diff --git a/lib/utils/siwe-utils.js b/lib/utils/siwe-utils.js
--- a/lib/utils/siwe-utils.js
+++ b/lib/utils/siwe-utils.js
@@ -50,6 +50,11 @@
   );
 }
 
+const siweStatementWithPublicKeyRegex = /^Device IdPubKey: [a-zA-Z0-9+/]{43} By continuing, I accept the Comm Terms of Service: https:\/\/comm.app\/terms$/;
+function isValidSIWEStatementWithPublicKey(candidate: string): boolean {
+  return siweStatementWithPublicKeyRegex.test(candidate);
+}
+
 export {
   siweStatement,
   isValidSIWENonce,
@@ -57,4 +62,5 @@
   isValidPrimaryIdentityPublicKey,
   isValidSIWEMessage,
   getSIWEStatementForPublicKey,
+  isValidSIWEStatementWithPublicKey,
 };
diff --git a/lib/utils/siwe-utils.test.js b/lib/utils/siwe-utils.test.js
--- a/lib/utils/siwe-utils.test.js
+++ b/lib/utils/siwe-utils.test.js
@@ -5,6 +5,7 @@
   isValidEthereumAddress,
   isValidPrimaryIdentityPublicKey,
   isValidSIWENonce,
+  isValidSIWEStatementWithPublicKey,
 } from './siwe-utils.js';
 
 describe('SIWE Nonce utils', () => {
@@ -186,4 +187,18 @@
       getSIWEStatementForPublicKey(validPublicKey) === expectedString,
     ).toBe(true);
   });
+
+  it(`isValidSIWEStatementWithPublicKey should be true for well formed SIWE statement`, () => {
+    const validPublicKey = 'rPFzRtV7E6v1b60zjTvghqb2xgnggmn6j4UaYccJYdo';
+    const expectedString =
+      `Device IdPubKey: rPFzRtV7E6v1b60zjTvghqb2xgnggmn6j4UaYccJYdo ` +
+      `By continuing, I accept the Comm Terms of Service: https://comm.app/terms`;
+
+    expect(isValidSIWEStatementWithPublicKey(expectedString)).toBe(true);
+    expect(
+      isValidSIWEStatementWithPublicKey(
+        getSIWEStatementForPublicKey(validPublicKey),
+      ),
+    ).toBe(true);
+  });
 });