.

2025-11-24 07:47:29 +00:00 · 2025-11-24 07:47:29 +00:00 · 4b03c422ea
parent e2055483db
commit 4b03c422ea
96 changed files with 5052 additions and 0 deletions
--- a/backend/services/identity-service/identity-service/.env.development
+++ b/backend/services/identity-service/identity-service/.env.development
@ -0,0 +1,29 @@
+# Database
+DATABASE_URL="postgresql://postgres:password@localhost:5432/rwa_identity?schema=public"
+
+# JWT
+JWT_SECRET="dev-jwt-secret-key"
+JWT_ACCESS_EXPIRES_IN="2h"
+JWT_REFRESH_EXPIRES_IN="30d"
+
+# Redis
+REDIS_HOST="localhost"
+REDIS_PORT=6379
+REDIS_PASSWORD=""
+REDIS_DB=0
+
+# Kafka
+KAFKA_BROKERS="localhost:9092"
+KAFKA_CLIENT_ID="identity-service"
+KAFKA_GROUP_ID="identity-service-group"
+
+# SMS Service
+SMS_API_URL="https://sms-api.example.com"
+SMS_API_KEY="dev-sms-api-key"
+
+# App
+APP_PORT=3000
+APP_ENV="development"
+
+# Blockchain Encryption
+WALLET_ENCRYPTION_SALT="dev-wallet-salt"
--- a/backend/services/identity-service/identity-service/.env.example
+++ b/backend/services/identity-service/identity-service/.env.example
@ -0,0 +1,29 @@
+# Database
+DATABASE_URL="postgresql://postgres:password@localhost:5432/rwa_identity?schema=public"
+
+# JWT
+JWT_SECRET="your-super-secret-jwt-key-change-in-production"
+JWT_ACCESS_EXPIRES_IN="2h"
+JWT_REFRESH_EXPIRES_IN="30d"
+
+# Redis
+REDIS_HOST="localhost"
+REDIS_PORT=6379
+REDIS_PASSWORD=""
+REDIS_DB=0
+
+# Kafka
+KAFKA_BROKERS="localhost:9092"
+KAFKA_CLIENT_ID="identity-service"
+KAFKA_GROUP_ID="identity-service-group"
+
+# SMS Service
+SMS_API_URL="https://sms-api.example.com"
+SMS_API_KEY="your-sms-api-key"
+
+# App
+APP_PORT=3000
+APP_ENV="development"
+
+# Blockchain Encryption
+WALLET_ENCRYPTION_SALT="rwa-wallet-salt-change-in-production"
--- a/backend/services/identity-service/identity-service/.env.production
+++ b/backend/services/identity-service/identity-service/.env.production
@ -0,0 +1,29 @@
+# Database
+DATABASE_URL="postgresql://${DB_USER}:${DB_PASSWORD}@${DB_HOST}:5432/${DB_NAME}?schema=public"
+
+# JWT
+JWT_SECRET="${JWT_SECRET}"
+JWT_ACCESS_EXPIRES_IN="2h"
+JWT_REFRESH_EXPIRES_IN="30d"
+
+# Redis
+REDIS_HOST="${REDIS_HOST}"
+REDIS_PORT=6379
+REDIS_PASSWORD="${REDIS_PASSWORD}"
+REDIS_DB=0
+
+# Kafka
+KAFKA_BROKERS="${KAFKA_BROKERS}"
+KAFKA_CLIENT_ID="identity-service"
+KAFKA_GROUP_ID="identity-service-group"
+
+# SMS Service
+SMS_API_URL="${SMS_API_URL}"
+SMS_API_KEY="${SMS_API_KEY}"
+
+# App
+APP_PORT=3000
+APP_ENV="production"
+
+# Blockchain Encryption
+WALLET_ENCRYPTION_SALT="${WALLET_ENCRYPTION_SALT}"
--- a/backend/services/identity-service/identity-service/Dockerfile
+++ b/backend/services/identity-service/identity-service/Dockerfile
@ -0,0 +1,30 @@
+# Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+COPY package*.json ./
+COPY src/infrastructure/persistence/prisma ./src/infrastructure/persistence/prisma/
+
+RUN npm ci
+
+COPY . .
+
+RUN npm run prisma:generate
+RUN npm run build
+
+# Production stage
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/src/infrastructure/persistence/prisma ./src/infrastructure/persistence/prisma
+COPY --from=builder /app/package*.json ./
+
+ENV NODE_ENV=production
+
+EXPOSE 3000
+
+CMD ["npm", "run", "start:prod"]
--- a/backend/services/identity-service/identity-service/README.md
+++ b/backend/services/identity-service/identity-service/README.md
@ -0,0 +1,124 @@
+# Identity Service
+
+RWA用户身份上下文微服务 - 基于DDD架构的NestJS实现
+
+## 技术栈
+
+- **框架**: NestJS + TypeScript
+- **ORM**: Prisma
+- **消息队列**: Kafka
+- **缓存**: Redis (ioredis)
+- **区块链**: ethers.js + @scure/bip32 + bech32
+
+## 项目结构
+
+```
+src/
+├── api/                    # 表现层
+│   ├── controllers/        # 控制器
+│   └── dto/               # 请求/响应DTO
+├── application/           # 应用层
+│   ├── commands/          # 命令对象
+│   └── services/          # 应用服务
+├── domain/                # 领域层
+│   ├── aggregates/        # 聚合根
+│   ├── entities/          # 实体
+│   ├── events/            # 领域事件
+│   ├── repositories/      # 仓储接口
+│   ├── services/          # 领域服务
+│   └── value-objects/     # 值对象
+├── infrastructure/        # 基础设施层
+│   ├── persistence/       # 持久化
+│   ├── redis/            # Redis服务
+│   ├── kafka/            # Kafka事件发布
+│   └── external/         # 外部服务
+├── shared/               # 共享层
+│   ├── decorators/       # 装饰器
+│   ├── guards/           # 守卫
+│   ├── filters/          # 过滤器
+│   └── exceptions/       # 异常类
+└── config/               # 配置
+```
+
+## 核心功能
+
+- ✅ 用户账户自动创建(首次打开APP)
+- ✅ 多设备管理与授权(最多5个设备)
+- ✅ 三链钱包地址生成(KAVA/DST/BSC)
+- ✅ 助记词生成与加密存储
+- ✅ 序列号+助记词恢复账户
+- ✅ 序列号+手机号恢复账户
+- ✅ KYC实名认证
+- ✅ 推荐码生成与验证
+- ✅ Token自动刷新机制
+
+## 快速开始
+
+### 1. 安装依赖
+
+```bash
+npm install
+```
+
+### 2. 配置环境变量
+
+```bash
+cp .env.example .env
+# 编辑 .env 文件配置数据库等信息
+```
+
+### 3. 初始化数据库
+
+```bash
+npm run prisma:generate
+npm run prisma:migrate
+```
+
+### 4. 启动服务
+
+```bash
+# 开发模式
+npm run start:dev
+
+# 生产模式
+npm run build
+npm run start:prod
+```
+
+### 5. Docker部署
+
+```bash
+docker-compose up -d
+```
+
+## API文档
+
+启动服务后访问: http://localhost:3000/api/docs
+
+## 主要API
+
+| 方法 | 路径 | 说明 |
+|------|------|------|
+| POST | /user/auto-create | 自动创建账户 |
+| POST | /user/recover-by-mnemonic | 助记词恢复 |
+| POST | /user/recover-by-phone | 手机号恢复 |
+| POST | /user/auto-login | 自动登录 |
+| GET | /user/my-profile | 我的资料 |
+| GET | /user/my-devices | 我的设备 |
+| POST | /user/bind-phone | 绑定手机号 |
+| POST | /user/submit-kyc | 提交KYC |
+
+## 领域不变式
+
+1. 手机号在系统内唯一(可为空)
+2. 账户序列号全局唯一且递增
+3. 每个账户最多5个设备同时登录
+4. KYC认证通过后身份信息不可修改
+5. 每个区块链地址只能绑定一个账户
+6. 推荐人序列号一旦设置终生不可修改
+7. 助记词必须加密存储,只在创建时返回一次
+8. 三条链的钱包地址必须从同一个助记词派生
+
+## License
+
+Proprietary
--- a/backend/services/identity-service/identity-service/database/init.sql
+++ b/backend/services/identity-service/identity-service/database/init.sql
@ -0,0 +1,7 @@
+-- ============================================
+-- Identity Context 数据库初始化 (PostgreSQL)
+-- ============================================
+
+-- 初始化账户序列号生成器
+INSERT INTO account_sequence_generator (id, current_sequence) VALUES (1, 0)
+ON CONFLICT (id) DO NOTHING;
--- a/backend/services/identity-service/identity-service/docker-compose.yml
+++ b/backend/services/identity-service/identity-service/docker-compose.yml
@ -0,0 +1,69 @@
+version: '3.8'
+
+services:
+  identity-service:
+    build: .
+    ports:
+      - "3000:3000"
+    environment:
+      - DATABASE_URL=postgresql://postgres:password@postgres:5432/rwa_identity?schema=public
+      - JWT_SECRET=your-super-secret-jwt-key-change-in-production
+      - JWT_ACCESS_EXPIRES_IN=2h
+      - JWT_REFRESH_EXPIRES_IN=30d
+      - REDIS_HOST=redis
+      - REDIS_PORT=6379
+      - KAFKA_BROKERS=kafka:9092
+      - APP_PORT=3000
+      - APP_ENV=production
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_started
+      kafka:
+        condition: service_started
+
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=password
+      - POSTGRES_DB=rwa_identity
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  redis:
+    image: redis:7-alpine
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis_data:/data
+
+  zookeeper:
+    image: confluentinc/cp-zookeeper:7.5.0
+    environment:
+      ZOOKEEPER_CLIENT_PORT: 2181
+      ZOOKEEPER_TICK_TIME: 2000
+
+  kafka:
+    image: confluentinc/cp-kafka:7.5.0
+    depends_on:
+      - zookeeper
+    ports:
+      - "9092:9092"
+    environment:
+      KAFKA_BROKER_ID: 1
+      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
+      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092
+      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
+
+volumes:
+  postgres_data:
+  redis_data:
--- a/backend/services/identity-service/identity-service/nest-cli.json
+++ b/backend/services/identity-service/identity-service/nest-cli.json
@ -0,0 +1,17 @@
+{
+  "$schema": "https://json.schemastore.org/nest-cli",
+  "collection": "@nestjs/schematics",
+  "sourceRoot": "src",
+  "compilerOptions": {
+    "deleteOutDir": true,
+    "plugins": [
+      {
+        "name": "@nestjs/swagger",
+        "options": {
+          "classValidatorShim": true,
+          "introspectComments": true
+        }
+      }
+    ]
+  }
+}
--- a/backend/services/identity-service/identity-service/package.json
+++ b/backend/services/identity-service/identity-service/package.json
@ -0,0 +1,87 @@
+{
+  "name": "identity-service",
+  "version": "1.0.0",
+  "description": "RWA Identity & User Context Service",
+  "author": "RWA Team",
+  "private": true,
+  "license": "UNLICENSED",
+  "prisma": {
+    "schema": "src/infrastructure/persistence/prisma/schema.prisma"
+  },
+  "scripts": {
+    "build": "nest build",
+    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
+    "start": "nest start",
+    "start:dev": "nest start --watch",
+    "start:debug": "nest start --debug --watch",
+    "start:prod": "node dist/main",
+    "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:cov": "jest --coverage",
+    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
+    "test:e2e": "jest --config ./test/jest-e2e.json",
+    "prisma:generate": "prisma generate",
+    "prisma:migrate": "prisma migrate dev",
+    "prisma:migrate:prod": "prisma migrate deploy",
+    "prisma:studio": "prisma studio"
+  },
+  "dependencies": {
+    "@nestjs/common": "^10.0.0",
+    "@nestjs/config": "^3.1.1",
+    "@nestjs/core": "^10.0.0",
+    "@nestjs/jwt": "^10.2.0",
+    "@nestjs/microservices": "^10.0.0",
+    "@nestjs/platform-express": "^10.0.0",
+    "@nestjs/swagger": "^7.1.17",
+    "@prisma/client": "^5.7.0",
+    "@scure/bip32": "^1.3.2",
+    "@scure/bip39": "^1.2.1",
+    "bech32": "^2.0.0",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.0",
+    "ethers": "^6.9.0",
+    "ioredis": "^5.3.2",
+    "kafkajs": "^2.2.4",
+    "reflect-metadata": "^0.1.13",
+    "rxjs": "^7.8.1",
+    "uuid": "^9.0.0"
+  },
+  "devDependencies": {
+    "@nestjs/cli": "^10.0.0",
+    "@nestjs/schematics": "^10.0.0",
+    "@nestjs/testing": "^10.0.0",
+    "@types/express": "^4.17.17",
+    "@types/jest": "^29.5.2",
+    "@types/node": "^20.3.1",
+    "@types/uuid": "^9.0.0",
+    "@typescript-eslint/eslint-plugin": "^6.0.0",
+    "@typescript-eslint/parser": "^6.0.0",
+    "eslint": "^8.42.0",
+    "eslint-config-prettier": "^9.0.0",
+    "eslint-plugin-prettier": "^5.0.0",
+    "jest": "^29.5.0",
+    "prettier": "^3.0.0",
+    "prisma": "^5.7.0",
+    "source-map-support": "^0.5.21",
+    "ts-jest": "^29.1.0",
+    "ts-loader": "^9.4.3",
+    "ts-node": "^10.9.1",
+    "tsconfig-paths": "^4.2.0",
+    "typescript": "^5.1.3"
+  },
+  "jest": {
+    "moduleFileExtensions": ["js", "json", "ts"],
+    "rootDir": "src",
+    "testRegex": ".*\\.spec\\.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "collectCoverageFrom": ["**/*.(t|j)s"],
+    "coverageDirectory": "../coverage",
+    "testEnvironment": "node",
+    "moduleNameMapper": {
+      "^@/(.*)$": "<rootDir>/$1"
+    }
+  }
+}
--- a/backend/services/identity-service/identity-service/src/api/api.module.ts
+++ b/backend/services/identity-service/identity-service/src/api/api.module.ts
@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { UserAccountController } from './controllers/user-account.controller';
+import { AuthController } from './controllers/auth.controller';
+import { ApplicationModule } from '@/application/application.module';
+
+@Module({
+  imports: [ApplicationModule],
+  controllers: [UserAccountController, AuthController],
+})
+export class ApiModule {}
--- a/backend/services/identity-service/identity-service/src/api/controllers/auth.controller.ts
+++ b/backend/services/identity-service/identity-service/src/api/controllers/auth.controller.ts
@ -0,0 +1,19 @@
+import { Controller, Post, Body } from '@nestjs/common';
+import { ApiTags, ApiOperation } from '@nestjs/swagger';
+import { UserApplicationService } from '@/application/services/user-application.service';
+import { Public } from '@/shared/guards/jwt-auth.guard';
+import { AutoLoginCommand } from '@/application/commands';
+import { AutoLoginDto } from '@/api/dto';
+
+@ApiTags('Auth')
+@Controller('auth')
+export class AuthController {
+  constructor(private readonly userService: UserApplicationService) {}
+
+  @Public()
+  @Post('refresh')
+  @ApiOperation({ summary: 'Token刷新' })
+  async refresh(@Body() dto: AutoLoginDto) {
+    return this.userService.autoLogin(new AutoLoginCommand(dto.refreshToken, dto.deviceId));
+  }
+}
--- a/backend/services/identity-service/identity-service/src/api/controllers/user-account.controller.ts
+++ b/backend/services/identity-service/identity-service/src/api/controllers/user-account.controller.ts
@ -0,0 +1,169 @@
+import { Controller, Post, Get, Put, Body, Param, UseGuards, Headers } from '@nestjs/common';
+import { ApiTags, ApiOperation, ApiBearerAuth, ApiResponse } from '@nestjs/swagger';
+import { UserApplicationService } from '@/application/services/user-application.service';
+import { JwtAuthGuard, Public, CurrentUser, CurrentUserData } from '@/shared/guards/jwt-auth.guard';
+import {
+  AutoCreateAccountCommand, RecoverByMnemonicCommand, RecoverByPhoneCommand,
+  AutoLoginCommand, RegisterCommand, LoginCommand, BindPhoneNumberCommand,
+  UpdateProfileCommand, SubmitKYCCommand, RemoveDeviceCommand, SendSmsCodeCommand,
+  GetMyProfileQuery, GetMyDevicesQuery, GetUserByReferralCodeQuery,
+} from '@/application/commands';
+import {
+  AutoCreateAccountDto, RecoverByMnemonicDto, RecoverByPhoneDto, AutoLoginDto,
+  SendSmsCodeDto, RegisterDto, LoginDto, BindPhoneDto, UpdateProfileDto,
+  BindWalletDto, SubmitKYCDto, RemoveDeviceDto,
+  AutoCreateAccountResponseDto, RecoverAccountResponseDto, LoginResponseDto,
+  UserProfileResponseDto, DeviceResponseDto,
+} from '@/api/dto';
+
+@ApiTags('User')
+@Controller('user')
+@UseGuards(JwtAuthGuard)
+export class UserAccountController {
+  constructor(private readonly userService: UserApplicationService) {}
+
+  @Public()
+  @Post('auto-create')
+  @ApiOperation({ summary: '自动创建账户(首次打开APP)' })
+  @ApiResponse({ status: 200, type: AutoCreateAccountResponseDto })
+  async autoCreate(@Body() dto: AutoCreateAccountDto) {
+    return this.userService.autoCreateAccount(
+      new AutoCreateAccountCommand(
+        dto.deviceId, dto.deviceName, dto.inviterReferralCode,
+        dto.provinceCode, dto.cityCode,
+      ),
+    );
+  }
+
+  @Public()
+  @Post('recover-by-mnemonic')
+  @ApiOperation({ summary: '用序列号+助记词恢复账户' })
+  @ApiResponse({ status: 200, type: RecoverAccountResponseDto })
+  async recoverByMnemonic(@Body() dto: RecoverByMnemonicDto) {
+    return this.userService.recoverByMnemonic(
+      new RecoverByMnemonicCommand(
+        dto.accountSequence, dto.mnemonic, dto.newDeviceId, dto.deviceName,
+      ),
+    );
+  }
+
+  @Public()
+  @Post('recover-by-phone')
+  @ApiOperation({ summary: '用序列号+手机号恢复账户' })
+  @ApiResponse({ status: 200, type: RecoverAccountResponseDto })
+  async recoverByPhone(@Body() dto: RecoverByPhoneDto) {
+    return this.userService.recoverByPhone(
+      new RecoverByPhoneCommand(
+        dto.accountSequence, dto.phoneNumber, dto.smsCode,
+        dto.newDeviceId, dto.deviceName,
+      ),
+    );
+  }
+
+  @Public()
+  @Post('auto-login')
+  @ApiOperation({ summary: '自动登录(Token刷新)' })
+  @ApiResponse({ status: 200, type: LoginResponseDto })
+  async autoLogin(@Body() dto: AutoLoginDto) {
+    return this.userService.autoLogin(
+      new AutoLoginCommand(dto.refreshToken, dto.deviceId),
+    );
+  }
+
+  @Public()
+  @Post('send-sms-code')
+  @ApiOperation({ summary: '发送短信验证码' })
+  async sendSmsCode(@Body() dto: SendSmsCodeDto) {
+    await this.userService.sendSmsCode(new SendSmsCodeCommand(dto.phoneNumber, dto.type));
+    return { message: '验证码已发送' };
+  }
+
+  @Public()
+  @Post('register')
+  @ApiOperation({ summary: '用户注册(手机号)' })
+  @ApiResponse({ status: 200, type: LoginResponseDto })
+  async register(@Body() dto: RegisterDto) {
+    return this.userService.register(
+      new RegisterCommand(
+        dto.phoneNumber, dto.smsCode, dto.deviceId,
+        dto.provinceCode, dto.cityCode, dto.deviceName, dto.inviterReferralCode,
+      ),
+    );
+  }
+
+  @Public()
+  @Post('login')
+  @ApiOperation({ summary: '用户登录(手机号)' })
+  @ApiResponse({ status: 200, type: LoginResponseDto })
+  async login(@Body() dto: LoginDto) {
+    return this.userService.login(
+      new LoginCommand(dto.phoneNumber, dto.smsCode, dto.deviceId),
+    );
+  }
+
+  @Post('bind-phone')
+  @ApiBearerAuth()
+  @ApiOperation({ summary: '绑定手机号' })
+  async bindPhone(@CurrentUser() user: CurrentUserData, @Body() dto: BindPhoneDto) {
+    await this.userService.bindPhoneNumber(
+      new BindPhoneNumberCommand(user.userId, dto.phoneNumber, dto.smsCode),
+    );
+    return { message: '绑定成功' };
+  }
+
+  @Get('my-profile')
+  @ApiBearerAuth()
+  @ApiOperation({ summary: '查询我的资料' })
+  @ApiResponse({ status: 200, type: UserProfileResponseDto })
+  async getMyProfile(@CurrentUser() user: CurrentUserData) {
+    return this.userService.getMyProfile(new GetMyProfileQuery(user.userId));
+  }
+
+  @Put('update-profile')
+  @ApiBearerAuth()
+  @ApiOperation({ summary: '更新用户资料' })
+  async updateProfile(@CurrentUser() user: CurrentUserData, @Body() dto: UpdateProfileDto) {
+    await this.userService.updateProfile(
+      new UpdateProfileCommand(user.userId, dto.nickname, dto.avatarUrl, dto.address),
+    );
+    return { message: '更新成功' };
+  }
+
+  @Post('submit-kyc')
+  @ApiBearerAuth()
+  @ApiOperation({ summary: '提交KYC认证' })
+  async submitKYC(@CurrentUser() user: CurrentUserData, @Body() dto: SubmitKYCDto) {
+    await this.userService.submitKYC(
+      new SubmitKYCCommand(
+        user.userId, dto.realName, dto.idCardNumber,
+        dto.idCardFrontUrl, dto.idCardBackUrl,
+      ),
+    );
+    return { message: '提交成功' };
+  }
+
+  @Get('my-devices')
+  @ApiBearerAuth()
+  @ApiOperation({ summary: '查看我的设备列表' })
+  @ApiResponse({ status: 200, type: [DeviceResponseDto] })
+  async getMyDevices(@CurrentUser() user: CurrentUserData) {
+    return this.userService.getMyDevices(new GetMyDevicesQuery(user.userId, user.deviceId));
+  }
+
+  @Post('remove-device')
+  @ApiBearerAuth()
+  @ApiOperation({ summary: '移除设备' })
+  async removeDevice(@CurrentUser() user: CurrentUserData, @Body() dto: RemoveDeviceDto) {
+    await this.userService.removeDevice(
+      new RemoveDeviceCommand(user.userId, user.deviceId, dto.deviceId),
+    );
+    return { message: '移除成功' };
+  }
+
+  @Public()
+  @Get('by-referral-code/:code')
+  @ApiOperation({ summary: '根据推荐码查询用户' })
+  async getByReferralCode(@Param('code') code: string) {
+    return this.userService.getUserByReferralCode(new GetUserByReferralCodeQuery(code));
+  }
+}
--- a/backend/services/identity-service/identity-service/src/api/dto/index.ts
+++ b/backend/services/identity-service/identity-service/src/api/dto/index.ts
@ -0,0 +1,182 @@
+// Request DTOs
+export * from './request';
+
+// Response DTOs
+export * from './response';
+
+// 其他通用DTOs
+import { IsString, IsOptional, IsNotEmpty, Matches, IsEnum, IsNumber } from 'class-validator';
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+
+export class AutoLoginDto {
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  refreshToken: string;
+
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  deviceId: string;
+}
+
+export class SendSmsCodeDto {
+  @ApiProperty({ example: '13800138000' })
+  @IsString()
+  @Matches(/^1[3-9]\d{9}$/, { message: '手机号格式错误' })
+  phoneNumber: string;
+
+  @ApiProperty({ enum: ['REGISTER', 'LOGIN', 'BIND', 'RECOVER'] })
+  @IsEnum(['REGISTER', 'LOGIN', 'BIND', 'RECOVER'])
+  type: 'REGISTER' | 'LOGIN' | 'BIND' | 'RECOVER';
+}
+
+export class RegisterDto {
+  @ApiProperty({ example: '13800138000' })
+  @IsString()
+  @Matches(/^1[3-9]\d{9}$/, { message: '手机号格式错误' })
+  phoneNumber: string;
+
+  @ApiProperty({ example: '123456' })
+  @IsString()
+  @Matches(/^\d{6}$/, { message: '验证码格式错误' })
+  smsCode: string;
+
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  deviceId: string;
+
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  provinceCode: string;
+
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  cityCode: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  deviceName?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  inviterReferralCode?: string;
+}
+
+export class LoginDto {
+  @ApiProperty({ example: '13800138000' })
+  @IsString()
+  @Matches(/^1[3-9]\d{9}$/, { message: '手机号格式错误' })
+  phoneNumber: string;
+
+  @ApiProperty({ example: '123456' })
+  @IsString()
+  @Matches(/^\d{6}$/, { message: '验证码格式错误' })
+  smsCode: string;
+
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  deviceId: string;
+}
+
+export class UpdateProfileDto {
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  nickname?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  avatarUrl?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  address?: string;
+}
+
+export class BindWalletDto {
+  @ApiProperty({ enum: ['KAVA', 'DST', 'BSC'] })
+  @IsEnum(['KAVA', 'DST', 'BSC'])
+  chainType: string;
+
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  address: string;
+}
+
+export class RemoveDeviceDto {
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  deviceId: string;
+}
+
+// Response DTOs
+export class AutoCreateAccountResponseDto {
+  @ApiProperty()
+  userId: string;
+
+  @ApiProperty()
+  accountSequence: number;
+
+  @ApiProperty()
+  referralCode: string;
+
+  @ApiProperty({ description: '助记词(仅返回一次,请妥善保管)' })
+  mnemonic: string;
+
+  @ApiProperty()
+  walletAddresses: { kava: string; dst: string; bsc: string };
+
+  @ApiProperty()
+  accessToken: string;
+
+  @ApiProperty()
+  refreshToken: string;
+}
+
+export class RecoverAccountResponseDto {
+  @ApiProperty()
+  userId: string;
+
+  @ApiProperty()
+  accountSequence: number;
+
+  @ApiProperty()
+  nickname: string;
+
+  @ApiProperty({ nullable: true })
+  avatarUrl: string | null;
+
+  @ApiProperty()
+  referralCode: string;
+
+  @ApiProperty()
+  accessToken: string;
+
+  @ApiProperty()
+  refreshToken: string;
+}
+
+export class LoginResponseDto {
+  @ApiProperty()
+  userId: string;
+
+  @ApiProperty()
+  accountSequence: number;
+
+  @ApiProperty()
+  accessToken: string;
+
+  @ApiProperty()
+  refreshToken: string;
+}
--- a/backend/services/identity-service/identity-service/src/api/dto/request/auto-create-account.dto.ts
+++ b/backend/services/identity-service/identity-service/src/api/dto/request/auto-create-account.dto.ts
@ -0,0 +1,30 @@
+import { IsString, IsOptional, IsNotEmpty, Matches } from 'class-validator';
