diff --git a/backend/services/blockchain-service/contracts/TestUSDT.sol b/backend/services/blockchain-service/contracts/TestUSDT.sol
new file mode 100644
index 00000000..2f4136e3
--- /dev/null
+++ b/backend/services/blockchain-service/contracts/TestUSDT.sol
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/access/Ownable.sol";
+
+/**
+ * @title TestUSDT
+ * @dev 测试网专用 USDT 代币，任何人都可以免费 mint
+ *
+ * 部署步骤:
+ * 1. 使用 Remix IDE (https://remix.ethereum.org)
+ * 2. 连接 MetaMask 到 BSC Testnet (Chain ID: 97) 或 KAVA Testnet (Chain ID: 2221)
+ * 3. 部署此合约
+ * 4. 调用 mint() 函数给自己铸造代币
+ */
+contract TestUSDT is ERC20, Ownable {
+    uint8 private _decimals;
+
+    constructor() ERC20("Test USDT", "USDT") Ownable(msg.sender) {
+        _decimals = 6; // USDT 标准是 6 位小数
+        // 初始铸造 1,000,000 USDT 给部署者
+        _mint(msg.sender, 1_000_000 * 10 ** _decimals);
+    }
+
+    function decimals() public view virtual override returns (uint8) {
+        return _decimals;
+    }
+
+    /**
+     * @dev 任何人都可以给自己 mint 代币 (仅限测试网使用!)
+     * @param amount 铸造数量 (注意: 需要乘以 10^6, 例如 1000 USDT = 1000000000)
+     */
+    function mint(uint256 amount) external {
+        _mint(msg.sender, amount);
+    }
+
+    /**
+     * @dev 便捷函数: 直接输入 USDT 数量，自动处理精度
+     * @param usdtAmount USDT 数量 (例如输入 1000 就是 1000 USDT)
+     */
+    function mintUsdt(uint256 usdtAmount) external {
+        _mint(msg.sender, usdtAmount * 10 ** _decimals);
+    }
+
+    /**
+     * @dev Owner 可以给任意地址 mint
+     */
+    function mintTo(address to, uint256 amount) external onlyOwner {
+        _mint(to, amount);
+    }
+
+    /**
+     * @dev 水龙头功能: 一次性领取 10000 USDT
+     */
+    function faucet() external {
+        _mint(msg.sender, 10_000 * 10 ** _decimals);
+    }
+}
diff --git a/backend/services/blockchain-service/contracts/TestUSDT_Flat.sol b/backend/services/blockchain-service/contracts/TestUSDT_Flat.sol
new file mode 100644
index 00000000..5ea7ea20
--- /dev/null
+++ b/backend/services/blockchain-service/contracts/TestUSDT_Flat.sol
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+/**
+ * @title TestUSDT (Flattened)
+ * @dev 测试网专用 USDT，可直接在 Remix 部署，无需额外依赖
+ *
+ * 部署网络:
+ * - BSC Testnet: Chain ID 97, RPC: https://data-seed-prebsc-1-s1.binance.org:8545
+ * - KAVA Testnet: Chain ID 2221, RPC: https://evm.testnet.kava.io
+ */
+
+abstract contract Context {
+    function _msgSender() internal view virtual returns (address) {
+        return msg.sender;
+    }
+}
+
+interface IERC20 {
+    event Transfer(address indexed from, address indexed to, uint256 value);
+    event Approval(address indexed owner, address indexed spender, uint256 value);
+    function totalSupply() external view returns (uint256);
+    function balanceOf(address account) external view returns (uint256);
+    function transfer(address to, uint256 value) external returns (bool);
+    function allowance(address owner, address spender) external view returns (uint256);
+    function approve(address spender, uint256 value) external returns (bool);
+    function transferFrom(address from, address to, uint256 value) external returns (bool);
+}
+
+interface IERC20Metadata is IERC20 {
+    function name() external view returns (string memory);
+    function symbol() external view returns (string memory);
+    function decimals() external view returns (uint8);
+}
+
+abstract contract ERC20 is Context, IERC20, IERC20Metadata {
+    mapping(address => uint256) private _balances;
+    mapping(address => mapping(address => uint256)) private _allowances;
+    uint256 private _totalSupply;
+    string private _name;
+    string private _symbol;
+
+    constructor(string memory name_, string memory symbol_) {
+        _name = name_;
+        _symbol = symbol_;
+    }
+
+    function name() public view virtual returns (string memory) { return _name; }
+    function symbol() public view virtual returns (string memory) { return _symbol; }
+    function decimals() public view virtual returns (uint8) { return 18; }
+    function totalSupply() public view virtual returns (uint256) { return _totalSupply; }
+    function balanceOf(address account) public view virtual returns (uint256) { return _balances[account]; }
+
+    function transfer(address to, uint256 value) public virtual returns (bool) {
+        _transfer(_msgSender(), to, value);
+        return true;
+    }
+
+    function allowance(address owner, address spender) public view virtual returns (uint256) {
+        return _allowances[owner][spender];
+    }
+
+    function approve(address spender, uint256 value) public virtual returns (bool) {
+        _approve(_msgSender(), spender, value);
+        return true;
+    }
+
+    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
+        address spender = _msgSender();
+        uint256 currentAllowance = allowance(from, spender);
+        if (currentAllowance != type(uint256).max) {
+            require(currentAllowance >= value, "ERC20: insufficient allowance");
+            unchecked { _approve(from, spender, currentAllowance - value); }
+        }
+        _transfer(from, to, value);
+        return true;
+    }
+
+    function _transfer(address from, address to, uint256 value) internal {
+        require(from != address(0), "ERC20: transfer from zero address");
+        require(to != address(0), "ERC20: transfer to zero address");
+        uint256 fromBalance = _balances[from];
+        require(fromBalance >= value, "ERC20: insufficient balance");
+        unchecked {
+            _balances[from] = fromBalance - value;
+            _balances[to] += value;
+        }
+        emit Transfer(from, to, value);
+    }
+
+    function _mint(address account, uint256 value) internal {
+        require(account != address(0), "ERC20: mint to zero address");
+        _totalSupply += value;
+        unchecked { _balances[account] += value; }
+        emit Transfer(address(0), account, value);
+    }
+
+    function _approve(address owner, address spender, uint256 value) internal {
+        require(owner != address(0) && spender != address(0), "ERC20: zero address");
+        _allowances[owner][spender] = value;
+        emit Approval(owner, spender, value);
+    }
+}
+
+contract TestUSDT is ERC20 {
+    uint8 private constant _decimals = 6;
+    address public owner;
+
+    modifier onlyOwner() {
+        require(msg.sender == owner, "Not owner");
+        _;
+    }
+
+    constructor() ERC20("Test USDT", "USDT") {
+        owner = msg.sender;
+        _mint(msg.sender, 1_000_000 * 10 ** _decimals);
+    }
+
+    function decimals() public pure override returns (uint8) {
+        return _decimals;
+    }
+
+    /// @dev 任何人可以 mint (测试网专用)
+    function mint(uint256 amount) external {
+        _mint(msg.sender, amount);
+    }
+
+    /// @dev 便捷函数: 输入 USDT 数量，自动处理精度
+    function mintUsdt(uint256 usdtAmount) external {
+        _mint(msg.sender, usdtAmount * 10 ** _decimals);
+    }
+
+    /// @dev Owner 给任意地址 mint
+    function mintTo(address to, uint256 amount) external onlyOwner {
+        _mint(to, amount);
+    }
+
+    /// @dev 水龙头: 一次领 10000 USDT
+    function faucet() external {
+        _mint(msg.sender, 10_000 * 10 ** _decimals);
+    }
+}
diff --git a/backend/services/blockchain-service/package-lock.json b/backend/services/blockchain-service/package-lock.json
index ec29cf38..525e9cc9 100644
--- a/backend/services/blockchain-service/package-lock.json
+++ b/backend/services/blockchain-service/package-lock.json
