diff --git a/keyserver/src/responders/user-responders.js b/keyserver/src/responders/user-responders.js
--- a/keyserver/src/responders/user-responders.js
+++ b/keyserver/src/responders/user-responders.js
@@ -193,6 +193,11 @@
   deviceToken: t.String,
 });
 
+const signedIdentityKeysBlobValidator = tShape({
+  payload: t.String,
+  signature: t.String,
+});
+
 const registerRequestInputValidator = tShape({
   username: t.String,
   email: t.maybe(tEmail),
@@ -203,6 +208,7 @@
   // We include `primaryIdentityPublicKey` to avoid breaking
   // old clients, but we no longer do anything with it.
   primaryIdentityPublicKey: t.maybe(tRegex(primaryIdentityPublicKeyRegex)),
+  signedIdentityKeysBlob: t.maybe(signedIdentityKeysBlobValidator),
 });
 
 async function accountCreationResponder(
@@ -317,11 +323,6 @@
   return response;
 }
 
-const signedIdentityKeysBlobValidator = tShape({
-  payload: t.String,
-  signature: t.String,
-});
-
 const logInRequestInputValidator = tShape({
   username: t.maybe(t.String),
   usernameOrEmail: t.maybe(t.union([tEmail, tOldValidUsername])),
diff --git a/lib/types/account-types.js b/lib/types/account-types.js
--- a/lib/types/account-types.js
+++ b/lib/types/account-types.js
@@ -40,7 +40,6 @@
   ...LogInExtraInfo,
   +username: string,
   +password: string,
-  +primaryIdentityPublicKey?: string,
 };
 
 type DeviceTokenUpdateRequest = {
@@ -103,7 +102,6 @@
 export type LogInExtraInfo = {
   +calendarQuery: CalendarQuery,
   +deviceTokenUpdateRequest?: ?DeviceTokenUpdateRequest,
-  +primaryIdentityPublicKey?: string,
   +signedIdentityKeysBlob?: SignedIdentityKeysBlob,
 };
 
diff --git a/native/account/siwe-panel.react.js b/native/account/siwe-panel.react.js
--- a/native/account/siwe-panel.react.js
+++ b/native/account/siwe-panel.react.js
@@ -139,8 +139,7 @@
 
   const handleSIWE = React.useCallback(
     async ({ message, signature }) => {
-      const { primaryIdentityPublicKey: publicKey, ...extraInfo } =
-        await logInExtraInfo();
+      const extraInfo = await logInExtraInfo();
 
       dispatchActionPromise(
         siweAuthActionTypes,
diff --git a/native/selectors/account-selectors.js b/native/selectors/account-selectors.js
--- a/native/selectors/account-selectors.js
+++ b/native/selectors/account-selectors.js
@@ -4,6 +4,7 @@
 
 import { logInExtraInfoSelector } from 'lib/selectors/account-selectors.js';
 import type { LogInExtraInfo } from 'lib/types/account-types.js';
+import type { SignedIdentityKeysBlob } from 'lib/types/crypto-types.js';
 import type { UserPolicies } from 'lib/types/policy-types.js';
 import { values } from 'lib/utils/objects.js';
 
@@ -24,12 +25,15 @@
   ) => {
     const loginExtraFuncWithIdentityKey = async () => {
       await commCoreModule.initializeCryptoAccount();
-      const {
-        primaryIdentityPublicKeys: { ed25519 },
-      } = await commCoreModule.getUserPublicKey();
+      const { blobPayload, signature } =
+        await commCoreModule.getUserPublicKey();
+      const signedIdentityKeysBlob: SignedIdentityKeysBlob = {
+        payload: blobPayload,
+        signature,
+      };
       return {
         ...logInExtraInfoFunc(calendarActive),
-        primaryIdentityPublicKey: ed25519,
+        signedIdentityKeysBlob,
       };
     };
     return loginExtraFuncWithIdentityKey;
diff --git a/web/account/traditional-login-form.react.js b/web/account/traditional-login-form.react.js
--- a/web/account/traditional-login-form.react.js
+++ b/web/account/traditional-login-form.react.js
@@ -109,7 +109,6 @@
           username,
           password,
           logInActionSource: logInActionSources.logInFromWebForm,
-          primaryIdentityPublicKey: primaryIdentityPublicKeys.ed25519,
           signedIdentityKeysBlob,
         });
         modalContext.popModal();