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+
+export class AutoCreateAccountDto {
+  @ApiProperty({ example: '550e8400-e29b-41d4-a716-446655440000' })
+  @IsString()
+  @IsNotEmpty()
+  deviceId: string;
+
+  @ApiPropertyOptional({ example: 'iPhone 15 Pro' })
+  @IsOptional()
+  @IsString()
+  deviceName?: string;
+
+  @ApiPropertyOptional({ example: 'ABC123' })
+  @IsOptional()
+  @IsString()
+  @Matches(/^[A-Z0-9]{6}$/, { message: '推荐码格式错误' })
+  inviterReferralCode?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  provinceCode?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  cityCode?: string;
+}
--- a/backend/services/identity-service/identity-service/src/api/dto/request/bind-phone.dto.ts
+++ b/backend/services/identity-service/identity-service/src/api/dto/request/bind-phone.dto.ts
@ -0,0 +1,14 @@
+import { IsString, Matches } from 'class-validator';
+import { ApiProperty } from '@nestjs/swagger';
+
+export class BindPhoneDto {
+  @ApiProperty({ example: '13800138000' })
+  @IsString()
+  @Matches(/^1[3-9]\d{9}$/, { message: '手机号格式错误' })
+  phoneNumber: string;
+
+  @ApiProperty({ example: '123456' })
+  @IsString()
+  @Matches(/^\d{6}$/, { message: '验证码格式错误' })
+  smsCode: string;
+}
--- a/backend/services/identity-service/identity-service/src/api/dto/request/index.ts
+++ b/backend/services/identity-service/identity-service/src/api/dto/request/index.ts
@ -0,0 +1,5 @@
+export * from './auto-create-account.dto';
+export * from './recover-by-mnemonic.dto';
+export * from './recover-by-phone.dto';
+export * from './bind-phone.dto';
+export * from './submit-kyc.dto';
--- a/backend/services/identity-service/identity-service/src/api/dto/request/recover-by-mnemonic.dto.ts
+++ b/backend/services/identity-service/identity-service/src/api/dto/request/recover-by-mnemonic.dto.ts
@ -0,0 +1,23 @@
+import { IsString, IsOptional, IsNotEmpty, IsNumber } from 'class-validator';
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+
+export class RecoverByMnemonicDto {
+  @ApiProperty({ example: 10001 })
+  @IsNumber()
+  accountSequence: number;
+
+  @ApiProperty({ example: 'abandon ability able about above absent absorb abstract absurd abuse access accident' })
+  @IsString()
+  @IsNotEmpty()
+  mnemonic: string;
+
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  newDeviceId: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  deviceName?: string;
+}
--- a/backend/services/identity-service/identity-service/src/api/dto/request/recover-by-phone.dto.ts
+++ b/backend/services/identity-service/identity-service/src/api/dto/request/recover-by-phone.dto.ts
@ -0,0 +1,28 @@
+import { IsString, IsOptional, IsNotEmpty, IsNumber, Matches } from 'class-validator';
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+
+export class RecoverByPhoneDto {
+  @ApiProperty({ example: 10001 })
+  @IsNumber()
+  accountSequence: number;
+
+  @ApiProperty({ example: '13800138000' })
+  @IsString()
+  @Matches(/^1[3-9]\d{9}$/, { message: '手机号格式错误' })
+  phoneNumber: string;
+
+  @ApiProperty({ example: '123456' })
+  @IsString()
+  @Matches(/^\d{6}$/, { message: '验证码格式错误' })
+  smsCode: string;
+
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  newDeviceId: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  deviceName?: string;
+}
--- a/backend/services/identity-service/identity-service/src/api/dto/request/submit-kyc.dto.ts
+++ b/backend/services/identity-service/identity-service/src/api/dto/request/submit-kyc.dto.ts
@ -0,0 +1,24 @@
+import { IsString, IsNotEmpty, Matches } from 'class-validator';
+import { ApiProperty } from '@nestjs/swagger';
+
+export class SubmitKycDto {
+  @ApiProperty({ example: '张三' })
+  @IsString()
+  @IsNotEmpty()
+  realName: string;
+
+  @ApiProperty({ example: '110101199001011234' })
+  @IsString()
+  @Matches(/^[1-9]\d{5}(18|19|20)\d{2}(0[1-9]|1[0-2])(0[1-9]|[12]\d|3[01])\d{3}[0-9Xx]$/, { message: '身份证号格式错误' })
+  idCardNumber: string;
+
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  idCardFrontUrl: string;
+
+  @ApiProperty()
+  @IsString()
+  @IsNotEmpty()
+  idCardBackUrl: string;
+}
--- a/backend/services/identity-service/identity-service/src/api/dto/response/device.dto.ts
+++ b/backend/services/identity-service/identity-service/src/api/dto/response/device.dto.ts
@ -0,0 +1,18 @@
+import { ApiProperty } from '@nestjs/swagger';
+
+export class DeviceDto {
+  @ApiProperty()
+  deviceId: string;
+
+  @ApiProperty()
+  deviceName: string;
+
+  @ApiProperty()
+  addedAt: Date;
+
+  @ApiProperty()
+  lastActiveAt: Date;
+
+  @ApiProperty()
+  isCurrent: boolean;
+}
--- a/backend/services/identity-service/identity-service/src/api/dto/response/index.ts
+++ b/backend/services/identity-service/identity-service/src/api/dto/response/index.ts
@ -0,0 +1,2 @@
+export * from './user-profile.dto';
+export * from './device.dto';
--- a/backend/services/identity-service/identity-service/src/api/dto/response/user-profile.dto.ts
+++ b/backend/services/identity-service/identity-service/src/api/dto/response/user-profile.dto.ts
@ -0,0 +1,64 @@
+import { ApiProperty } from '@nestjs/swagger';
+
+export class WalletAddressDto {
+  @ApiProperty()
+  chainType: string;
+
+  @ApiProperty()
+  address: string;
+}
+
+export class KycInfoDto {
+  @ApiProperty()
+  realName: string;
+
+  @ApiProperty()
+  idCardNumber: string;
+}
+
+export class UserProfileDto {
+  @ApiProperty()
+  userId: string;
+
+  @ApiProperty()
+  accountSequence: number;
+
+  @ApiProperty({ nullable: true })
+  phoneNumber: string | null;
+
+  @ApiProperty()
+  nickname: string;
+
+  @ApiProperty({ nullable: true })
+  avatarUrl: string | null;
+
+  @ApiProperty()
+  referralCode: string;
+
+  @ApiProperty()
+  province: string;
+
+  @ApiProperty()
+  city: string;
+
+  @ApiProperty({ nullable: true })
+  address: string | null;
+
+  @ApiProperty({ type: [WalletAddressDto] })
+  walletAddresses: WalletAddressDto[];
+
+  @ApiProperty()
+  kycStatus: string;
+
+  @ApiProperty({ type: KycInfoDto, nullable: true })
+  kycInfo: KycInfoDto | null;
+
+  @ApiProperty()
+  status: string;
+
+  @ApiProperty()
+  registeredAt: Date;
+
+  @ApiProperty({ nullable: true })
+  lastLoginAt: Date | null;
+}
--- a/backend/services/identity-service/identity-service/src/api/validators/phone.validator.ts
+++ b/backend/services/identity-service/identity-service/src/api/validators/phone.validator.ts
@ -0,0 +1,47 @@
+import { ValidatorConstraint, ValidatorConstraintInterface, ValidationArguments, registerDecorator, ValidationOptions } from 'class-validator';
+
+@ValidatorConstraint({ name: 'isChinesePhone', async: false })
+export class IsChinesePhoneConstraint implements ValidatorConstraintInterface {
+  validate(phone: string, args: ValidationArguments): boolean {
+    return /^1[3-9]\d{9}$/.test(phone);
+  }
+
+  defaultMessage(args: ValidationArguments): string {
+    return '手机号格式错误';
+  }
+}
+
+export function IsChinesePhone(validationOptions?: ValidationOptions) {
+  return function (object: Object, propertyName: string) {
+    registerDecorator({
+      target: object.constructor,
+      propertyName: propertyName,
+      options: validationOptions,
+      constraints: [],
+      validator: IsChinesePhoneConstraint,
+    });
+  };
+}
+
+@ValidatorConstraint({ name: 'isChineseIdCard', async: false })
+export class IsChineseIdCardConstraint implements ValidatorConstraintInterface {
+  validate(idCard: string, args: ValidationArguments): boolean {
+    return /^[1-9]\d{5}(18|19|20)\d{2}(0[1-9]|1[0-2])(0[1-9]|[12]\d|3[01])\d{3}[0-9Xx]$/.test(idCard);
+  }
+
+  defaultMessage(args: ValidationArguments): string {
+    return '身份证号格式错误';
+  }
+}
+
+export function IsChineseIdCard(validationOptions?: ValidationOptions) {
+  return function (object: Object, propertyName: string) {
+    registerDecorator({
+      target: object.constructor,
+      propertyName: propertyName,
+      options: validationOptions,
+      constraints: [],
+      validator: IsChineseIdCardConstraint,
+    });
+  };
+}
--- a/backend/services/identity-service/identity-service/src/app.module.ts
+++ b/backend/services/identity-service/identity-service/src/app.module.ts
@ -0,0 +1,100 @@
+import { Module, Global } from '@nestjs/common';
+import { ConfigModule, ConfigService } from '@nestjs/config';
+import { JwtModule } from '@nestjs/jwt';
+import { APP_FILTER, APP_INTERCEPTOR, APP_GUARD } from '@nestjs/core';
+
+// Config
+import { appConfig, databaseConfig, jwtConfig, redisConfig, kafkaConfig, smsConfig, walletConfig } from '@/config';
+
+// Controllers
+import { UserAccountController } from '@/api/controllers/user-account.controller';
+
+// Application Services
+import { UserApplicationService } from '@/application/services/user-application.service';
+import { TokenService } from '@/application/services/token.service';
+
+// Domain Services
+import {
+  AccountSequenceGeneratorService, UserValidatorService, WalletGeneratorService,
+} from '@/domain/services';
+import { USER_ACCOUNT_REPOSITORY } from '@/domain/repositories/user-account.repository.interface';
+
+// Infrastructure
+import { PrismaService } from '@/infrastructure/persistence/prisma/prisma.service';
+import { UserAccountRepositoryImpl } from '@/infrastructure/persistence/repositories/user-account.repository.impl';
+import { RedisService } from '@/infrastructure/redis/redis.service';
+import { EventPublisherService } from '@/infrastructure/kafka/event-publisher.service';
+import { SmsService } from '@/infrastructure/external/sms/sms.service';
+
+// Shared
+import { GlobalExceptionFilter, TransformInterceptor } from '@/shared/filters/global-exception.filter';
+import { JwtAuthGuard } from '@/shared/guards/jwt-auth.guard';
+
+// ============ Infrastructure Module ============
+@Global()
+@Module({
+  providers: [PrismaService, RedisService, EventPublisherService, SmsService],
+  exports: [PrismaService, RedisService, EventPublisherService, SmsService],
+})
+export class InfrastructureModule {}
+
+// ============ Domain Module ============
+@Module({
+  imports: [InfrastructureModule],
+  providers: [
+    { provide: USER_ACCOUNT_REPOSITORY, useClass: UserAccountRepositoryImpl },
+    AccountSequenceGeneratorService,
+    UserValidatorService,
+    WalletGeneratorService,
+  ],
+  exports: [
+    USER_ACCOUNT_REPOSITORY,
+    AccountSequenceGeneratorService,
+    UserValidatorService,
+    WalletGeneratorService,
+  ],
+})
+export class DomainModule {}
+
+// ============ Application Module ============
+@Module({
+  imports: [DomainModule, InfrastructureModule],
+  providers: [UserApplicationService, TokenService],
+  exports: [UserApplicationService, TokenService],
+})
+export class ApplicationModule {}
+
+// ============ API Module ============
+@Module({
+  imports: [ApplicationModule],
+  controllers: [UserAccountController],
+})
+export class ApiModule {}
+
+// ============ App Module ============
+@Module({
+  imports: [
+    ConfigModule.forRoot({
+      isGlobal: true,
+      load: [appConfig, databaseConfig, jwtConfig, redisConfig, kafkaConfig, smsConfig, walletConfig],
+    }),
+    JwtModule.registerAsync({
+      global: true,
+      inject: [ConfigService],
+      useFactory: (configService: ConfigService) => ({
+        secret: configService.get<string>('JWT_SECRET'),
+        signOptions: { expiresIn: configService.get<string>('JWT_ACCESS_EXPIRES_IN', '2h') },
+      }),
+    }),
+    InfrastructureModule,
+    DomainModule,
+    ApplicationModule,
+    ApiModule,
+  ],
+  providers: [
+    { provide: APP_FILTER, useClass: GlobalExceptionFilter },
+    { provide: APP_INTERCEPTOR, useClass: TransformInterceptor },
+    { provide: APP_GUARD, useClass: JwtAuthGuard },
+  ],
+})
+export class AppModule {}
--- a/backend/services/identity-service/identity-service/src/application/application.module.ts
+++ b/backend/services/identity-service/identity-service/src/application/application.module.ts
@ -0,0 +1,36 @@
+import { Module } from '@nestjs/common';
+import { UserApplicationService } from './services/user-application.service';
+import { TokenService } from './services/token.service';
+import { AutoCreateAccountHandler } from './commands/auto-create-account/auto-create-account.handler';
+import { RecoverByMnemonicHandler } from './commands/recover-by-mnemonic/recover-by-mnemonic.handler';
+import { RecoverByPhoneHandler } from './commands/recover-by-phone/recover-by-phone.handler';
+import { BindPhoneHandler } from './commands/bind-phone/bind-phone.handler';
+import { GetMyProfileHandler } from './queries/get-my-profile/get-my-profile.handler';
+import { GetMyDevicesHandler } from './queries/get-my-devices/get-my-devices.handler';
+import { DomainModule } from '@/domain/domain.module';
+import { InfrastructureModule } from '@/infrastructure/infrastructure.module';
+
+@Module({
+  imports: [DomainModule, InfrastructureModule],
+  providers: [
+    UserApplicationService,
+    TokenService,
+    AutoCreateAccountHandler,
+    RecoverByMnemonicHandler,
+    RecoverByPhoneHandler,
+    BindPhoneHandler,
+    GetMyProfileHandler,
+    GetMyDevicesHandler,
+  ],
+  exports: [
+    UserApplicationService,
+    TokenService,
+    AutoCreateAccountHandler,
+    RecoverByMnemonicHandler,
+    RecoverByPhoneHandler,
+    BindPhoneHandler,
+    GetMyProfileHandler,
+    GetMyDevicesHandler,
+  ],
+})
+export class ApplicationModule {}
--- a/backend/services/identity-service/identity-service/src/application/commands/auto-create-account/auto-create-account.command.ts
+++ b/backend/services/identity-service/identity-service/src/application/commands/auto-create-account/auto-create-account.command.ts
@ -0,0 +1,9 @@
+export class AutoCreateAccountCommand {
+  constructor(
+    public readonly deviceId: string,
+    public readonly deviceName?: string,
+    public readonly inviterReferralCode?: string,
+    public readonly provinceCode?: string,
+    public readonly cityCode?: string,
+  ) {}
+}
--- a/backend/services/identity-service/identity-service/src/application/commands/auto-create-account/auto-create-account.handler.ts
+++ b/backend/services/identity-service/identity-service/src/application/commands/auto-create-account/auto-create-account.handler.ts
@ -0,0 +1,80 @@
+import { Injectable, Inject } from '@nestjs/common';
+import { AutoCreateAccountCommand } from './auto-create-account.command';
+import { UserAccountRepository, USER_ACCOUNT_REPOSITORY } from '@/domain/repositories/user-account.repository.interface';
+import { UserAccount } from '@/domain/aggregates/user-account/user-account.aggregate';
+import { AccountSequenceGeneratorService, UserValidatorService, WalletGeneratorService } from '@/domain/services';
+import { ReferralCode, AccountSequence, ProvinceCode, CityCode, ChainType } from '@/domain/value-objects';
+import { TokenService } from '@/application/services/token.service';
+import { EventPublisherService } from '@/infrastructure/kafka/event-publisher.service';
+import { ApplicationError } from '@/shared/exceptions/domain.exception';
+import { AutoCreateAccountResult } from '../index';
+
+@Injectable()
+export class AutoCreateAccountHandler {
+  constructor(
+    @Inject(USER_ACCOUNT_REPOSITORY)
+    private readonly userRepository: UserAccountRepository,
+    private readonly sequenceGenerator: AccountSequenceGeneratorService,
+    private readonly validatorService: UserValidatorService,
+    private readonly walletGenerator: WalletGeneratorService,
+    private readonly tokenService: TokenService,
+    private readonly eventPublisher: EventPublisherService,
+  ) {}
+
+  async execute(command: AutoCreateAccountCommand): Promise<AutoCreateAccountResult> {
+    const deviceValidation = await this.validatorService.validateDeviceId(command.deviceId);
+    if (!deviceValidation.isValid) throw new ApplicationError(deviceValidation.errorMessage!);
+
+    let inviterSequence: AccountSequence | null = null;
+    if (command.inviterReferralCode) {
+      const referralCode = ReferralCode.create(command.inviterReferralCode);
+      const referralValidation = await this.validatorService.validateReferralCode(referralCode);
+      if (!referralValidation.isValid) throw new ApplicationError(referralValidation.errorMessage!);
+      const inviter = await this.userRepository.findByReferralCode(referralCode);
+      inviterSequence = inviter!.accountSequence;
+    }
+
+    const accountSequence = await this.sequenceGenerator.generateNext();
+
+    const account = UserAccount.createAutomatic({
+      accountSequence,
+      initialDeviceId: command.deviceId,
+      deviceName: command.deviceName,
+      inviterSequence,
+      province: ProvinceCode.create(command.provinceCode || 'DEFAULT'),
+      city: CityCode.create(command.cityCode || 'DEFAULT'),
+    });
+
+    const { mnemonic, wallets } = this.walletGenerator.generateWalletSystem({
+      userId: account.userId,
+      deviceId: command.deviceId,
+    });
+
+    account.bindMultipleWalletAddresses(wallets);
+    await this.userRepository.save(account);
+    await this.userRepository.saveWallets(account.userId, Array.from(wallets.values()));
+
+    const tokens = await this.tokenService.generateTokenPair({
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      deviceId: command.deviceId,
+    });
+
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      referralCode: account.referralCode.value,
+      mnemonic: mnemonic.value,
+      walletAddresses: {
+        kava: wallets.get(ChainType.KAVA)!.address,
+        dst: wallets.get(ChainType.DST)!.address,
+        bsc: wallets.get(ChainType.BSC)!.address,
+      },
+      accessToken: tokens.accessToken,
+      refreshToken: tokens.refreshToken,
+    };
+  }
+}
--- a/backend/services/identity-service/identity-service/src/application/commands/bind-phone/bind-phone.command.ts
+++ b/backend/services/identity-service/identity-service/src/application/commands/bind-phone/bind-phone.command.ts
@ -0,0 +1,7 @@
+export class BindPhoneCommand {
+  constructor(
+    public readonly userId: string,
+    public readonly phoneNumber: string,
+    public readonly smsCode: string,
+  ) {}
+}
--- a/backend/services/identity-service/identity-service/src/application/commands/bind-phone/bind-phone.handler.ts
+++ b/backend/services/identity-service/identity-service/src/application/commands/bind-phone/bind-phone.handler.ts
@ -0,0 +1,37 @@
+import { Injectable, Inject } from '@nestjs/common';
+import { BindPhoneCommand } from './bind-phone.command';
+import { UserAccountRepository, USER_ACCOUNT_REPOSITORY } from '@/domain/repositories/user-account.repository.interface';
+import { UserValidatorService } from '@/domain/services';
+import { UserId, PhoneNumber } from '@/domain/value-objects';
+import { RedisService } from '@/infrastructure/redis/redis.service';
+import { EventPublisherService } from '@/infrastructure/kafka/event-publisher.service';
+import { ApplicationError } from '@/shared/exceptions/domain.exception';
+
+@Injectable()
+export class BindPhoneHandler {
+  constructor(
+    @Inject(USER_ACCOUNT_REPOSITORY)
+    private readonly userRepository: UserAccountRepository,
+    private readonly validatorService: UserValidatorService,
+    private readonly redisService: RedisService,
+    private readonly eventPublisher: EventPublisherService,
+  ) {}
+
+  async execute(command: BindPhoneCommand): Promise<void> {
+    const account = await this.userRepository.findById(UserId.create(command.userId));
+    if (!account) throw new ApplicationError('用户不存在');
+
+    const phoneNumber = PhoneNumber.create(command.phoneNumber);
+    const cachedCode = await this.redisService.get(`sms:bind:${phoneNumber.value}`);
+    if (cachedCode !== command.smsCode) throw new ApplicationError('验证码错误或已过期');
+
+    const validation = await this.validatorService.validatePhoneNumber(phoneNumber);
+    if (!validation.isValid) throw new ApplicationError(validation.errorMessage!);
+
+    account.bindPhoneNumber(phoneNumber);
+    await this.userRepository.save(account);
+    await this.redisService.delete(`sms:bind:${phoneNumber.value}`);
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+  }
+}
--- a/backend/services/identity-service/identity-service/src/application/commands/index.ts
+++ b/backend/services/identity-service/identity-service/src/application/commands/index.ts
@ -0,0 +1,206 @@
+// ============ Commands ============
+export class AutoCreateAccountCommand {
+  constructor(
+    public readonly deviceId: string,
+    public readonly deviceName?: string,
+    public readonly inviterReferralCode?: string,
+    public readonly provinceCode?: string,
+    public readonly cityCode?: string,
+  ) {}
+}
+
+export class RecoverByMnemonicCommand {
+  constructor(
+    public readonly accountSequence: number,
+    public readonly mnemonic: string,
+    public readonly newDeviceId: string,
+    public readonly deviceName?: string,
+  ) {}
+}
+
+export class RecoverByPhoneCommand {
+  constructor(
+    public readonly accountSequence: number,
+    public readonly phoneNumber: string,
+    public readonly smsCode: string,
+    public readonly newDeviceId: string,
+    public readonly deviceName?: string,
+  ) {}
+}
+
+export class AutoLoginCommand {
+  constructor(
+    public readonly refreshToken: string,
+    public readonly deviceId: string,
+  ) {}
+}
+
+export class RegisterCommand {
+  constructor(
+    public readonly phoneNumber: string,
+    public readonly smsCode: string,
+    public readonly deviceId: string,
+    public readonly provinceCode: string,
+    public readonly cityCode: string,
+    public readonly deviceName?: string,
+    public readonly inviterReferralCode?: string,
+  ) {}
+}
+
+export class LoginCommand {
+  constructor(
+    public readonly phoneNumber: string,
+    public readonly smsCode: string,
+    public readonly deviceId: string,
+  ) {}
+}
+
+export class BindPhoneNumberCommand {
+  constructor(
+    public readonly userId: string,
+    public readonly phoneNumber: string,
+    public readonly smsCode: string,
+  ) {}
+}
+
+export class UpdateProfileCommand {
+  constructor(
+    public readonly userId: string,
+    public readonly nickname?: string,
+    public readonly avatarUrl?: string,
+    public readonly address?: string,
+  ) {}
+}
+
+export class BindWalletAddressCommand {
+  constructor(
+    public readonly userId: string,
+    public readonly chainType: string,
+    public readonly address: string,
+  ) {}
+}
+
+export class SubmitKYCCommand {
+  constructor(
+    public readonly userId: string,
