diff --git a/landing/siwe.react.js b/landing/siwe.react.js
index 4c69935ce..833b6fea5 100644
--- a/landing/siwe.react.js
+++ b/landing/siwe.react.js
@@ -1,99 +1,115 @@
 // @flow
 
 import {
   ConnectButton,
   getDefaultWallets,
   RainbowKitProvider,
 } from '@rainbow-me/rainbowkit';
+import invariant from 'invariant';
 import * as React from 'react';
 import { SiweMessage } from 'siwe';
 import '@rainbow-me/rainbowkit/dist/index.css';
 import {
   useAccount,
   useSigner,
   chain,
   configureChains,
   createClient,
   WagmiConfig,
 } from 'wagmi';
 import { publicProvider } from 'wagmi/providers/public';
 
+import { SIWENonceContext } from './siwe-nonce-context.js';
 import css from './siwe.css';
 
 // details can be found https://wagmi.sh/docs/providers/configuring-chains
 const { chains, provider } = configureChains(
   [chain.mainnet],
   [publicProvider()],
 );
 
 const { connectors } = getDefaultWallets({
   appName: 'comm',
   chains,
 });
 
 const wagmiClient = createClient({
   autoConnect: true,
   connectors,
   provider,
 });
 
-function createSiweMessage(address, statement) {
+function createSiweMessage(address: string, statement: string, nonce: string) {
+  invariant(nonce, 'nonce must be present in createSiweMessage');
   const domain = window.location.host;
   const origin = window.location.origin;
   const message = new SiweMessage({
     domain,
     address,
     statement,
     uri: origin,
     version: '1',
     chainId: '1',
+    nonce,
   });
   return message.prepareMessage();
 }
 
-async function signInWithEthereum(address, signer) {
+async function signInWithEthereum(address: string, signer, nonce: string) {
+  invariant(nonce, 'nonce must be present in signInWithEthereum');
   const message = createSiweMessage(
     address,
     'By continuing, I accept the Comm Terms of Service: https://comm.app/terms',
+    nonce,
   );
   const signature = await signer.signMessage(message);
   const messageToPost = JSON.stringify({ address, message, signature });
   window.ReactNativeWebView?.postMessage?.(messageToPost);
   return signature;
 }
 
 function SIWE(): React.Node {
   const { address } = useAccount();
   const { data: signer } = useSigner();
-  const onClick = React.useCallback(() => signInWithEthereum(address, signer), [
-    address,
-    signer,
-  ]);
+  const { siweNonce } = React.useContext(SIWENonceContext);
+  const onClick = React.useCallback(() => {
+    invariant(siweNonce, 'nonce must be present during SIWE attempt');
+    signInWithEthereum(address, signer, siweNonce);
+  }, [address, signer, siweNonce]);
+
+  if (siweNonce === null || siweNonce === undefined) {
+    return (
+      <div className={css.wrapper}>
+        <h1 className={css.h1}>Unable to proceed: nonce not found.</h1>
+      </div>
+    );
+  }
+
   const SignInButton = !signer ? null : (
     <div className={css.button} onClick={onClick}>
       <img src="images/ethereum_icon.svg" style={ethIconStyle} />
       sign in
     </div>
   );
   return (
     <div className={css.wrapper}>
       <h1 className={css.h1}>SIWE</h1>
       <ConnectButton />
       <div className={css.spacer} />
       {SignInButton}
     </div>
   );
 }
 function SIWEWrapper(): React.Node {
   return (
     <WagmiConfig client={wagmiClient}>
       <RainbowKitProvider chains={chains}>
         <SIWE />
       </RainbowKitProvider>
     </WagmiConfig>
   );
 }
 
 const ethIconStyle = { height: 25, paddingRight: 10 };
 
 export default SIWEWrapper;