diff --git a/src/com/openattestation/4.0/alpha-schema.json b/src/com/openattestation/4.0/alpha-schema.json
index 73189a5..920ad9d 100644
--- a/src/com/openattestation/4.0/alpha-schema.json
+++ b/src/com/openattestation/4.0/alpha-schema.json
@@ -76,6 +76,7 @@
       "required": ["id", "name", "identityProof"]
     },
     "credentialStatus": {
+      "type": "object",
       "oneOf": [
         {
           "type": "object",
@@ -88,7 +89,8 @@
               "enum": ["NONE"]
             }
           },
-          "required": ["credentialStatusType"]
+          "required": ["credentialStatusType"],
+          "additionalProperties": false
         },
         {
           "type": "object",
@@ -106,7 +108,8 @@
               "examples": ["https://ocsp-responder.example.com"]
             }
           },
-          "required": ["credentialStatusType", "location"]
+          "required": ["credentialStatusType", "location"],
+          "additionalProperties": false
         }
       ]
     },
@@ -159,47 +162,9 @@
         "key": { "type": "string" },
         "signature": { "type": "string" }
       },
-      "required": ["proofPurpose", "targetHash", "proofs", "merkleRoot", "salts", "privacy", "key", "signature"],
+      "required": ["proofPurpose", "targetHash", "proofs", "merkleRoot", "salts", "privacy"],
       "additionalProperties": false
-    },
-    "network": {
-      "type": "object",
-      "properties": {
-        "chain": {
-          "type": "string",
-          "examples": ["ETH"],
-          "description": "Which blockchain being used"
-        },
-        "chainId": {
-          "type": "number",
-          "examples": [5],
-          "description": "Chain ID of the network used"
-        }
-      },
-      "required": ["chain", "chainId"]
-    },
-    "attachments": {
-      "type": "array",
-      "items": {
-        "type": "object",
-        "properties": {
-          "fileName": {
-            "type": "string",
-            "description": "Name of this attachment, with appropriate extensions"
-          },
-          "mimeType": {
-            "type": "string",
-            "description": "Media type (or MIME type) of this attachment"
-          },
-          "data": {
-            "type": "string",
-            "description": "Base64 encoding of this attachment"
-          }
-        },
-        "required": ["fileName", "mimeType", "data"],
-        "additionalProperties": false
-      }
     }
   },
-  "required": ["@context", "issuer", "credentialStatus", "credentialSubject", "proof"]
+  "required": ["@context", "issuer", "credentialStatus", "credentialSubject"]
 }