diff --git a/lib/selectors/socket-selectors.js b/lib/selectors/socket-selectors.js
--- a/lib/selectors/socket-selectors.js
+++ b/lib/selectors/socket-selectors.js
@@ -9,6 +9,7 @@
   filterRawEntryInfosByCalendarQuery,
 } from '../shared/entry-utils.js';
 import threadWatcher from '../shared/thread-watcher.js';
+import type { SignedIdentityKeysBlob } from '../types/crypto-types.js';
 import type { RawEntryInfo, CalendarQuery } from '../types/entry-types.js';
 import type { AppState } from '../types/redux-types.js';
 import type { ClientReportCreationRequest } from '../types/report-types.js';
@@ -39,6 +40,7 @@
 ) => (
   calendarActive: boolean,
   oneTimeKeyGenerator: ?OneTimeKeyGenerator,
+  getSignedIdentityKeysBlob: ?() => SignedIdentityKeysBlob,
   serverRequests: $ReadOnlyArray<ClientServerRequest>,
 ) => $ReadOnlyArray<ClientClientResponse> = createSelector(
   (state: AppState) => state.threadStore.threadInfos,
@@ -56,6 +58,7 @@
     (
       calendarActive: boolean,
       oneTimeKeyGenerator: ?OneTimeKeyGenerator,
+      getSignedIdentityKeysBlob: ?() => SignedIdentityKeysBlob,
       serverRequests: $ReadOnlyArray<ClientServerRequest>,
     ): $ReadOnlyArray<ClientClientResponse> => {
       const clientResponses = [];
@@ -157,6 +160,15 @@
             type: serverRequestTypes.MORE_ONE_TIME_KEYS,
             keys,
           });
+        } else if (
+          serverRequest.type === serverRequestTypes.SIGNED_IDENTITY_KEYS_BLOB &&
+          getSignedIdentityKeysBlob
+        ) {
+          const signedIdentityKeysBlob = getSignedIdentityKeysBlob();
+          clientResponses.push({
+            type: serverRequestTypes.SIGNED_IDENTITY_KEYS_BLOB,
+            signedIdentityKeysBlob,
+          });
         }
       }
       return clientResponses;
diff --git a/native/selectors/socket-selectors.js b/native/selectors/socket-selectors.js
--- a/native/selectors/socket-selectors.js
+++ b/native/selectors/socket-selectors.js
@@ -7,6 +7,7 @@
   sessionStateFuncSelector,
 } from 'lib/selectors/socket-selectors.js';
 import { createOpenSocketFunction } from 'lib/shared/socket-utils.js';
+import type { SignedIdentityKeysBlob } from 'lib/types/crypto-types.js';
 import type {
   ClientServerRequest,
   ClientClientResponse,
@@ -61,6 +62,7 @@
       getClientResponsesFunc: (
         calendarActive: boolean,
         oneTimeKeyGenerator: ?OneTimeKeyGenerator,
+        getSignedIdentityKeysBlob: ?() => SignedIdentityKeysBlob,
         serverRequests: $ReadOnlyArray<ClientServerRequest>,
       ) => $ReadOnlyArray<ClientClientResponse>,
       calendarActive: boolean,
@@ -69,6 +71,7 @@
       getClientResponsesFunc(
         calendarActive,
         oneTimeKeyGenerator,
+        null,
         serverRequests,
       ),
 );
diff --git a/web/selectors/socket-selectors.js b/web/selectors/socket-selectors.js
--- a/web/selectors/socket-selectors.js
+++ b/web/selectors/socket-selectors.js
@@ -7,6 +7,7 @@
   sessionStateFuncSelector,
 } from 'lib/selectors/socket-selectors.js';
 import { createOpenSocketFunction } from 'lib/shared/socket-utils.js';
+import type { SignedIdentityKeysBlob } from 'lib/types/crypto-types.js';
 import type {
   ClientServerRequest,
   ClientClientResponse,
@@ -42,12 +43,13 @@
       getClientResponsesFunc: (
         calendarActive: boolean,
         oneTimeKeyGenerator: ?OneTimeKeyGenerator,
+        getSignedIdentityKeysBlob: ?() => SignedIdentityKeysBlob,
         serverRequests: $ReadOnlyArray<ClientServerRequest>,
       ) => $ReadOnlyArray<ClientClientResponse>,
       calendarActive: boolean,
     ) =>
     (serverRequests: $ReadOnlyArray<ClientServerRequest>) =>
-      getClientResponsesFunc(calendarActive, null, serverRequests),
+      getClientResponsesFunc(calendarActive, null, null, serverRequests),
 );
 
 const webSessionStateFuncSelector: (state: AppState) => () => SessionState =