diff --git a/native/account/registration/registration-context-provider.react.js b/native/account/registration/registration-context-provider.react.js
--- a/native/account/registration/registration-context-provider.react.js
+++ b/native/account/registration/registration-context-provider.react.js
@@ -2,9 +2,14 @@
 
 import * as React from 'react';
 
+import { isLoggedIn } from 'lib/selectors/user-selectors.js';
+
 import { RegistrationContext } from './registration-context.js';
 import { useRegistrationServerCall } from './registration-server-call.js';
 import type { CachedUserSelections } from './registration-types.js';
+import { commCoreModule } from '../../native-modules.js';
+import { useSelector } from '../../redux/redux-utils.js';
+import Alert from '../../utils/alert.js';
 
 const emptyObj: CachedUserSelections = Object.freeze({});
 
@@ -38,6 +43,48 @@
     ],
   );
 
+  const loggedIn = useSelector(isLoggedIn);
+  const persistSIWEBackupSecretsPromise = React.useRef<?Promise<void>>(null);
+
+  React.useEffect(() => {
+    if (persistSIWEBackupSecretsPromise.current) {
+      return;
+    }
+    const innerSiweBackupSecrets = cachedSelections.siweBackupSecrets;
+    if (!innerSiweBackupSecrets || !loggedIn) {
+      return;
+    }
+
+    persistSIWEBackupSecretsPromise.current = void (async () => {
+      try {
+        await commCoreModule.setSIWEBackupSecrets(innerSiweBackupSecrets);
+      } catch (e) {
+        console.log(e);
+        if (__DEV__) {
+          Alert.alert(
+            'Failed to persist SIWE backup secrets to SQLite.',
+            e.message,
+          );
+        }
+      } finally {
+        setCachedSelections(oldUserSelections => ({
+          ...oldUserSelections,
+          siweBackupSecrets: undefined,
+        }));
+        persistSIWEBackupSecretsPromise.current = null;
+      }
+    })();
+  }, [cachedSelections.siweBackupSecrets, loggedIn]);
+
+  React.useEffect(() => {
+    if (!loggedIn) {
+      setCachedSelections(oldUserSelections => ({
+        ...oldUserSelections,
+        siweBackupSecrets: undefined,
+      }));
+    }
+  }, [loggedIn]);
+
   return (
     <RegistrationContext.Provider value={contextValue}>
       {props.children}
diff --git a/native/account/registration/registration-types.js b/native/account/registration/registration-types.js
--- a/native/account/registration/registration-types.js
+++ b/native/account/registration/registration-types.js
@@ -5,7 +5,7 @@
   ClientAvatar,
 } from 'lib/types/avatar-types.js';
 import type { NativeMediaSelection } from 'lib/types/media-types.js';
-import type { SIWEResult } from 'lib/types/siwe-types.js';
+import type { SIWEResult, SIWEBackupSecrets } from 'lib/types/siwe-types.js';
 
 export type CoolOrNerdMode = 'cool' | 'nerd';
 
@@ -53,6 +53,7 @@
   +avatarData?: ?AvatarData,
   +ethereumAccount?: EthereumAccountSelection,
   +farcasterID?: string,
+  +siweBackupSecrets?: ?SIWEBackupSecrets,
 };
 
 export const ensAvatarSelection: AvatarData = {
diff --git a/native/account/registration/siwe-backup-message-creation.react.js b/native/account/registration/siwe-backup-message-creation.react.js
--- a/native/account/registration/siwe-backup-message-creation.react.js
+++ b/native/account/registration/siwe-backup-message-creation.react.js
@@ -1,5 +1,6 @@
 // @flow
 
+import invariant from 'invariant';
 import * as React from 'react';
 import { Text } from 'react-native';
 
@@ -9,6 +10,7 @@
 import RegistrationButton from './registration-button.react.js';
 import RegistrationContainer from './registration-container.react.js';
 import RegistrationContentContainer from './registration-content-container.react.js';
+import { RegistrationContext } from './registration-context.js';
 import { type RegistrationNavigationProp } from './registration-navigator.react.js';
 import type {
   CoolOrNerdMode,
@@ -68,15 +70,23 @@
     [panelState],
   );
 
+  const registrationContext = React.useContext(RegistrationContext);
+  invariant(registrationContext, 'registrationContext should be set');
+  const { setCachedSelections } = registrationContext;
+
   const onSuccessfulWalletSignature = React.useCallback(
     (result: SIWEResult) => {
-      console.log(result);
+      const { message, signature } = result;
+      setCachedSelections(oldUserSelections => ({
+        ...oldUserSelections,
+        siweBackupSecrets: { message, signature },
+      }));
       navigate<'RegistrationTerms'>({
         name: RegistrationTermsRouteName,
         params,
       });
     },
-    [navigate, params],
+    [navigate, params, setCachedSelections],
   );
 
   let siwePanel;