diff --git a/package.json b/package.json
index 298ce46ae..0abc676ab 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@snapshot-labs/snapshot.js",
-  "version": "0.12.19",
+  "version": "0.12.20",
   "repository": "snapshot-labs/snapshot.js",
   "license": "MIT",
   "main": "dist/snapshot.cjs.js",
diff --git a/src/schemas/proposal.json b/src/schemas/proposal.json
index b4dc7af70..8a0fb9421 100644
--- a/src/schemas/proposal.json
+++ b/src/schemas/proposal.json
@@ -36,6 +36,18 @@
             "turbo": 1000
           }
         },
+        "labels": {
+          "type": "array",
+          "title": "labels",
+          "maxItems": 10,
+          "uniqueItems": true,
+          "items": {
+            "type": "string",
+            "minLength": 1,
+            "maxLength": 8,
+            "pattern": "^[a-zA-Z0-9]+$"
+          }
+        },
         "type": {
           "type": "string",
           "enum": [
diff --git a/src/schemas/update-proposal.json b/src/schemas/update-proposal.json
index 86a738fab..41becd41e 100644
--- a/src/schemas/update-proposal.json
+++ b/src/schemas/update-proposal.json
@@ -40,6 +40,18 @@
             "turbo": 1000
           }
         },
+        "labels": {
+          "type": "array",
+          "title": "labels",
+          "maxItems": 10,
+          "uniqueItems": true,
+          "items": {
+            "type": "string",
+            "minLength": 1,
+            "maxLength": 8,
+            "pattern": "^[a-zA-Z0-9]+$"
+          }
+        },
         "type": {
           "enum": [
             "single-choice",
diff --git a/src/sign/hashedTypes.json b/src/sign/hashedTypes.json
index 2db4449bb..039741d3b 100644
--- a/src/sign/hashedTypes.json
+++ b/src/sign/hashedTypes.json
@@ -60,5 +60,7 @@
   "42f8858a21d4aa232721cb97074851e729829ea362b88bb21f3879899663b586": "follow",
   "2bb75450e28b06f259ea764cd669de6bde0ba70ce729b0ff05ab9df56e0ff21d": "unfollow",
   "2ffbebcbd22ef48fd2f4a1182ff1feda7795b57689bd6f0dd73c89e925e7fefb": "profile",
-  "4288d50b713081aae77d60d596d75864bff7acf7791a00183401e58658ee9da5": "statement"
+  "4288d50b713081aae77d60d596d75864bff7acf7791a00183401e58658ee9da5": "statement",
+  "d56782e3b50ac86c25ae292923da8c367e3c9e8e7ea9d8baa435051fe2f430fa": "proposal",
+  "df10a7eeabe19301d6018be8b6c5d13231320d7ece64d021043fa172b64f3796": "update-proposal"
 }
diff --git a/src/sign/types.ts b/src/sign/types.ts
index bb0986919..6979d8e6c 100644
--- a/src/sign/types.ts
+++ b/src/sign/types.ts
@@ -22,6 +22,7 @@ export interface Proposal {
   body: string;
   discussion: string;
   choices: string[];
+  labels?: string[];
   start: number;
   end: number;
   snapshot: number;
@@ -39,6 +40,7 @@ export interface UpdateProposal {
   body: string;
   discussion: string;
   choices: string[];
+  labels?: string[];
   plugins: string;
 }
 
@@ -143,6 +145,7 @@ export const proposalTypes = {
     { name: 'body', type: 'string' },
     { name: 'discussion', type: 'string' },
     { name: 'choices', type: 'string[]' },
+    { name: 'labels', type: 'string[]' },
     { name: 'start', type: 'uint64' },
     { name: 'end', type: 'uint64' },
     { name: 'snapshot', type: 'uint64' },
@@ -162,6 +165,7 @@ export const updateProposalTypes = {
     { name: 'body', type: 'string' },
     { name: 'discussion', type: 'string' },
     { name: 'choices', type: 'string[]' },
+    { name: 'labels', type: 'string[]' },
     { name: 'plugins', type: 'string' }
   ]
 };
diff --git a/test/e2e/sign/index.spec.ts b/test/e2e/sign/index.spec.ts
new file mode 100644
index 000000000..2d3989d08
--- /dev/null
+++ b/test/e2e/sign/index.spec.ts
@@ -0,0 +1,32 @@
+import { describe, expect, test } from 'vitest';
+const { createHash } = require('crypto');
+import * as types from '../../../src/sign/types';
+import hashedTypes from '../../../src/sign/hashedTypes.json';
+import kebabCase from 'lodash/kebabCase';
+
+function sha256(str) {
+  return createHash('sha256').update(str).digest('hex');
+}
+describe('sign types', () => {
+  Object.keys(types).forEach((key) => {
+    test(`hashed type should contain with type ${key}`, () => {
+      const hash = sha256(JSON.stringify(types[key]));
+      expect(hash).toBeTruthy();
+      const derivedKey = kebabCase(
+        key
+          .replace('2Types', '')
+          .replace('Types', '')
+          .replace('Type', '')
+          .replace('space', 'settings')
+          .replace('cancel', 'delete')
+      );
+      try {
+        expect(hashedTypes[hash]).toBe(derivedKey);
+      } catch (error) {
+        throw new Error(
+          `Hash ${hash} does not match the derived key ${derivedKey}`
+        );
+      }
+    });
+  });
+});
diff --git a/test/examples/proposal.json b/test/examples/proposal.json
index fdc059de6..a28ad8794 100644
--- a/test/examples/proposal.json
+++ b/test/examples/proposal.json
@@ -5,6 +5,12 @@
     "Add 20,000 $YAM to Gen Exp Fund",
     "Do not add $YAM"
   ],
+  "labels": [
+    "12345678",
+    "12a4b678",
+    "abcdefgh",
+    "a1b2c3d4"
+  ],
   "start": 1619884800,
   "end": 1620316800,
   "snapshot": 12345167,