8f1b66db6f4cf8caec1555b6f967b3b"
+  responses:
+    "200":
+      description: Query required signers (extra transaction witnesses)
+      content:
+        application/json:
+          schema:
+            $ref: ../../../../schemas/txs/tx_content_required_signers.yaml
+    "400":
+      $ref: ../../../../responses/errors/400.yaml
+    "403":
+      $ref: ../../../../responses/errors/403.yaml
+    "404":
+      $ref: ../../../../responses/errors/404.yaml
+    "429":
+      $ref: ../../../../responses/errors/429.yaml
+    "418":
+      $ref: ../../../../responses/errors/418.yaml
+    "500":
+      $ref: ../../../../responses/errors/500.yaml
diff --git a/src/schemas/txs/tx_content_required_signers.yaml b/src/schemas/txs/tx_content_required_signers.yaml
new file mode 100644
index 00000000..8d097e0c
--- /dev/null
+++ b/src/schemas/txs/tx_content_required_signers.yaml
@@ -0,0 +1,9 @@
+type: array
+items:
+  type: string
+  description: Hash of the witness
+example:
+  - "d52e11f3e48436dd42dbec6d88c239732e503b8b7a32af58e5f87625"
+  - "41b32682c413535dbca5178f92f3cee5dede31b995400b8c371e2469"
+  - "d52e11f3e48436dd42dbec6d88c239732e503b8b7a32af58e5f87625"
+  - "666414964a05b01cef36427b8a0fb0f621806c43e66e7a4d3cca3bfb"