diff --git a/keyserver/src/keyserver.js b/keyserver/src/keyserver.js
--- a/keyserver/src/keyserver.js
+++ b/keyserver/src/keyserver.js
@@ -30,6 +30,7 @@
   multimediaUploadResponder,
   uploadDownloadResponder,
 } from './uploads/uploads.js';
+import { verifyUserLogin } from './user/login.js';
 import { initENSCache } from './utils/ens-cache.js';
 import {
   prefetchAllURLFacts,
@@ -63,6 +64,13 @@
       cluster.fork();
     }
     cluster.on('exit', () => cluster.fork());
+
+    // Allow login to be optional until staging environment is available
+    try {
+      await verifyUserLogin();
+    } catch (e) {
+      console.log('Failed to log into identity service');
+    }
   } else {
     const server = express();
     expressWs(server);
diff --git a/keyserver/src/user/login.js b/keyserver/src/user/login.js
new file mode 100644
--- /dev/null
+++ b/keyserver/src/user/login.js
@@ -0,0 +1,196 @@
+// @flow
+
+import type { Account as OlmAccount } from '@commapp/olm';
+import type { QueryResults } from 'mysql';
+import { getRustAPI } from 'rust-node-addon';
+
+import type { OLMOneTimeKeys } from 'lib/types/crypto-types';
+import { getCommConfig } from 'lib/utils/comm-config.js';
+import { ServerError } from 'lib/utils/errors.js';
+
+import { SQL, dbQuery } from '../database/database.js';
+import { fetchCallUpdateOlmAccount } from '../updaters/olm-account-updater.js';
+import { validateAccountPrekey } from '../utils/olm-utils.js';
+
+type UserCredentials = { +username: string, +password: string };
+type IdentityInfo = { +userId: string, +accessToken: string };
+
+const userIDMetadataKey = 'user_id';
+const accessTokenMetadataKey = 'access_token';
+
+export type AccountKeysSet = {
+  +identityKeys: string,
+  +prekey: string,
+  +prekeySignature: string,
+  +oneTimeKey: $ReadOnlyArray<string>,
+};
+
+function getOneTimeKeyValues(keyBlob: string): $ReadOnlyArray<string> {
+  const content: OLMOneTimeKeys = JSON.parse(keyBlob);
+  const keys: $ReadOnlyArray<string> = Object.values(content.curve25519);
+  return keys;
+}
+
+async function retrieveAccountKeysSet(
+  account: OlmAccount,
+): Promise<AccountKeysSet> {
+  const identityKeys = account.identity_keys();
+
+  validateAccountPrekey(account);
+  const prekeyMap = JSON.parse(account.prekey()).curve25519;
+  let prekey = null;
+  for (const key in prekeyMap) {
+    prekey = prekeyMap[key];
+  }
+  const prekeySignature = account.prekey_signature();
+
+  if (!prekeySignature || !prekey) {
+    throw new ServerError('Invalid prekey or signature');
+  }
+
+  if (getOneTimeKeyValues(account.one_time_keys()).length < 10) {
+    account.generate_one_time_keys(10);
+  }
+
+  const oneTimeKey = getOneTimeKeyValues(account.one_time_keys());
+
+  return { identityKeys, oneTimeKey, prekey, prekeySignature };
+}
+
+// After register or login is successful
+async function markKeysAsPublished(account: OlmAccount) {
+  account.mark_prekey_as_published();
+  account.mark_keys_as_published();
+}
+
+async function fetchIdentityInfo(): Promise<?IdentityInfo> {
+  const versionQuery = SQL`
+    SELECT data
+    FROM metadata
+    WHERE name IN (${userIDMetadataKey}, ${accessTokenMetadataKey});
+  `;
+
+  const [[userId, accessToken]] = await dbQuery(versionQuery);
+  if (!userId || !accessToken) {
+    return null;
+  }
+  return { userId, accessToken };
+}
+
+async function saveIdentityInfo(userInfo: IdentityInfo): Promise<QueryResults> {
