diff --git a/lib/types/identity-service-types.js b/lib/types/identity-service-types.js
index 2f2d55175..61cf9372e 100644
--- a/lib/types/identity-service-types.js
+++ b/lib/types/identity-service-types.js
@@ -1,246 +1,255 @@
 // @flow
 
-import t, { type TInterface, type TList } from 'tcomb';
+import t, { type TInterface, type TList, type TDict } from 'tcomb';
 
 import {
   identityKeysBlobValidator,
   type IdentityKeysBlob,
   signedPrekeysValidator,
   type SignedPrekeys,
   type OneTimeKeysResultValues,
 } from './crypto-types.js';
 import {
   type OlmSessionInitializationInfo,
   olmSessionInitializationInfoValidator,
 } from './request-types.js';
 import {
   currentUserInfoValidator,
   type CurrentUserInfo,
 } from './user-types.js';
 import { tShape } from '../utils/validation-utils.js';
 
 export type UserAuthMetadata = {
   +userID: string,
   +accessToken: string,
 };
 
 // This type should not be altered without also updating OutboundKeyInfoResponse
 // in native/native_rust_library/src/identity/x3dh.rs
 export type OutboundKeyInfoResponse = {
   +payload: string,
   +payloadSignature: string,
   +contentPrekey: string,
   +contentPrekeySignature: string,
   +notifPrekey: string,
   +notifPrekeySignature: string,
   +oneTimeContentPrekey: ?string,
   +oneTimeNotifPrekey: ?string,
 };
 
 // This type should not be altered without also updating InboundKeyInfoResponse
 // in native/native_rust_library/src/identity/x3dh.rs
 export type InboundKeyInfoResponse = {
   +payload: string,
   +payloadSignature: string,
   +contentPrekey: string,
   +contentPrekeySignature: string,
   +notifPrekey: string,
   +notifPrekeySignature: string,
   +username?: ?string,
   +walletAddress?: ?string,
 };
 
 export type DeviceOlmOutboundKeys = {
   +identityKeysBlob: IdentityKeysBlob,
   +contentInitializationInfo: OlmSessionInitializationInfo,
   +notifInitializationInfo: OlmSessionInitializationInfo,
   +payloadSignature: string,
 };
 export const deviceOlmOutboundKeysValidator: TInterface<DeviceOlmOutboundKeys> =
   tShape<DeviceOlmOutboundKeys>({
     identityKeysBlob: identityKeysBlobValidator,
     contentInitializationInfo: olmSessionInitializationInfoValidator,
     notifInitializationInfo: olmSessionInitializationInfoValidator,
     payloadSignature: t.String,
   });
 
 export type UserDevicesOlmOutboundKeys = {
   +deviceID: string,
   +keys: ?DeviceOlmOutboundKeys,
 };
 
 export type DeviceOlmInboundKeys = {
   +identityKeysBlob: IdentityKeysBlob,
   +signedPrekeys: SignedPrekeys,
   +payloadSignature: string,
 };
 export const deviceOlmInboundKeysValidator: TInterface<DeviceOlmInboundKeys> =
   tShape<DeviceOlmInboundKeys>({
     identityKeysBlob: identityKeysBlobValidator,
     signedPrekeys: signedPrekeysValidator,
     payloadSignature: t.String,
   });
 
 export type UserDevicesOlmInboundKeys = {
   +keys: {
     +[deviceID: string]: ?DeviceOlmInboundKeys,
   },
   +username?: ?string,
   +walletAddress?: ?string,
 };
 
 // This type should not be altered without also updating FarcasterUser in
 // keyserver/addons/rust-node-addon/src/identity_client/get_farcaster_users.rs
 export type FarcasterUser = {
   +userID: string,
   +username: string,
   +farcasterID: string,
 };
 
 export const farcasterUserValidator: TInterface<FarcasterUser> =
   tShape<FarcasterUser>({
     userID: t.String,
     username: t.String,
     farcasterID: t.String,
   });
 
 export const farcasterUsersValidator: TList<Array<FarcasterUser>> = t.list(
   farcasterUserValidator,
 );
 
 export const userDeviceOlmInboundKeysValidator: TInterface<UserDevicesOlmInboundKeys> =
   tShape<UserDevicesOlmInboundKeys>({
     keys: t.dict(t.String, t.maybe(deviceOlmInboundKeysValidator)),
     username: t.maybe(t.String),
     walletAddress: t.maybe(t.String),
   });
 
 export interface IdentityServiceClient {
   // Only a primary device can initiate account deletion, and web cannot be a
   // primary device
   +deleteWalletUser?: () => Promise<void>;
   // Only a primary device can initiate account deletion, and web cannot be a
   // primary device
   +deletePasswordUser?: (password: string) => Promise<void>;
   +logOut: () => Promise<void>;
   +getKeyserverKeys: string => Promise<DeviceOlmOutboundKeys>;
   +registerPasswordUser?: (
     username: string,
     password: string,
   ) => Promise<IdentityAuthResult>;
   +logInPasswordUser: (
     username: string,
     password: string,
   ) => Promise<IdentityAuthResult>;
   +getOutboundKeysForUser: (
     userID: string,
   ) => Promise<UserDevicesOlmOutboundKeys[]>;
   +getInboundKeysForUser: (
     userID: string,
   ) => Promise<UserDevicesOlmInboundKeys>;
   +uploadOneTimeKeys: (oneTimeKeys: OneTimeKeysResultValues) => Promise<void>;
   +generateNonce: () => Promise<string>;
   +registerWalletUser?: (
     walletAddress: string,
     siweMessage: string,
     siweSignature: string,
   ) => Promise<IdentityAuthResult>;
   +logInWalletUser: (
     walletAddress: string,
     siweMessage: string,
     siweSignature: string,
   ) => Promise<IdentityAuthResult>;
   // on native, publishing prekeys to Identity is called directly from C++,
   // there is no need to expose it to JS
   +publishWebPrekeys?: (prekeys: SignedPrekeys) => Promise<void>;
   +getDeviceListHistoryForUser: (
     userID: string,
     sinceTimestamp?: number,
   ) => Promise<$ReadOnlyArray<SignedDeviceList>>;
+  +getDeviceListsForUsers?: (
+    userIDs: $ReadOnlyArray<string>,
+  ) => Promise<UsersSignedDeviceLists>;
   // updating device list is possible only on Native
   // web cannot be a primary device, so there's no need to expose it to JS
   +updateDeviceList?: (newDeviceList: SignedDeviceList) => Promise<void>;
   +uploadKeysForRegisteredDeviceAndLogIn: (
     userID: string,
     signedNonce: SignedNonce,
   ) => Promise<IdentityAuthResult>;
   +getFarcasterUsers: (
     farcasterIDs: $ReadOnlyArray<string>,
   ) => Promise<$ReadOnlyArray<FarcasterUser>>;
   +linkFarcasterAccount: (farcasterID: string) => Promise<void>;
   +unlinkFarcasterAccount: () => Promise<void>;
 }
 
 export type IdentityServiceAuthLayer = {
   +userID: string,
   +deviceID: string,
   +commServicesAccessToken: string,
 };
 
 export type IdentityAuthResult = {
   +userID: string,
   +accessToken: string,
   +username: string,
   +preRequestUserState?: ?CurrentUserInfo,
 };
 export const identityAuthResultValidator: TInterface<IdentityAuthResult> =
   tShape<IdentityAuthResult>({
     userID: t.String,
     accessToken: t.String,
     username: t.String,
     preRequestUserState: t.maybe(currentUserInfoValidator),
   });
 
 export type IdentityNewDeviceKeyUpload = {
   +keyPayload: string,
   +keyPayloadSignature: string,
   +contentPrekey: string,
   +contentPrekeySignature: string,
   +notifPrekey: string,
   +notifPrekeySignature: string,
   +contentOneTimeKeys: $ReadOnlyArray<string>,
   +notifOneTimeKeys: $ReadOnlyArray<string>,
 };
 
 export type IdentityExistingDeviceKeyUpload = {
   +keyPayload: string,
   +keyPayloadSignature: string,
   +contentPrekey: string,
   +contentPrekeySignature: string,
   +notifPrekey: string,
   +notifPrekeySignature: string,
 };
 
 // Device list types
 
 export type RawDeviceList = {
   +devices: $ReadOnlyArray<string>,
   +timestamp: number,
 };
 
 export type SignedDeviceList = {
   // JSON-stringified RawDeviceList
   +rawDeviceList: string,
 };
 export const signedDeviceListValidator: TInterface<SignedDeviceList> =
   tShape<SignedDeviceList>({
     rawDeviceList: t.String,
   });
 export const signedDeviceListHistoryValidator: TList<Array<SignedDeviceList>> =
   t.list(signedDeviceListValidator);
 
+export type UsersSignedDeviceLists = {
+  +[userID: string]: SignedDeviceList,
+};
+export const usersSignedDeviceListsValidator: TDict<UsersSignedDeviceLists> =
+  t.dict(t.String, signedDeviceListValidator);
+
 export type SignedNonce = {
   +nonce: string,
   +nonceSignature: string,
 };
 
 export const ONE_TIME_KEYS_NUMBER = 10;
 
 export const identityDeviceTypes = Object.freeze({
   KEYSERVER: 0,
   WEB: 1,
   IOS: 2,
   ANDROID: 3,
   WINDOWS: 4,
   MAC_OS: 5,
 });
diff --git a/native/identity-service/identity-service-context-provider.react.js b/native/identity-service/identity-service-context-provider.react.js
index b0540d5a8..d65f57892 100644
--- a/native/identity-service/identity-service-context-provider.react.js
+++ b/native/identity-service/identity-service-context-provider.react.js
@@ -1,608 +1,637 @@
 // @flow
 
 import * as React from 'react';
 
 import { getOneTimeKeyValues } from 'lib/shared/crypto-utils.js';
 import { IdentityClientContext } from 'lib/shared/identity-client-context.js';
 import {
   type IdentityKeysBlob,
   identityKeysBlobValidator,
   type OneTimeKeysResultValues,
 } from 'lib/types/crypto-types.js';
 import {
-  type SignedDeviceList,
-  signedDeviceListHistoryValidator,
-  type SignedNonce,
+  type DeviceOlmInboundKeys,
+  deviceOlmInboundKeysValidator,
   type DeviceOlmOutboundKeys,
   deviceOlmOutboundKeysValidator,
+  farcasterUsersValidator,
+  identityAuthResultValidator,
   type IdentityServiceClient,
-  type UserDevicesOlmOutboundKeys,
-  type UserAuthMetadata,
   ONE_TIME_KEYS_NUMBER,
-  identityAuthResultValidator,
-  type DeviceOlmInboundKeys,
-  type UserDevicesOlmInboundKeys,
-  deviceOlmInboundKeysValidator,
+  type SignedDeviceList,
+  signedDeviceListHistoryValidator,
+  type SignedNonce,
+  type UserAuthMetadata,
   userDeviceOlmInboundKeysValidator,
-  farcasterUsersValidator,
+  type UserDevicesOlmInboundKeys,
+  type UserDevicesOlmOutboundKeys,
+  type UsersSignedDeviceLists,
+  usersSignedDeviceListsValidator,
 } from 'lib/types/identity-service-types.js';
 import { getContentSigningKey } from 'lib/utils/crypto-utils.js';
 import { assertWithValidator } from 'lib/utils/validation-utils.js';
 
 import { getCommServicesAuthMetadataEmitter } from '../event-emitters/csa-auth-metadata-emitter.js';
 import { commCoreModule, commRustModule } from '../native-modules.js';
 import { useSelector } from '../redux/redux-utils.js';
 
 type Props = {
   +children: React.Node,
 };
 function IdentityServiceContextProvider(props: Props): React.Node {
   const { children } = props;
 
   const userIDPromiseRef = React.useRef<?Promise<?string>>();
   if (!userIDPromiseRef.current) {
     userIDPromiseRef.current = (async () => {
       const { userID } = await commCoreModule.getCommServicesAuthMetadata();
       return userID;
     })();
   }
 
   React.useEffect(() => {
     const metadataEmitter = getCommServicesAuthMetadataEmitter();
     const subscription = metadataEmitter.addListener(
       'commServicesAuthMetadata',
       (authMetadata: UserAuthMetadata) => {
         userIDPromiseRef.current = Promise.resolve(authMetadata.userID);
       },
     );
     return () => subscription.remove();
   }, []);
 
   const accessToken = useSelector(state => state.commServicesAccessToken);
 
   const getAuthMetadata = React.useCallback<
     () => Promise<{
       +deviceID: string,
       +userID: string,
       +accessToken: string,
     }>,
   >(async () => {
     const deviceID = await getContentSigningKey();
     const userID = await userIDPromiseRef.current;
     if (!deviceID || !userID || !accessToken) {
       throw new Error('Identity service client is not initialized');
     }
     return { deviceID, userID, accessToken };
   }, [accessToken]);
 
   const client = React.useMemo<IdentityServiceClient>(
     () => ({
       deleteWalletUser: async () => {
         const {
           deviceID,
           userID,
           accessToken: token,
         } = await getAuthMetadata();
         return commRustModule.deleteWalletUser(userID, deviceID, token);
       },
       deletePasswordUser: async (password: string) => {
         const {
           deviceID,
           userID,
           accessToken: token,
         } = await getAuthMetadata();
         return commRustModule.deletePasswordUser(
           userID,
           deviceID,
           token,
           password,
         );
       },
       logOut: async () => {
         const {
           deviceID,
           userID,
           accessToken: token,
         } = await getAuthMetadata();
         return commRustModule.logOut(userID, deviceID, token);
       },
       getKeyserverKeys: async (
         keyserverID: string,
       ): Promise<DeviceOlmOutboundKeys> => {
         const {
           deviceID,
           userID,
           accessToken: token,
         } = await getAuthMetadata();
         const result = await commRustModule.getKeyserverKeys(
           userID,
           deviceID,
           token,
           keyserverID,
         );
         const resultObject = JSON.parse(result);
         const payload = resultObject?.payload;
 
         const keyserverKeys = {
           identityKeysBlob: payload ? JSON.parse(payload) : null,
           contentInitializationInfo: {
             prekey: resultObject?.contentPrekey,
             prekeySignature: resultObject?.contentPrekeySignature,
             oneTimeKey: resultObject?.oneTimeContentPrekey,
           },
           notifInitializationInfo: {
             prekey: resultObject?.notifPrekey,
             prekeySignature: resultObject?.notifPrekeySignature,
             oneTimeKey: resultObject?.oneTimeNotifPrekey,
           },
           payloadSignature: resultObject?.payloadSignature,
         };
 
         if (!keyserverKeys.contentInitializationInfo.oneTimeKey) {
           throw new Error('Missing content one time key');
         }
         if (!keyserverKeys.notifInitializationInfo.oneTimeKey) {
           throw new Error('Missing notif one time key');
         }
 
         return assertWithValidator(
           keyserverKeys,
           deviceOlmOutboundKeysValidator,
         );
       },
       getOutboundKeysForUser: async (
         targetUserID: string,
       ): Promise<UserDevicesOlmOutboundKeys[]> => {
         const {
           deviceID: authDeviceID,
           userID,
           accessToken: token,
         } = await getAuthMetadata();
         const result = await commRustModule.getOutboundKeysForUser(
           userID,
           authDeviceID,
           token,
           targetUserID,
         );
         const resultArray = JSON.parse(result);
 
         return resultArray
           .map(outboundKeysInfo => {
             try {
               const payload = outboundKeysInfo?.payload;
               const identityKeysBlob: IdentityKeysBlob = assertWithValidator(
                 payload ? JSON.parse(payload) : null,
                 identityKeysBlobValidator,
               );
               const deviceID =
                 identityKeysBlob.primaryIdentityPublicKeys.ed25519;
 
               if (
                 !outboundKeysInfo.oneTimeContentPrekey ||
                 !outboundKeysInfo.oneTimeNotifPrekey
               ) {
                 console.log(`Missing one time key for device ${deviceID}`);
                 return {
                   deviceID,
                   keys: null,
                 };
               }
 
               const deviceKeys = {
                 identityKeysBlob,
                 contentInitializationInfo: {
                   prekey: outboundKeysInfo?.contentPrekey,
                   prekeySignature: outboundKeysInfo?.contentPrekeySignature,
                   oneTimeKey: outboundKeysInfo?.oneTimeContentPrekey,
                 },
                 notifInitializationInfo: {
                   prekey: outboundKeysInfo?.notifPrekey,
                   prekeySignature: outboundKeysInfo?.notifPrekeySignature,
                   oneTimeKey: outboundKeysInfo?.oneTimeNotifPrekey,
                 },
                 payloadSignature: outboundKeysInfo?.payloadSignature,
               };
 
               try {
                 const validatedKeys = assertWithValidator(
                   deviceKeys,
                   deviceOlmOutboundKeysValidator,
                 );
                 return {
                   deviceID,
                   keys: validatedKeys,
                 };
               } catch (e) {
                 console.log(e);
                 return {
                   deviceID,
                   keys: null,
                 };
               }
             } catch (e) {
               console.log(e);
               return null;
             }
           })
           .filter(Boolean);
       },
       getInboundKeysForUser: async (
         targetUserID: string,
       ): Promise<UserDevicesOlmInboundKeys> => {
         const {
           deviceID: authDeviceID,
           userID,
           accessToken: token,
         } = await getAuthMetadata();
         const result = await commRustModule.getInboundKeysForUser(
           userID,
           authDeviceID,
           token,
           targetUserID,
         );
         const resultArray = JSON.parse(result);
 
         const devicesKeys: {
           [deviceID: string]: ?DeviceOlmInboundKeys,
         } = {};
 
         resultArray.forEach(inboundKeysInfo => {
           try {
             const payload = inboundKeysInfo?.payload;
             const identityKeysBlob: IdentityKeysBlob = assertWithValidator(
               payload ? JSON.parse(payload) : null,
               identityKeysBlobValidator,
             );
             const deviceID = identityKeysBlob.primaryIdentityPublicKeys.ed25519;
 
             const deviceKeys = {
               identityKeysBlob,
               signedPrekeys: {
                 contentPrekey: inboundKeysInfo?.contentPrekey,
                 contentPrekeySignature: inboundKeysInfo?.contentPrekeySignature,
                 notifPrekey: inboundKeysInfo?.notifPrekey,
                 notifPrekeySignature: inboundKeysInfo?.notifPrekeySignature,
               },
               payloadSignature: inboundKeysInfo?.payloadSignature,
             };
 
             try {
               devicesKeys[deviceID] = assertWithValidator(
                 deviceKeys,
                 deviceOlmInboundKeysValidator,
               );
             } catch (e) {
               console.log(e);
               devicesKeys[deviceID] = null;
             }
           } catch (e) {
             console.log(e);
           }
         });
         const device = resultArray?.[0];
 
         const inboundUserKeys = {
           keys: devicesKeys,
           username: device?.username,
           walletAddress: device?.walletAddress,
         };
 
         return assertWithValidator(
           inboundUserKeys,
           userDeviceOlmInboundKeysValidator,
         );
       },
       uploadOneTimeKeys: async (oneTimeKeys: OneTimeKeysResultValues) => {
         const {
           deviceID: authDeviceID,
           userID,
           accessToken: token,
         } = await getAuthMetadata();
 
         await commRustModule.uploadOneTimeKeys(
           userID,
           authDeviceID,
           token,
           oneTimeKeys.contentOneTimeKeys,
           oneTimeKeys.notificationsOneTimeKeys,
         );
       },
       registerPasswordUser: async (
         username: string,
         password: string,
         fid: ?string,
       ) => {
         await commCoreModule.initializeCryptoAccount();
         const [
           { blobPayload, signature, primaryIdentityPublicKeys },
           { contentOneTimeKeys, notificationsOneTimeKeys },
           prekeys,
         ] = await Promise.all([
           commCoreModule.getUserPublicKey(),
           commCoreModule.getOneTimeKeys(ONE_TIME_KEYS_NUMBER),
           commCoreModule.validateAndGetPrekeys(),
         ]);
         const registrationResult = await commRustModule.registerPasswordUser(
           username,
           password,
           blobPayload,
           signature,
           prekeys.contentPrekey,
           prekeys.contentPrekeySignature,
           prekeys.notifPrekey,
           prekeys.notifPrekeySignature,
           getOneTimeKeyValues(contentOneTimeKeys),
           getOneTimeKeyValues(notificationsOneTimeKeys),
           fid ?? '',
         );
         const { userID, accessToken: token } = JSON.parse(registrationResult);
         const identityAuthResult = { accessToken: token, userID, username };
 
         const validatedResult = assertWithValidator(
           identityAuthResult,
           identityAuthResultValidator,
         );
 
         await commCoreModule.setCommServicesAuthMetadata(
           validatedResult.userID,
           primaryIdentityPublicKeys.ed25519,
           validatedResult.accessToken,
         );
 