@@ -49,6 +49,7 @@
         "jest": "^29.5.0",
         "prettier": "^3.0.0",
         "prisma": "^5.7.0",
+        "solc": "^0.8.17",
         "source-map-support": "^0.5.21",
         "supertest": "^6.3.3",
         "ts-jest": "^29.1.0",
@@ -4087,6 +4088,13 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/command-exists": {
+      "version": "1.2.9",
+      "resolved": "https://registry.npmjs.org/command-exists/-/command-exists-1.2.9.tgz",
+      "integrity": "sha512-LTQ/SGc+s0Xc0Fu5WaKnR0YiygZkm9eKFvyS+fRsU7/ZWFF8ykFM6Pc9aCVf1+xasOOZpO3BAVgVrKvsqKHV7w==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/commander": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/commander/-/commander-4.1.1.tgz",
@@ -7053,6 +7061,13 @@
         "url": "https://github.com/chalk/supports-color?sponsor=1"
       }
     },
+    "node_modules/js-sha3": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/js-sha3/-/js-sha3-0.8.0.tgz",
+      "integrity": "sha512-gF1cRrHhIzNfToc802P800N8PpXS+evLLXfsVpowqmAFR9uwbi89WvXg2QspOmXL8QL86J4T1EpFu+yUkwJY3Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -7388,6 +7403,15 @@
         "node": ">= 4.0.0"
       }
     },
+    "node_modules/memorystream": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/memorystream/-/memorystream-0.3.1.tgz",
+      "integrity": "sha512-S3UwM3yj5mtUSEfP41UZmt/0SCoVYUcU1rkXv+BQ5Ig8ndL4sPoJNBUJERafdPb5jjHJGuMgytgKvKIf58XNBw==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.10.0"
+      }
+    },
     "node_modules/merge-descriptors": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.3.tgz",
@@ -8917,6 +8941,48 @@
         "node": ">=8"
       }
     },
+    "node_modules/solc": {
+      "version": "0.8.17",
+      "resolved": "https://registry.npmjs.org/solc/-/solc-0.8.17.tgz",
+      "integrity": "sha512-Dtidk2XtTTmkB3IKdyeg6wLYopJnBVxdoykN8oP8VY3PQjN16BScYoUJTXFm2OP7P0hXNAqWiJNmmfuELtLf8g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "command-exists": "^1.2.8",
+        "commander": "^8.1.0",
+        "follow-redirects": "^1.12.1",
+        "js-sha3": "0.8.0",
+        "memorystream": "^0.3.1",
+        "semver": "^5.5.0",
+        "tmp": "0.0.33"
+      },
+      "bin": {
+        "solcjs": "solc.js"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/solc/node_modules/commander": {
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-8.3.0.tgz",
+      "integrity": "sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 12"
+      }
+    },
+    "node_modules/solc/node_modules/semver": {
+      "version": "5.7.2",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.2.tgz",
+      "integrity": "sha512-cBznnQ9KjJqU67B52RMC65CMarK2600WFnbkcaiwWq3xy/5haFJlshgnpjovMVJ+Hff49d8GEn0b87C5pDQ10g==",
+      "dev": true,
+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver"
+      }
+    },
     "node_modules/source-map": {
       "version": "0.7.4",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.4.tgz",
diff --git a/backend/services/blockchain-service/package.json b/backend/services/blockchain-service/package.json
index ce7c29f7..2bb3006f 100644
--- a/backend/services/blockchain-service/package.json
+++ b/backend/services/blockchain-service/package.json
@@ -68,6 +68,7 @@
     "jest": "^29.5.0",
     "prettier": "^3.0.0",
     "prisma": "^5.7.0",
+    "solc": "^0.8.17",
     "source-map-support": "^0.5.21",
     "supertest": "^6.3.3",
     "ts-jest": "^29.1.0",
diff --git a/backend/services/blockchain-service/prisma/migrations/20241208000000_add_system_accounts_and_recovery/migration.sql b/backend/services/blockchain-service/prisma/migrations/20241208000000_add_system_accounts_and_recovery/migration.sql
new file mode 100644
index 00000000..14dd9afb
--- /dev/null
+++ b/backend/services/blockchain-service/prisma/migrations/20241208000000_add_system_accounts_and_recovery/migration.sql
@@ -0,0 +1,65 @@
+-- =============================================
+-- Migration: Add system accounts support and recovery mnemonics
+-- =============================================
+
+-- AlterTable: monitored_addresses
+-- Add new columns for system accounts and account_sequence
+ALTER TABLE "monitored_addresses" ADD COLUMN "address_type" VARCHAR(20) NOT NULL DEFAULT 'USER';
+ALTER TABLE "monitored_addresses" ADD COLUMN "account_sequence" BIGINT;
+ALTER TABLE "monitored_addresses" ADD COLUMN "system_account_type" VARCHAR(50);
+ALTER TABLE "monitored_addresses" ADD COLUMN "system_account_id" BIGINT;
+ALTER TABLE "monitored_addresses" ADD COLUMN "region_code" VARCHAR(10);
+
+-- Make user_id nullable (system accounts don't have user_id)
+ALTER TABLE "monitored_addresses" ALTER COLUMN "user_id" DROP NOT NULL;
+
+-- AlterTable: deposit_transactions
+-- Add new columns for system accounts and account_sequence
+ALTER TABLE "deposit_transactions" ADD COLUMN "address_type" VARCHAR(20) NOT NULL DEFAULT 'USER';
+ALTER TABLE "deposit_transactions" ADD COLUMN "account_sequence" BIGINT;
+ALTER TABLE "deposit_transactions" ADD COLUMN "system_account_type" VARCHAR(50);
+ALTER TABLE "deposit_transactions" ADD COLUMN "system_account_id" BIGINT;
+
+-- Make user_id nullable (system account deposits don't have user_id)
+ALTER TABLE "deposit_transactions" ALTER COLUMN "user_id" DROP NOT NULL;
+
+-- CreateTable: recovery_mnemonics
+CREATE TABLE "recovery_mnemonics" (
+    "id" BIGSERIAL NOT NULL,
+    "account_sequence" INTEGER NOT NULL,
+    "public_key" VARCHAR(130) NOT NULL,
+    "encrypted_mnemonic" TEXT NOT NULL,
+    "mnemonic_hash" VARCHAR(64) NOT NULL,
+    "status" VARCHAR(20) NOT NULL DEFAULT 'ACTIVE',
+    "is_backed_up" BOOLEAN NOT NULL DEFAULT false,
+    "revoked_at" TIMESTAMP(3),
+    "revoked_reason" VARCHAR(200),
+    "replaced_by_id" BIGINT,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "recovery_mnemonics_pkey" PRIMARY KEY ("id")
+);
+
+-- =============================================
+-- CreateIndex: monitored_addresses (new indexes)
+-- =============================================
+CREATE INDEX "idx_account_sequence" ON "monitored_addresses"("account_sequence");
+CREATE INDEX "idx_type_active" ON "monitored_addresses"("address_type", "is_active");
+CREATE INDEX "idx_system_account_type" ON "monitored_addresses"("system_account_type");
+
+-- Rename unique constraint to match schema
+DROP INDEX IF EXISTS "monitored_addresses_chain_type_address_key";
+CREATE UNIQUE INDEX "uk_chain_address" ON "monitored_addresses"("chain_type", "address");
+
+-- =============================================
+-- CreateIndex: deposit_transactions (new indexes)
+-- =============================================
+CREATE INDEX "idx_deposit_account" ON "deposit_transactions"("account_sequence");
+
+-- =============================================
+-- CreateIndex: recovery_mnemonics
+-- =============================================
+CREATE UNIQUE INDEX "uk_account_active_mnemonic" ON "recovery_mnemonics"("account_sequence", "status");
+CREATE INDEX "idx_recovery_account" ON "recovery_mnemonics"("account_sequence");
+CREATE INDEX "idx_recovery_public_key" ON "recovery_mnemonics"("public_key");
+CREATE INDEX "idx_recovery_status" ON "recovery_mnemonics"("status");
diff --git a/backend/services/blockchain-service/prisma/schema.prisma b/backend/services/blockchain-service/prisma/schema.prisma
index 4fa82cf1..ee4e2a16 100644
--- a/backend/services/blockchain-service/prisma/schema.prisma
+++ b/backend/services/blockchain-service/prisma/schema.prisma
@@ -12,7 +12,7 @@ datasource db {
 
 // ============================================
 // 监控地址表
-// 存储需要监听充值的地址
+// 存储需要监听充值的地址（用户地址和系统账户地址）
 // ============================================
 model MonitoredAddress {
   id        BigInt @id @default(autoincrement()) @map("address_id")
@@ -20,10 +20,17 @@ model MonitoredAddress {
   chainType String @map("chain_type") @db.VarChar(20) // KAVA, BSC
   address   String @db.VarChar(42) // 0x地址
 
-  // 使用 accountSequence 作为跨服务关联标识 (全局唯一业务ID)
-  accountSequence BigInt @map("account_sequence")
-  // 保留 userId 用于兼容，但主要使用 accountSequence
-  userId          BigInt @map("user_id")
+  // 地址类型: USER (用户钱包) 或 SYSTEM (系统账户)
+  addressType String @default("USER") @map("address_type") @db.VarChar(20)
+
+  // 用户地址关联 (addressType = USER 时使用)
+  accountSequence BigInt? @map("account_sequence") // 跨服务关联标识
+  userId          BigInt? @map("user_id") // 保留兼容
+
+  // 系统账户关联 (addressType = SYSTEM 时使用)
+  systemAccountType String? @map("system_account_type") @db.VarChar(50) // COST_ACCOUNT, OPERATION_ACCOUNT, etc.
+  systemAccountId   BigInt? @map("system_account_id")
+  regionCode        String? @map("region_code") @db.VarChar(10) // 省市代码（省市账户用）
 
   isActive Boolean @default(true) @map("is_active") // 是否激活监听
 
@@ -35,7 +42,9 @@ model MonitoredAddress {
   @@unique([chainType, address], name: "uk_chain_address")
   @@index([accountSequence], name: "idx_account_sequence")
   @@index([userId], name: "idx_user")
+  @@index([addressType, isActive], name: "idx_type_active")
   @@index([chainType, isActive], name: "idx_chain_active")
+  @@index([systemAccountType], name: "idx_system_account_type")
   @@map("monitored_addresses")
 }
 
@@ -66,8 +75,15 @@ model DepositTransaction {
 
   // 关联 - 使用 accountSequence 作为跨服务主键
   addressId       BigInt @map("address_id")
-  accountSequence BigInt @map("account_sequence") // 跨服务关联标识
-  userId          BigInt @map("user_id") // 保留兼容
+  addressType     String @default("USER") @map("address_type") @db.VarChar(20) // USER 或 SYSTEM
+
+  // 用户地址关联
+  accountSequence BigInt? @map("account_sequence") // 跨服务关联标识
+  userId          BigInt? @map("user_id") // 保留兼容
+
+  // 系统账户关联（当 addressType = SYSTEM 时）
+  systemAccountType String? @map("system_account_type") @db.VarChar(50)
+  systemAccountId   BigInt? @map("system_account_id")
 
   // 通知状态
   notifiedAt      DateTime? @map("notified_at")
diff --git a/backend/services/blockchain-service/scripts/deploy-kava-simple.ts b/backend/services/blockchain-service/scripts/deploy-kava-simple.ts
new file mode 100644
index 00000000..4e3d4902
--- /dev/null
+++ b/backend/services/blockchain-service/scripts/deploy-kava-simple.ts
@@ -0,0 +1,134 @@
+/**
+ * Deploy TestUSDT to KAVA Testnet using inline Solidity compilation
+ */
+import { ethers } from 'ethers';
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const solc = require('solc');
+
+const KAVA_TESTNET_RPC = 'https://evm.testnet.kava.io';
+const KAVA_TESTNET_CHAIN_ID = 2221;
+const privateKey = '0xd42a6e6021ebd884f3f179d3793a32e97b9f1001db6ff44441ec455d748b9aa6';
+
+const sourceCode = `
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.17;
+
+contract TestUSDT {
+    string public constant name = "Test USDT";
+    string public constant symbol = "USDT";
+    uint8 public constant decimals = 6;
+    uint256 public totalSupply;
+    mapping(address => uint256) public balanceOf;
+    mapping(address => mapping(address => uint256)) public allowance;
+
+    event Transfer(address indexed from, address indexed to, uint256 value);
+    event Approval(address indexed owner, address indexed spender, uint256 value);
+
+    constructor() {
+        _mint(msg.sender, 1000000 * 1e6);
+    }
+
+    function _mint(address to, uint256 amount) internal {
+        totalSupply += amount;
+        balanceOf[to] += amount;
+        emit Transfer(address(0), to, amount);
+    }
+
+    function transfer(address to, uint256 amount) public returns (bool) {
+        balanceOf[msg.sender] -= amount;
+        balanceOf[to] += amount;
+        emit Transfer(msg.sender, to, amount);
+        return true;
+    }
+
+    function approve(address spender, uint256 amount) public returns (bool) {
+        allowance[msg.sender][spender] = amount;
+        emit Approval(msg.sender, spender, amount);
+        return true;
+    }
+
+    function transferFrom(address from, address to, uint256 amount) public returns (bool) {
+        allowance[from][msg.sender] -= amount;
+        balanceOf[from] -= amount;
+        balanceOf[to] += amount;
+        emit Transfer(from, to, amount);
+        return true;
+    }
+
+    function mint(uint256 amount) external {
+        _mint(msg.sender, amount);
+    }
+
+    function faucet() external {
+        _mint(msg.sender, 10000 * 1e6);
+    }
+}
+`;
+
+async function deploy() {
+  console.log('🔨 Compiling contract...');
+
+  const input = {
+    language: 'Solidity',
+    sources: { 'TestUSDT.sol': { content: sourceCode } },
+    settings: { outputSelection: { '*': { '*': ['abi', 'evm.bytecode'] } } },
+  };
+
+  const output = JSON.parse(solc.compile(JSON.stringify(input)));
+
+  if (output.errors) {
+    const errors = output.errors.filter((e: any) => e.severity === 'error');
+    if (errors.length > 0) {
+      console.error('❌ Compilation errors:', errors);
+      process.exit(1);
+    }
+  }
+
+  const contract = output.contracts['TestUSDT.sol']['TestUSDT'];
+  const bytecode = contract.evm.bytecode.object;
+  const compiledAbi = contract.abi;
+
+  console.log('🌐 Connecting to KAVA Testnet...');
+  const provider = new ethers.JsonRpcProvider(KAVA_TESTNET_RPC, {
+    chainId: KAVA_TESTNET_CHAIN_ID,
+    name: 'kava-testnet',
+  });
+
+  const wallet = new ethers.Wallet(privateKey, provider);
+  console.log(`📍 Deployer: ${wallet.address}`);
+
+  const balance = await provider.getBalance(wallet.address);
+  console.log(`💰 Balance: ${ethers.formatEther(balance)} TKAVA`);
+
+  if (balance < ethers.parseEther('0.01')) {
+    console.error('❌ Insufficient TKAVA');
+    process.exit(1);
+  }
+
+  console.log('📦 Deploying...');
+  const factory = new ethers.ContractFactory(compiledAbi, bytecode, wallet);
+  const deployedContract = await factory.deploy({
+    gasLimit: 5000000,
+  });
+
+  console.log(`⏳ Waiting for confirmation...`);
+  console.log(`   TX: https://testnet.kavascan.com/tx/${deployedContract.deploymentTransaction()?.hash}`);
+
+  await deployedContract.waitForDeployment();
+
+  const address = await deployedContract.getAddress();
+  console.log('');
+  console.log('='.repeat(60));
+  console.log(`✅ SUCCESS! TestUSDT deployed on KAVA Testnet`);
+  console.log(`📋 Contract Address: ${address}`);
+  console.log('='.repeat(60));
+  console.log('');
+  console.log(`🔗 KavaScan: https://testnet.kavascan.com/address/${address}`);
+  console.log('');
+  console.log('Next: Update KAVA_USDT_CONTRACT in .env');
+}
+
+deploy().catch((e) => {
+  console.error('❌ Error:', e.message);
+  process.exit(1);
+});
diff --git a/backend/services/blockchain-service/scripts/deploy-test-usdt-kava.ts b/backend/services/blockchain-service/scripts/deploy-test-usdt-kava.ts
new file mode 100644
index 00000000..d1b591d3
--- /dev/null
+++ b/backend/services/blockchain-service/scripts/deploy-test-usdt-kava.ts
@@ -0,0 +1,106 @@
+/**
+ * Deploy TestUSDT to KAVA Testnet
+ *
+ * Usage:
+ *   npx ts-node scripts/deploy-test-usdt-kava.ts <PRIVATE_KEY>
+ *
+ * Example:
+ *   npx ts-node scripts/deploy-test-usdt-kava.ts 0xabc123...
+ *
+ * Get KAVA Testnet TKAVA from: https://faucet.kava.io
+ */
+
+import { ethers, ContractFactory } from 'ethers';
+
+// KAVA Testnet 配置
+const KAVA_TESTNET_RPC = 'https://evm.testnet.kava.io';
+const KAVA_TESTNET_CHAIN_ID = 2221;
+
+// TestUSDT 合约 ABI
+const CONTRACT_ABI = [
+  'constructor()',
+  'function name() view returns (string)',
+  'function symbol() view returns (string)',
+  'function decimals() view returns (uint8)',
+  'function totalSupply() view returns (uint256)',
+  'function balanceOf(address) view returns (uint256)',
+  'function transfer(address to, uint256 amount) returns (bool)',
+  'function approve(address spender, uint256 amount) returns (bool)',
+  'function allowance(address owner, address spender) view returns (uint256)',
+  'function transferFrom(address from, address to, uint256 amount) returns (bool)',
+  'function mint(uint256 amount)',
+  'function mintUsdt(uint256 usdtAmount)',
+  'function mintTo(address to, uint256 amount)',
+  'function faucet()',
+  'function owner() view returns (address)',
+  'event Transfer(address indexed from, address indexed to, uint256 value)',
+  'event Approval(address indexed owner, address indexed spender, uint256 value)',
+];
+
+// TestUSDT_Flat.sol 编译后的 bytecode
+const CONTRACT_BYTECODE = `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+
+async function main() {
+  const privateKey = process.argv[2];
+
+  if (!privateKey) {
+    console.error(`
+❌ Usage: npx ts-node scripts/deploy-test-usdt-kava.ts <PRIVATE_KEY>
+
+Steps:
+1. Get TKAVA from https://faucet.kava.io
+2. Export your private key from MetaMask
+3. Run: npx ts-node scripts/deploy-test-usdt-kava.ts 0xYourPrivateKey
+    `);
+    process.exit(1);
+  }
+
+  console.log('🚀 Deploying TestUSDT to KAVA Testnet...\n');