+  const updateQuery = SQL`
+    REPLACE INTO metadata (name, data)
+    VALUES (${userIDMetadataKey}, ${userInfo.userId}),
+      (${accessTokenMetadataKey}, ${userInfo.accessToken})
+  `;
+
+  return dbQuery(updateQuery);
+}
+
+async function verifyUserLogin(): Promise<IdentityInfo> {
+  const result = await fetchIdentityInfo();
+
+  if (!result) {
+    const identityInfo = await registerOrLogin();
+    await saveIdentityInfo(identityInfo);
+    return identityInfo;
+  }
+
+  return result;
+}
+
+async function registerOrLogin(): Promise<IdentityInfo> {
+  const rustAPIPromise = getRustAPI();
+
+  const userInfo = await getCommConfig<UserCredentials>({
+    folder: 'secrets',
+    name: 'user_credentials',
+  });
+
+  if (!userInfo) {
+    throw new ServerError('Missing user credentials');
+  }
+
+  const {
+    identityKeys: notificationsIdentityKeys,
+    prekey: notificationsPrekey,
+    prekeySignature: notificationsPrekeySignature,
+    oneTimeKey: notificationsOneTimeKey,
+  } = await fetchCallUpdateOlmAccount('notifications', retrieveAccountKeysSet);
+
+  const contentAccountCallback = async (account: OlmAccount) => {
+    const {
+      identityKeys: contentIdentityKeys,
+      oneTimeKey,
+      prekey,
+      prekeySignature,
+    } = await retrieveAccountKeysSet(account);
+
+    const identityKeysBlob = {
+      primaryIdentityPublicKeys: JSON.parse(contentIdentityKeys),
+      notificationIdentityPublicKeys: JSON.parse(notificationsIdentityKeys),
+    };
+    const identityKeysBlobPayload = JSON.stringify(identityKeysBlob);
+    const signedIdentityKeysBlob = {
+      payload: identityKeysBlobPayload,
+      signature: account.sign(identityKeysBlobPayload),
+    };
+
+    return {
+      signedIdentityKeysBlob,
+      oneTimeKey,
+      prekey,
+      prekeySignature,
+    };
+  };
+
+  const {
+    signedIdentityKeysBlob,
+    prekey: contentPrekey,
+    prekeySignature: contentPrekeySignature,
+    oneTimeKey: contentOneTimeKey,
+  } = await fetchCallUpdateOlmAccount('content', contentAccountCallback);
+
+  const rustAPI = await rustAPIPromise;
+
+  try {
+    const identity_info = await rustAPI.loginUser(
+      userInfo.username,
+      userInfo.password,
+      signedIdentityKeysBlob,
+      contentPrekey,
+      contentPrekeySignature,
+      notificationsPrekey,
+      notificationsPrekeySignature,
+      contentOneTimeKey,
+      notificationsOneTimeKey,
+    );
+    fetchCallUpdateOlmAccount('content', markKeysAsPublished);
+    fetchCallUpdateOlmAccount('notifications', markKeysAsPublished);
+    return identity_info;
+  } catch (e) {
+    console.log('Failed to log into identity service: ' + e);
+    try {
+      const identity_info = await rustAPI.registerUser(
+        userInfo.username,
+        userInfo.password,
+        signedIdentityKeysBlob,
+        contentPrekey,
+        contentPrekeySignature,
+        notificationsPrekey,
+        notificationsPrekeySignature,
+        contentOneTimeKey,
+        notificationsOneTimeKey,
+      );
+      console.log('Finished registration');
+      fetchCallUpdateOlmAccount('content', markKeysAsPublished);
+      fetchCallUpdateOlmAccount('notifications', markKeysAsPublished);
+      return identity_info;
+    } catch (err) {
+      console.log('Failed to register user: ' + err);
+      throw new Error('Unable to login or register user');
+    }
+  }
+}
+
+export { verifyUserLogin };