diff --git a/signing/paths/public_keys.yaml b/signing/paths/public_keys.yaml
index 59f38d1..e3bf38b 100644
--- a/signing/paths/public_keys.yaml
+++ b/signing/paths/public_keys.yaml
@@ -12,8 +12,19 @@ get:
           schema:
             type: array
             items:
-              type: string
-              example: '0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a'
+              oneOf:  
+                - type: string
+                - type: object
+                  properties:
+                    pubkey:
+                      type: string
+                    block_properties:
+                      type: array
+                      items:
+                        type: string
+            example: 
+              - pubkey: '0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a'
+                block_properties: ['.execution_payload.fee_recipient', '.graffiti']
     '400':
       description: 'Bad request format'
     '500':
diff --git a/signing/paths/sign.yaml b/signing/paths/sign.yaml
index dadb8ee..b8c1d79 100644
--- a/signing/paths/sign.yaml
+++ b/signing/paths/sign.yaml
@@ -49,6 +49,17 @@ post:
           BLOCK_V2 (DENEB):
             value:
               type: "BLOCK_V2"
+              proofs:
+                - index: "401"
+                  proof: 
+                  - "0x779b271e405f605a48317e56cac7d45363866a55dd4e0895f4df104d09e7a192"
+                  - "0x644d4588f408c24fe29e8ca8b668d6cffcedd9496682cda1ad564532f67f58f9"
+                  - "0xb4a81f606555f57fa28b1a394acfc79a2c4b4a12cb406fc4efba434833732322"
+                  - "0xdc07f92f1f0079b9724556f0e74b30b816b20beb9dd98629a5d85d7ff1ee7276"
+                  - "0xface4c8dc79e2dad391b534b69530d4470eb551927548555854d2022fe2b22a0"
+                  - "0x336488033fe5f3ef4ccc12af07b9370b92e553e35ecb4a337a1b1c0e4afe1e0e"
+                  - "0xdb56114e00fdd4c1f85c892bf35ac9a89289aaecb1ebd0a96cde606a748b5d71"
+                  - "0x60ba834cd8f04bb6edf3276fc70d9731148ee1c8e1efd6b7c685f82e721176ef"
               signingRoot: "0xaa2e0c465c1a45d7b6637fcce4ad6ceb71fc12064b548078d619a411f0de8adc"
               fork_info:
                 fork:
@@ -65,8 +76,19 @@ post:
                   state_root: "0xfd18cf40cc907a739be483f1ca0ee23ad65cdd3df23205eabc6d660a75d1f54e"
                   body_root: "0xa759d8029a69d4fdd8b3996086e9722983977e4efc1f12f4098ea3d93e868a6b"
           BLOCK_V2 (CAPELLA):
-            value:
+            value:   
               type: "BLOCK_V2"
+              proofs:
+                - index: "401"
+                  proof: 
+                  - "0x779b271e405f605a48317e56cac7d45363866a55dd4e0895f4df104d09e7a192"
+                  - "0x644d4588f408c24fe29e8ca8b668d6cffcedd9496682cda1ad564532f67f58f9"
+                  - "0xb4a81f606555f57fa28b1a394acfc79a2c4b4a12cb406fc4efba434833732322"
+                  - "0xdc07f92f1f0079b9724556f0e74b30b816b20beb9dd98629a5d85d7ff1ee7276"
+                  - "0xface4c8dc79e2dad391b534b69530d4470eb551927548555854d2022fe2b22a0"
+                  - "0x336488033fe5f3ef4ccc12af07b9370b92e553e35ecb4a337a1b1c0e4afe1e0e"
+                  - "0xdb56114e00fdd4c1f85c892bf35ac9a89289aaecb1ebd0a96cde606a748b5d71"
+                  - "0x60ba834cd8f04bb6edf3276fc70d9731148ee1c8e1efd6b7c685f82e721176ef"
               signingRoot: "0xaa2e0c465c1a45d7b6637fcce4ad6ceb71fc12064b548078d619a411f0de8adc"
               fork_info:
                 fork:
diff --git a/signing/schemas.yaml b/signing/schemas.yaml
index b987b7e..9da34bb 100644
--- a/signing/schemas.yaml
+++ b/signing/schemas.yaml
@@ -1,5 +1,29 @@
 components:
   schemas:
+    Verifying:
+      type: "object"
+      properties:
+        proofs:
+          type: "array"
+          nullable: true
+          items:
+            type: "object"
+            properties:
+              proof:
+                type: "array"
+                description: Merkle proof against the block body root included in the request
+                items:
+                  $ref: "#/components/schemas/Proof"
+              index:
+                type: "string"
+                description: Generalized index of the field
+                example: "401"
+            required:
+              - proof
+              - index
+    Proof:
+      type: "string"
+      example: "0x779b271e405f605a48317e56cac7d45363866a55dd4e0895f4df104d09e7a192"
     Signing:
       type: "object"
       properties:
@@ -472,6 +496,7 @@ components:
           type: string
     BeaconBlockSigning:
       allOf:
+        - $ref: '#/components/schemas/Verifying'
         - $ref: '#/components/schemas/Signing'
         - $ref: '#/components/schemas/BeaconBlockRequest'
         - type: object
@@ -480,7 +505,6 @@ components:
               type: "string"
               description: Signing Request type
               example: 'BLOCK_V2'
-
     BeaconBlockRequest:
       type: object
       properties: