diff --git a/lib/actions/user-actions.js b/lib/actions/user-actions.js
--- a/lib/actions/user-actions.js
+++ b/lib/actions/user-actions.js
@@ -508,6 +508,16 @@
     [identityClient],
   );
 }
+function useIdentityWalletLogIn(): (
+  walletAddress: string,
+  siweMessage: string,
+  siweSignature: string,
+) => Promise<IdentityAuthResult> {
+  const client = React.useContext(IdentityClientContext);
+  const identityClient = client?.identityClient;
+  invariant(identityClient, 'Identity client should be set');
+  return identityClient.logInWalletUser;
+}
 
 const logInActionTypes = Object.freeze({
   started: 'LOG_IN_STARTED',
@@ -802,6 +812,7 @@
   logIn as logInRawAction,
   identityLogInActionTypes,
   useIdentityPasswordLogIn,
+  useIdentityWalletLogIn,
   useLogIn,
   logInActionTypes,
   useLogOut,
diff --git a/lib/types/identity-service-types.js b/lib/types/identity-service-types.js
--- a/lib/types/identity-service-types.js
+++ b/lib/types/identity-service-types.js
@@ -67,6 +67,11 @@
     userID: string,
   ) => Promise<UserDevicesOlmOutboundKeys[]>;
   +generateNonce: () => Promise<string>;
+  +logInWalletUser: (
+    walletAddress: string,
+    siweMessage: string,
+    siweSignature: string,
+  ) => Promise<IdentityAuthResult>;
 }
 
 export type IdentityServiceAuthLayer = {
diff --git a/native/identity-service/identity-service-context-provider.react.js b/native/identity-service/identity-service-context-provider.react.js
--- a/native/identity-service/identity-service-context-provider.react.js
+++ b/native/identity-service/identity-service-context-provider.react.js
@@ -260,6 +260,45 @@
           identityAuthResultValidator,
         );
       },
+      logInWalletUser: async (
+        walletAddress: string,
+        siweMessage: string,
+        siweSignature: string,
+      ) => {
+        await commCoreModule.initializeCryptoAccount();
+        const [
+          { blobPayload, signature },
+          { contentOneTimeKeys, notificationsOneTimeKeys },
+          prekeys,
+        ] = await Promise.all([
+          commCoreModule.getUserPublicKey(),
+          commCoreModule.getOneTimeKeys(ONE_TIME_KEYS_NUMBER),
+          commCoreModule.validateAndGetPrekeys(),
+        ]);
+        const loginResult = await commRustModule.logInWalletUser(
+          siweMessage,
+          siweSignature,
+          blobPayload,
+          signature,
+          prekeys.contentPrekey,
+          prekeys.contentPrekeySignature,
+          prekeys.notifPrekey,
+          prekeys.notifPrekeySignature,
+          getOneTimeKeyValues(contentOneTimeKeys),
+          getOneTimeKeyValues(notificationsOneTimeKeys),
+        );
+        const { userID, accessToken: token } = JSON.parse(loginResult);
+        const identityAuthResult = {
+          accessToken: token,
+          userID,
+          username: walletAddress,
+        };
+
+        return assertWithValidator(
+          identityAuthResult,
+          identityAuthResultValidator,
+        );
+      },
       generateNonce: commRustModule.generateNonce,
     }),
     [getAuthMetadata],
diff --git a/web/grpc/identity-service-client-wrapper.js b/web/grpc/identity-service-client-wrapper.js
--- a/web/grpc/identity-service-client-wrapper.js
+++ b/web/grpc/identity-service-client-wrapper.js
@@ -28,6 +28,7 @@
   OpaqueLoginFinishRequest,
   OpaqueLoginStartRequest,
   Prekey,
+  WalletLoginRequest,
 } from '../protobufs/identity-unauth-structs.cjs';
 import * as IdentityUnauthClient from '../protobufs/identity-unauth.cjs';
 
@@ -282,6 +283,38 @@
     return assertWithValidator(identityAuthResult, identityAuthResultValidator);
   };
 
+  logInWalletUser: (
+    walletAddress: string,
+    siweMessage: string,
+    siweSignature: string,
+  ) => Promise<IdentityAuthResult> = async (
+    walletAddress: string,
+    siweMessage: string,
+    siweSignature: string,
+  ) => {
+    const identityDeviceKeyUpload = await this.getDeviceKeyUpload();
+    const deviceKeyUpload = authDeviceKeyUpload(identityDeviceKeyUpload);
+
+    const loginRequest = new WalletLoginRequest();
+    loginRequest.setSiweMessage(siweMessage);
+    loginRequest.setSiweSignature(siweSignature);
+    loginRequest.setDeviceKeyUpload(deviceKeyUpload);
+
+    let loginResponse;
+    try {
+      loginResponse = await this.unauthClient.logInWalletUser(loginRequest);
+    } catch (e) {
+      console.log('Error calling logInWalletUser:', e);
+      throw new Error(getMessageForException(e) ?? 'unknown');
+    }
+
+    const userID = loginResponse.getUserId();
+    const accessToken = loginResponse.getAccessToken();
+    const identityAuthResult = { accessToken, userID, username: walletAddress };
+
+    return assertWithValidator(identityAuthResult, identityAuthResultValidator);
+  };
+
   generateNonce: () => Promise<string> = async () => {
     const result = await this.unauthClient.generateNonce(new Empty());
     return result.getNonce();