+    public readonly realName: string,
+    public readonly idCardNumber: string,
+    public readonly idCardFrontUrl: string,
+    public readonly idCardBackUrl: string,
+  ) {}
+}
+
+export class ReviewKYCCommand {
+  constructor(
+    public readonly userId: string,
+    public readonly approved: boolean,
+    public readonly reason?: string,
+  ) {}
+}
+
+export class RemoveDeviceCommand {
+  constructor(
+    public readonly userId: string,
+    public readonly currentDeviceId: string,
+    public readonly deviceIdToRemove: string,
+  ) {}
+}
+
+export class SendSmsCodeCommand {
+  constructor(
+    public readonly phoneNumber: string,
+    public readonly type: 'REGISTER' | 'LOGIN' | 'BIND' | 'RECOVER',
+  ) {}
+}
+
+// ============ Queries ============
+export class GetMyProfileQuery {
+  constructor(public readonly userId: string) {}
+}
+
+export class GetMyDevicesQuery {
+  constructor(
+    public readonly userId: string,
+    public readonly currentDeviceId: string,
+  ) {}
+}
+
+export class GetUserByReferralCodeQuery {
+  constructor(public readonly referralCode: string) {}
+}
+
+// ============ Results ============
+export interface AutoCreateAccountResult {
+  userId: string;
+  accountSequence: number;
+  referralCode: string;
+  mnemonic: string;
+  walletAddresses: { kava: string; dst: string; bsc: string };
+  accessToken: string;
+  refreshToken: string;
+}
+
+export interface RecoverAccountResult {
+  userId: string;
+  accountSequence: number;
+  nickname: string;
+  avatarUrl: string | null;
+  referralCode: string;
+  accessToken: string;
+  refreshToken: string;
+}
+
+export interface AutoLoginResult {
+  userId: string;
+  accountSequence: number;
+  accessToken: string;
+  refreshToken: string;
+}
+
+export interface RegisterResult {
+  userId: string;
+  accountSequence: number;
+  referralCode: string;
+  accessToken: string;
+  refreshToken: string;
+}
+
+export interface LoginResult {
+  userId: string;
+  accountSequence: number;
+  accessToken: string;
+  refreshToken: string;
+}
+
+export interface UserProfileDTO {
+  userId: string;
+  accountSequence: number;
+  phoneNumber: string | null;
+  nickname: string;
+  avatarUrl: string | null;
+  referralCode: string;
+  province: string;
+  city: string;
+  address: string | null;
+  walletAddresses: Array<{ chainType: string; address: string }>;
+  kycStatus: string;
+  kycInfo: { realName: string; idCardNumber: string } | null;
+  status: string;
+  registeredAt: Date;
+  lastLoginAt: Date | null;
+}
+
+export interface DeviceDTO {
+  deviceId: string;
+  deviceName: string;
+  addedAt: Date;
+  lastActiveAt: Date;
+  isCurrent: boolean;
+}
+
+export interface UserBriefDTO {
+  userId: string;
+  accountSequence: number;
+  nickname: string;
+  avatarUrl: string | null;
+}
--- a/backend/services/identity-service/identity-service/src/application/commands/recover-by-mnemonic/recover-by-mnemonic.command.ts
+++ b/backend/services/identity-service/identity-service/src/application/commands/recover-by-mnemonic/recover-by-mnemonic.command.ts
@ -0,0 +1,8 @@
+export class RecoverByMnemonicCommand {
+  constructor(
+    public readonly accountSequence: number,
+    public readonly mnemonic: string,
+    public readonly newDeviceId: string,
+    public readonly deviceName?: string,
+  ) {}
+}
--- a/backend/services/identity-service/identity-service/src/application/commands/recover-by-mnemonic/recover-by-mnemonic.handler.ts
+++ b/backend/services/identity-service/identity-service/src/application/commands/recover-by-mnemonic/recover-by-mnemonic.handler.ts
@ -0,0 +1,62 @@
+import { Injectable, Inject } from '@nestjs/common';
+import { RecoverByMnemonicCommand } from './recover-by-mnemonic.command';
+import { UserAccountRepository, USER_ACCOUNT_REPOSITORY } from '@/domain/repositories/user-account.repository.interface';
+import { WalletGeneratorService } from '@/domain/services';
+import { AccountSequence, ChainType, Mnemonic } from '@/domain/value-objects';
+import { TokenService } from '@/application/services/token.service';
+import { EventPublisherService } from '@/infrastructure/kafka/event-publisher.service';
+import { ApplicationError } from '@/shared/exceptions/domain.exception';
+import { RecoverAccountResult } from '../index';
+
+@Injectable()
+export class RecoverByMnemonicHandler {
+  constructor(
+    @Inject(USER_ACCOUNT_REPOSITORY)
+    private readonly userRepository: UserAccountRepository,
+    private readonly walletGenerator: WalletGeneratorService,
+    private readonly tokenService: TokenService,
+    private readonly eventPublisher: EventPublisherService,
+  ) {}
+
+  async execute(command: RecoverByMnemonicCommand): Promise<RecoverAccountResult> {
+    const accountSequence = AccountSequence.create(command.accountSequence);
+    const account = await this.userRepository.findByAccountSequence(accountSequence);
+    if (!account) throw new ApplicationError('账户序列号不存在');
+    if (!account.isActive) throw new ApplicationError('账户已冻结或注销');
+
+    const mnemonic = Mnemonic.create(command.mnemonic);
+    const wallets = this.walletGenerator.recoverWalletSystem({
+      userId: account.userId,
+      mnemonic,
+      deviceId: command.newDeviceId,
+    });
+
+    const kavaWallet = account.getWalletAddress(ChainType.KAVA);
+    if (!kavaWallet || kavaWallet.address !== wallets.get(ChainType.KAVA)!.address) {
+      throw new ApplicationError('助记词错误');
+    }
+
+    account.addDevice(command.newDeviceId, command.deviceName);
+    account.recordLogin();
+    await this.userRepository.save(account);
+
+    const tokens = await this.tokenService.generateTokenPair({
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      deviceId: command.newDeviceId,
+    });
+
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      nickname: account.nickname,
+      avatarUrl: account.avatarUrl,
+      referralCode: account.referralCode.value,
+      accessToken: tokens.accessToken,
+      refreshToken: tokens.refreshToken,
+    };
+  }
+}
--- a/backend/services/identity-service/identity-service/src/application/commands/recover-by-phone/recover-by-phone.command.ts
+++ b/backend/services/identity-service/identity-service/src/application/commands/recover-by-phone/recover-by-phone.command.ts
@ -0,0 +1,9 @@
+export class RecoverByPhoneCommand {
+  constructor(
+    public readonly accountSequence: number,
+    public readonly phoneNumber: string,
+    public readonly smsCode: string,
+    public readonly newDeviceId: string,
+    public readonly deviceName?: string,
+  ) {}
+}
--- a/backend/services/identity-service/identity-service/src/application/commands/recover-by-phone/recover-by-phone.handler.ts
+++ b/backend/services/identity-service/identity-service/src/application/commands/recover-by-phone/recover-by-phone.handler.ts
@ -0,0 +1,58 @@
+import { Injectable, Inject } from '@nestjs/common';
+import { RecoverByPhoneCommand } from './recover-by-phone.command';
+import { UserAccountRepository, USER_ACCOUNT_REPOSITORY } from '@/domain/repositories/user-account.repository.interface';
+import { AccountSequence, PhoneNumber } from '@/domain/value-objects';
+import { TokenService } from '@/application/services/token.service';
+import { RedisService } from '@/infrastructure/redis/redis.service';
+import { EventPublisherService } from '@/infrastructure/kafka/event-publisher.service';
+import { ApplicationError } from '@/shared/exceptions/domain.exception';
+import { RecoverAccountResult } from '../index';
+
+@Injectable()
+export class RecoverByPhoneHandler {
+  constructor(
+    @Inject(USER_ACCOUNT_REPOSITORY)
+    private readonly userRepository: UserAccountRepository,
+    private readonly tokenService: TokenService,
+    private readonly redisService: RedisService,
+    private readonly eventPublisher: EventPublisherService,
+  ) {}
+
+  async execute(command: RecoverByPhoneCommand): Promise<RecoverAccountResult> {
+    const accountSequence = AccountSequence.create(command.accountSequence);
+    const account = await this.userRepository.findByAccountSequence(accountSequence);
+    if (!account) throw new ApplicationError('账户序列号不存在');
+    if (!account.isActive) throw new ApplicationError('账户已冻结或注销');
+    if (!account.phoneNumber) throw new ApplicationError('该账户未绑定手机号，请使用助记词恢复');
+
+    const phoneNumber = PhoneNumber.create(command.phoneNumber);
+    if (!account.phoneNumber.equals(phoneNumber)) throw new ApplicationError('手机号与账户不匹配');
+
+    const cachedCode = await this.redisService.get(`sms:recover:${phoneNumber.value}`);
+    if (cachedCode !== command.smsCode) throw new ApplicationError('验证码错误或已过期');
+
+    account.addDevice(command.newDeviceId, command.deviceName);
+    account.recordLogin();
+    await this.userRepository.save(account);
+    await this.redisService.delete(`sms:recover:${phoneNumber.value}`);
+
+    const tokens = await this.tokenService.generateTokenPair({
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      deviceId: command.newDeviceId,
+    });
+
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      nickname: account.nickname,
+      avatarUrl: account.avatarUrl,
+      referralCode: account.referralCode.value,
+      accessToken: tokens.accessToken,
+      refreshToken: tokens.refreshToken,
+    };
+  }
+}
--- a/backend/services/identity-service/identity-service/src/application/queries/get-my-devices/get-my-devices.handler.ts
+++ b/backend/services/identity-service/identity-service/src/application/queries/get-my-devices/get-my-devices.handler.ts
@ -0,0 +1,27 @@
+import { Injectable, Inject } from '@nestjs/common';
+import { GetMyDevicesQuery } from './get-my-devices.query';
+import { UserAccountRepository, USER_ACCOUNT_REPOSITORY } from '@/domain/repositories/user-account.repository.interface';
+import { UserId } from '@/domain/value-objects';
+import { ApplicationError } from '@/shared/exceptions/domain.exception';
+import { DeviceDTO } from '@/application/commands';
+
+@Injectable()
+export class GetMyDevicesHandler {
+  constructor(
+    @Inject(USER_ACCOUNT_REPOSITORY)
+    private readonly userRepository: UserAccountRepository,
+  ) {}
+
+  async execute(query: GetMyDevicesQuery): Promise<DeviceDTO[]> {
+    const account = await this.userRepository.findById(UserId.create(query.userId));
+    if (!account) throw new ApplicationError('用户不存在');
+
+    return account.getAllDevices().map((device) => ({
+      deviceId: device.deviceId,
+      deviceName: device.deviceName,
+      addedAt: device.addedAt,
+      lastActiveAt: device.lastActiveAt,
+      isCurrent: device.deviceId === query.currentDeviceId,
+    }));
+  }
+}
--- a/backend/services/identity-service/identity-service/src/application/queries/get-my-devices/get-my-devices.query.ts
+++ b/backend/services/identity-service/identity-service/src/application/queries/get-my-devices/get-my-devices.query.ts
@ -0,0 +1,6 @@
+export class GetMyDevicesQuery {
+  constructor(
+    public readonly userId: string,
+    public readonly currentDeviceId: string,
+  ) {}
+}
--- a/backend/services/identity-service/identity-service/src/application/queries/get-my-profile/get-my-profile.handler.ts
+++ b/backend/services/identity-service/identity-service/src/application/queries/get-my-profile/get-my-profile.handler.ts
@ -0,0 +1,46 @@
+import { Injectable, Inject } from '@nestjs/common';
+import { GetMyProfileQuery } from './get-my-profile.query';
+import { UserAccountRepository, USER_ACCOUNT_REPOSITORY } from '@/domain/repositories/user-account.repository.interface';
+import { UserAccount } from '@/domain/aggregates/user-account/user-account.aggregate';
+import { UserId } from '@/domain/value-objects';
+import { ApplicationError } from '@/shared/exceptions/domain.exception';
+import { UserProfileDTO } from '@/application/commands';
+
+@Injectable()
+export class GetMyProfileHandler {
+  constructor(
+    @Inject(USER_ACCOUNT_REPOSITORY)
+    private readonly userRepository: UserAccountRepository,
+  ) {}
+
+  async execute(query: GetMyProfileQuery): Promise<UserProfileDTO> {
+    const account = await this.userRepository.findById(UserId.create(query.userId));
+    if (!account) throw new ApplicationError('用户不存在');
+    return this.toDTO(account);
+  }
+
+  private toDTO(account: UserAccount): UserProfileDTO {
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      phoneNumber: account.phoneNumber?.masked() || null,
+      nickname: account.nickname,
+      avatarUrl: account.avatarUrl,
+      referralCode: account.referralCode.value,
+      province: account.province.value,
+      city: account.city.value,
+      address: account.addressDetail,
+      walletAddresses: account.getAllWalletAddresses().map((wa) => ({
+        chainType: wa.chainType,
+        address: wa.address,
+      })),
+      kycStatus: account.kycStatus,
+      kycInfo: account.kycInfo
+        ? { realName: account.kycInfo.realName, idCardNumber: account.kycInfo.maskedIdCardNumber() }
+        : null,
+      status: account.status,
+      registeredAt: account.registeredAt,
+      lastLoginAt: account.lastLoginAt,
+    };
+  }
+}
--- a/backend/services/identity-service/identity-service/src/application/queries/get-my-profile/get-my-profile.query.ts
+++ b/backend/services/identity-service/identity-service/src/application/queries/get-my-profile/get-my-profile.query.ts
@ -0,0 +1,3 @@
+export class GetMyProfileQuery {
+  constructor(public readonly userId: string) {}
+}
--- a/backend/services/identity-service/identity-service/src/application/services/token.service.ts
+++ b/backend/services/identity-service/identity-service/src/application/services/token.service.ts
@ -0,0 +1,93 @@
+import { Injectable } from '@nestjs/common';
+import { JwtService } from '@nestjs/jwt';
+import { ConfigService } from '@nestjs/config';
+import { createHash } from 'crypto';
+import { PrismaService } from '@/infrastructure/persistence/prisma/prisma.service';
+import { ApplicationError } from '@/shared/exceptions/domain.exception';
+
+export interface TokenPayload {
+  userId: string;
+  accountSequence: number;
+  deviceId: string;
+  type: 'access' | 'refresh';
+}
+
+@Injectable()
+export class TokenService {
+  constructor(
+    private readonly jwtService: JwtService,
+    private readonly configService: ConfigService,
+    private readonly prisma: PrismaService,
+  ) {}
+
+  async generateTokenPair(payload: {
+    userId: string;
+    accountSequence: number;
+    deviceId: string;
+  }): Promise<{ accessToken: string; refreshToken: string }> {
+    const accessToken = this.jwtService.sign(
+      { ...payload, type: 'access' },
+      { expiresIn: this.configService.get<string>('JWT_ACCESS_EXPIRES_IN', '2h') },
+    );
+
+    const refreshToken = this.jwtService.sign(
+      { ...payload, type: 'refresh' },
+      { expiresIn: this.configService.get<string>('JWT_REFRESH_EXPIRES_IN', '30d') },
+    );
+
+    // Save refresh token hash
+    const tokenHash = this.hashToken(refreshToken);
+    await this.prisma.deviceToken.create({
+      data: {
+        userId: BigInt(payload.userId),
+        deviceId: payload.deviceId,
+        refreshTokenHash: tokenHash,
+        expiresAt: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000),
+      },
+    });
+
+    return { accessToken, refreshToken };
+  }
+
+  async verifyRefreshToken(token: string): Promise<{
+    userId: string;
+    accountSequence: number;
+    deviceId: string;
+  }> {
+    try {
+      const payload = this.jwtService.verify<TokenPayload>(token);
+      if (payload.type !== 'refresh') {
+        throw new ApplicationError('无效的RefreshToken');
+      }
+
+      const tokenHash = this.hashToken(token);
+      const storedToken = await this.prisma.deviceToken.findUnique({
+        where: { refreshTokenHash: tokenHash },
+      });
+
+      if (!storedToken || storedToken.revokedAt) {
+        throw new ApplicationError('RefreshToken已失效');
+      }
+
+      return {
+        userId: payload.userId,
+        accountSequence: payload.accountSequence,
+        deviceId: payload.deviceId,
+      };
+    } catch (error) {
+      if (error instanceof ApplicationError) throw error;
+      throw new ApplicationError('RefreshToken已过期或无效');
+    }
+  }
+
+  async revokeDeviceTokens(userId: string, deviceId: string): Promise<void> {
+    await this.prisma.deviceToken.updateMany({
+      where: { userId: BigInt(userId), deviceId, revokedAt: null },
+      data: { revokedAt: new Date() },
+    });
+  }
+
+  private hashToken(token: string): string {
+    return createHash('sha256').update(token).digest('hex');
+  }
+}
--- a/backend/services/identity-service/identity-service/src/application/services/user-application.service.ts
+++ b/backend/services/identity-service/identity-service/src/application/services/user-application.service.ts
@ -0,0 +1,424 @@
+import { Injectable, Inject } from '@nestjs/common';
+import { UserAccountRepository, USER_ACCOUNT_REPOSITORY } from '@/domain/repositories/user-account.repository.interface';
+import { UserAccount } from '@/domain/aggregates/user-account/user-account.aggregate';
+import {
+  AccountSequenceGeneratorService, UserValidatorService, WalletGeneratorService,
+} from '@/domain/services';
+import {
+  UserId, PhoneNumber, ReferralCode, AccountSequence, ProvinceCode, CityCode,
+  ChainType, Mnemonic, KYCInfo,
+} from '@/domain/value-objects';
+import { TokenService } from './token.service';
+import { RedisService } from '@/infrastructure/redis/redis.service';
+import { SmsService } from '@/infrastructure/external/sms/sms.service';
+import { EventPublisherService } from '@/infrastructure/kafka/event-publisher.service';
+import { ApplicationError } from '@/shared/exceptions/domain.exception';
+import {
+  AutoCreateAccountCommand, RecoverByMnemonicCommand, RecoverByPhoneCommand,
+  AutoLoginCommand, RegisterCommand, LoginCommand, BindPhoneNumberCommand,
+  UpdateProfileCommand, SubmitKYCCommand, ReviewKYCCommand, RemoveDeviceCommand,
+  SendSmsCodeCommand, GetMyProfileQuery, GetMyDevicesQuery, GetUserByReferralCodeQuery,
+  AutoCreateAccountResult, RecoverAccountResult, AutoLoginResult, RegisterResult,
+  LoginResult, UserProfileDTO, DeviceDTO, UserBriefDTO,
+} from '../commands';
+
+@Injectable()
+export class UserApplicationService {
+  constructor(
+    @Inject(USER_ACCOUNT_REPOSITORY)
+    private readonly userRepository: UserAccountRepository,
+    private readonly sequenceGenerator: AccountSequenceGeneratorService,
+    private readonly validatorService: UserValidatorService,
+    private readonly walletGenerator: WalletGeneratorService,
+    private readonly tokenService: TokenService,
+    private readonly redisService: RedisService,
+    private readonly smsService: SmsService,
+    private readonly eventPublisher: EventPublisherService,
+  ) {}
+
+  async autoCreateAccount(command: AutoCreateAccountCommand): Promise<AutoCreateAccountResult> {
+    const deviceValidation = await this.validatorService.validateDeviceId(command.deviceId);
+    if (!deviceValidation.isValid) throw new ApplicationError(deviceValidation.errorMessage!);
+
+    let inviterSequence: AccountSequence | null = null;
+    if (command.inviterReferralCode) {
+      const referralCode = ReferralCode.create(command.inviterReferralCode);
+      const referralValidation = await this.validatorService.validateReferralCode(referralCode);
+      if (!referralValidation.isValid) throw new ApplicationError(referralValidation.errorMessage!);
+      const inviter = await this.userRepository.findByReferralCode(referralCode);
+      inviterSequence = inviter!.accountSequence;
+    }
+
+    const accountSequence = await this.sequenceGenerator.generateNext();
+
+    const account = UserAccount.createAutomatic({
+      accountSequence,
+      initialDeviceId: command.deviceId,
+      deviceName: command.deviceName,
+      inviterSequence,
+      province: ProvinceCode.create(command.provinceCode || 'DEFAULT'),
+      city: CityCode.create(command.cityCode || 'DEFAULT'),
+    });
+
+    const { mnemonic, wallets } = this.walletGenerator.generateWalletSystem({
+      userId: account.userId,
+      deviceId: command.deviceId,
+    });
+
+    account.bindMultipleWalletAddresses(wallets);
+    await this.userRepository.save(account);
+    await this.userRepository.saveWallets(account.userId, Array.from(wallets.values()));
+
+    const tokens = await this.tokenService.generateTokenPair({
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      deviceId: command.deviceId,
+    });
+
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      referralCode: account.referralCode.value,
+      mnemonic: mnemonic.value,
+      walletAddresses: {
+        kava: wallets.get(ChainType.KAVA)!.address,
+        dst: wallets.get(ChainType.DST)!.address,
+        bsc: wallets.get(ChainType.BSC)!.address,
+      },
+      accessToken: tokens.accessToken,
+      refreshToken: tokens.refreshToken,
+    };
+  }
+
+  async recoverByMnemonic(command: RecoverByMnemonicCommand): Promise<RecoverAccountResult> {
+    const accountSequence = AccountSequence.create(command.accountSequence);
+    const account = await this.userRepository.findByAccountSequence(accountSequence);
+    if (!account) throw new ApplicationError('账户序列号不存在');
+    if (!account.isActive) throw new ApplicationError('账户已冻结或注销');
+
+    const mnemonic = Mnemonic.create(command.mnemonic);
+    const wallets = this.walletGenerator.recoverWalletSystem({
+      userId: account.userId,
+      mnemonic,
+      deviceId: command.newDeviceId,
+    });
+
+    const kavaWallet = account.getWalletAddress(ChainType.KAVA);
+    if (!kavaWallet || kavaWallet.address !== wallets.get(ChainType.KAVA)!.address) {
+      throw new ApplicationError('助记词错误');
+    }
+
+    account.addDevice(command.newDeviceId, command.deviceName);
+    account.recordLogin();
+    await this.userRepository.save(account);
+
+    const tokens = await this.tokenService.generateTokenPair({
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      deviceId: command.newDeviceId,
+    });
+
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      nickname: account.nickname,
+      avatarUrl: account.avatarUrl,
+      referralCode: account.referralCode.value,
+      accessToken: tokens.accessToken,
+      refreshToken: tokens.refreshToken,
+    };
+  }
+
+  async recoverByPhone(command: RecoverByPhoneCommand): Promise<RecoverAccountResult> {
+    const accountSequence = AccountSequence.create(command.accountSequence);
+    const account = await this.userRepository.findByAccountSequence(accountSequence);
+    if (!account) throw new ApplicationError('账户序列号不存在');
+    if (!account.isActive) throw new ApplicationError('账户已冻结或注销');
+    if (!account.phoneNumber) throw new ApplicationError('该账户未绑定手机号，请使用助记词恢复');
+
+    const phoneNumber = PhoneNumber.create(command.phoneNumber);
+    if (!account.phoneNumber.equals(phoneNumber)) throw new ApplicationError('手机号与账户不匹配');
+
+    const cachedCode = await this.redisService.get(`sms:recover:${phoneNumber.value}`);
+    if (cachedCode !== command.smsCode) throw new ApplicationError('验证码错误或已过期');
+
+    account.addDevice(command.newDeviceId, command.deviceName);
+    account.recordLogin();
+    await this.userRepository.save(account);
+    await this.redisService.delete(`sms:recover:${phoneNumber.value}`);
+
+    const tokens = await this.tokenService.generateTokenPair({
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      deviceId: command.newDeviceId,
+    });
+
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      nickname: account.nickname,
+      avatarUrl: account.avatarUrl,
+      referralCode: account.referralCode.value,
+      accessToken: tokens.accessToken,
+      refreshToken: tokens.refreshToken,
+    };
+  }
+
+  async autoLogin(command: AutoLoginCommand): Promise<AutoLoginResult> {
+    const payload = await this.tokenService.verifyRefreshToken(command.refreshToken);
+    const account = await this.userRepository.findById(UserId.create(payload.userId));
+    if (!account || !account.isActive) throw new ApplicationError('账户不存在或已冻结');
+    if (!account.isDeviceAuthorized(command.deviceId)) {
+      throw new ApplicationError('设备未授权，请重新登录', 'DEVICE_UNAUTHORIZED');
+    }
+
+    account.addDevice(command.deviceId);
+    account.recordLogin();
+    await this.userRepository.save(account);
+
+    const tokens = await this.tokenService.generateTokenPair({
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      deviceId: command.deviceId,
+    });
+
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      accessToken: tokens.accessToken,
+      refreshToken: tokens.refreshToken,
+    };
+  }
+
+  async sendSmsCode(command: SendSmsCodeCommand): Promise<void> {
+    const phoneNumber = PhoneNumber.create(command.phoneNumber);
+    const code = this.generateSmsCode();
+    const cacheKey = `sms:${command.type.toLowerCase()}:${phoneNumber.value}`;
+
+    await this.smsService.sendVerificationCode(phoneNumber.value, code);
+    await this.redisService.set(cacheKey, code, 300);
+  }
+
+  async register(command: RegisterCommand): Promise<RegisterResult> {
+    const phoneNumber = PhoneNumber.create(command.phoneNumber);
+    const cachedCode = await this.redisService.get(`sms:register:${phoneNumber.value}`);
+    if (cachedCode !== command.smsCode) throw new ApplicationError('验证码错误或已过期');
+
+    const phoneValidation = await this.validatorService.validatePhoneNumber(phoneNumber);
+    if (!phoneValidation.isValid) throw new ApplicationError(phoneValidation.errorMessage!);
+
+    let inviterSequence: AccountSequence | null = null;
+    if (command.inviterReferralCode) {
+      const referralCode = ReferralCode.create(command.inviterReferralCode);
+      const referralValidation = await this.validatorService.validateReferralCode(referralCode);
+      if (!referralValidation.isValid) throw new ApplicationError(referralValidation.errorMessage!);
+      const inviter = await this.userRepository.findByReferralCode(referralCode);
+      inviterSequence = inviter!.accountSequence;
+    }
+
+    const accountSequence = await this.sequenceGenerator.generateNext();
+
+    const account = UserAccount.create({
+      accountSequence,
+      phoneNumber,
+      initialDeviceId: command.deviceId,
+      deviceName: command.deviceName,
+      inviterSequence,
+      province: ProvinceCode.create(command.provinceCode),
+      city: CityCode.create(command.cityCode),
+    });
+
+    await this.userRepository.save(account);
+    await this.redisService.delete(`sms:register:${phoneNumber.value}`);
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+
+    const tokens = await this.tokenService.generateTokenPair({
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      deviceId: command.deviceId,
+    });
+
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      referralCode: account.referralCode.value,
+      accessToken: tokens.accessToken,
+      refreshToken: tokens.refreshToken,
+    };
+  }
+
+  async login(command: LoginCommand): Promise<LoginResult> {
+    const phoneNumber = PhoneNumber.create(command.phoneNumber);
+    const cachedCode = await this.redisService.get(`sms:login:${phoneNumber.value}`);
+    if (cachedCode !== command.smsCode) throw new ApplicationError('验证码错误或已过期');
+
+    const account = await this.userRepository.findByPhoneNumber(phoneNumber);
+    if (!account) throw new ApplicationError('用户不存在');
+    if (!account.isActive) throw new ApplicationError('账户已冻结或注销');
+
+    account.addDevice(command.deviceId);
+    account.recordLogin();
+    await this.userRepository.save(account);
+    await this.redisService.delete(`sms:login:${phoneNumber.value}`);
+
+    const tokens = await this.tokenService.generateTokenPair({
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      deviceId: command.deviceId,
+    });
+
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      accessToken: tokens.accessToken,
+      refreshToken: tokens.refreshToken,
+    };
+  }
+
+  async bindPhoneNumber(command: BindPhoneNumberCommand): Promise<void> {
+    const account = await this.userRepository.findById(UserId.create(command.userId));
+    if (!account) throw new ApplicationError('用户不存在');
+
+    const phoneNumber = PhoneNumber.create(command.phoneNumber);
+    const cachedCode = await this.redisService.get(`sms:bind:${phoneNumber.value}`);
+    if (cachedCode !== command.smsCode) throw new ApplicationError('验证码错误或已过期');
+
+    const validation = await this.validatorService.validatePhoneNumber(phoneNumber);
+    if (!validation.isValid) throw new ApplicationError(validation.errorMessage!);
+
+    account.bindPhoneNumber(phoneNumber);
+    await this.userRepository.save(account);
+    await this.redisService.delete(`sms:bind:${phoneNumber.value}`);
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+  }
+
+  async updateProfile(command: UpdateProfileCommand): Promise<void> {
+    const account = await this.userRepository.findById(UserId.create(command.userId));
+    if (!account) throw new ApplicationError('用户不存在');
+
+    account.updateProfile({
+      nickname: command.nickname,
+      avatarUrl: command.avatarUrl,
+      address: command.address,
+    });
+
+    await this.userRepository.save(account);
+  }
+
+  async submitKYC(command: SubmitKYCCommand): Promise<void> {
+    const account = await this.userRepository.findById(UserId.create(command.userId));
+    if (!account) throw new ApplicationError('用户不存在');
+
+    const kycInfo = KYCInfo.create({
+      realName: command.realName,
+      idCardNumber: command.idCardNumber,
+      idCardFrontUrl: command.idCardFrontUrl,
+      idCardBackUrl: command.idCardBackUrl,
+    });
+
+    account.submitKYC(kycInfo);
+    await this.userRepository.save(account);
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+  }
+
+  async reviewKYC(command: ReviewKYCCommand): Promise<void> {
+    const account = await this.userRepository.findById(UserId.create(command.userId));
+    if (!account) throw new ApplicationError('用户不存在');
+
+    if (command.approved) {
+      account.approveKYC();
+    } else {
+      account.rejectKYC(command.reason || '审核未通过');
+    }
+
+    await this.userRepository.save(account);
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+  }
+
+  async getMyDevices(query: GetMyDevicesQuery): Promise<DeviceDTO[]> {
+    const account = await this.userRepository.findById(UserId.create(query.userId));
+    if (!account) throw new ApplicationError('用户不存在');
+
+    return account.getAllDevices().map((device) => ({
+      deviceId: device.deviceId,
+      deviceName: device.deviceName,
+      addedAt: device.addedAt,
+      lastActiveAt: device.lastActiveAt,
+      isCurrent: device.deviceId === query.currentDeviceId,
+    }));
+  }
+
+  async removeDevice(command: RemoveDeviceCommand): Promise<void> {
+    const account = await this.userRepository.findById(UserId.create(command.userId));
+    if (!account) throw new ApplicationError('用户不存在');
+    if (command.deviceIdToRemove === command.currentDeviceId) {
+      throw new ApplicationError('不能删除当前设备');
+    }
+
+    account.removeDevice(command.deviceIdToRemove);
+    await this.userRepository.save(account);
+    await this.tokenService.revokeDeviceTokens(account.userId.value, command.deviceIdToRemove);
+    await this.eventPublisher.publishAll(account.domainEvents);
+    account.clearDomainEvents();
+  }
+
+  async getMyProfile(query: GetMyProfileQuery): Promise<UserProfileDTO> {
+    const account = await this.userRepository.findById(UserId.create(query.userId));
+    if (!account) throw new ApplicationError('用户不存在');
+    return this.toUserProfileDTO(account);
+  }
+
+  async getUserByReferralCode(query: GetUserByReferralCodeQuery): Promise<UserBriefDTO | null> {
+    const account = await this.userRepository.findByReferralCode(ReferralCode.create(query.referralCode));
+    if (!account) return null;
+
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      nickname: account.nickname,
+      avatarUrl: account.avatarUrl,
+    };
+  }
+
+  private toUserProfileDTO(account: UserAccount): UserProfileDTO {
+    return {
+      userId: account.userId.value,
+      accountSequence: account.accountSequence.value,
+      phoneNumber: account.phoneNumber?.masked() || null,
+      nickname: account.nickname,
+      avatarUrl: account.avatarUrl,
+      referralCode: account.referralCode.value,
+      province: account.province.value,
+      city: account.city.value,
+      address: account.addressDetail,
+      walletAddresses: account.getAllWalletAddresses().map((wa) => ({
+        chainType: wa.chainType,
+        address: wa.address,
+      })),
+      kycStatus: account.kycStatus,
+      kycInfo: account.kycInfo
+        ? { realName: account.kycInfo.realName, idCardNumber: account.kycInfo.maskedIdCardNumber() }
+        : null,
+      status: account.status,
+      registeredAt: account.registeredAt,
+      lastLoginAt: account.lastLoginAt,
+    };
+  }
+
+  private generateSmsCode(): string {
+    return String(Math.floor(100000 + Math.random() * 900000));
+  }
+}
--- a/backend/services/identity-service/identity-service/src/config/app.config.ts
+++ b/backend/services/identity-service/identity-service/src/config/app.config.ts
@ -0,0 +1,4 @@
+export const appConfig = () => ({
+  port: parseInt(process.env.APP_PORT || '3000', 10),
+  env: process.env.APP_ENV || 'development',
+});
--- a/backend/services/identity-service/identity-service/src/config/database.config.ts
+++ b/backend/services/identity-service/identity-service/src/config/database.config.ts
@ -0,0 +1,3 @@
+export const databaseConfig = () => ({
+  url: process.env.DATABASE_URL,
+});
--- a/backend/services/identity-service/identity-service/src/config/index.ts
+++ b/backend/services/identity-service/identity-service/src/config/index.ts
@ -0,0 +1,36 @@
+export const appConfig = () => ({
+  port: parseInt(process.env.APP_PORT || '3000', 10),
+  env: process.env.APP_ENV || 'development',
+});
+
+export const databaseConfig = () => ({
+  url: process.env.DATABASE_URL,
+});
+
+export const jwtConfig = () => ({
+  secret: process.env.JWT_SECRET || 'default-secret',
+  accessExpiresIn: process.env.JWT_ACCESS_EXPIRES_IN || '2h',
+  refreshExpiresIn: process.env.JWT_REFRESH_EXPIRES_IN || '30d',
+});
+
+export const redisConfig = () => ({
+  host: process.env.REDIS_HOST || 'localhost',
+  port: parseInt(process.env.REDIS_PORT || '6379', 10),
+  password: process.env.REDIS_PASSWORD || undefined,
+  db: parseInt(process.env.REDIS_DB || '0', 10),
+});
+
+export const kafkaConfig = () => ({
+  brokers: (process.env.KAFKA_BROKERS || 'localhost:9092').split(','),
+  clientId: process.env.KAFKA_CLIENT_ID || 'identity-service',
+  groupId: process.env.KAFKA_GROUP_ID || 'identity-service-group',
+});
+
+export const smsConfig = () => ({
+  apiUrl: process.env.SMS_API_URL || '',
+  apiKey: process.env.SMS_API_KEY || '',
+});
+
+export const walletConfig = () => ({
+  encryptionSalt: process.env.WALLET_ENCRYPTION_SALT || 'rwa-wallet-salt',
+});
--- a/backend/services/identity-service/identity-service/src/config/jwt.config.ts
+++ b/backend/services/identity-service/identity-service/src/config/jwt.config.ts
@ -0,0 +1,5 @@
+export const jwtConfig = () => ({
+  secret: process.env.JWT_SECRET || 'default-secret',
+  accessExpiresIn: process.env.JWT_ACCESS_EXPIRES_IN || '2h',
+  refreshExpiresIn: process.env.JWT_REFRESH_EXPIRES_IN || '30d',
+});
--- a/backend/services/identity-service/identity-service/src/config/kafka.config.ts
+++ b/backend/services/identity-service/identity-service/src/config/kafka.config.ts
@ -0,0 +1,5 @@
+export const kafkaConfig = () => ({
+  brokers: (process.env.KAFKA_BROKERS || 'localhost:9092').split(','),
+  clientId: process.env.KAFKA_CLIENT_ID || 'identity-service',
+  groupId: process.env.KAFKA_GROUP_ID || 'identity-service-group',
+});
--- a/backend/services/identity-service/identity-service/src/config/redis.config.ts
+++ b/backend/services/identity-service/identity-service/src/config/redis.config.ts
@ -0,0 +1,6 @@
+export const redisConfig = () => ({
+  host: process.env.REDIS_HOST || 'localhost',
+  port: parseInt(process.env.REDIS_PORT || '6379', 10),
+  password: process.env.REDIS_PASSWORD || undefined,
+  db: parseInt(process.env.REDIS_DB || '0', 10),
+});
--- a/backend/services/identity-service/identity-service/src/domain/aggregates/user-account/user-account.aggregate.ts
+++ b/backend/services/identity-service/identity-service/src/domain/aggregates/user-account/user-account.aggregate.ts
@ -0,0 +1,347 @@
+import { DomainError } from '@/shared/exceptions/domain.exception';
+import {
+  UserId, AccountSequence, PhoneNumber, ReferralCode, ProvinceCode, CityCode,
+  DeviceInfo, ChainType, KYCInfo, KYCStatus, AccountStatus,
+} from '@/domain/value-objects';
+import { WalletAddress } from '@/domain/entities/wallet-address.entity';
+import {
+  DomainEvent, UserAccountAutoCreatedEvent, UserAccountCreatedEvent,
+  DeviceAddedEvent, DeviceRemovedEvent, PhoneNumberBoundEvent,
+  WalletAddressBoundEvent, MultipleWalletAddressesBoundEvent,
+  KYCSubmittedEvent, KYCVerifiedEvent, KYCRejectedEvent,
+  UserLocationUpdatedEvent, UserAccountFrozenEvent, UserAccountDeactivatedEvent,
+} from '@/domain/events';
+
+export class UserAccount {
+  private readonly _userId: UserId;
+  private readonly _accountSequence: AccountSequence;
+  private _devices: Map<string, DeviceInfo>;
+  private _phoneNumber: PhoneNumber | null;
+  private _nickname: string;
+  private _avatarUrl: string | null;
+  private readonly _inviterSequence: AccountSequence | null;
+  private readonly _referralCode: ReferralCode;
+  private _province: ProvinceCode;
+  private _city: CityCode;
+  private _address: string | null;
+  private _walletAddresses: Map<ChainType, WalletAddress>;
+  private _kycInfo: KYCInfo | null;
+  private _kycStatus: KYCStatus;
+  private _status: AccountStatus;
+  private readonly _registeredAt: Date;
+  private _lastLoginAt: Date | null;
+  private _updatedAt: Date;
+  private _domainEvents: DomainEvent[] = [];
+
+  // Getters
+  get userId(): UserId { return this._userId; }
+  get accountSequence(): AccountSequence { return this._accountSequence; }
+  get phoneNumber(): PhoneNumber | null { return this._phoneNumber; }
+  get nickname(): string { return this._nickname; }
+  get avatarUrl(): string | null { return this._avatarUrl; }
+  get inviterSequence(): AccountSequence | null { return this._inviterSequence; }
+  get referralCode(): ReferralCode { return this._referralCode; }
+  get province(): ProvinceCode { return this._province; }
+  get city(): CityCode { return this._city; }
+  get addressDetail(): string | null { return this._address; }
+  get kycInfo(): KYCInfo | null { return this._kycInfo; }
+  get kycStatus(): KYCStatus { return this._kycStatus; }
+  get status(): AccountStatus { return this._status; }
+  get registeredAt(): Date { return this._registeredAt; }
+  get lastLoginAt(): Date | null { return this._lastLoginAt; }
+  get updatedAt(): Date { return this._updatedAt; }
+  get isActive(): boolean { return this._status === AccountStatus.ACTIVE; }
+  get isKYCVerified(): boolean { return this._kycStatus === KYCStatus.VERIFIED; }
+  get domainEvents(): DomainEvent[] { return [...this._domainEvents]; }
+
+  private constructor(
+    userId: UserId, accountSequence: AccountSequence, devices: Map<string, DeviceInfo>,
+    phoneNumber: PhoneNumber | null, nickname: string, avatarUrl: string | null,
+    inviterSequence: AccountSequence | null, referralCode: ReferralCode,
+    province: ProvinceCode, city: CityCode, address: string | null,
+    walletAddresses: Map<ChainType, WalletAddress>, kycInfo: KYCInfo | null,
+    kycStatus: KYCStatus, status: AccountStatus, registeredAt: Date,
+    lastLoginAt: Date | null, updatedAt: Date,
+  ) {
+    this._userId = userId;
+    this._accountSequence = accountSequence;
+    this._devices = devices;
+    this._phoneNumber = phoneNumber;
+    this._nickname = nickname;
+    this._avatarUrl = avatarUrl;
+    this._inviterSequence = inviterSequence;
+    this._referralCode = referralCode;
+    this._province = province;
+    this._city = city;
+    this._address = address;
+    this._walletAddresses = walletAddresses;
+    this._kycInfo = kycInfo;
+    this._kycStatus = kycStatus;
+    this._status = status;
+    this._registeredAt = registeredAt;
+    this._lastLoginAt = lastLoginAt;
+    this._updatedAt = updatedAt;
+  }
+
+  static createAutomatic(params: {
+    accountSequence: AccountSequence;
+    initialDeviceId: string;
+    deviceName?: string;
+    inviterSequence: AccountSequence | null;
+    province: ProvinceCode;
+    city: CityCode;
+  }): UserAccount {
+    const devices = new Map<string, DeviceInfo>();
+    devices.set(params.initialDeviceId, new DeviceInfo(
+      params.initialDeviceId, params.deviceName || '未命名设备', new Date(), new Date(),
+    ));
+
+    const account = new UserAccount(
+      UserId.generate(), params.accountSequence, devices, null,
+      `用户${params.accountSequence.value}`, null, params.inviterSequence,
+      ReferralCode.generate(), params.province, params.city, null,
+      new Map(), null, KYCStatus.NOT_VERIFIED, AccountStatus.ACTIVE,
+      new Date(), null, new Date(),
+    );
+
+    account.addDomainEvent(new UserAccountAutoCreatedEvent({
+      userId: account.userId.value,
+      accountSequence: params.accountSequence.value,
+      initialDeviceId: params.initialDeviceId,
+      inviterSequence: params.inviterSequence?.value || null,
+      province: params.province.value,
+      city: params.city.value,
+      registeredAt: account._registeredAt,
+    }));
+
+    return account;
+  }
+
+  static create(params: {
+    accountSequence: AccountSequence;
+    phoneNumber: PhoneNumber;
+    initialDeviceId: string;
+    deviceName?: string;
+    inviterSequence: AccountSequence | null;
+    province: ProvinceCode;
+    city: CityCode;
+  }): UserAccount {
+    const devices = new Map<string, DeviceInfo>();
+    devices.set(params.initialDeviceId, new DeviceInfo(
+      params.initialDeviceId, params.deviceName || '未命名设备', new Date(), new Date(),
+    ));
+
+    const account = new UserAccount(
+      UserId.generate(), params.accountSequence, devices, params.phoneNumber,
+      `用户${params.accountSequence.value}`, null, params.inviterSequence,
+      ReferralCode.generate(), params.province, params.city, null,
+      new Map(), null, KYCStatus.NOT_VERIFIED, AccountStatus.ACTIVE,
+      new Date(), null, new Date(),
+    );
+
+    account.addDomainEvent(new UserAccountCreatedEvent({
+      userId: account.userId.value,
+      accountSequence: params.accountSequence.value,
+      phoneNumber: params.phoneNumber.value,
+      initialDeviceId: params.initialDeviceId,
+      inviterSequence: params.inviterSequence?.value || null,
+      province: params.province.value,
+      city: params.city.value,
+      registeredAt: account._registeredAt,
+    }));
+
+    return account;
+  }
+
+  static reconstruct(params: {
+    userId: string; accountSequence: number; devices: DeviceInfo[];
+    phoneNumber: string | null; nickname: string; avatarUrl: string | null;
+    inviterSequence: number | null; referralCode: string;
+    province: string; city: string; address: string | null;
+    walletAddresses: WalletAddress[]; kycInfo: KYCInfo | null;
+    kycStatus: KYCStatus; status: AccountStatus;
+    registeredAt: Date; lastLoginAt: Date | null; updatedAt: Date;
+  }): UserAccount {
+    const deviceMap = new Map<string, DeviceInfo>();
+    params.devices.forEach(d => deviceMap.set(d.deviceId, d));
+
+    const walletMap = new Map<ChainType, WalletAddress>();
+    params.walletAddresses.forEach(w => walletMap.set(w.chainType, w));
+
+    return new UserAccount(
+      UserId.create(params.userId),
+      AccountSequence.create(params.accountSequence),
+      deviceMap,
+      params.phoneNumber ? PhoneNumber.create(params.phoneNumber) : null,
+      params.nickname,
+      params.avatarUrl,
+      params.inviterSequence ? AccountSequence.create(params.inviterSequence) : null,
+      ReferralCode.create(params.referralCode),
+      ProvinceCode.create(params.province),
+      CityCode.create(params.city),
+      params.address,
+      walletMap,
+      params.kycInfo,
+      params.kycStatus,
+      params.status,
+      params.registeredAt,
+      params.lastLoginAt,
+      params.updatedAt,
+    );
+  }
+
+  addDevice(deviceId: string, deviceName?: string): void {
+    this.ensureActive();
+    if (this._devices.size >= 5 && !this._devices.has(deviceId)) {
+      throw new DomainError('最多允许5个设备同时登录');
+    }
+    if (this._devices.has(deviceId)) {
+      this._devices.get(deviceId)!.updateActivity();
+    } else {
+      this._devices.set(deviceId, new DeviceInfo(deviceId, deviceName || '未命名设备', new Date(), new Date()));
+      this.addDomainEvent(new DeviceAddedEvent({
+        userId: this.userId.value,
+        accountSequence: this.accountSequence.value,
+        deviceId,
+        deviceName: deviceName || '未命名设备',
+      }));
+    }