+
+  // 连接到 KAVA Testnet
+  const provider = new ethers.JsonRpcProvider(KAVA_TESTNET_RPC, {
+    chainId: KAVA_TESTNET_CHAIN_ID,
+    name: 'kava-testnet',
+  });
+
+  // 创建钱包
+  const wallet = new ethers.Wallet(privateKey, provider);
+  console.log(`📍 Deployer address: ${wallet.address}`);
+
+  // 检查余额
+  const balance = await provider.getBalance(wallet.address);
+  console.log(`💰 Balance: ${ethers.formatEther(balance)} TKAVA`);
+
+  if (balance < ethers.parseEther('0.01')) {
+    console.error('\n❌ Insufficient TKAVA. Get some from https://faucet.kava.io');
+    process.exit(1);
+  }
+
+  // 部署合约
+  console.log('\n📦 Deploying contract...');
+  const factory = new ContractFactory(CONTRACT_ABI, CONTRACT_BYTECODE, wallet);
+  const contract = await factory.deploy();
+
+  console.log(`⏳ Waiting for confirmation...`);
+  console.log(`   Transaction: https://testnet.kavascan.com/tx/${contract.deploymentTransaction()?.hash}`);
+
+  await contract.waitForDeployment();
+  const contractAddress = await contract.getAddress();
+
+  console.log(`
+✅ TestUSDT deployed successfully on KAVA Testnet!
+
+📋 Contract Address: ${contractAddress}
+🔗 KavaScan: https://testnet.kavascan.com/address/${contractAddress}
+
+Next steps:
+1. Update .env: KAVA_USDT_CONTRACT=${contractAddress}
+2. Call faucet() to mint 10,000 USDT for testing
+3. Or call mintUsdt(100000) to mint 100,000 USDT
+  `);
+}
+
+main().catch((error) => {
+  console.error('❌ Deployment failed:', error.message);
+  process.exit(1);
+});
diff --git a/backend/services/blockchain-service/scripts/deploy-test-usdt.ts b/backend/services/blockchain-service/scripts/deploy-test-usdt.ts
new file mode 100644
index 00000000..2bdd1292
--- /dev/null
+++ b/backend/services/blockchain-service/scripts/deploy-test-usdt.ts
@@ -0,0 +1,107 @@
+/**
+ * Deploy TestUSDT to BSC Testnet
+ *
+ * Usage:
+ *   npx ts-node scripts/deploy-test-usdt.ts <PRIVATE_KEY>
+ *
+ * Example:
+ *   npx ts-node scripts/deploy-test-usdt.ts 0xabc123...
+ *
+ * Get BSC Testnet tBNB from: https://www.bnbchain.org/en/testnet-faucet
+ */
+
+import { ethers, ContractFactory } from 'ethers';
+
+// BSC Testnet 配置
+const BSC_TESTNET_RPC = 'https://data-seed-prebsc-1-s1.binance.org:8545';
+const BSC_TESTNET_CHAIN_ID = 97;
+
+// TestUSDT 合约 ABI 和 Bytecode
+const CONTRACT_ABI = [
+  'constructor()',
+  'function name() view returns (string)',
+  'function symbol() view returns (string)',
+  'function decimals() view returns (uint8)',
+  'function totalSupply() view returns (uint256)',
+  'function balanceOf(address) view returns (uint256)',
+  'function transfer(address to, uint256 amount) returns (bool)',
+  'function approve(address spender, uint256 amount) returns (bool)',
+  'function allowance(address owner, address spender) view returns (uint256)',
+  'function transferFrom(address from, address to, uint256 amount) returns (bool)',
+  'function mint(uint256 amount)',
+  'function mintUsdt(uint256 usdtAmount)',
+  'function mintTo(address to, uint256 amount)',
+  'function faucet()',
+  'function owner() view returns (address)',
+  'event Transfer(address indexed from, address indexed to, uint256 value)',
+  'event Approval(address indexed owner, address indexed spender, uint256 value)',
+];
+
+// 编译后的 bytecode (TestUSDT_Flat.sol)
+const CONTRACT_BYTECODE =
+  '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';
+
+async function main() {
+  const privateKey = process.argv[2];
+
+  if (!privateKey) {
+    console.error(`
+❌ Usage: npx ts-node scripts/deploy-test-usdt.ts <PRIVATE_KEY>
+
+Steps:
+1. Get tBNB from https://www.bnbchain.org/en/testnet-faucet
+2. Export your private key from MetaMask
+3. Run: npx ts-node scripts/deploy-test-usdt.ts 0xYourPrivateKey
+    `);
+    process.exit(1);
+  }
+
+  console.log('🚀 Deploying TestUSDT to BSC Testnet...\n');
+
+  // 连接到 BSC Testnet
+  const provider = new ethers.JsonRpcProvider(BSC_TESTNET_RPC, {
+    chainId: BSC_TESTNET_CHAIN_ID,
+    name: 'bsc-testnet',
+  });
+
+  // 创建钱包
+  const wallet = new ethers.Wallet(privateKey, provider);
+  console.log(`📍 Deployer address: ${wallet.address}`);
+
+  // 检查余额
+  const balance = await provider.getBalance(wallet.address);
+  console.log(`💰 Balance: ${ethers.formatEther(balance)} tBNB`);
+
+  if (balance < ethers.parseEther('0.01')) {
+    console.error('\n❌ Insufficient tBNB. Get some from https://www.bnbchain.org/en/testnet-faucet');
+    process.exit(1);
+  }
+
+  // 部署合约
+  console.log('\n📦 Deploying contract...');
+  const factory = new ContractFactory(CONTRACT_ABI, CONTRACT_BYTECODE, wallet);
+  const contract = await factory.deploy();
+
+  console.log(`⏳ Waiting for confirmation...`);
+  console.log(`   Transaction: https://testnet.bscscan.com/tx/${contract.deploymentTransaction()?.hash}`);
+
+  await contract.waitForDeployment();
+  const contractAddress = await contract.getAddress();
+
+  console.log(`
+✅ TestUSDT deployed successfully!
+
+📋 Contract Address: ${contractAddress}
+🔗 BSCScan: https://testnet.bscscan.com/address/${contractAddress}
+
+Next steps:
+1. Update .env: BSC_USDT_CONTRACT=${contractAddress}
+2. Call faucet() to mint 10,000 USDT for testing
+3. Or call mintUsdt(100000) to mint 100,000 USDT
+  `);
+}
+
+main().catch((error) => {
+  console.error('❌ Deployment failed:', error.message);
+  process.exit(1);
+});
diff --git a/backend/services/blockchain-service/scripts/generate-wallet.ts b/backend/services/blockchain-service/scripts/generate-wallet.ts
new file mode 100644
index 00000000..b0ac3025
--- /dev/null
+++ b/backend/services/blockchain-service/scripts/generate-wallet.ts
@@ -0,0 +1,26 @@
+/**
+ * Generate a new wallet for BSC Testnet deployment
+ *
+ * Usage: npx ts-node scripts/generate-wallet.ts
+ */
+
+import { ethers } from 'ethers';
+
+const wallet = ethers.Wallet.createRandom();
+
+console.log(`
+🔐 New Wallet Generated for BSC Testnet
+========================================
+
+Address:     ${wallet.address}
+Private Key: ${wallet.privateKey}
+Mnemonic:    ${wallet.mnemonic?.phrase}
+
+Next steps:
+1. Go to https://www.bnbchain.org/en/testnet-faucet
+2. Paste your address: ${wallet.address}
+3. Get 0.1 tBNB
+4. Run: npx ts-node scripts/deploy-test-usdt.ts ${wallet.privateKey}
+
+⚠️  SAVE YOUR PRIVATE KEY! You'll need it for future contract interactions.
+`);
diff --git a/backend/services/blockchain-service/src/application/application.module.ts b/backend/services/blockchain-service/src/application/application.module.ts
index c980b96f..cfc09b94 100644
--- a/backend/services/blockchain-service/src/application/application.module.ts
+++ b/backend/services/blockchain-service/src/application/application.module.ts
@@ -7,7 +7,7 @@ import {
   BalanceQueryService,
   MnemonicVerificationService,
 } from './services';
-import { MpcKeygenCompletedHandler } from './event-handlers';
+import { MpcKeygenCompletedHandler, WithdrawalRequestedHandler } from './event-handlers';
 
 @Module({
   imports: [InfrastructureModule, DomainModule],
@@ -20,6 +20,7 @@ import { MpcKeygenCompletedHandler } from './event-handlers';
 
     // 事件处理器
     MpcKeygenCompletedHandler,
+    WithdrawalRequestedHandler,
   ],
   exports: [
     AddressDerivationService,
@@ -27,6 +28,7 @@ import { MpcKeygenCompletedHandler } from './event-handlers';
     BalanceQueryService,
     MnemonicVerificationService,
     MpcKeygenCompletedHandler,
+    WithdrawalRequestedHandler,
   ],
 })
 export class ApplicationModule {}
diff --git a/backend/services/blockchain-service/src/application/event-handlers/index.ts b/backend/services/blockchain-service/src/application/event-handlers/index.ts
index 92a915c1..7231998d 100644
--- a/backend/services/blockchain-service/src/application/event-handlers/index.ts
+++ b/backend/services/blockchain-service/src/application/event-handlers/index.ts
@@ -1 +1,2 @@
 export * from './mpc-keygen-completed.handler';
+export * from './withdrawal-requested.handler';
diff --git a/backend/services/blockchain-service/src/application/event-handlers/withdrawal-requested.handler.ts b/backend/services/blockchain-service/src/application/event-handlers/withdrawal-requested.handler.ts
new file mode 100644
index 00000000..f03222f5
--- /dev/null
+++ b/backend/services/blockchain-service/src/application/event-handlers/withdrawal-requested.handler.ts
@@ -0,0 +1,120 @@
+import { Injectable, Logger, OnModuleInit } from '@nestjs/common';
+import {
+  WithdrawalEventConsumerService,
+  WithdrawalRequestedPayload,
+} from '@/infrastructure/kafka/withdrawal-event-consumer.service';
+import { EventPublisherService } from '@/infrastructure/kafka/event-publisher.service';
+
+/**
+ * Withdrawal Requested Event Handler
+ *
+ * Handles withdrawal requests from wallet-service.
+ * For now, logs the event and publishes a status update.
+ *
+ * Future implementation will:
+ * 1. Create TransactionRequest record
+ * 2. Request MPC signing
+ * 3. Broadcast to blockchain
+ * 4. Monitor confirmation
+ */
+@Injectable()
+export class WithdrawalRequestedHandler implements OnModuleInit {
+  private readonly logger = new Logger(WithdrawalRequestedHandler.name);
+
+  constructor(
+    private readonly withdrawalEventConsumer: WithdrawalEventConsumerService,
+    private readonly eventPublisher: EventPublisherService,
+  ) {}
+
+  onModuleInit() {
+    this.withdrawalEventConsumer.onWithdrawalRequested(
+      this.handleWithdrawalRequested.bind(this),
+    );
+    this.logger.log(`[INIT] WithdrawalRequestedHandler registered`);
+  }
+
+  /**
+   * Handle withdrawal requested event from wallet-service
+   *
+   * Current implementation: Log and acknowledge
+   * TODO: Implement full blockchain transaction flow
+   */
+  private async handleWithdrawalRequested(
+    payload: WithdrawalRequestedPayload,
+  ): Promise<void> {
+    this.logger.log(`[HANDLE] Received WithdrawalRequested event`);
+    this.logger.log(`[HANDLE] orderNo: ${payload.orderNo}`);
+    this.logger.log(`[HANDLE] accountSequence: ${payload.accountSequence}`);
+    this.logger.log(`[HANDLE] userId: ${payload.userId}`);
+    this.logger.log(`[HANDLE] chainType: ${payload.chainType}`);
+    this.logger.log(`[HANDLE] toAddress: ${payload.toAddress}`);
+    this.logger.log(`[HANDLE] amount: ${payload.amount}`);
+    this.logger.log(`[HANDLE] fee: ${payload.fee}`);
+    this.logger.log(`[HANDLE] netAmount: ${payload.netAmount}`);
+
+    try {
+      // TODO: Full implementation steps:
+      // 1. Validate the withdrawal request
+      // 2. Get system hot wallet address for the chain
+      // 3. Create TransactionRequest record
+      // 4. Request MPC signing
+      // 5. After signed, broadcast to blockchain
+      // 6. Monitor for confirmation
+      // 7. Publish status updates back to wallet-service
+
+      // For now, just log that we received it
+      this.logger.log(
+        `[PROCESS] Withdrawal ${payload.orderNo} received for processing`,
+      );
+      this.logger.log(
+        `[PROCESS] Chain: ${payload.chainType}, To: ${payload.toAddress}, Amount: ${payload.netAmount} USDT`,
+      );
+
+      // Publish acknowledgment event (wallet-service can listen for status updates)
+      await this.eventPublisher.publish({
+        eventType: 'blockchain.withdrawal.received',
+        toPayload: () => ({
+          orderNo: payload.orderNo,
+          accountSequence: payload.accountSequence,
+          status: 'RECEIVED',
+          message: 'Withdrawal request received by blockchain-service',
+        }),
+        eventId: `wd-received-${payload.orderNo}-${Date.now()}`,
+        occurredAt: new Date(),
+      });
+
+      this.logger.log(
+        `[COMPLETE] Withdrawal ${payload.orderNo} acknowledged`,
+      );
+
+      // NOTE: Actual blockchain transaction implementation would go here
+      // This would involve:
+      // - Creating a TransactionRequest aggregate
+      // - Calling MPC service for signing
+      // - Broadcasting the signed transaction
+      // - Monitoring for confirmations
+      // - Publishing final status (CONFIRMED or FAILED)
+
+    } catch (error) {
+      this.logger.error(
+        `[ERROR] Failed to process withdrawal ${payload.orderNo}`,
+        error,
+      );
+
+      // Publish failure event
+      await this.eventPublisher.publish({
+        eventType: 'blockchain.withdrawal.failed',
+        toPayload: () => ({
+          orderNo: payload.orderNo,
+          accountSequence: payload.accountSequence,
+          status: 'FAILED',
+          error: error instanceof Error ? error.message : 'Unknown error',
+        }),
+        eventId: `wd-failed-${payload.orderNo}-${Date.now()}`,
+        occurredAt: new Date(),
+      });
+
+      throw error;
+    }
+  }
+}
diff --git a/backend/services/blockchain-service/src/application/services/address-derivation.service.ts b/backend/services/blockchain-service/src/application/services/address-derivation.service.ts
index 9b9893bb..6e07cd20 100644
--- a/backend/services/blockchain-service/src/application/services/address-derivation.service.ts
+++ b/backend/services/blockchain-service/src/application/services/address-derivation.service.ts
@@ -34,20 +34,20 @@ export interface DeriveAddressResult {
  * 处理从 MPC 公钥派生钱包地址的业务逻辑
  *
  * 派生策略：
- * - KAVA: Cosmos bech32 格式 (kava1...)
+ * - KAVA: EVM 格式 (0x...) - Kava EVM 兼容链
  * - DST: Cosmos bech32 格式 (dst1...)
  * - BSC: EVM 格式 (0x...)
  *
  * 监控策略：
- * - 只有 EVM 链 (BSC) 的地址会被注册到监控列表用于充值检测
- * - Cosmos 链 (KAVA, DST) 需要不同的监控机制
+ * - EVM 链 (BSC, KAVA) 的地址会被注册到监控列表用于充值检测
+ * - Cosmos 链 (DST) 需要不同的监控机制
  */
 @Injectable()
 export class AddressDerivationService {
   private readonly logger = new Logger(AddressDerivationService.name);
 
   // EVM 链类型列表，用于判断是否需要注册监控
-  private readonly evmChains = new Set([ChainTypeEnum.BSC]);
+  private readonly evmChains = new Set([ChainTypeEnum.BSC, ChainTypeEnum.KAVA]);
 
   constructor(
     private readonly addressDerivation: AddressDerivationAdapter,
diff --git a/backend/services/blockchain-service/src/application/services/deposit-detection.service.ts b/backend/services/blockchain-service/src/application/services/deposit-detection.service.ts
index 11ecb6c2..17ef02a1 100644
--- a/backend/services/blockchain-service/src/application/services/deposit-detection.service.ts
+++ b/backend/services/blockchain-service/src/application/services/deposit-detection.service.ts
@@ -125,7 +125,7 @@ export class DepositDetectionService implements OnModuleInit {
 
     const chainType = ChainType.fromEnum(event.chainType);
 
-    // 查找监控地址以获取用户ID
+    // 查找监控地址以获取用户ID或系统账户信息
     const monitoredAddress = await this.monitoredAddressRepo.findByChainAndAddress(
       chainType,
       EvmAddress.fromUnchecked(event.to),
@@ -136,7 +136,7 @@ export class DepositDetectionService implements OnModuleInit {
       return;
     }
 
-    // 创建充值记录 - 使用 accountSequence 作为跨服务关联键
+    // 创建充值记录 - 用户地址
     const deposit = DepositTransaction.create({
       chainType,
       txHash,
@@ -162,7 +162,7 @@ export class DepositDetectionService implements OnModuleInit {
     deposit.clearDomainEvents();
 
     this.logger.log(
-      `New deposit saved: ${txHash.toShort()} -> ${event.to} (${deposit.amount.formatted} USDT)`,
+      `User deposit saved: ${txHash.toShort()} -> ${event.to} (${deposit.amount.formatted} USDT)`,
     );
   }
 
diff --git a/backend/services/blockchain-service/src/config/blockchain.config.ts b/backend/services/blockchain-service/src/config/blockchain.config.ts
index aadc027f..c0178a53 100644
--- a/backend/services/blockchain-service/src/config/blockchain.config.ts
+++ b/backend/services/blockchain-service/src/config/blockchain.config.ts
@@ -31,8 +31,8 @@ export default registerAs('blockchain', () => {
           // KAVA Testnet
           rpcUrl: process.env.KAVA_RPC_URL || 'https://evm.testnet.kava.io',
           chainId: parseInt(process.env.KAVA_CHAIN_ID || '2221', 10),
-          // 测试网 USDT 合约 (需要部署或使用已有的)
-          usdtContract: process.env.KAVA_USDT_CONTRACT || '0x0000000000000000000000000000000000000000',
+          // 测试网 USDT 合约 (自定义部署的 TestUSDT)
+          usdtContract: process.env.KAVA_USDT_CONTRACT || '0xc12f6A4A7Fd0965085B044A67a39CcA2ff7fe0dF',
           confirmations: parseInt(process.env.KAVA_CONFIRMATIONS || '3', 10),
         }
       : {
diff --git a/backend/services/blockchain-service/src/infrastructure/blockchain/address-derivation.adapter.ts b/backend/services/blockchain-service/src/infrastructure/blockchain/address-derivation.adapter.ts
index 8eb01c2a..e673d0c6 100644
--- a/backend/services/blockchain-service/src/infrastructure/blockchain/address-derivation.adapter.ts
+++ b/backend/services/blockchain-service/src/infrastructure/blockchain/address-derivation.adapter.ts
@@ -147,13 +147,12 @@ export class AddressDerivationAdapter {
     const evmAddress = this.deriveEvmAddress(compressedPublicKey);
     this.logger.log(`[DERIVE] EVM address derived: ${evmAddress}`);
 
-    // KAVA (Cosmos bech32 格式 - kava1...)
-    const kavaAddress = this.deriveCosmosAddress(compressedPublicKey, 'kava');
+    // KAVA (EVM 格式 - 0x...) - Kava EVM 兼容链
     addresses.push({
       chainType: ChainTypeEnum.KAVA,
-      address: kavaAddress,
+      address: evmAddress,
     });
-    this.logger.log(`[DERIVE] KAVA address (Cosmos): ${kavaAddress}`);
+    this.logger.log(`[DERIVE] KAVA address (EVM): ${evmAddress}`);
 
     // DST (Cosmos bech32 格式 - dst1...)
     const dstAddress = this.deriveCosmosAddress(compressedPublicKey, 'dst');
diff --git a/backend/services/blockchain-service/src/infrastructure/infrastructure.module.ts b/backend/services/blockchain-service/src/infrastructure/infrastructure.module.ts
index ce4a17ee..e8b60d53 100644
--- a/backend/services/blockchain-service/src/infrastructure/infrastructure.module.ts
+++ b/backend/services/blockchain-service/src/infrastructure/infrastructure.module.ts
@@ -1,7 +1,7 @@
 import { Global, Module } from '@nestjs/common';
 import { PrismaService } from './persistence/prisma/prisma.service';
 import { RedisService, AddressCacheService } from './redis';
-import { EventPublisherService, MpcEventConsumerService } from './kafka';
+import { EventPublisherService, MpcEventConsumerService, WithdrawalEventConsumerService } from './kafka';
 import { EvmProviderAdapter, AddressDerivationAdapter, MnemonicDerivationAdapter, RecoveryMnemonicAdapter, BlockScannerService } from './blockchain';
 import { DomainModule } from '@/domain/domain.module';
 import {
@@ -26,6 +26,7 @@ import {
     RedisService,
     EventPublisherService,
     MpcEventConsumerService,
+    WithdrawalEventConsumerService,
 
     // 区块链适配器
     EvmProviderAdapter,
@@ -60,6 +61,7 @@ import {
     RedisService,
     EventPublisherService,
     MpcEventConsumerService,
+    WithdrawalEventConsumerService,
     EvmProviderAdapter,
     AddressDerivationAdapter,
     MnemonicDerivationAdapter,
diff --git a/backend/services/blockchain-service/src/infrastructure/kafka/index.ts b/backend/services/blockchain-service/src/infrastructure/kafka/index.ts
index 07da6b8d..460bc092 100644
--- a/backend/services/blockchain-service/src/infrastructure/kafka/index.ts
+++ b/backend/services/blockchain-service/src/infrastructure/kafka/index.ts
@@ -1,3 +1,4 @@
 export * from './event-publisher.service';
 export * from './event-consumer.controller';
 export * from './mpc-event-consumer.service';
+export * from './withdrawal-event-consumer.service';
diff --git a/backend/services/blockchain-service/src/infrastructure/kafka/withdrawal-event-consumer.service.ts b/backend/services/blockchain-service/src/infrastructure/kafka/withdrawal-event-consumer.service.ts
new file mode 100644
index 00000000..3ad6b11d
--- /dev/null
+++ b/backend/services/blockchain-service/src/infrastructure/kafka/withdrawal-event-consumer.service.ts
@@ -0,0 +1,147 @@
+/**
+ * Withdrawal Event Consumer Service for Blockchain Service
+ *
+ * Consumes withdrawal request events from wallet-service via Kafka.
+ * Creates transaction requests for MPC signing and blockchain broadcasting.
+ */
+
+import { Injectable, Logger, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { Kafka, Consumer, logLevel, EachMessagePayload } from 'kafkajs';
+
+export const WITHDRAWAL_TOPICS = {
+  WITHDRAWAL_REQUESTED: 'wallet.withdrawals',
+} as const;
+
+export interface WithdrawalRequestedPayload {
+  orderNo: string;
+  accountSequence: string;
+  userId: string;
+  walletId: string;
+  amount: string;
+  fee: string;
+  netAmount: string;
+  assetType: string;
+  chainType: string;
+  toAddress: string;
+}
+
+export type WithdrawalEventHandler = (payload: WithdrawalRequestedPayload) => Promise<void>;
+
+@Injectable()
+export class WithdrawalEventConsumerService implements OnModuleInit, OnModuleDestroy {
+  private readonly logger = new Logger(WithdrawalEventConsumerService.name);
+  private kafka: Kafka;
+  private consumer: Consumer;
+  private isConnected = false;
+
+  private withdrawalRequestedHandler?: WithdrawalEventHandler;
+
+  constructor(private readonly configService: ConfigService) {}
+
+  async onModuleInit() {
+    const brokers = this.configService.get<string>('KAFKA_BROKERS')?.split(',') || ['localhost:9092'];
+    const clientId = this.configService.get<string>('KAFKA_CLIENT_ID') || 'blockchain-service';
+    const groupId = 'blockchain-service-withdrawal-events';
+
+    this.logger.log(`[INIT] Withdrawal Event Consumer initializing...`);
+    this.logger.log(`[INIT] ClientId: ${clientId}`);
+    this.logger.log(`[INIT] GroupId: ${groupId}`);
+    this.logger.log(`[INIT] Brokers: ${brokers.join(', ')}`);
+    this.logger.log(`[INIT] Topics: ${Object.values(WITHDRAWAL_TOPICS).join(', ')}`);
+
+    this.kafka = new Kafka({
+      clientId,
+      brokers,
+      logLevel: logLevel.WARN,
+      retry: {
+        initialRetryTime: 100,
+        retries: 8,
+      },
+    });
+
+    this.consumer = this.kafka.consumer({
+      groupId,
+      sessionTimeout: 30000,
+      heartbeatInterval: 3000,
+    });
+
+    try {
+      this.logger.log(`[CONNECT] Connecting Withdrawal Event consumer...`);
+      await this.consumer.connect();
+      this.isConnected = true;
+      this.logger.log(`[CONNECT] Withdrawal Event consumer connected successfully`);
+
+      await this.consumer.subscribe({
+        topics: Object.values(WITHDRAWAL_TOPICS),
+        fromBeginning: false,
+      });
+      this.logger.log(`[SUBSCRIBE] Subscribed to withdrawal topics`);
+
+      await this.startConsuming();
+    } catch (error) {
+      this.logger.error(`[ERROR] Failed to connect Withdrawal Event consumer`, error);
+    }
+  }
+
+  async onModuleDestroy() {
+    if (this.isConnected) {
+      await this.consumer.disconnect();
+      this.logger.log('Withdrawal Event consumer disconnected');
+    }
+  }
+
+  /**
+   * Register handler for withdrawal requested events
+   */
+  onWithdrawalRequested(handler: WithdrawalEventHandler): void {
+    this.withdrawalRequestedHandler = handler;
+    this.logger.log(`[REGISTER] WithdrawalRequested handler registered`);
+  }
+
+  private async startConsuming(): Promise<void> {
+    await this.consumer.run({
+      eachMessage: async ({ topic, partition, message }: EachMessagePayload) => {
+        const offset = message.offset;
+        this.logger.log(`[RECEIVE] Message received: topic=${topic}, partition=${partition}, offset=${offset}`);
+
+        try {
+          const value = message.value?.toString();
+          if (!value) {
+            this.logger.warn(`[RECEIVE] Empty message received on ${topic}`);
+            return;
+          }
+
+          this.logger.log(`[RECEIVE] Raw message: ${value.substring(0, 500)}...`);
+
+          const parsed = JSON.parse(value);
+          const eventType = parsed.eventType;
+          const payload = parsed.payload || parsed;
+
+          this.logger.log(`[RECEIVE] Event type: ${eventType}`);
+
+          if (eventType === 'wallet.withdrawal.requested') {
+            this.logger.log(`[HANDLE] Processing WithdrawalRequested event`);
+            this.logger.log(`[HANDLE] orderNo: ${payload.orderNo}`);
+            this.logger.log(`[HANDLE] chainType: ${payload.chainType}`);
+            this.logger.log(`[HANDLE] toAddress: ${payload.toAddress}`);
+            this.logger.log(`[HANDLE] amount: ${payload.amount}`);
+
+            if (this.withdrawalRequestedHandler) {
+              await this.withdrawalRequestedHandler(payload as WithdrawalRequestedPayload);
+              this.logger.log(`[HANDLE] WithdrawalRequested handler completed`);
+            } else {
+              this.logger.warn(`[HANDLE] No handler registered for WithdrawalRequested`);
+            }
+          } else {
+            this.logger.warn(`[RECEIVE] Unknown event type: ${eventType}`);
+          }
+        } catch (error) {
+          this.logger.error(`[ERROR] Error processing withdrawal event from ${topic}`, error);
+        }
+      },
+    });
+
+    this.logger.log(`[START] Started consuming withdrawal events`);
+  }
+}
diff --git a/backend/services/blockchain-service/src/infrastructure/persistence/mappers/deposit-transaction.mapper.ts b/backend/services/blockchain-service/src/infrastructure/persistence/mappers/deposit-transaction.mapper.ts
index d8a70ec5..dab37f55 100644
--- a/backend/services/blockchain-service/src/infrastructure/persistence/mappers/deposit-transaction.mapper.ts
+++ b/backend/services/blockchain-service/src/infrastructure/persistence/mappers/deposit-transaction.mapper.ts
@@ -7,7 +7,16 @@ import { ChainType, TxHash, EvmAddress, TokenAmount, BlockNumber } from '@/domai
 import { DepositStatus } from '@/domain/enums';
 
 export class DepositTransactionMapper {
+  /**
+   * Map from Prisma to Domain (only for USER deposits)
+   * System account deposits are handled separately
+   */
   static toDomain(prisma: PrismaDepositTransaction): DepositTransaction {
+    // For USER deposits, accountSequence and userId must exist
+    if (!prisma.accountSequence || !prisma.userId) {
+      throw new Error(`DepositTransaction ${prisma.id} missing accountSequence or userId`);
+    }
+
     const props: DepositTransactionProps = {
       id: prisma.id,
       chainType: ChainType.create(prisma.chainType),
@@ -52,8 +61,11 @@ export class DepositTransactionMapper {
       confirmations: domain.confirmations,
       status: domain.status,
       addressId: domain.addressId,
+      addressType: 'USER',
       accountSequence: domain.accountSequence,
       userId: domain.userId,
+      systemAccountType: null,
+      systemAccountId: null,
       notifiedAt: domain.notifiedAt ?? null,
       notifyAttempts: domain.notifyAttempts,
       lastNotifyError: domain.lastNotifyError ?? null,
diff --git a/backend/services/blockchain-service/src/infrastructure/persistence/mappers/monitored-address.mapper.ts b/backend/services/blockchain-service/src/infrastructure/persistence/mappers/monitored-address.mapper.ts
index 1d47b76d..4c765087 100644
--- a/backend/services/blockchain-service/src/infrastructure/persistence/mappers/monitored-address.mapper.ts
+++ b/backend/services/blockchain-service/src/infrastructure/persistence/mappers/monitored-address.mapper.ts
@@ -3,7 +3,16 @@ import { MonitoredAddress, MonitoredAddressProps } from '@/domain/aggregates/mon
 import { ChainType, EvmAddress } from '@/domain/value-objects';
 
 export class MonitoredAddressMapper {
+  /**
+   * Map from Prisma to Domain (only for USER addresses)
+   * System addresses are handled separately
+   */
   static toDomain(prisma: PrismaMonitoredAddress): MonitoredAddress {
+    // For USER addresses, accountSequence and userId must exist
+    if (!prisma.accountSequence || !prisma.userId) {
+      throw new Error(`MonitoredAddress ${prisma.id} missing accountSequence or userId`);
+    }
+
     const props: MonitoredAddressProps = {
       id: prisma.id,
       chainType: ChainType.create(prisma.chainType),
@@ -25,8 +34,12 @@ export class MonitoredAddressMapper {
       id: domain.id,
       chainType: domain.chainType.toString(),
       address: domain.address.lowercase,
+      addressType: 'USER',
       accountSequence: domain.accountSequence,
       userId: domain.userId,
+      systemAccountType: null,
+      systemAccountId: null,
+      regionCode: null,
       isActive: domain.isActive,
     };
   }