         return validatedResult;
       },
       logInPasswordUser: async (username: string, password: string) => {
         await commCoreModule.initializeCryptoAccount();
         const [{ blobPayload, signature, primaryIdentityPublicKeys }, prekeys] =
           await Promise.all([
             commCoreModule.getUserPublicKey(),
             commCoreModule.validateAndGetPrekeys(),
           ]);
         const loginResult = await commRustModule.logInPasswordUser(
           username,
           password,
           blobPayload,
           signature,
           prekeys.contentPrekey,
           prekeys.contentPrekeySignature,
           prekeys.notifPrekey,
           prekeys.notifPrekeySignature,
         );
         const { userID, accessToken: token } = JSON.parse(loginResult);
         const identityAuthResult = { accessToken: token, userID, username };
 
         const validatedResult = assertWithValidator(
           identityAuthResult,
           identityAuthResultValidator,
         );
 
         await commCoreModule.setCommServicesAuthMetadata(
           validatedResult.userID,
           primaryIdentityPublicKeys.ed25519,
           validatedResult.accessToken,
         );
 
         return validatedResult;
       },
       registerWalletUser: async (
         walletAddress: string,
         siweMessage: string,
         siweSignature: string,
         fid: ?string,
       ) => {
         await commCoreModule.initializeCryptoAccount();
         const [
           { blobPayload, signature, primaryIdentityPublicKeys },
           { contentOneTimeKeys, notificationsOneTimeKeys },
           prekeys,
         ] = await Promise.all([
           commCoreModule.getUserPublicKey(),
           commCoreModule.getOneTimeKeys(ONE_TIME_KEYS_NUMBER),
           commCoreModule.validateAndGetPrekeys(),
         ]);
         const registrationResult = await commRustModule.registerWalletUser(
           siweMessage,
           siweSignature,
           blobPayload,
           signature,
           prekeys.contentPrekey,
           prekeys.contentPrekeySignature,
           prekeys.notifPrekey,
           prekeys.notifPrekeySignature,
           getOneTimeKeyValues(contentOneTimeKeys),
           getOneTimeKeyValues(notificationsOneTimeKeys),
           fid ?? '',
         );
         const { userID, accessToken: token } = JSON.parse(registrationResult);
         const identityAuthResult = {
           accessToken: token,
           userID,
           username: walletAddress,
         };
 
         const validatedResult = assertWithValidator(
           identityAuthResult,
           identityAuthResultValidator,
         );
 
         await commCoreModule.setCommServicesAuthMetadata(
           validatedResult.userID,
           primaryIdentityPublicKeys.ed25519,
           validatedResult.accessToken,
         );
 
         return validatedResult;
       },
       logInWalletUser: async (
         walletAddress: string,
         siweMessage: string,
         siweSignature: string,
       ) => {
         await commCoreModule.initializeCryptoAccount();
         const [{ blobPayload, signature, primaryIdentityPublicKeys }, prekeys] =
           await Promise.all([
             commCoreModule.getUserPublicKey(),
             commCoreModule.validateAndGetPrekeys(),
           ]);
         const loginResult = await commRustModule.logInWalletUser(
           siweMessage,
           siweSignature,
           blobPayload,
           signature,
           prekeys.contentPrekey,
           prekeys.contentPrekeySignature,
           prekeys.notifPrekey,
           prekeys.notifPrekeySignature,
         );
         const { userID, accessToken: token } = JSON.parse(loginResult);
         const identityAuthResult = {
           accessToken: token,
           userID,
           username: walletAddress,
         };
 
         const validatedResult = assertWithValidator(
           identityAuthResult,
           identityAuthResultValidator,
         );
 
         await commCoreModule.setCommServicesAuthMetadata(
           validatedResult.userID,
           primaryIdentityPublicKeys.ed25519,
           validatedResult.accessToken,
         );
 
         return validatedResult;
       },
       uploadKeysForRegisteredDeviceAndLogIn: async (
         userID: string,
         nonceChallengeResponse: SignedNonce,
       ) => {
         await commCoreModule.initializeCryptoAccount();
         const [
           { blobPayload, signature, primaryIdentityPublicKeys },
           { contentOneTimeKeys, notificationsOneTimeKeys },
           prekeys,
         ] = await Promise.all([
           commCoreModule.getUserPublicKey(),
           commCoreModule.getOneTimeKeys(ONE_TIME_KEYS_NUMBER),
           commCoreModule.validateAndGetPrekeys(),
         ]);
         const { nonce, nonceSignature } = nonceChallengeResponse;
         const registrationResult =
           await commRustModule.uploadSecondaryDeviceKeysAndLogIn(
             userID,
             nonce,
             nonceSignature,
             blobPayload,
             signature,
             prekeys.contentPrekey,
             prekeys.contentPrekeySignature,
             prekeys.notifPrekey,
             prekeys.notifPrekeySignature,
             getOneTimeKeyValues(contentOneTimeKeys),
             getOneTimeKeyValues(notificationsOneTimeKeys),
           );
         const { accessToken: token } = JSON.parse(registrationResult);
 
         const identityAuthResult = { accessToken: token, userID, username: '' };
         const validatedResult = assertWithValidator(
           identityAuthResult,
           identityAuthResultValidator,
         );
 
         await commCoreModule.setCommServicesAuthMetadata(
           validatedResult.userID,
           primaryIdentityPublicKeys.ed25519,
           validatedResult.accessToken,
         );
 
         return validatedResult;
       },
       generateNonce: commRustModule.generateNonce,
       getDeviceListHistoryForUser: async (
         userID: string,
         sinceTimestamp?: number,
       ) => {
         const {
           deviceID: authDeviceID,
           userID: authUserID,
           accessToken: token,
         } = await getAuthMetadata();
         const result = await commRustModule.getDeviceListForUser(
           authUserID,
           authDeviceID,
           token,
           userID,
           sinceTimestamp,
         );
         const rawPayloads: string[] = JSON.parse(result);
         const deviceLists: SignedDeviceList[] = rawPayloads.map(payload =>
           JSON.parse(payload),
         );
         return assertWithValidator(
           deviceLists,
           signedDeviceListHistoryValidator,
         );
       },
+      getDeviceListsForUsers: async (userIDs: $ReadOnlyArray<string>) => {
+        const {
+          deviceID: authDeviceID,
+          userID: authUserID,
+          accessToken: token,
+        } = await getAuthMetadata();
+        const result = await commRustModule.getDeviceListsForUsers(
+          authUserID,
+          authDeviceID,
+          token,
+          userIDs,
+        );
+        const rawPayloads: { +[userID: string]: string } = JSON.parse(result);
+
+        let usersDeviceLists: UsersSignedDeviceLists = {};
+        for (const userID in rawPayloads) {
+          usersDeviceLists = {
+            ...usersDeviceLists,
+            [userID]: JSON.parse(rawPayloads[userID]),
+          };
+        }
+
+        return assertWithValidator(
+          usersDeviceLists,
+          usersSignedDeviceListsValidator,
+        );
+      },
       updateDeviceList: async (newDeviceList: SignedDeviceList) => {
         const {
           deviceID: authDeviceID,
           userID,
           accessToken: authAccessToken,
         } = await getAuthMetadata();
         const payload = JSON.stringify(newDeviceList);
         await commRustModule.updateDeviceList(
           userID,
           authDeviceID,
           authAccessToken,
           payload,
         );
       },
       getFarcasterUsers: async (farcasterIDs: $ReadOnlyArray<string>) => {
         const farcasterUsersJSONString =
           await commRustModule.getFarcasterUsers(farcasterIDs);
         const farcasterUsers = JSON.parse(farcasterUsersJSONString);
         return assertWithValidator(farcasterUsers, farcasterUsersValidator);
       },
       linkFarcasterAccount: async (farcasterID: string) => {
         const {
           deviceID,
           userID,
           accessToken: token,
         } = await getAuthMetadata();
         return commRustModule.linkFarcasterAccount(
           userID,
           deviceID,
           token,
           farcasterID,
         );
       },
       unlinkFarcasterAccount: async () => {
         const {
           deviceID,
           userID,
           accessToken: token,
         } = await getAuthMetadata();
         return commRustModule.unlinkFarcasterAccount(userID, deviceID, token);
       },
     }),
     [getAuthMetadata],
   );
 
   const value = React.useMemo(
     () => ({
       identityClient: client,
       getAuthMetadata,
     }),
     [client, getAuthMetadata],
   );
 
   return (
     <IdentityClientContext.Provider value={value}>
       {children}
     </IdentityClientContext.Provider>
   );
 }
 
 export default IdentityServiceContextProvider;