diff --git a/public/rpc_schemas/chain_getBlockHash.json b/public/rpc_schemas/chain_getBlockHash.json
index da404f5..3172ec3 100644
--- a/public/rpc_schemas/chain_getBlockHash.json
+++ b/public/rpc_schemas/chain_getBlockHash.json
@@ -2,13 +2,6 @@
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "title": "chain_getBlockHash params",
   "oneOf": [
-    {
-      "type": "object",
-      "description": "{} or { blockNumber }.",
-      "maxProperties": 1,
-      "additionalProperties": false,
-      "properties": { "blockNumber": { "type": "number" } }
-    },
     {
       "type": "array",
       "description": "[] or [blockNumber].",
diff --git a/public/rpc_schemas/state_getReadProof.json b/public/rpc_schemas/state_getReadProof.json
index 21bcdec..790194d 100644
--- a/public/rpc_schemas/state_getReadProof.json
+++ b/public/rpc_schemas/state_getReadProof.json
@@ -2,20 +2,6 @@
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "title": "state_getReadProof params",
   "oneOf": [
-    {
-      "type": "object",
-      "description": "{ keys } or { keys, at }.",
-      "required": ["keys"],
-      "additionalProperties": false,
-      "properties": {
-        "keys": {
-          "type": "array",
-          "description": "Storage keys to prove.",
-          "items": { "$ref": "./common.json#/$defs/hex" }
-        },
-        "at": { "$ref": "./common.json#/$defs/hex" }
-      }
-    },
     {
       "type": "array",
       "description": "[keys] or [keys, at].",
@@ -29,6 +15,21 @@
         },
         { "$ref": "./common.json#/$defs/hex" }
       ]
+    },
+    {
+      "type": "object",
+      "description": "{ keys } or { keys, at } or { keys, hash }.",
+      "required": ["keys"],
+      "additionalProperties": false,
+      "properties": {
+        "keys": {
+          "type": "array",
+          "description": "Storage keys to prove.",
+          "items": { "$ref": "./common.json#/$defs/hex" }
+        },
+        "at": { "$ref": "./common.json#/$defs/hex" },
+        "hash": { "$ref": "./common.json#/$defs/hex" }
+      }
     }
   ]
 }
diff --git a/src/pages/RpcCalls/RpcCalls.tsx b/src/pages/RpcCalls/RpcCalls.tsx
index 8dc8f0b..fc79ec3 100644
--- a/src/pages/RpcCalls/RpcCalls.tsx
+++ b/src/pages/RpcCalls/RpcCalls.tsx
@@ -27,7 +27,7 @@ export const RpcCalls = withSubscribe(
     const methods = useStateObservable(chainRpcMethods$)
     const setSchema = useRef<((method: string | null) => void) | null>(null)
     const [method, _setMethod] = useState<string | null>(null)
-    const [params, setParams] = useState<string>("{\n  \n}")
+    const [params, setParams] = useState<string>("[\n  \n]")
     const theme = useTheme()
 
     const setMethod = (method: string | null) => {
@@ -77,28 +77,25 @@ export const RpcCalls = withSubscribe(
                 if (!model) return
 
                 setSchema.current = (method) => {
-                  monaco.languages.json.jsonDefaults.setDiagnosticsOptions(
-                    method
-                      ? {
-                          validate: true,
-                          schemas: [
-                            {
-                              uri: `${SCHEMA_URL}/rpc_schemas/${method}.json`,
-                              fileMatch: [model.uri.toString()],
-                            },
-                          ],
-                          enableSchemaRequest: true,
-                          schemaRequest: "ignore",
-                        }
-                      : {
-                          validate: false,
-                        },
-                  )
+                  monaco.languages.json.jsonDefaults.setDiagnosticsOptions({
+                    validate: true,
+                    schemas: method
+                      ? [
+                          {
+                            uri: `${SCHEMA_URL}/rpc_schemas/${method}.json`,
+                            fileMatch: [model.uri.toString()],
+                          },
+                        ]
+                      : [],
+                    enableSchemaRequest: true,
+                    schemaRequest: "ignore",
+                  })
                   monaco.languages.json.jsonDefaults.setModeConfiguration(
                     method
-                      ? { completionItems: true }
+                      ? { completionItems: true, diagnostics: true }
                       : {
                           completionItems: false,
+                          diagnostics: true,
                         },
                   )
                 }