diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index 91d1a29b..65d553a5 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -9,7 +9,11 @@
       "Bash(cat:*)",
       "Bash(git add:*)",
       "Bash(git commit:*)",
-      "Bash(git push)"
+      "Bash(git push)",
+      "Bash(find:*)",
+      "Bash(npm run build:*)",
+      "Bash(npx prisma generate:*)",
+      "Bash(npx tsc:*)"
     ],
     "deny": [],
     "ask": []
diff --git a/backend/services/backup-service/src/api/controllers/backup-share.controller.ts b/backend/services/backup-service/src/api/controllers/backup-share.controller.ts
index 6cbd7694..380f3f4e 100644
--- a/backend/services/backup-service/src/api/controllers/backup-share.controller.ts
+++ b/backend/services/backup-service/src/api/controllers/backup-share.controller.ts
@@ -6,6 +6,7 @@ import {
   HttpCode,
   HttpStatus,
   Req,
+  Logger,
 } from '@nestjs/common';
 import { BackupShareApplicationService } from '../../application/services/backup-share-application.service';
 import { StoreBackupShareCommand } from '../../application/commands/store-backup-share/store-backup-share.command';
@@ -24,6 +25,8 @@ import {
 @Controller('backup-share')
 @UseGuards(ServiceAuthGuard)
 export class BackupShareController {
+  private readonly logger = new Logger(BackupShareController.name);
+
   constructor(
     private readonly backupShareService: BackupShareApplicationService,
   ) {}
@@ -34,24 +37,33 @@ export class BackupShareController {
     @Body() dto: StoreShareDto,
     @Req() request: any,
   ): Promise<StoreShareResponseDto> {
-    const command = new StoreBackupShareCommand(
-      dto.userId,
-      dto.accountSequence,
-      dto.publicKey,
-      dto.encryptedShareData,
-      request.sourceService,
-      request.sourceIp,
-      dto.threshold,
-      dto.totalParties,
-    );
+    this.logger.log(`[STORE] Received store request: userId=${dto.userId}, accountSequence=${dto.accountSequence}, publicKey=${dto.publicKey?.substring(0, 20)}...`);
 
-    const result = await this.backupShareService.storeBackupShare(command);
+    try {
+      const command = new StoreBackupShareCommand(
+        dto.userId,
+        dto.accountSequence,
+        dto.publicKey,
+        dto.encryptedShareData,
+        request.sourceService,
+        request.sourceIp,
+        dto.threshold,
+        dto.totalParties,
+      );
 
-    return {
-      success: true,
-      shareId: result.shareId,
-      message: 'Backup share stored successfully',
-    };
+      const result = await this.backupShareService.storeBackupShare(command);
+
+      this.logger.log(`[STORE] SUCCESS: shareId=${result.shareId}, userId=${dto.userId}, accountSequence=${dto.accountSequence}`);
+
+      return {
+        success: true,
+        shareId: result.shareId,
+        message: 'Backup share stored successfully',
+      };
+    } catch (error) {
+      this.logger.error(`[STORE] FAILED: userId=${dto.userId}, accountSequence=${dto.accountSequence}, error=${error.message}`);
+      throw error;
+    }
   }
 
   @Post('retrieve')
diff --git a/backend/services/mpc-service/src/application/event-handlers/keygen-requested.handler.ts b/backend/services/mpc-service/src/application/event-handlers/keygen-requested.handler.ts
index 20dfaf0a..c0a68b60 100644
--- a/backend/services/mpc-service/src/application/event-handlers/keygen-requested.handler.ts
+++ b/backend/services/mpc-service/src/application/event-handlers/keygen-requested.handler.ts
@@ -105,13 +105,14 @@ export class KeygenRequestedHandler implements OnModuleInit {
           try {
             await this.backupClient.storeBackupShare({
               userId,
+              accountSequence,
               username,
               publicKey: result.publicKey,
               partyId: result.delegateShare.partyId,
               partyIndex: result.delegateShare.partyIndex,
               encryptedShare: result.delegateShare.encryptedShare,
             });
-            this.logger.log(`Delegate share stored to backup-service: userId=${userId}`);
+            this.logger.log(`Delegate share stored to backup-service: userId=${userId}, accountSequence=${accountSequence}`);
           } catch (backupError) {
             // 备份失败不阻塞主流程，但记录错误
             this.logger.error(`Failed to store delegate share to backup-service: userId=${userId}`, backupError);
diff --git a/backend/services/mpc-service/src/infrastructure/external/backup/backup-client.service.ts b/backend/services/mpc-service/src/infrastructure/external/backup/backup-client.service.ts
index e6387115..b9d563ea 100644
--- a/backend/services/mpc-service/src/infrastructure/external/backup/backup-client.service.ts
+++ b/backend/services/mpc-service/src/infrastructure/external/backup/backup-client.service.ts
@@ -13,6 +13,7 @@ import * as jwt from 'jsonwebtoken';
 
 export interface StoreBackupShareParams {
   userId: string;
+  accountSequence: number;
   username: string;
   publicKey: string;
   partyId: string;
@@ -77,10 +78,8 @@ export class BackupClientService {
           `${this.backupServiceUrl}/backup-share/store`,
           {
             userId: params.userId,
-            username: params.username,
+            accountSequence: params.accountSequence,
             publicKey: params.publicKey,
-            partyId: params.partyId,
-            partyIndex: params.partyIndex,
             encryptedShareData: params.encryptedShare,
           },
           {