+    this._updatedAt = new Date();
+  }
+
+  removeDevice(deviceId: string): void {
+    this.ensureActive();
+    if (!this._devices.has(deviceId)) throw new DomainError('设备不存在');
+    if (this._devices.size <= 1) throw new DomainError('至少保留一个设备');
+    this._devices.delete(deviceId);
+    this._updatedAt = new Date();
+    this.addDomainEvent(new DeviceRemovedEvent({ userId: this.userId.value, deviceId }));
+  }
+
+  isDeviceAuthorized(deviceId: string): boolean {
+    return this._devices.has(deviceId);
+  }
+
+  getAllDevices(): DeviceInfo[] {
+    return Array.from(this._devices.values());
+  }
+
+  updateProfile(params: { nickname?: string; avatarUrl?: string; address?: string }): void {
+    this.ensureActive();
+    if (params.nickname) this._nickname = params.nickname;
+    if (params.avatarUrl !== undefined) this._avatarUrl = params.avatarUrl;
+    if (params.address !== undefined) this._address = params.address;
+    this._updatedAt = new Date();
+  }
+
+  updateLocation(province: ProvinceCode, city: CityCode): void {
+    this.ensureActive();
+    this._province = province;
+    this._city = city;
+    this._updatedAt = new Date();
+    this.addDomainEvent(new UserLocationUpdatedEvent({
+      userId: this.userId.value, province: province.value, city: city.value,
+    }));
+  }
+
+  bindPhoneNumber(phoneNumber: PhoneNumber): void {
+    this.ensureActive();
+    if (this._phoneNumber) throw new DomainError('已绑定手机号,不可重复绑定');
+    this._phoneNumber = phoneNumber;
+    this._updatedAt = new Date();
+    this.addDomainEvent(new PhoneNumberBoundEvent({ userId: this.userId.value, phoneNumber: phoneNumber.value }));
+  }
+
+  bindWalletAddress(chainType: ChainType, address: string): void {
+    this.ensureActive();
+    if (this._walletAddresses.has(chainType)) throw new DomainError(`已绑定${chainType}地址`);
+    const walletAddress = WalletAddress.create({ userId: this.userId, chainType, address });
+    this._walletAddresses.set(chainType, walletAddress);
+    this._updatedAt = new Date();
+    this.addDomainEvent(new WalletAddressBoundEvent({ userId: this.userId.value, chainType, address }));
+  }
+
+  bindMultipleWalletAddresses(wallets: Map<ChainType, WalletAddress>): void {
+    this.ensureActive();
+    for (const [chainType, wallet] of wallets) {
+      if (this._walletAddresses.has(chainType)) throw new DomainError(`已绑定${chainType}地址`);
+      this._walletAddresses.set(chainType, wallet);
+    }
+    this._updatedAt = new Date();
+    this.addDomainEvent(new MultipleWalletAddressesBoundEvent({
+      userId: this.userId.value,
+      addresses: Array.from(wallets.entries()).map(([chainType, wallet]) => ({ chainType, address: wallet.address })),
+    }));
+  }
+
+  submitKYC(kycInfo: KYCInfo): void {
+    this.ensureActive();
+    if (this._kycStatus === KYCStatus.VERIFIED) throw new DomainError('已通过KYC认证,不可重复提交');
+    this._kycInfo = kycInfo;
+    this._kycStatus = KYCStatus.PENDING;
+    this._updatedAt = new Date();
+    this.addDomainEvent(new KYCSubmittedEvent({
+      userId: this.userId.value, realName: kycInfo.realName, idCardNumber: kycInfo.idCardNumber,
+    }));
+  }
+
+  approveKYC(): void {
+    if (this._kycStatus !== KYCStatus.PENDING) throw new DomainError('只有待审核状态才能通过KYC');
+    this._kycStatus = KYCStatus.VERIFIED;
+    this._updatedAt = new Date();
+    this.addDomainEvent(new KYCVerifiedEvent({ userId: this.userId.value, verifiedAt: new Date() }));
+  }
+
+  rejectKYC(reason: string): void {
+    if (this._kycStatus !== KYCStatus.PENDING) throw new DomainError('只有待审核状态才能拒绝KYC');
+    this._kycStatus = KYCStatus.REJECTED;
+    this._updatedAt = new Date();
+    this.addDomainEvent(new KYCRejectedEvent({ userId: this.userId.value, reason }));
+  }
+
+  recordLogin(): void {
+    this.ensureActive();
+    this._lastLoginAt = new Date();
+    this._updatedAt = new Date();
+  }
+
+  freeze(reason: string): void {
+    if (this._status === AccountStatus.FROZEN) throw new DomainError('账户已冻结');
+    this._status = AccountStatus.FROZEN;
+    this._updatedAt = new Date();
+    this.addDomainEvent(new UserAccountFrozenEvent({ userId: this.userId.value, reason }));
+  }
+
+  unfreeze(): void {
+    if (this._status !== AccountStatus.FROZEN) throw new DomainError('账户未冻结');
+    this._status = AccountStatus.ACTIVE;
+    this._updatedAt = new Date();
+  }
+
+  deactivate(): void {
+    if (this._status === AccountStatus.DEACTIVATED) throw new DomainError('账户已注销');
+    this._status = AccountStatus.DEACTIVATED;
+    this._updatedAt = new Date();
+    this.addDomainEvent(new UserAccountDeactivatedEvent({ userId: this.userId.value, deactivatedAt: new Date() }));
+  }
+
+  getWalletAddress(chainType: ChainType): WalletAddress | null {
+    return this._walletAddresses.get(chainType) || null;
+  }
+
+  getAllWalletAddresses(): WalletAddress[] {
+    return Array.from(this._walletAddresses.values());
+  }
+
+  private ensureActive(): void {
+    if (this._status !== AccountStatus.ACTIVE) throw new DomainError('账户已冻结或注销');
+  }
+
+  private addDomainEvent(event: DomainEvent): void {
+    this._domainEvents.push(event);
+  }
+
+  clearDomainEvents(): void {
+    this._domainEvents = [];
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/aggregates/user-account/user-account.factory.ts
+++ b/backend/services/identity-service/identity-service/src/domain/aggregates/user-account/user-account.factory.ts
@ -0,0 +1,29 @@
+import { Injectable } from '@nestjs/common';
+import { UserAccount } from './user-account.aggregate';
+import { AccountSequence, PhoneNumber, ProvinceCode, CityCode } from '@/domain/value-objects';
+
+@Injectable()
+export class UserAccountFactory {
+  createAutomatic(params: {
+    accountSequence: AccountSequence;
+    initialDeviceId: string;
+    deviceName?: string;
+    inviterSequence: AccountSequence | null;
+    province: ProvinceCode;
+    city: CityCode;
+  }): UserAccount {
+    return UserAccount.createAutomatic(params);
+  }
+
+  create(params: {
+    accountSequence: AccountSequence;
+    phoneNumber: PhoneNumber;
+    initialDeviceId: string;
+    deviceName?: string;
+    inviterSequence: AccountSequence | null;
+    province: ProvinceCode;
+    city: CityCode;
+  }): UserAccount {
+    return UserAccount.create(params);
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/aggregates/user-account/user-account.spec.ts
+++ b/backend/services/identity-service/identity-service/src/domain/aggregates/user-account/user-account.spec.ts
@ -0,0 +1,79 @@
+import { UserAccount } from './user-account.aggregate';
+import { AccountSequence, ProvinceCode, CityCode } from '@/domain/value-objects';
+import { DomainError } from '@/shared/exceptions/domain.exception';
+
+describe('UserAccount', () => {
+  const createTestAccount = () => {
+    return UserAccount.createAutomatic({
+      accountSequence: AccountSequence.create(1),
+      initialDeviceId: 'device-001',
+      deviceName: 'Test Device',
+      inviterSequence: null,
+      province: ProvinceCode.create('110000'),
+      city: CityCode.create('110100'),
+    });
+  };
+
+  describe('createAutomatic', () => {
+    it('should create account with default values', () => {
+      const account = createTestAccount();
+      expect(account.accountSequence.value).toBe(1);
+      expect(account.nickname).toBe('用户1');
+      expect(account.isActive).toBe(true);
+      expect(account.phoneNumber).toBeNull();
+    });
+
+    it('should add initial device', () => {
+      const account = createTestAccount();
+      expect(account.isDeviceAuthorized('device-001')).toBe(true);
+      expect(account.getAllDevices()).toHaveLength(1);
+    });
+  });
+
+  describe('addDevice', () => {
+    it('should add new device', () => {
+      const account = createTestAccount();
+      account.addDevice('device-002', 'New Device');
+      expect(account.getAllDevices()).toHaveLength(2);
+    });
+
+    it('should throw error when exceeding device limit', () => {
+      const account = createTestAccount();
+      account.addDevice('device-002');
+      account.addDevice('device-003');
+      account.addDevice('device-004');
+      account.addDevice('device-005');
+      
+      expect(() => account.addDevice('device-006')).toThrow(DomainError);
+    });
+  });
+
+  describe('removeDevice', () => {
+    it('should remove existing device', () => {
+      const account = createTestAccount();
+      account.addDevice('device-002');
+      account.removeDevice('device-002');
+      expect(account.getAllDevices()).toHaveLength(1);
+    });
+
+    it('should not remove last device', () => {
+      const account = createTestAccount();
+      expect(() => account.removeDevice('device-001')).toThrow(DomainError);
+    });
+  });
+
+  describe('freeze/unfreeze', () => {
+    it('should freeze active account', () => {
+      const account = createTestAccount();
+      account.freeze('Test reason');
+      expect(account.isActive).toBe(false);
+    });
+
+    it('should unfreeze frozen account', () => {
+      const account = createTestAccount();
+      account.freeze('Test reason');
+      account.unfreeze();
+      expect(account.isActive).toBe(true);
+    });
+  });
+});
--- a/backend/services/identity-service/identity-service/src/domain/domain.module.ts
+++ b/backend/services/identity-service/identity-service/src/domain/domain.module.ts
@ -0,0 +1,25 @@
+import { Module } from '@nestjs/common';
+import { AccountSequenceGeneratorService, UserValidatorService, WalletGeneratorService } from './services';
+import { UserAccountFactory } from './aggregates/user-account/user-account.factory';
+import { USER_ACCOUNT_REPOSITORY } from './repositories/user-account.repository.interface';
+import { UserAccountRepositoryImpl } from '@/infrastructure/persistence/repositories/user-account.repository.impl';
+import { InfrastructureModule } from '@/infrastructure/infrastructure.module';
+
+@Module({
+  imports: [InfrastructureModule],
+  providers: [
+    { provide: USER_ACCOUNT_REPOSITORY, useClass: UserAccountRepositoryImpl },
+    AccountSequenceGeneratorService,
+    UserValidatorService,
+    WalletGeneratorService,
+    UserAccountFactory,
+  ],
+  exports: [
+    USER_ACCOUNT_REPOSITORY,
+    AccountSequenceGeneratorService,
+    UserValidatorService,
+    WalletGeneratorService,
+    UserAccountFactory,
+  ],
+})
+export class DomainModule {}
--- a/backend/services/identity-service/identity-service/src/domain/entities/wallet-address.entity.ts
+++ b/backend/services/identity-service/identity-service/src/domain/entities/wallet-address.entity.ts
@ -0,0 +1,167 @@
+import { HDKey } from '@scure/bip32';
+import { createHash } from 'crypto';
+import { bech32 } from 'bech32';
+import { Wallet } from 'ethers';
+import { DomainError } from '@/shared/exceptions/domain.exception';
+import {
+  AddressId,
+  UserId,
+  ChainType,
+  CHAIN_CONFIG,
+  AddressStatus,
+  Mnemonic,
+  MnemonicEncryption,
+} from '@/domain/value-objects';
+
+export class WalletAddress {
+  private readonly _addressId: AddressId;
+  private readonly _userId: UserId;
+  private readonly _chainType: ChainType;
+  private readonly _address: string;
+  private readonly _encryptedMnemonic: string;
+  private _status: AddressStatus;
+  private readonly _boundAt: Date;
+
+  get addressId(): AddressId { return this._addressId; }
+  get userId(): UserId { return this._userId; }
+  get chainType(): ChainType { return this._chainType; }
+  get address(): string { return this._address; }
+  get encryptedMnemonic(): string { return this._encryptedMnemonic; }
+  get status(): AddressStatus { return this._status; }
+  get boundAt(): Date { return this._boundAt; }
+
+  private constructor(
+    addressId: AddressId,
+    userId: UserId,
+    chainType: ChainType,
+    address: string,
+    encryptedMnemonic: string,
+    status: AddressStatus,
+    boundAt: Date,
+  ) {
+    this._addressId = addressId;
+    this._userId = userId;
+    this._chainType = chainType;
+    this._address = address;
+    this._encryptedMnemonic = encryptedMnemonic;
+    this._status = status;
+    this._boundAt = boundAt;
+  }
+
+  static create(params: { userId: UserId; chainType: ChainType; address: string }): WalletAddress {
+    if (!this.validateAddress(params.chainType, params.address)) {
+      throw new DomainError(`${params.chainType}地址格式错误`);
+    }
+    return new WalletAddress(
+      AddressId.generate(),
+      params.userId,
+      params.chainType,
+      params.address,
+      '',
+      AddressStatus.ACTIVE,
+      new Date(),
+    );
+  }
+
+  static createFromMnemonic(params: {
+    userId: UserId;
+    chainType: ChainType;
+    mnemonic: Mnemonic;
+    encryptionKey: string;
+  }): WalletAddress {
+    const address = this.deriveAddress(params.chainType, params.mnemonic);
+    const encryptedMnemonic = MnemonicEncryption.encrypt(params.mnemonic.value, params.encryptionKey);
+    return new WalletAddress(
+      AddressId.generate(),
+      params.userId,
+      params.chainType,
+      address,
+      encryptedMnemonic,
+      AddressStatus.ACTIVE,
+      new Date(),
+    );
+  }
+
+  static reconstruct(params: {
+    addressId: string;
+    userId: string;
+    chainType: ChainType;
+    address: string;
+    encryptedMnemonic: string;
+    status: AddressStatus;
+    boundAt: Date;
+  }): WalletAddress {
+    return new WalletAddress(
+      AddressId.create(params.addressId),
+      UserId.create(params.userId),
+      params.chainType,
+      params.address,
+      params.encryptedMnemonic,
+      params.status,
+      params.boundAt,
+    );
+  }
+
+  disable(): void {
+    this._status = AddressStatus.DISABLED;
+  }
+
+  enable(): void {
+    this._status = AddressStatus.ACTIVE;
+  }
+
+  decryptMnemonic(encryptionKey: string): Mnemonic {
+    if (!this._encryptedMnemonic) {
+      throw new DomainError('该地址没有加密助记词');
+    }
+    const mnemonicStr = MnemonicEncryption.decrypt(this._encryptedMnemonic, encryptionKey);
+    return Mnemonic.create(mnemonicStr);
+  }
+
+  private static deriveAddress(chainType: ChainType, mnemonic: Mnemonic): string {
+    const seed = mnemonic.toSeed();
+    const config = CHAIN_CONFIG[chainType];
+
+    switch (chainType) {
+      case ChainType.KAVA:
+      case ChainType.DST:
+        return this.deriveCosmosAddress(Buffer.from(seed), config.derivationPath, config.prefix);
+      case ChainType.BSC:
+        return this.deriveEVMAddress(Buffer.from(seed), config.derivationPath);
+      default:
+        throw new DomainError(`不支持的链类型: ${chainType}`);
+    }
+  }
+
+  private static deriveCosmosAddress(seed: Buffer, path: string, prefix: string): string {
+    const hdkey = HDKey.fromMasterSeed(seed);
+    const childKey = hdkey.derive(path);
+    if (!childKey.publicKey) throw new DomainError('无法派生公钥');
+
+    const hash = createHash('sha256').update(childKey.publicKey).digest();
+    const addressHash = createHash('ripemd160').update(hash).digest();
+    const words = bech32.toWords(addressHash);
+    return bech32.encode(prefix, words);
+  }
+
+  private static deriveEVMAddress(seed: Buffer, path: string): string {
+    const hdkey = HDKey.fromMasterSeed(seed);
+    const childKey = hdkey.derive(path);
+    if (!childKey.privateKey) throw new DomainError('无法派生私钥');
+
+    const wallet = new Wallet(Buffer.from(childKey.privateKey).toString('hex'));
+    return wallet.address;
+  }
+
+  private static validateAddress(chainType: ChainType, address: string): boolean {
+    switch (chainType) {
+      case ChainType.KAVA:
+      case ChainType.DST:
+        return /^(kava|dst)1[a-z0-9]{38}$/.test(address);
+      case ChainType.BSC:
+        return /^0x[a-fA-F0-9]{40}$/.test(address);
+      default:
+        return false;
+    }
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/events/device-added.event.ts
+++ b/backend/services/identity-service/identity-service/src/domain/events/device-added.event.ts
@ -0,0 +1,18 @@
+import { DomainEvent } from './index';
+
+export class DeviceAddedEvent extends DomainEvent {
+  constructor(
+    public readonly payload: {
+      userId: string;
+      accountSequence: number;
+      deviceId: string;
+      deviceName: string;
+    },
+  ) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'DeviceAdded';
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/events/index.ts
+++ b/backend/services/identity-service/identity-service/src/domain/events/index.ts
@ -0,0 +1,174 @@
+export abstract class DomainEvent {
+  public readonly occurredAt: Date;
+  public readonly eventId: string;
+
+  constructor() {
+    this.occurredAt = new Date();
+    this.eventId = crypto.randomUUID();
+  }
+
+  abstract get eventType(): string;
+}
+
+export class UserAccountAutoCreatedEvent extends DomainEvent {
+  constructor(
+    public readonly payload: {
+      userId: string;
+      accountSequence: number;
+      initialDeviceId: string;
+      inviterSequence: number | null;
+      province: string;
+      city: string;
+      registeredAt: Date;
+    },
+  ) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'UserAccountAutoCreated';
+  }
+}
+
+export class UserAccountCreatedEvent extends DomainEvent {
+  constructor(
+    public readonly payload: {
+      userId: string;
+      accountSequence: number;
+      phoneNumber: string;
+      initialDeviceId: string;
+      inviterSequence: number | null;
+      province: string;
+      city: string;
+      registeredAt: Date;
+    },
+  ) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'UserAccountCreated';
+  }
+}
+
+export class DeviceAddedEvent extends DomainEvent {
+  constructor(
+    public readonly payload: {
+      userId: string;
+      accountSequence: number;
+      deviceId: string;
+      deviceName: string;
+    },
+  ) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'DeviceAdded';
+  }
+}
+
+export class DeviceRemovedEvent extends DomainEvent {
+  constructor(public readonly payload: { userId: string; deviceId: string }) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'DeviceRemoved';
+  }
+}
+
+export class PhoneNumberBoundEvent extends DomainEvent {
+  constructor(public readonly payload: { userId: string; phoneNumber: string }) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'PhoneNumberBound';
+  }
+}
+
+export class WalletAddressBoundEvent extends DomainEvent {
+  constructor(public readonly payload: { userId: string; chainType: string; address: string }) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'WalletAddressBound';
+  }
+}
+
+export class MultipleWalletAddressesBoundEvent extends DomainEvent {
+  constructor(
+    public readonly payload: {
+      userId: string;
+      addresses: Array<{ chainType: string; address: string }>;
+    },
+  ) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'MultipleWalletAddressesBound';
+  }
+}
+
+export class KYCSubmittedEvent extends DomainEvent {
+  constructor(public readonly payload: { userId: string; realName: string; idCardNumber: string }) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'KYCSubmitted';
+  }
+}
+
+export class KYCVerifiedEvent extends DomainEvent {
+  constructor(public readonly payload: { userId: string; verifiedAt: Date }) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'KYCVerified';
+  }
+}
+
+export class KYCRejectedEvent extends DomainEvent {
+  constructor(public readonly payload: { userId: string; reason: string }) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'KYCRejected';
+  }
+}
+
+export class UserLocationUpdatedEvent extends DomainEvent {
+  constructor(public readonly payload: { userId: string; province: string; city: string }) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'UserLocationUpdated';
+  }
+}
+
+export class UserAccountFrozenEvent extends DomainEvent {
+  constructor(public readonly payload: { userId: string; reason: string }) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'UserAccountFrozen';
+  }
+}
+
+export class UserAccountDeactivatedEvent extends DomainEvent {
+  constructor(public readonly payload: { userId: string; deactivatedAt: Date }) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'UserAccountDeactivated';
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/events/phone-bound.event.ts
+++ b/backend/services/identity-service/identity-service/src/domain/events/phone-bound.event.ts
@ -0,0 +1,11 @@
+import { DomainEvent } from './index';
+
+export class PhoneNumberBoundEvent extends DomainEvent {
+  constructor(public readonly payload: { userId: string; phoneNumber: string }) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'PhoneNumberBound';
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/events/user-account-created.event.ts
+++ b/backend/services/identity-service/identity-service/src/domain/events/user-account-created.event.ts
@ -0,0 +1,22 @@
+import { DomainEvent } from './index';
+
+export class UserAccountCreatedEvent extends DomainEvent {
+  constructor(
+    public readonly payload: {
+      userId: string;
+      accountSequence: number;
+      phoneNumber: string;
+      initialDeviceId: string;
+      inviterSequence: number | null;
+      province: string;
+      city: string;
+      registeredAt: Date;
+    },
+  ) {
+    super();
+  }
+
+  get eventType(): string {
+    return 'UserAccountCreated';
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/repositories/user-account.repository.interface.ts
+++ b/backend/services/identity-service/identity-service/src/domain/repositories/user-account.repository.interface.ts
@ -0,0 +1,30 @@
+import { UserAccount } from '@/domain/aggregates/user-account/user-account.aggregate';
+import { WalletAddress } from '@/domain/entities/wallet-address.entity';
+import {
+  UserId, AccountSequence, PhoneNumber, ReferralCode, ChainType, AccountStatus, KYCStatus,
+} from '@/domain/value-objects';
+
+export interface Pagination {
+  page: number;
+  limit: number;
+}
+
+export interface UserAccountRepository {
+  save(account: UserAccount): Promise<void>;
+  saveWallets(userId: UserId, wallets: WalletAddress[]): Promise<void>;
+  findById(userId: UserId): Promise<UserAccount | null>;
+  findByAccountSequence(sequence: AccountSequence): Promise<UserAccount | null>;
+  findByDeviceId(deviceId: string): Promise<UserAccount | null>;
+  findByPhoneNumber(phoneNumber: PhoneNumber): Promise<UserAccount | null>;
+  findByReferralCode(referralCode: ReferralCode): Promise<UserAccount | null>;
+  findByWalletAddress(chainType: ChainType, address: string): Promise<UserAccount | null>;
+  getMaxAccountSequence(): Promise<AccountSequence | null>;
+  getNextAccountSequence(): Promise<AccountSequence>;
+  findUsers(
+    filters?: { status?: AccountStatus; kycStatus?: KYCStatus; province?: string; city?: string; keyword?: string },
+    pagination?: Pagination,
+  ): Promise<UserAccount[]>;
+  countUsers(filters?: { status?: AccountStatus; kycStatus?: KYCStatus }): Promise<number>;
+}
+
+export const USER_ACCOUNT_REPOSITORY = Symbol('USER_ACCOUNT_REPOSITORY');
--- a/backend/services/identity-service/identity-service/src/domain/services/account-sequence-generator.service.ts
+++ b/backend/services/identity-service/identity-service/src/domain/services/account-sequence-generator.service.ts
@ -0,0 +1,15 @@
+import { Injectable, Inject } from '@nestjs/common';
+import { UserAccountRepository, USER_ACCOUNT_REPOSITORY } from '@/domain/repositories/user-account.repository.interface';
+import { AccountSequence } from '@/domain/value-objects';
+
+@Injectable()
+export class AccountSequenceGeneratorService {
+  constructor(
+    @Inject(USER_ACCOUNT_REPOSITORY)
+    private readonly repository: UserAccountRepository,
+  ) {}
+
+  async generateNext(): Promise<AccountSequence> {
+    return this.repository.getNextAccountSequence();
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/services/index.ts
+++ b/backend/services/identity-service/identity-service/src/domain/services/index.ts
@ -0,0 +1,121 @@
+import { Injectable, Inject } from '@nestjs/common';
+import { createHash } from 'crypto';
+import { UserAccount } from '@/domain/aggregates/user-account/user-account.aggregate';
+import { WalletAddress } from '@/domain/entities/wallet-address.entity';
+import { UserAccountRepository, USER_ACCOUNT_REPOSITORY } from '@/domain/repositories/user-account.repository.interface';
+import {
+  AccountSequence, PhoneNumber, ReferralCode, ChainType, Mnemonic, UserId,
+} from '@/domain/value-objects';
+
+// ============ ValidationResult ============
+export class ValidationResult {
+  private constructor(
+    public readonly isValid: boolean,
+    public readonly errorMessage: string | null,
+  ) {}
+
+  static success(): ValidationResult {
+    return new ValidationResult(true, null);
+  }
+
+  static failure(message: string): ValidationResult {
+    return new ValidationResult(false, message);
+  }
+}
+
+// ============ AccountSequenceGeneratorService ============
+@Injectable()
+export class AccountSequenceGeneratorService {
+  constructor(
+    @Inject(USER_ACCOUNT_REPOSITORY)
+    private readonly repository: UserAccountRepository,
+  ) {}
+
+  async generateNext(): Promise<AccountSequence> {
+    return this.repository.getNextAccountSequence();
+  }
+}
+
+// ============ UserValidatorService ============
+@Injectable()
+export class UserValidatorService {
+  constructor(
+    @Inject(USER_ACCOUNT_REPOSITORY)
+    private readonly repository: UserAccountRepository,
+  ) {}
+
+  async validatePhoneNumber(phoneNumber: PhoneNumber): Promise<ValidationResult> {
+    const existing = await this.repository.findByPhoneNumber(phoneNumber);
+    if (existing) return ValidationResult.failure('该手机号已注册');
+    return ValidationResult.success();
+  }
+
+  async validateDeviceId(deviceId: string): Promise<ValidationResult> {
+    const existing = await this.repository.findByDeviceId(deviceId);
+    if (existing) return ValidationResult.failure('该设备已创建账户');
+    return ValidationResult.success();
+  }
+
+  async validateReferralCode(referralCode: ReferralCode): Promise<ValidationResult> {
+    const inviter = await this.repository.findByReferralCode(referralCode);
+    if (!inviter) return ValidationResult.failure('推荐码不存在');
+    if (!inviter.isActive) return ValidationResult.failure('推荐人账户已冻结或注销');
+    return ValidationResult.success();
+  }
+
+  async validateWalletAddress(chainType: ChainType, address: string): Promise<ValidationResult> {
+    const existing = await this.repository.findByWalletAddress(chainType, address);
+    if (existing) return ValidationResult.failure('该地址已被其他账户绑定');
+    return ValidationResult.success();
+  }
+}
+
+// ============ WalletGeneratorService ============
+@Injectable()
+export class WalletGeneratorService {
+  generateWalletSystem(params: { userId: UserId; deviceId: string }): {
+    mnemonic: Mnemonic;
+    wallets: Map<ChainType, WalletAddress>;
+  } {
+    const mnemonic = Mnemonic.generate();
+    const encryptionKey = this.deriveEncryptionKey(params.deviceId, params.userId.value);
+
+    const wallets = new Map<ChainType, WalletAddress>();
+    const chains = [ChainType.KAVA, ChainType.DST, ChainType.BSC];
+
+    for (const chainType of chains) {
+      const wallet = WalletAddress.createFromMnemonic({
+        userId: params.userId,
+        chainType,
+        mnemonic,
+        encryptionKey,
+      });
+      wallets.set(chainType, wallet);
+    }
+
+    return { mnemonic, wallets };
+  }
+
+  recoverWalletSystem(params: { userId: UserId; mnemonic: Mnemonic; deviceId: string }): Map<ChainType, WalletAddress> {
+    const encryptionKey = this.deriveEncryptionKey(params.deviceId, params.userId.value);
+    const wallets = new Map<ChainType, WalletAddress>();
+    const chains = [ChainType.KAVA, ChainType.DST, ChainType.BSC];
+
+    for (const chainType of chains) {
+      const wallet = WalletAddress.createFromMnemonic({
+        userId: params.userId,
+        chainType,
+        mnemonic: params.mnemonic,
+        encryptionKey,
+      });
+      wallets.set(chainType, wallet);
+    }
+
+    return wallets;
+  }
+
+  private deriveEncryptionKey(deviceId: string, userId: string): string {
+    const input = `${deviceId}:${userId}`;
+    return createHash('sha256').update(input).digest('hex');
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/services/user-validator.service.ts
+++ b/backend/services/identity-service/identity-service/src/domain/services/user-validator.service.ts
@ -0,0 +1,51 @@
+import { Injectable, Inject } from '@nestjs/common';
+import { UserAccountRepository, USER_ACCOUNT_REPOSITORY } from '@/domain/repositories/user-account.repository.interface';
+import { PhoneNumber, ReferralCode, ChainType } from '@/domain/value-objects';
+
+export class ValidationResult {
+  private constructor(
+    public readonly isValid: boolean,
+    public readonly errorMessage: string | null,
+  ) {}
+
+  static success(): ValidationResult {
+    return new ValidationResult(true, null);
+  }
+
+  static failure(message: string): ValidationResult {
+    return new ValidationResult(false, message);
+  }
+}
+
+@Injectable()
+export class UserValidatorService {
+  constructor(
+    @Inject(USER_ACCOUNT_REPOSITORY)
+    private readonly repository: UserAccountRepository,
+  ) {}
+
+  async validatePhoneNumber(phoneNumber: PhoneNumber): Promise<ValidationResult> {
+    const existing = await this.repository.findByPhoneNumber(phoneNumber);
+    if (existing) return ValidationResult.failure('该手机号已注册');
+    return ValidationResult.success();
+  }
+
+  async validateDeviceId(deviceId: string): Promise<ValidationResult> {
+    const existing = await this.repository.findByDeviceId(deviceId);
+    if (existing) return ValidationResult.failure('该设备已创建账户');
+    return ValidationResult.success();
+  }
+
+  async validateReferralCode(referralCode: ReferralCode): Promise<ValidationResult> {
+    const inviter = await this.repository.findByReferralCode(referralCode);
+    if (!inviter) return ValidationResult.failure('推荐码不存在');
+    if (!inviter.isActive) return ValidationResult.failure('推荐人账户已冻结或注销');
+    return ValidationResult.success();
+  }
+
+  async validateWalletAddress(chainType: ChainType, address: string): Promise<ValidationResult> {
+    const existing = await this.repository.findByWalletAddress(chainType, address);
+    if (existing) return ValidationResult.failure('该地址已被其他账户绑定');
+    return ValidationResult.success();
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/services/wallet-generator.service.ts
+++ b/backend/services/identity-service/identity-service/src/domain/services/wallet-generator.service.ts
@ -0,0 +1,53 @@
+import { Injectable } from '@nestjs/common';
+import { createHash } from 'crypto';
+import { WalletAddress } from '@/domain/entities/wallet-address.entity';
+import { ChainType, Mnemonic, UserId } from '@/domain/value-objects';
+
+@Injectable()
+export class WalletGeneratorService {
+  generateWalletSystem(params: { userId: UserId; deviceId: string }): {
+    mnemonic: Mnemonic;
+    wallets: Map<ChainType, WalletAddress>;
+  } {
+    const mnemonic = Mnemonic.generate();
+    const encryptionKey = this.deriveEncryptionKey(params.deviceId, params.userId.value);
+
+    const wallets = new Map<ChainType, WalletAddress>();
+    const chains = [ChainType.KAVA, ChainType.DST, ChainType.BSC];
+
+    for (const chainType of chains) {
+      const wallet = WalletAddress.createFromMnemonic({
+        userId: params.userId,
+        chainType,
+        mnemonic,
+        encryptionKey,
+      });
+      wallets.set(chainType, wallet);
+    }
+
+    return { mnemonic, wallets };
+  }
+
+  recoverWalletSystem(params: { userId: UserId; mnemonic: Mnemonic; deviceId: string }): Map<ChainType, WalletAddress> {
+    const encryptionKey = this.deriveEncryptionKey(params.deviceId, params.userId.value);
+    const wallets = new Map<ChainType, WalletAddress>();
+    const chains = [ChainType.KAVA, ChainType.DST, ChainType.BSC];
+
+    for (const chainType of chains) {
+      const wallet = WalletAddress.createFromMnemonic({
+        userId: params.userId,
+        chainType,
+        mnemonic: params.mnemonic,
+        encryptionKey,
+      });
+      wallets.set(chainType, wallet);
+    }
+
+    return wallets;
+  }
+
+  private deriveEncryptionKey(deviceId: string, userId: string): string {
+    const input = `${deviceId}:${userId}`;
+    return createHash('sha256').update(input).digest('hex');
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/value-objects/account-sequence.vo.ts
+++ b/backend/services/identity-service/identity-service/src/domain/value-objects/account-sequence.vo.ts
@ -0,0 +1,19 @@
+import { DomainError } from '@/shared/exceptions/domain.exception';
+
+export class AccountSequence {
+  constructor(public readonly value: number) {
+    if (value <= 0) throw new DomainError('账户序列号必须大于0');
+  }
+
+  static create(value: number): AccountSequence {
+    return new AccountSequence(value);
+  }
+
+  static next(current: AccountSequence): AccountSequence {
+    return new AccountSequence(current.value + 1);
+  }
+
+  equals(other: AccountSequence): boolean {
+    return this.value === other.value;
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/value-objects/device-info.vo.ts
+++ b/backend/services/identity-service/identity-service/src/domain/value-objects/device-info.vo.ts
@ -0,0 +1,20 @@
+export class DeviceInfo {
+  private _lastActiveAt: Date;
+
+  constructor(
+    public readonly deviceId: string,
+    public readonly deviceName: string,
+    public readonly addedAt: Date,
+    lastActiveAt: Date,
+  ) {
+    this._lastActiveAt = lastActiveAt;
+  }
+
+  get lastActiveAt(): Date {
+    return this._lastActiveAt;
+  }
+
+  updateActivity(): void {
+    this._lastActiveAt = new Date();
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/value-objects/index.ts
+++ b/backend/services/identity-service/identity-service/src/domain/value-objects/index.ts
@ -0,0 +1,262 @@
+import { DomainError } from '@/shared/exceptions/domain.exception';
+import { createHash, createCipheriv, createDecipheriv, randomBytes, scryptSync } from 'crypto';
+import * as bip39 from '@scure/bip39';
+import { wordlist } from '@scure/bip39/wordlists/english';
+
+// ============ UserId ============
+export class UserId {
+  constructor(public readonly value: string) {
+    if (!value) throw new DomainError('UserId不能为空');
+  }
+
+  static generate(): UserId {
+    return new UserId(crypto.randomUUID());
+  }
+
+  static create(value: string): UserId {
+    return new UserId(value);
+  }
+
+  equals(other: UserId): boolean {
+    return this.value === other.value;
+  }
+}
+
+// ============ AccountSequence ============
+export class AccountSequence {
+  constructor(public readonly value: number) {
+    if (value <= 0) throw new DomainError('账户序列号必须大于0');
+  }
+
+  static create(value: number): AccountSequence {
+    return new AccountSequence(value);
+  }
+
+  static next(current: AccountSequence): AccountSequence {
+    return new AccountSequence(current.value + 1);
+  }
+
+  equals(other: AccountSequence): boolean {
+    return this.value === other.value;
+  }
+}
+
+// ============ PhoneNumber ============
+export class PhoneNumber {
+  constructor(public readonly value: string) {
+    if (!/^1[3-9]\d{9}$/.test(value)) {
+      throw new DomainError('手机号格式错误');
+    }
+  }
+
+  static create(value: string): PhoneNumber {
+    return new PhoneNumber(value);
+  }
+
+  equals(other: PhoneNumber): boolean {
+    return this.value === other.value;
+  }
+
+  masked(): string {
+    return this.value.replace(/(\d{3})\d{4}(\d{4})/, '$1****$2');
+  }
+}
+
+// ============ ReferralCode ============
+export class ReferralCode {
+  constructor(public readonly value: string) {
+    if (!/^[A-Z0-9]{6}$/.test(value)) {
+      throw new DomainError('推荐码格式错误');
+    }
+  }
+
+  static generate(): ReferralCode {
+    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+    let code = '';
+    for (let i = 0; i < 6; i++) {
+      code += chars.charAt(Math.floor(Math.random() * chars.length));
+    }
+    return new ReferralCode(code);
+  }
+
+  static create(value: string): ReferralCode {
+    return new ReferralCode(value.toUpperCase());
+  }
+
+  equals(other: ReferralCode): boolean {
+    return this.value === other.value;
+  }
+}
+
+// ============ ProvinceCode & CityCode ============
+export class ProvinceCode {
+  constructor(public readonly value: string) {}
+
+  static create(value: string): ProvinceCode {
+    return new ProvinceCode(value || 'DEFAULT');
+  }
+}
+
+export class CityCode {
+  constructor(public readonly value: string) {}
+
+  static create(value: string): CityCode {
+    return new CityCode(value || 'DEFAULT');
+  }
+}
+
+// ============ Mnemonic ============
+export class Mnemonic {
+  constructor(public readonly value: string) {
+    if (!bip39.validateMnemonic(value, wordlist)) {
+      throw new DomainError('助记词格式错误');
+    }
+  }
+
+  static generate(): Mnemonic {
+    const mnemonic = bip39.generateMnemonic(wordlist, 128);
+    return new Mnemonic(mnemonic);
+  }
+
+  static create(value: string): Mnemonic {
+    return new Mnemonic(value);
+  }
+
+  toSeed(): Uint8Array {
+    return bip39.mnemonicToSeedSync(this.value);
+  }
+
+  getWords(): string[] {
+    return this.value.split(' ');
+  }
+
+  equals(other: Mnemonic): boolean {
+    return this.value === other.value;
+  }
+}
+
+// ============ DeviceInfo ============
+export class DeviceInfo {
+  private _lastActiveAt: Date;
+
+  constructor(
+    public readonly deviceId: string,
+    public readonly deviceName: string,
+    public readonly addedAt: Date,
+    lastActiveAt: Date,
+  ) {
+    this._lastActiveAt = lastActiveAt;
+  }
+
+  get lastActiveAt(): Date {
+    return this._lastActiveAt;
+  }
+
+  updateActivity(): void {
+    this._lastActiveAt = new Date();
+  }
+}
+
+// ============ ChainType ============
+export enum ChainType {
+  KAVA = 'KAVA',
+  DST = 'DST',
+  BSC = 'BSC',
+}
+
+export const CHAIN_CONFIG = {
+  [ChainType.KAVA]: { prefix: 'kava', derivationPath: "m/44'/459'/0'/0/0" },
+  [ChainType.DST]: { prefix: 'dst', derivationPath: "m/44'/118'/0'/0/0" },
+  [ChainType.BSC]: { prefix: '0x', derivationPath: "m/44'/60'/0'/0/0" },
+};
+
+// ============ KYCInfo ============
+export class KYCInfo {
+  constructor(
+    public readonly realName: string,
+    public readonly idCardNumber: string,
+    public readonly idCardFrontUrl: string,
+    public readonly idCardBackUrl: string,
+  ) {
+    if (!realName || realName.length < 2) {
+      throw new DomainError('真实姓名不合法');
+    }
+    if (!/^[1-9]\d{5}(18|19|20)\d{2}(0[1-9]|1[0-2])(0[1-9]|[12]\d|3[01])\d{3}[0-9Xx]$/.test(idCardNumber)) {
+      throw new DomainError('身份证号格式错误');
+    }
+  }
+
+  static create(params: { realName: string; idCardNumber: string; idCardFrontUrl: string; idCardBackUrl: string }): KYCInfo {
+    return new KYCInfo(params.realName, params.idCardNumber, params.idCardFrontUrl, params.idCardBackUrl);
+  }
+
+  maskedIdCardNumber(): string {
+    return this.idCardNumber.replace(/(\d{6})\d{8}(\d{4})/, '$1********$2');
+  }
+}
+
+// ============ Enums ============
+export enum KYCStatus {
+  NOT_VERIFIED = 'NOT_VERIFIED',
+  PENDING = 'PENDING',
+  VERIFIED = 'VERIFIED',
+  REJECTED = 'REJECTED',
+}
+
+export enum AccountStatus {
+  ACTIVE = 'ACTIVE',
+  FROZEN = 'FROZEN',
+  DEACTIVATED = 'DEACTIVATED',
+}
+
+export enum AddressStatus {
+  ACTIVE = 'ACTIVE',
+  DISABLED = 'DISABLED',
+}
+
+// ============ AddressId ============
+export class AddressId {
+  constructor(public readonly value: string) {}
+
+  static generate(): AddressId {
+    return new AddressId(crypto.randomUUID());
+  }
+
+  static create(value: string): AddressId {
+    return new AddressId(value);
+  }
+}
+
+// ============ MnemonicEncryption ============
+export class MnemonicEncryption {
+  static encrypt(mnemonic: string, key: string): string {
+    const derivedKey = this.deriveKey(key);
+    const iv = randomBytes(16);
+    const cipher = createCipheriv('aes-256-gcm', derivedKey, iv);
+
+    let encrypted = cipher.update(mnemonic, 'utf8', 'hex');
+    encrypted += cipher.final('hex');
+    const authTag = cipher.getAuthTag();
+
+    return JSON.stringify({
+      encrypted,
+      authTag: authTag.toString('hex'),
+      iv: iv.toString('hex'),
+    });
+  }
+
+  static decrypt(encryptedData: string, key: string): string {
+    const { encrypted, authTag, iv } = JSON.parse(encryptedData);
+    const derivedKey = this.deriveKey(key);
+    const decipher = createDecipheriv('aes-256-gcm', derivedKey, Buffer.from(iv, 'hex'));
+    decipher.setAuthTag(Buffer.from(authTag, 'hex'));
+
+    let decrypted = decipher.update(encrypted, 'hex', 'utf8');
+    decrypted += decipher.final('utf8');
+    return decrypted;
+  }
+
+  private static deriveKey(password: string): Buffer {
+    return scryptSync(password, 'rwa-wallet-salt', 32);
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/value-objects/kyc-info.vo.ts
+++ b/backend/services/identity-service/identity-service/src/domain/value-objects/kyc-info.vo.ts
@ -0,0 +1,25 @@
+import { DomainError } from '@/shared/exceptions/domain.exception';
+
+export class KYCInfo {
+  constructor(
+    public readonly realName: string,
+    public readonly idCardNumber: string,
+    public readonly idCardFrontUrl: string,
+    public readonly idCardBackUrl: string,
+  ) {
+    if (!realName || realName.length < 2) {
+      throw new DomainError('真实姓名不合法');
+    }
+    if (!/^[1-9]\d{5}(18|19|20)\d{2}(0[1-9]|1[0-2])(0[1-9]|[12]\d|3[01])\d{3}[0-9Xx]$/.test(idCardNumber)) {
+      throw new DomainError('身份证号格式错误');
+    }
+  }
+
+  static create(params: { realName: string; idCardNumber: string; idCardFrontUrl: string; idCardBackUrl: string }): KYCInfo {
+    return new KYCInfo(params.realName, params.idCardNumber, params.idCardFrontUrl, params.idCardBackUrl);
+  }
+
+  maskedIdCardNumber(): string {
+    return this.idCardNumber.replace(/(\d{6})\d{8}(\d{4})/, '$1********$2');
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/value-objects/mnemonic.vo.ts
+++ b/backend/services/identity-service/identity-service/src/domain/value-objects/mnemonic.vo.ts
@ -0,0 +1,32 @@
+import { DomainError } from '@/shared/exceptions/domain.exception';
+import * as bip39 from '@scure/bip39';
+import { wordlist } from '@scure/bip39/wordlists/english';
+
+export class Mnemonic {
+  constructor(public readonly value: string) {
+    if (!bip39.validateMnemonic(value, wordlist)) {
+      throw new DomainError('助记词格式错误');
+    }
+  }
+
+  static generate(): Mnemonic {
+    const mnemonic = bip39.generateMnemonic(wordlist, 128);
+    return new Mnemonic(mnemonic);
+  }
+
+  static create(value: string): Mnemonic {
+    return new Mnemonic(value);
+  }
+
+  toSeed(): Uint8Array {
+    return bip39.mnemonicToSeedSync(this.value);
+  }
+
+  getWords(): string[] {
+    return this.value.split(' ');
+  }
+
+  equals(other: Mnemonic): boolean {
+    return this.value === other.value;
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/value-objects/phone-number.vo.ts
+++ b/backend/services/identity-service/identity-service/src/domain/value-objects/phone-number.vo.ts
@ -0,0 +1,21 @@
+import { DomainError } from '@/shared/exceptions/domain.exception';
+
+export class PhoneNumber {
+  constructor(public readonly value: string) {
+    if (!/^1[3-9]\d{9}$/.test(value)) {
+      throw new DomainError('手机号格式错误');
+    }
+  }
+
+  static create(value: string): PhoneNumber {
+    return new PhoneNumber(value);
+  }
+
+  equals(other: PhoneNumber): boolean {
+    return this.value === other.value;
+  }
+
+  masked(): string {
+    return this.value.replace(/(\d{3})\d{4}(\d{4})/, '$1****$2');
+  }
+}
--- a/backend/services/identity-service/identity-service/src/domain/value-objects/referral-code.vo.ts
+++ b/backend/services/identity-service/identity-service/src/domain/value-objects/referral-code.vo.ts
@ -0,0 +1,26 @@
+import { DomainError } from '@/shared/exceptions/domain.exception';
+
+export class ReferralCode {
+  constructor(public readonly value: string) {
+    if (!/^[A-Z0-9]{6}$/.test(value)) {
+      throw new DomainError('推荐码格式错误');
+    }
+  }
+
+  static generate(): ReferralCode {
+    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+    let code = '';
+    for (let i = 0; i < 6; i++) {
+      code += chars.charAt(Math.floor(Math.random() * chars.length));
+    }
+    return new ReferralCode(code);
+  }
+
+  static create(value: string): ReferralCode {
+    return new ReferralCode(value.toUpperCase());
+  }
+
+  equals(other: ReferralCode): boolean {
+    return this.value === other.value;
+  }
+}
--- a/backend/services/identity-service/identity-service/src/infrastructure/external/blockchain/blockchain.module.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/external/blockchain/blockchain.module.ts
@ -0,0 +1,8 @@
+import { Module } from '@nestjs/common';
+import { WalletGeneratorServiceImpl } from './wallet-generator.service.impl';
+
+@Module({
+  providers: [WalletGeneratorServiceImpl],
+  exports: [WalletGeneratorServiceImpl],
+})
+export class BlockchainModule {}
--- a/backend/services/identity-service/identity-service/src/infrastructure/external/blockchain/wallet-generator.service.impl.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/external/blockchain/wallet-generator.service.impl.ts
@ -0,0 +1,53 @@
+import { Injectable } from '@nestjs/common';
+import { createHash } from 'crypto';
+import { WalletAddress } from '@/domain/entities/wallet-address.entity';
+import { ChainType, Mnemonic, UserId } from '@/domain/value-objects';
+
+@Injectable()
+export class WalletGeneratorServiceImpl {
+  generateWalletSystem(params: { userId: UserId; deviceId: string }): {
+    mnemonic: Mnemonic;
+    wallets: Map<ChainType, WalletAddress>;
+  } {
+    const mnemonic = Mnemonic.generate();
+    const encryptionKey = this.deriveEncryptionKey(params.deviceId, params.userId.value);
+
+    const wallets = new Map<ChainType, WalletAddress>();
+    const chains = [ChainType.KAVA, ChainType.DST, ChainType.BSC];
+
+    for (const chainType of chains) {
+      const wallet = WalletAddress.createFromMnemonic({
+        userId: params.userId,
+        chainType,
+        mnemonic,
+        encryptionKey,
+      });
+      wallets.set(chainType, wallet);
+    }
+
+    return { mnemonic, wallets };
+  }
+
+  recoverWalletSystem(params: { userId: UserId; mnemonic: Mnemonic; deviceId: string }): Map<ChainType, WalletAddress> {
+    const encryptionKey = this.deriveEncryptionKey(params.deviceId, params.userId.value);
+    const wallets = new Map<ChainType, WalletAddress>();
+    const chains = [ChainType.KAVA, ChainType.DST, ChainType.BSC];
+
+    for (const chainType of chains) {
+      const wallet = WalletAddress.createFromMnemonic({
+        userId: params.userId,
+        chainType,
+        mnemonic: params.mnemonic,
+        encryptionKey,
+      });
+      wallets.set(chainType, wallet);
+    }
+
+    return wallets;
+  }
+
+  private deriveEncryptionKey(deviceId: string, userId: string): string {
+    const input = `${deviceId}:${userId}`;
+    return createHash('sha256').update(input).digest('hex');
+  }
+}
--- a/backend/services/identity-service/identity-service/src/infrastructure/external/sms/sms.module.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/external/sms/sms.module.ts
@ -0,0 +1,8 @@
+import { Module } from '@nestjs/common';
+import { SmsService } from './sms.service';
+
+@Module({
+  providers: [SmsService],
+  exports: [SmsService],
+})
+export class SmsModule {}
--- a/backend/services/identity-service/identity-service/src/infrastructure/external/sms/sms.service.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/external/sms/sms.service.ts
@ -0,0 +1,23 @@
+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+
+@Injectable()
+export class SmsService {
+  constructor(private readonly configService: ConfigService) {}
+
+  async sendSms(phoneNumber: string, content: string): Promise<boolean> {
+    const apiUrl = this.configService.get<string>('SMS_API_URL');
+    const apiKey = this.configService.get<string>('SMS_API_KEY');
+
+    // 实际项目中调用SMS API
+    console.log(`[SMS] Sending to ${phoneNumber}: ${content}`);
+    
+    // 模拟发送成功
+    return true;
+  }
+
+  async sendVerificationCode(phoneNumber: string, code: string): Promise<boolean> {
+    const content = `您的验证码是${code},5分钟内有效。`;
+    return this.sendSms(phoneNumber, content);
+  }
+}
--- a/backend/services/identity-service/identity-service/src/infrastructure/infrastructure.module.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/infrastructure.module.ts
@ -0,0 +1,31 @@
+import { Module, Global } from '@nestjs/common';
+import { PrismaService } from './persistence/prisma/prisma.service';
+import { UserAccountRepositoryImpl } from './persistence/repositories/user-account.repository.impl';
+import { UserAccountMapper } from './persistence/mappers/user-account.mapper';
+import { RedisService } from './redis/redis.service';
+import { EventPublisherService } from './kafka/event-publisher.service';
+import { SmsService } from './external/sms/sms.service';
+import { WalletGeneratorServiceImpl } from './external/blockchain/wallet-generator.service.impl';
+
+@Global()
+@Module({
+  providers: [
+    PrismaService,
+    UserAccountRepositoryImpl,
+    UserAccountMapper,
+    RedisService,
+    EventPublisherService,
+    SmsService,
+    WalletGeneratorServiceImpl,
+  ],
+  exports: [
+    PrismaService,
+    UserAccountRepositoryImpl,
+    UserAccountMapper,
+    RedisService,
+    EventPublisherService,
+    SmsService,
+    WalletGeneratorServiceImpl,
+  ],
+})
+export class InfrastructureModule {}
--- a/backend/services/identity-service/identity-service/src/infrastructure/kafka/event-publisher.service.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/kafka/event-publisher.service.ts
@ -0,0 +1,53 @@
+import { Injectable, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { Kafka, Producer, Consumer, logLevel } from 'kafkajs';
+import { DomainEvent } from '@/domain/events';
+
+@Injectable()
+export class EventPublisherService implements OnModuleInit, OnModuleDestroy {
+  private kafka: Kafka;
+  private producer: Producer;
+
+  constructor(private readonly configService: ConfigService) {
+    this.kafka = new Kafka({
+      clientId: this.configService.get<string>('KAFKA_CLIENT_ID', 'identity-service'),
+      brokers: (this.configService.get<string>('KAFKA_BROKERS', 'localhost:9092')).split(','),
+      logLevel: logLevel.WARN,
+    });
+    this.producer = this.kafka.producer();
+  }
+
+  async onModuleInit() {
+    await this.producer.connect();
+  }
+
+  async onModuleDestroy() {
+    await this.producer.disconnect();
+  }
+
+  async publish(event: DomainEvent): Promise<void> {
+    await this.producer.send({
+      topic: `identity.${event.eventType}`,
+      messages: [
+        {
+          key: event.eventId,
+          value: JSON.stringify({
+            eventId: event.eventId,
+            eventType: event.eventType,
+            occurredAt: event.occurredAt.toISOString(),
+            payload: (event as any).payload,
+          }),
+        },
+      ],
+    });
+  }
+
+  async publishAll(events: DomainEvent[]): Promise<void> {
+    for (const event of events) {
+      await this.publish(event);
+    }
+  }
+}
+
+@Injectable()
+export class KafkaModule {}
--- a/backend/services/identity-service/identity-service/src/infrastructure/kafka/kafka.module.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/kafka/kafka.module.ts
@ -0,0 +1,8 @@
+import { Module } from '@nestjs/common';
+import { EventPublisherService } from './event-publisher.service';
+
+@Module({
+  providers: [EventPublisherService],
+  exports: [EventPublisherService],
+})
+export class KafkaModule {}
--- a/backend/services/identity-service/identity-service/src/infrastructure/persistence/entities/user-account.entity.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/persistence/entities/user-account.entity.ts
@ -0,0 +1,44 @@
+// Prisma Entity Types - 用于Mapper转换
+export interface UserAccountEntity {
+  userId: bigint;
+  accountSequence: bigint;
+  phoneNumber: string | null;
+  nickname: string;
+  avatarUrl: string | null;
+  inviterSequence: bigint | null;
+  referralCode: string;
+  provinceCode: string;
+  cityCode: string;
+  address: string | null;
+  kycStatus: string;
+  realName: string | null;
+  idCardNumber: string | null;
+  idCardFrontUrl: string | null;
+  idCardBackUrl: string | null;
+  kycVerifiedAt: Date | null;
+  status: string;
+  registeredAt: Date;
+  lastLoginAt: Date | null;
+  updatedAt: Date;
+  devices?: UserDeviceEntity[];
+  walletAddresses?: WalletAddressEntity[];
+}
+
+export interface UserDeviceEntity {
+  id: bigint;
+  userId: bigint;
+  deviceId: string;
+  deviceName: string | null;
+  addedAt: Date;
+  lastActiveAt: Date;
+}
+
+export interface WalletAddressEntity {
+  addressId: bigint;
+  userId: bigint;
+  chainType: string;
+  address: string;
+  encryptedMnemonic: string | null;
+  status: string;
+  boundAt: Date;
+}
--- a/backend/services/identity-service/identity-service/src/infrastructure/persistence/entities/user-device.entity.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/persistence/entities/user-device.entity.ts
@ -0,0 +1,8 @@
+export interface UserDeviceEntity {
+  id: bigint;
+  userId: bigint;
+  deviceId: string;
+  deviceName: string | null;
+  addedAt: Date;
+  lastActiveAt: Date;
+}
--- a/backend/services/identity-service/identity-service/src/infrastructure/persistence/entities/wallet-address.entity.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/persistence/entities/wallet-address.entity.ts
@ -0,0 +1,9 @@
+export interface WalletAddressEntity {
+  addressId: bigint;
+  userId: bigint;
+  chainType: string;
+  address: string;
+  encryptedMnemonic: string | null;
+  status: string;
+  boundAt: Date;
+}
--- a/backend/services/identity-service/identity-service/src/infrastructure/persistence/mappers/user-account.mapper.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/persistence/mappers/user-account.mapper.ts
@ -0,0 +1,57 @@
+import { Injectable } from '@nestjs/common';
+import { UserAccount } from '@/domain/aggregates/user-account/user-account.aggregate';
+import { WalletAddress } from '@/domain/entities/wallet-address.entity';
+import { DeviceInfo, KYCInfo, KYCStatus, AccountStatus, ChainType, AddressStatus } from '@/domain/value-objects';
+import { UserAccountEntity } from '../entities/user-account.entity';
+
+@Injectable()
+export class UserAccountMapper {
+  toDomain(entity: UserAccountEntity): UserAccount {
+    const devices = (entity.devices || []).map(
+      (d) => new DeviceInfo(d.deviceId, d.deviceName || '未命名设备', d.addedAt, d.lastActiveAt),
+    );
+
+    const wallets = (entity.walletAddresses || []).map((w) =>
+      WalletAddress.reconstruct({
+        addressId: w.addressId.toString(),
+        userId: w.userId.toString(),
+        chainType: w.chainType as ChainType,
+        address: w.address,
+        encryptedMnemonic: w.encryptedMnemonic || '',
+        status: w.status as AddressStatus,
+        boundAt: w.boundAt,
+      }),
+    );
+
+    const kycInfo =
+      entity.realName && entity.idCardNumber
+        ? KYCInfo.create({
+            realName: entity.realName,
+            idCardNumber: entity.idCardNumber,
+            idCardFrontUrl: entity.idCardFrontUrl || '',
+            idCardBackUrl: entity.idCardBackUrl || '',
+          })
+        : null;
+
+    return UserAccount.reconstruct({
+      userId: entity.userId.toString(),
+      accountSequence: Number(entity.accountSequence),
+      devices,
+      phoneNumber: entity.phoneNumber,
+      nickname: entity.nickname,
+      avatarUrl: entity.avatarUrl,
+      inviterSequence: entity.inviterSequence ? Number(entity.inviterSequence) : null,
+      referralCode: entity.referralCode,
+      province: entity.provinceCode,
+      city: entity.cityCode,
+      address: entity.address,
+      walletAddresses: wallets,
+      kycInfo,
+      kycStatus: entity.kycStatus as KYCStatus,
+      status: entity.status as AccountStatus,
+      registeredAt: entity.registeredAt,
+      lastLoginAt: entity.lastLoginAt,
+      updatedAt: entity.updatedAt,
+    });
+  }
+}
--- a/backend/services/identity-service/identity-service/src/infrastructure/persistence/prisma/migrations/.gitkeep
+++ b/backend/services/identity-service/identity-service/src/infrastructure/persistence/prisma/migrations/.gitkeep
@ -0,0 +1 @@
+# Prisma migrations will be stored here
--- a/backend/services/identity-service/identity-service/src/infrastructure/persistence/prisma/prisma.service.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/persistence/prisma/prisma.service.ts
@ -0,0 +1,13 @@
+import { Injectable, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
+import { PrismaClient } from '@prisma/client';
+
+@Injectable()
+export class PrismaService extends PrismaClient implements OnModuleInit, OnModuleDestroy {
+  async onModuleInit() {
+    await this.$connect();
+  }
+
+  async onModuleDestroy() {
+    await this.$disconnect();
+  }
+}
--- a/backend/services/identity-service/identity-service/src/infrastructure/persistence/prisma/schema.prisma
+++ b/backend/services/identity-service/identity-service/src/infrastructure/persistence/prisma/schema.prisma
@ -0,0 +1,133 @@
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model UserAccount {
+  userId          BigInt   @id @default(autoincrement()) @map("user_id")
+  accountSequence BigInt   @unique @map("account_sequence")
+  
+  phoneNumber     String?  @unique @map("phone_number") @db.VarChar(20)
+  nickname        String   @db.VarChar(100)
+  avatarUrl       String?  @map("avatar_url") @db.VarChar(500)
+  
+  inviterSequence BigInt?  @map("inviter_sequence")
+  referralCode    String   @unique @map("referral_code") @db.VarChar(10)
+  
+  provinceCode    String   @map("province_code") @db.VarChar(10)
+  cityCode        String   @map("city_code") @db.VarChar(10)
+  address         String?  @db.VarChar(500)
+  
+  kycStatus       String   @default("NOT_VERIFIED") @map("kyc_status") @db.VarChar(20)
+  realName        String?  @map("real_name") @db.VarChar(100)
+  idCardNumber    String?  @map("id_card_number") @db.VarChar(20)
+  idCardFrontUrl  String?  @map("id_card_front_url") @db.VarChar(500)
+  idCardBackUrl   String?  @map("id_card_back_url") @db.VarChar(500)
+  kycVerifiedAt   DateTime? @map("kyc_verified_at")
+  
+  status          String   @default("ACTIVE") @db.VarChar(20)
+  
+  registeredAt    DateTime @default(now()) @map("registered_at")
+  lastLoginAt     DateTime? @map("last_login_at")
+  updatedAt       DateTime @updatedAt @map("updated_at")
+  
+  devices         UserDevice[]
+  walletAddresses WalletAddress[]
+  
+  @@index([phoneNumber], name: "idx_phone")
+  @@index([accountSequence], name: "idx_sequence")
+  @@index([referralCode], name: "idx_referral_code")
+  @@index([inviterSequence], name: "idx_inviter")
+  @@index([provinceCode, cityCode], name: "idx_province_city")
+  @@index([kycStatus], name: "idx_kyc_status")
+  @@index([status], name: "idx_status")
+  @@map("user_accounts")
+}
+
+model UserDevice {
+  id           BigInt   @id @default(autoincrement())
+  userId       BigInt   @map("user_id")
+  deviceId     String   @map("device_id") @db.VarChar(100)
+  deviceName   String?  @map("device_name") @db.VarChar(100)
+  
+  addedAt      DateTime @default(now()) @map("added_at")
+  lastActiveAt DateTime @default(now()) @map("last_active_at")
+  
+  user         UserAccount @relation(fields: [userId], references: [userId], onDelete: Cascade)
+  
+  @@unique([userId, deviceId], name: "uk_user_device")
+  @@index([deviceId], name: "idx_device")
+  @@index([userId], name: "idx_user")
+  @@index([lastActiveAt], name: "idx_last_active")
+  @@map("user_devices")
+}
+
+model WalletAddress {
+  addressId         BigInt   @id @default(autoincrement()) @map("address_id")
+  userId            BigInt   @map("user_id")
+  
+  chainType         String   @map("chain_type") @db.VarChar(20)
+  address           String   @db.VarChar(100)
+  
+  encryptedMnemonic String?  @map("encrypted_mnemonic") @db.Text
+  
+  status            String   @default("ACTIVE") @db.VarChar(20)
+  
+  boundAt           DateTime @default(now()) @map("bound_at")
+  
+  user              UserAccount @relation(fields: [userId], references: [userId], onDelete: Cascade)
+  
+  @@unique([userId, chainType], name: "uk_user_chain")
+  @@unique([chainType, address], name: "uk_chain_address")
+  @@index([userId], name: "idx_wallet_user")
+  @@index([address], name: "idx_address")
+  @@map("wallet_addresses")
+}
+
+model AccountSequenceGenerator {
+  id              Int      @id @default(1)
+  currentSequence BigInt   @default(0) @map("current_sequence")
+  updatedAt       DateTime @updatedAt @map("updated_at")
+  
+  @@map("account_sequence_generator")
+}
+
+model UserEvent {
+  eventId       BigInt   @id @default(autoincrement()) @map("event_id")
+  eventType     String   @map("event_type") @db.VarChar(50)
+  
+  aggregateId   String   @map("aggregate_id") @db.VarChar(100)
+  aggregateType String   @map("aggregate_type") @db.VarChar(50)
+  
+  eventData     Json     @map("event_data")
+  
+  userId        BigInt?  @map("user_id")
+  occurredAt    DateTime @default(now()) @map("occurred_at") @db.Timestamp(6)
+  version       Int      @default(1)
+  
+  @@index([aggregateType, aggregateId], name: "idx_aggregate")
+  @@index([eventType], name: "idx_event_type")
+  @@index([userId], name: "idx_event_user")
+  @@index([occurredAt], name: "idx_occurred")
+  @@map("user_events")
+}
+
+model DeviceToken {
+  id               BigInt    @id @default(autoincrement())
+  userId           BigInt    @map("user_id")
+  deviceId         String    @map("device_id") @db.VarChar(100)
+  
+  refreshTokenHash String    @unique @map("refresh_token_hash") @db.VarChar(64)
+  
+  expiresAt        DateTime  @map("expires_at")
+  createdAt        DateTime  @default(now()) @map("created_at")
+  revokedAt        DateTime? @map("revoked_at")
+  
+  @@index([userId, deviceId], name: "idx_user_device_token")
+  @@index([expiresAt], name: "idx_expires")
+  @@map("device_tokens")
+}
--- a/backend/services/identity-service/identity-service/src/infrastructure/persistence/repositories/user-account.repository.impl.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/persistence/repositories/user-account.repository.impl.ts
@ -0,0 +1,233 @@
+import { Injectable } from '@nestjs/common';
+import { PrismaService } from '@/infrastructure/persistence/prisma/prisma.service';
+import { UserAccountRepository, Pagination } from '@/domain/repositories/user-account.repository.interface';
+import { UserAccount } from '@/domain/aggregates/user-account/user-account.aggregate';
+import { WalletAddress } from '@/domain/entities/wallet-address.entity';
+import {
+  UserId, AccountSequence, PhoneNumber, ReferralCode, ChainType,
+  AccountStatus, KYCStatus, DeviceInfo, KYCInfo, AddressStatus,
+} from '@/domain/value-objects';
+
+@Injectable()
+export class UserAccountRepositoryImpl implements UserAccountRepository {
+  constructor(private readonly prisma: PrismaService) {}
+
+  async save(account: UserAccount): Promise<void> {
+    const devices = account.getAllDevices();
+    const wallets = account.getAllWalletAddresses();
+
+    await this.prisma.$transaction(async (tx) => {
+      await tx.userAccount.upsert({
+        where: { userId: BigInt(account.userId.value) },
+        create: {
+          userId: BigInt(account.userId.value),
+          accountSequence: BigInt(account.accountSequence.value),
+          phoneNumber: account.phoneNumber?.value || null,
+          nickname: account.nickname,
+          avatarUrl: account.avatarUrl,
+          inviterSequence: account.inviterSequence ? BigInt(account.inviterSequence.value) : null,
+          referralCode: account.referralCode.value,
+          provinceCode: account.province.value,
+          cityCode: account.city.value,
+          address: account.addressDetail,
+          kycStatus: account.kycStatus,
+          realName: account.kycInfo?.realName || null,
+          idCardNumber: account.kycInfo?.idCardNumber || null,
+          idCardFrontUrl: account.kycInfo?.idCardFrontUrl || null,
+          idCardBackUrl: account.kycInfo?.idCardBackUrl || null,
+          status: account.status,
+          registeredAt: account.registeredAt,
+          lastLoginAt: account.lastLoginAt,
+        },
+        update: {
+          phoneNumber: account.phoneNumber?.value || null,
+          nickname: account.nickname,
+          avatarUrl: account.avatarUrl,
+          provinceCode: account.province.value,
+          cityCode: account.city.value,
+          address: account.addressDetail,
+          kycStatus: account.kycStatus,
+          realName: account.kycInfo?.realName || null,
+          idCardNumber: account.kycInfo?.idCardNumber || null,
+          idCardFrontUrl: account.kycInfo?.idCardFrontUrl || null,
+          idCardBackUrl: account.kycInfo?.idCardBackUrl || null,
+          status: account.status,
+          lastLoginAt: account.lastLoginAt,
+        },
+      });
+
+      // Sync devices
+      await tx.userDevice.deleteMany({ where: { userId: BigInt(account.userId.value) } });
+      if (devices.length > 0) {
+        await tx.userDevice.createMany({
+          data: devices.map((d) => ({
+            userId: BigInt(account.userId.value),
+            deviceId: d.deviceId,
+            deviceName: d.deviceName,
+            addedAt: d.addedAt,
+            lastActiveAt: d.lastActiveAt,
+          })),
+        });
+      }
+    });
+  }
+
+  async saveWallets(userId: UserId, wallets: WalletAddress[]): Promise<void> {
+    await this.prisma.walletAddress.createMany({
+      data: wallets.map((w) => ({
+        userId: BigInt(userId.value),
+        chainType: w.chainType,
+        address: w.address,
+        encryptedMnemonic: w.encryptedMnemonic,
+        status: w.status,
+        boundAt: w.boundAt,
+      })),
+      skipDuplicates: true,
+    });
+  }
+
+  async findById(userId: UserId): Promise<UserAccount | null> {
+    const data = await this.prisma.userAccount.findUnique({
+      where: { userId: BigInt(userId.value) },
+      include: { devices: true, walletAddresses: true },
+    });
+    return data ? this.toDomain(data) : null;
+  }
+
+  async findByAccountSequence(sequence: AccountSequence): Promise<UserAccount | null> {
+    const data = await this.prisma.userAccount.findUnique({
+      where: { accountSequence: BigInt(sequence.value) },
+      include: { devices: true, walletAddresses: true },
+    });
+    return data ? this.toDomain(data) : null;
+  }
+
+  async findByDeviceId(deviceId: string): Promise<UserAccount | null> {
+    const device = await this.prisma.userDevice.findFirst({ where: { deviceId } });
+    if (!device) return null;
+    return this.findById(UserId.create(device.userId.toString()));
+  }
+
+  async findByPhoneNumber(phoneNumber: PhoneNumber): Promise<UserAccount | null> {
+    const data = await this.prisma.userAccount.findUnique({
+      where: { phoneNumber: phoneNumber.value },
+      include: { devices: true, walletAddresses: true },
+    });
+    return data ? this.toDomain(data) : null;
+  }
+
+  async findByReferralCode(referralCode: ReferralCode): Promise<UserAccount | null> {
+    const data = await this.prisma.userAccount.findUnique({
+      where: { referralCode: referralCode.value },
