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
@@ -1,5 +1,7 @@
 // @flow
 
+import invariant from 'invariant';
+
 import type { SIWEMessage } from '../types/siwe-types.js';
 import { isDev } from './dev-utils.js';
 
@@ -37,10 +39,19 @@
   );
 }
 
+function getSIWEStatementForPublicKey(publicKey: string): string {
+  invariant(
+    isValidPrimaryIdentityPublicKey(publicKey),
+    'publicKey must be well formed in getSIWEStatementForPublicKey',
+  );
+  return `Device IdPubKey: ${publicKey} ${siweStatement}`;
+}
+
 export {
   siweStatement,
   isValidSIWENonce,
   isValidEthereumAddress,
   isValidPrimaryIdentityPublicKey,
   isValidSIWEMessage,
+  getSIWEStatementForPublicKey,
 };
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
@@ -1,6 +1,7 @@
 // @flow
 
 import {
+  getSIWEStatementForPublicKey,
   isValidEthereumAddress,
   isValidPrimaryIdentityPublicKey,
   isValidSIWENonce,
@@ -175,4 +176,14 @@
     const longPublicKey = '98+/eB2MUVvYCpkESOSWttsYWDKeDXl8TAAAAAAAAAA3o8LY';
     expect(isValidPrimaryIdentityPublicKey(longPublicKey)).toBe(false);
   });
+
+  it(`getSIWEStatementForPublicKey should generate expected statement`, () => {
+    const validPublicKey = 'rPFzRtV7E6v1b60zjTvghqb2xgnggmn6j4UaYccJYdo';
+    const expectedString =
+      `Device IdPubKey: rPFzRtV7E6v1b60zjTvghqb2xgnggmn6j4UaYccJYdo ` +
+      `By continuing, I accept the Comm Terms of Service: https://comm.app/terms`;
+    expect(
+      getSIWEStatementForPublicKey(validPublicKey) === expectedString,
+    ).toBe(true);
+  });
 });