+      include: { devices: true, walletAddresses: true },
+    });
+    return data ? this.toDomain(data) : null;
+  }
+
+  async findByWalletAddress(chainType: ChainType, address: string): Promise<UserAccount | null> {
+    const wallet = await this.prisma.walletAddress.findUnique({
+      where: { uk_chain_address: { chainType, address } },
+    });
+    if (!wallet) return null;
+    return this.findById(UserId.create(wallet.userId.toString()));
+  }
+
+  async getMaxAccountSequence(): Promise<AccountSequence | null> {
+    const result = await this.prisma.userAccount.aggregate({ _max: { accountSequence: true } });
+    return result._max.accountSequence ? AccountSequence.create(Number(result._max.accountSequence)) : null;
+  }
+
+  async getNextAccountSequence(): Promise<AccountSequence> {
+    const result = await this.prisma.$transaction(async (tx) => {
+      const updated = await tx.accountSequenceGenerator.update({
+        where: { id: 1 },
+        data: { currentSequence: { increment: 1 } },
+      });
+      return updated.currentSequence;
+    });
+    return AccountSequence.create(Number(result));
+  }
+
+  async findUsers(
+    filters?: { status?: AccountStatus; kycStatus?: KYCStatus; province?: string; city?: string; keyword?: string },
+    pagination?: Pagination,
+  ): Promise<UserAccount[]> {
+    const where: any = {};
+    if (filters?.status) where.status = filters.status;
+    if (filters?.kycStatus) where.kycStatus = filters.kycStatus;
+    if (filters?.province) where.provinceCode = filters.province;
+    if (filters?.city) where.cityCode = filters.city;
+    if (filters?.keyword) {
+      where.OR = [
+        { nickname: { contains: filters.keyword } },
+        { phoneNumber: { contains: filters.keyword } },
+      ];
+    }
+
+    const data = await this.prisma.userAccount.findMany({
+      where,
+      include: { devices: true, walletAddresses: true },
+      skip: pagination ? (pagination.page - 1) * pagination.limit : undefined,
+      take: pagination?.limit,
+      orderBy: { registeredAt: 'desc' },
+    });
+
+    return data.map((d) => this.toDomain(d));
+  }
+
+  async countUsers(filters?: { status?: AccountStatus; kycStatus?: KYCStatus }): Promise<number> {
+    const where: any = {};
+    if (filters?.status) where.status = filters.status;
+    if (filters?.kycStatus) where.kycStatus = filters.kycStatus;
+    return this.prisma.userAccount.count({ where });
+  }
+
+  private toDomain(data: any): UserAccount {
+    const devices = data.devices.map(
+      (d: any) => new DeviceInfo(d.deviceId, d.deviceName || '未命名设备', d.addedAt, d.lastActiveAt),
+    );
+
+    const wallets = data.walletAddresses.map((w: any) =>
+      WalletAddress.reconstruct({
+        addressId: w.addressId.toString(),
+        userId: w.userId.toString(),
+        chainType: w.chainType as ChainType,
+        address: w.address,
+        encryptedMnemonic: w.encryptedMnemonic || '',
+        status: w.status as AddressStatus,
+        boundAt: w.boundAt,
+      }),
+    );
+
+    const kycInfo =
+      data.realName && data.idCardNumber
+        ? KYCInfo.create({
+            realName: data.realName,
+            idCardNumber: data.idCardNumber,
+            idCardFrontUrl: data.idCardFrontUrl || '',
+            idCardBackUrl: data.idCardBackUrl || '',
+          })
+        : null;
+
+    return UserAccount.reconstruct({
+      userId: data.userId.toString(),
+      accountSequence: Number(data.accountSequence),
+      devices,
+      phoneNumber: data.phoneNumber,
+      nickname: data.nickname,
+      avatarUrl: data.avatarUrl,
+      inviterSequence: data.inviterSequence ? Number(data.inviterSequence) : null,
+      referralCode: data.referralCode,
+      province: data.provinceCode,
+      city: data.cityCode,
+      address: data.address,
+      walletAddresses: wallets,
+      kycInfo,
+      kycStatus: data.kycStatus as KYCStatus,
+      status: data.status as AccountStatus,
+      registeredAt: data.registeredAt,
+      lastLoginAt: data.lastLoginAt,
+      updatedAt: data.updatedAt,
+    });
+  }
+}
--- a/backend/services/identity-service/identity-service/src/infrastructure/redis/redis.module.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/redis/redis.module.ts
@ -0,0 +1,8 @@
+import { Module } from '@nestjs/common';
+import { RedisService } from './redis.service';
+
+@Module({
+  providers: [RedisService],
+  exports: [RedisService],
+})
+export class RedisModule {}
--- a/backend/services/identity-service/identity-service/src/infrastructure/redis/redis.service.ts
+++ b/backend/services/identity-service/identity-service/src/infrastructure/redis/redis.service.ts
@ -0,0 +1,50 @@
+import { Injectable, OnModuleDestroy } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import Redis from 'ioredis';
+
+@Injectable()
+export class RedisService implements OnModuleDestroy {
+  private readonly client: Redis;
+
+  constructor(private readonly configService: ConfigService) {
+    this.client = new Redis({
+      host: this.configService.get<string>('REDIS_HOST', 'localhost'),
+      port: this.configService.get<number>('REDIS_PORT', 6379),
+      password: this.configService.get<string>('REDIS_PASSWORD') || undefined,
+      db: this.configService.get<number>('REDIS_DB', 0),
+    });
+  }
+
+  async get(key: string): Promise<string | null> {
+    return this.client.get(key);
+  }
+
+  async set(key: string, value: string, ttlSeconds?: number): Promise<void> {
+    if (ttlSeconds) {
+      await this.client.set(key, value, 'EX', ttlSeconds);
+    } else {
+      await this.client.set(key, value);
+    }
+  }
+
+  async delete(key: string): Promise<void> {
+    await this.client.del(key);
+  }
+
+  async exists(key: string): Promise<boolean> {
+    const result = await this.client.exists(key);
+    return result === 1;
+  }
+
+  async incr(key: string): Promise<number> {
+    return this.client.incr(key);
+  }
+
+  async expire(key: string, seconds: number): Promise<void> {
+    await this.client.expire(key, seconds);
+  }
+
+  onModuleDestroy() {
+    this.client.disconnect();
+  }
+}
--- a/backend/services/identity-service/identity-service/src/main.ts
+++ b/backend/services/identity-service/identity-service/src/main.ts
@ -0,0 +1,45 @@
+import { NestFactory } from '@nestjs/core';
+import { ValidationPipe } from '@nestjs/common';
+import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
+import { AppModule } from './app.module';
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+
+  // Global prefix
+  app.setGlobalPrefix('api/v1');
+
+  // Validation
+  app.useGlobalPipes(
+    new ValidationPipe({
+      whitelist: true,
+      forbidNonWhitelisted: true,
+      transform: true,
+      transformOptions: { enableImplicitConversion: true },
+    }),
+  );
+
+  // CORS
+  app.enableCors({
+    origin: '*',
+    methods: 'GET,HEAD,PUT,PATCH,POST,DELETE',
+    credentials: true,
+  });
+
+  // Swagger
+  const config = new DocumentBuilder()
+    .setTitle('Identity Service API')
+    .setDescription('RWA用户身份服务API')
+    .setVersion('2.0.0')
+    .addBearerAuth()
+    .build();
+  const document = SwaggerModule.createDocument(app, config);
+  SwaggerModule.setup('api/docs', app, document);
+
+  const port = process.env.APP_PORT || 3000;
+  await app.listen(port);
+  console.log(`Identity Service is running on port ${port}`);
+  console.log(`Swagger docs: http://localhost:${port}/api/docs`);
+}
+
+bootstrap();
--- a/backend/services/identity-service/identity-service/src/shared/decorators/current-user.decorator.ts
+++ b/backend/services/identity-service/identity-service/src/shared/decorators/current-user.decorator.ts
@ -0,0 +1,10 @@
+import { createParamDecorator, ExecutionContext } from '@nestjs/common';
+import { CurrentUserData } from '@/shared/guards/jwt-auth.guard';
+
+export const CurrentUser = createParamDecorator(
+  (data: keyof CurrentUserData | undefined, ctx: ExecutionContext): CurrentUserData | string | number => {
+    const request = ctx.switchToHttp().getRequest();
+    const user = request.user as CurrentUserData;
+    return data ? user?.[data] : user;
+  },
+);
--- a/backend/services/identity-service/identity-service/src/shared/decorators/public.decorator.ts
+++ b/backend/services/identity-service/identity-service/src/shared/decorators/public.decorator.ts
@ -0,0 +1,4 @@
+import { SetMetadata } from '@nestjs/common';
+
+export const IS_PUBLIC_KEY = 'isPublic';
+export const Public = () => SetMetadata(IS_PUBLIC_KEY, true);
--- a/backend/services/identity-service/identity-service/src/shared/exceptions/application.exception.ts
+++ b/backend/services/identity-service/identity-service/src/shared/exceptions/application.exception.ts
@ -0,0 +1,11 @@
+import { HttpException, HttpStatus } from '@nestjs/common';
+
+export class ApplicationException extends HttpException {
+  constructor(
+    message: string,
+    public readonly code?: string,
+    status: HttpStatus = HttpStatus.BAD_REQUEST,
+  ) {
+    super({ message, code, success: false }, status);
+  }
+}
--- a/backend/services/identity-service/identity-service/src/shared/exceptions/domain.exception.ts
+++ b/backend/services/identity-service/identity-service/src/shared/exceptions/domain.exception.ts
@ -0,0 +1,40 @@
+import { HttpException, HttpStatus } from '@nestjs/common';
+
+export class DomainError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'DomainError';
+  }
+}
+
+export class ApplicationError extends Error {
+  constructor(
+    message: string,
+    public readonly code?: string,
+  ) {
+    super(message);
+    this.name = 'ApplicationError';
+  }
+}
+
+export class BusinessException extends HttpException {
+  constructor(
+    message: string,
+    public readonly code?: string,
+    status: HttpStatus = HttpStatus.BAD_REQUEST,
+  ) {
+    super({ message, code, success: false }, status);
+  }
+}
+
+export class UnauthorizedException extends HttpException {
+  constructor(message: string = '未授权访问') {
+    super({ message, success: false }, HttpStatus.UNAUTHORIZED);
+  }
+}
+
+export class NotFoundException extends HttpException {
+  constructor(message: string = '资源不存在') {
+    super({ message, success: false }, HttpStatus.NOT_FOUND);
+  }
+}
--- a/backend/services/identity-service/identity-service/src/shared/filters/domain-exception.filter.ts
+++ b/backend/services/identity-service/identity-service/src/shared/filters/domain-exception.filter.ts
@ -0,0 +1,17 @@
+import { ExceptionFilter, Catch, ArgumentsHost, HttpStatus } from '@nestjs/common';
+import { Response } from 'express';
+import { DomainError } from '@/shared/exceptions/domain.exception';
+
+@Catch(DomainError)
+export class DomainExceptionFilter implements ExceptionFilter {
+  catch(exception: DomainError, host: ArgumentsHost) {
+    const ctx = host.switchToHttp();
+    const response = ctx.getResponse<Response>();
+
+    response.status(HttpStatus.BAD_REQUEST).json({
+      success: false,
+      message: exception.message,
+      timestamp: new Date().toISOString(),
+    });
+  }
+}
--- a/backend/services/identity-service/identity-service/src/shared/filters/global-exception.filter.ts
+++ b/backend/services/identity-service/identity-service/src/shared/filters/global-exception.filter.ts
@ -0,0 +1,65 @@
+import {
+  ExceptionFilter, Catch, ArgumentsHost, HttpException, HttpStatus,
+  Injectable, NestInterceptor, ExecutionContext, CallHandler,
+} from '@nestjs/common';
+import { Response } from 'express';
+import { Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+import { DomainError, ApplicationError } from '@/shared/exceptions/domain.exception';
+
+@Catch()
+export class GlobalExceptionFilter implements ExceptionFilter {
+  catch(exception: unknown, host: ArgumentsHost) {
+    const ctx = host.switchToHttp();
+    const response = ctx.getResponse<Response>();
+
+    let status = HttpStatus.INTERNAL_SERVER_ERROR;
+    let message = '服务器内部错误';
+    let code: string | undefined;
+
+    if (exception instanceof HttpException) {
+      status = exception.getStatus();
+      const exceptionResponse = exception.getResponse();
+      if (typeof exceptionResponse === 'object' && exceptionResponse !== null) {
+        message = (exceptionResponse as any).message || message;
+        code = (exceptionResponse as any).code;
+      } else {
+        message = exceptionResponse as string;
+      }
+    } else if (exception instanceof DomainError) {
+      status = HttpStatus.BAD_REQUEST;
+      message = exception.message;
+    } else if (exception instanceof ApplicationError) {
+      status = HttpStatus.BAD_REQUEST;
+      message = exception.message;
+      code = exception.code;
+    } else if (exception instanceof Error) {
+      message = exception.message;
+    }
+
+    response.status(status).json({
+      success: false,
+      code,
+      message,
+      timestamp: new Date().toISOString(),
+    });
+  }
+}
+
+export interface ApiResponse<T> {
+  success: boolean;
+  data?: T;
+  message?: string;
+}
+
+@Injectable()
+export class TransformInterceptor<T> implements NestInterceptor<T, ApiResponse<T>> {
+  intercept(context: ExecutionContext, next: CallHandler): Observable<ApiResponse<T>> {
+    return next.handle().pipe(
+      map((data) => ({
+        success: true,
+        data,
+      })),
+    );
+  }
+}
--- a/backend/services/identity-service/identity-service/src/shared/guards/jwt-auth.guard.ts
+++ b/backend/services/identity-service/identity-service/src/shared/guards/jwt-auth.guard.ts
@ -0,0 +1,68 @@
+import { Injectable, CanActivate, ExecutionContext, createParamDecorator, SetMetadata } from '@nestjs/common';
+import { Reflector } from '@nestjs/core';
+import { JwtService } from '@nestjs/jwt';
+import { UnauthorizedException } from '@/shared/exceptions/domain.exception';
+
+export interface JwtPayload {
+  userId: string;
+  accountSequence: number;
+  deviceId: string;
+  type: 'access' | 'refresh';
+}
+
+export interface CurrentUserData {
+  userId: string;
+  accountSequence: number;
+  deviceId: string;
+}
+
+export const IS_PUBLIC_KEY = 'isPublic';
+export const Public = () => SetMetadata(IS_PUBLIC_KEY, true);
+
+export const CurrentUser = createParamDecorator(
+  (data: keyof CurrentUserData | undefined, ctx: ExecutionContext): CurrentUserData | string | number => {
+    const request = ctx.switchToHttp().getRequest();
+    const user = request.user as CurrentUserData;
+    return data ? user?.[data] : user;
+  },
+);
+
+@Injectable()
+export class JwtAuthGuard implements CanActivate {
+  constructor(
+    private readonly jwtService: JwtService,
+    private readonly reflector: Reflector,
+  ) {}
+
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    const isPublic = this.reflector.getAllAndOverride<boolean>(IS_PUBLIC_KEY, [
+      context.getHandler(),
+      context.getClass(),
+    ]);
+    if (isPublic) return true;
+
+    const request = context.switchToHttp().getRequest();
+    const token = this.extractTokenFromHeader(request);
+
+    if (!token) throw new UnauthorizedException('缺少认证令牌');
+
+    try {
+      const payload = await this.jwtService.verifyAsync<JwtPayload>(token);
+      if (payload.type !== 'access') throw new UnauthorizedException('无效的令牌类型');
+      request.user = {
+        userId: payload.userId,
+        accountSequence: payload.accountSequence,
+        deviceId: payload.deviceId,
+      };
+    } catch {
+      throw new UnauthorizedException('令牌无效或已过期');
+    }
+
+    return true;
+  }
+
+  private extractTokenFromHeader(request: any): string | undefined {
+    const [type, token] = request.headers.authorization?.split(' ') ?? [];
+    return type === 'Bearer' ? token : undefined;
+  }
+}
--- a/backend/services/identity-service/identity-service/src/shared/interceptors/transform.interceptor.ts
+++ b/backend/services/identity-service/identity-service/src/shared/interceptors/transform.interceptor.ts
@ -0,0 +1,21 @@
+import { Injectable, NestInterceptor, ExecutionContext, CallHandler } from '@nestjs/common';
+import { Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+
+export interface ApiResponse<T> {
+  success: boolean;
+  data?: T;
+  message?: string;
+}
+
+@Injectable()
+export class TransformInterceptor<T> implements NestInterceptor<T, ApiResponse<T>> {
+  intercept(context: ExecutionContext, next: CallHandler): Observable<ApiResponse<T>> {
+    return next.handle().pipe(
+      map((data) => ({
+        success: true,
+        data,
+      })),
+    );
+  }
+}
--- a/backend/services/identity-service/identity-service/tsconfig.json
+++ b/backend/services/identity-service/identity-service/tsconfig.json
@ -0,0 +1,24 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "declaration": true,
+    "removeComments": true,
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "allowSyntheticDefaultImports": true,
+    "target": "ES2021",
+    "sourceMap": true,
+    "outDir": "./dist",
+    "baseUrl": "./",
+    "incremental": true,
+    "skipLibCheck": true,
+    "strictNullChecks": true,
+    "noImplicitAny": true,
+    "strictBindCallApply": true,
+    "forceConsistentCasingInFileNames": true,
+    "noFallthroughCasesInSwitch": true,
+    "paths": {
+      "@/*": ["src/*"]
+    }
+  }
+}
--- a/backend/services/identity-service/src/infrastructure/persistence/prisma/migrations/.gitkeep
+++ b/backend/services/identity-service/src/infrastructure/persistence/prisma/migrations/.gitkeep
@ -0,0 +1 @@
+# Prisma migrations will be stored here
--- a/backend/services/identity-service/src/infrastructure/persistence/prisma/schema.prisma
+++ b/backend/services/identity-service/src/infrastructure/persistence/prisma/schema.prisma
@ -0,0 +1,133 @@
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model UserAccount {
+  userId          BigInt   @id @default(autoincrement()) @map("user_id")
+  accountSequence BigInt   @unique @map("account_sequence")
+  
+  phoneNumber     String?  @unique @map("phone_number") @db.VarChar(20)
+  nickname        String   @db.VarChar(100)
+  avatarUrl       String?  @map("avatar_url") @db.VarChar(500)
+  
+  inviterSequence BigInt?  @map("inviter_sequence")
+  referralCode    String   @unique @map("referral_code") @db.VarChar(10)
+  
+  provinceCode    String   @map("province_code") @db.VarChar(10)
+  cityCode        String   @map("city_code") @db.VarChar(10)
+  address         String?  @db.VarChar(500)
+  
+  kycStatus       String   @default("NOT_VERIFIED") @map("kyc_status") @db.VarChar(20)
+  realName        String?  @map("real_name") @db.VarChar(100)
+  idCardNumber    String?  @map("id_card_number") @db.VarChar(20)
+  idCardFrontUrl  String?  @map("id_card_front_url") @db.VarChar(500)
+  idCardBackUrl   String?  @map("id_card_back_url") @db.VarChar(500)
+  kycVerifiedAt   DateTime? @map("kyc_verified_at")
+  
+  status          String   @default("ACTIVE") @db.VarChar(20)
+  
+  registeredAt    DateTime @default(now()) @map("registered_at")
+  lastLoginAt     DateTime? @map("last_login_at")
+  updatedAt       DateTime @updatedAt @map("updated_at")
+  
+  devices         UserDevice[]
+  walletAddresses WalletAddress[]
+  
+  @@index([phoneNumber], name: "idx_phone")
+  @@index([accountSequence], name: "idx_sequence")
+  @@index([referralCode], name: "idx_referral_code")
+  @@index([inviterSequence], name: "idx_inviter")
+  @@index([provinceCode, cityCode], name: "idx_province_city")
+  @@index([kycStatus], name: "idx_kyc_status")
+  @@index([status], name: "idx_status")
+  @@map("user_accounts")
+}
+
+model UserDevice {
+  id           BigInt   @id @default(autoincrement())
+  userId       BigInt   @map("user_id")
+  deviceId     String   @map("device_id") @db.VarChar(100)
+  deviceName   String?  @map("device_name") @db.VarChar(100)
+  
+  addedAt      DateTime @default(now()) @map("added_at")
+  lastActiveAt DateTime @default(now()) @map("last_active_at")
+  
+  user         UserAccount @relation(fields: [userId], references: [userId], onDelete: Cascade)
+  
+  @@unique([userId, deviceId], name: "uk_user_device")
+  @@index([deviceId], name: "idx_device")
+  @@index([userId], name: "idx_user")
+  @@index([lastActiveAt], name: "idx_last_active")
+  @@map("user_devices")
+}
+
+model WalletAddress {
+  addressId         BigInt   @id @default(autoincrement()) @map("address_id")
+  userId            BigInt   @map("user_id")
+  
+  chainType         String   @map("chain_type") @db.VarChar(20)
+  address           String   @db.VarChar(100)
+  
+  encryptedMnemonic String?  @map("encrypted_mnemonic") @db.Text
+  
+  status            String   @default("ACTIVE") @db.VarChar(20)
+  
+  boundAt           DateTime @default(now()) @map("bound_at")
+  
+  user              UserAccount @relation(fields: [userId], references: [userId], onDelete: Cascade)
+  
+  @@unique([userId, chainType], name: "uk_user_chain")
+  @@unique([chainType, address], name: "uk_chain_address")
+  @@index([userId], name: "idx_wallet_user")
+  @@index([address], name: "idx_address")
+  @@map("wallet_addresses")
+}
+
+model AccountSequenceGenerator {
+  id              Int      @id @default(1)
+  currentSequence BigInt   @default(0) @map("current_sequence")
+  updatedAt       DateTime @updatedAt @map("updated_at")
+  
+  @@map("account_sequence_generator")
+}
+
+model UserEvent {
+  eventId       BigInt   @id @default(autoincrement()) @map("event_id")
+  eventType     String   @map("event_type") @db.VarChar(50)
+  
+  aggregateId   String   @map("aggregate_id") @db.VarChar(100)
+  aggregateType String   @map("aggregate_type") @db.VarChar(50)
+  
+  eventData     Json     @map("event_data")
+  
+  userId        BigInt?  @map("user_id")
+  occurredAt    DateTime @default(now()) @map("occurred_at") @db.Timestamp(6)
+  version       Int      @default(1)
+  
+  @@index([aggregateType, aggregateId], name: "idx_aggregate")
+  @@index([eventType], name: "idx_event_type")
+  @@index([userId], name: "idx_event_user")
+  @@index([occurredAt], name: "idx_occurred")
+  @@map("user_events")
+}
+
+model DeviceToken {
+  id               BigInt    @id @default(autoincrement())
+  userId           BigInt    @map("user_id")
+  deviceId         String    @map("device_id") @db.VarChar(100)
+  
+  refreshTokenHash String    @unique @map("refresh_token_hash") @db.VarChar(64)
+  
+  expiresAt        DateTime  @map("expires_at")
+  createdAt        DateTime  @default(now()) @map("created_at")
+  revokedAt        DateTime? @map("revoked_at")
+  
+  @@index([userId, deviceId], name: "idx_user_device_token")
+  @@index([expiresAt], name: "idx_expires")
+  @@map("device_tokens")
+}