diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..623774f
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,30 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "chrome",
+      "request": "launch",
+      "name": "Launch Chrome against localhost",
+      "url": "http://localhost:3000",
+      "webRoot": "${workspaceRoot}/packages/ui/src"
+    },
+    {
+      "name": "keypering",
+      "type": "node",
+      "request": "launch",
+      "cwd": "${workspaceRoot}/packages/app",
+      "runtimeExecutable": "${workspaceRoot}/node_modules/.bin/electron",
+      "windows": {
+        "runtimeExecutable": "${workspaceRoot}/node_modules/.bin/electron.cmd"
+      },
+      "args": ["."],
+      "outputCapture": "std",
+      "env": {
+        "NODE_ENV": "development"
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3694cb9..ff26234 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,27 @@
 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
+# [0.1.0-alpha.3](https://github.com/nervosnetwork/keypering/compare/v0.1.0-alpha.2...v0.1.0-alpha.3) (2020-12-11)
+
+
+### Bug Fixes
+
+* Add devnet support ([4177caa](https://github.com/nervosnetwork/keypering/commit/4177caa7bdde7fc5cc46324b6c1346538ec70eb8))
+* Fix variable has already been declared ([99e8f53](https://github.com/nervosnetwork/keypering/commit/99e8f53c27ca3dfb185d20237983cf4ec248f671))
+* remove cell deps leave null dialog ([bc4fc03](https://github.com/nervosnetwork/keypering/commit/bc4fc033855f98448f89b7ec8d257143f14fb165))
+* update indexer_url const ([2124eee](https://github.com/nervosnetwork/keypering/commit/2124eee577c5a4562ceed05390bcd80edd91df7f))
+* Use blake2b encrypt message ([1be4e29](https://github.com/nervosnetwork/keypering/commit/1be4e29e872a89d6782c702fcbb93ada45909077))
+
+
+### Features
+
+* add sign message rpc interface ([599d378](https://github.com/nervosnetwork/keypering/commit/599d378eec67c97475b8b31eba571139b43dc8b8))
+* support vscode debug ([e631353](https://github.com/nervosnetwork/keypering/commit/e6313535df81340e0dc8fad1d224efa8b109248e))
+
+
+
+
+
 # [0.1.0-alpha.2](https://github.com/nervosnetwork/keypering/compare/v0.1.0-alpha.1...v0.1.0-alpha.2) (2020-09-28)
 
 
diff --git a/README.md b/README.md
index 2e7aa32..daec1b1 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,15 @@ Keypering consists of 3 components:
 - [How to Develop a CKB DApp with Keypering (Video, Chinese + English Subtitles)](https://youtu.be/i-gQ0enK5cY)
 - [How to Develop a CKB DApp with Keypering (Slides)](https://docs.google.com/presentation/d/1bswEhjSYwZZnUCF4rRL5x5vfOVXO_kDlbjsojsG94w8/edit?usp=sharing)
 
+# Develop in devnet
+
+1. Clone [perkins-tent](https://github.com/xxuejie/perkins-tent)
+2. Run `docker run -e CKB_NETWORK=dev --rm -p 8114:9115 -v ~/.ckb-docker-devnet:/data xxuejie/perkins-tent`
+3. Go to `~/.ckb-docker-devnet/confs/nginx.conf` change `location = /indexer_rpc` to `location = /indexer`
+4. Open keypering setting page then click Rich Node RPC setting icon, set `http://localhost:8114/indexer` in devent input
+5. Finish!
+6. If you want to run a miner, append ` miner: ckb miner -C /data/ckb-data` to `~/.ckb-docker-devnet/confs/Procfile`
+
 # Resources
 
 - [Keypering Manual](https://nervosnetwork.github.io/keypering/#/manual) - User Guide of Keypering
diff --git a/docs/_media/screenshots/24.sign_message_rpc.png b/docs/_media/screenshots/24.sign_message_rpc.png
new file mode 100644
index 0000000..fb87c90
Binary files /dev/null and b/docs/_media/screenshots/24.sign_message_rpc.png differ
diff --git a/docs/_media/screenshots/25.check_signed_message.png b/docs/_media/screenshots/25.check_signed_message.png
new file mode 100644
index 0000000..7af820e
Binary files /dev/null and b/docs/_media/screenshots/25.check_signed_message.png differ
diff --git a/docs/manual.md b/docs/manual.md
index 1c86939..0de2d09 100644
--- a/docs/manual.md
+++ b/docs/manual.md
@@ -196,6 +196,20 @@ DApp can send JSON RPC conforming to [Keypering Agency Protocal](/protocol) to i
 
 ---
 
+### Sign Message from DApp
+
+<div class="center">
+  <b><small>Sign Message</small></b>
+  <img src="_media/screenshots/24.sign_message_rpc.png" alt="Sign Message from DApp">
+</div>
+
+<div class="center">
+  <b><small>Check Signed Message from DApp</small></b>
+  <img src="_media/screenshots/25.check_signed_message.png" alt="Check Signed Message from DApp">
+</div>
+
+---
+
 ## Setting
 
 ![Sidebar](_media/screenshots/22.sidebar.png)
diff --git a/lerna.json b/lerna.json
index 031b095..56ba218 100644
--- a/lerna.json
+++ b/lerna.json
@@ -4,5 +4,5 @@
   ],
   "npmClient": "yarn",
   "useWorkspaces": true,
-  "version": "0.1.0-alpha.2"
+  "version": "0.1.0-alpha.3"
 }
diff --git a/packages/app/CHANGELOG.md b/packages/app/CHANGELOG.md
index 84d2f5d..2a0a231 100644
--- a/packages/app/CHANGELOG.md
+++ b/packages/app/CHANGELOG.md
@@ -3,6 +3,26 @@
 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
+# [0.1.0-alpha.3](https://github.com/nervosnetwork/keypering/compare/v0.1.0-alpha.2...v0.1.0-alpha.3) (2020-12-11)
+
+
+### Bug Fixes
+
+* Add devnet support ([4177caa](https://github.com/nervosnetwork/keypering/commit/4177caa7bdde7fc5cc46324b6c1346538ec70eb8))
+* Fix variable has already been declared ([99e8f53](https://github.com/nervosnetwork/keypering/commit/99e8f53c27ca3dfb185d20237983cf4ec248f671))
+* remove cell deps leave null dialog ([bc4fc03](https://github.com/nervosnetwork/keypering/commit/bc4fc033855f98448f89b7ec8d257143f14fb165))
+* update indexer_url const ([2124eee](https://github.com/nervosnetwork/keypering/commit/2124eee577c5a4562ceed05390bcd80edd91df7f))
+* Use blake2b encrypt message ([1be4e29](https://github.com/nervosnetwork/keypering/commit/1be4e29e872a89d6782c702fcbb93ada45909077))
+
+
+### Features
+
+* add sign message rpc interface ([599d378](https://github.com/nervosnetwork/keypering/commit/599d378eec67c97475b8b31eba571139b43dc8b8))
+
+
+
+
+
 # [0.1.0-alpha.2](https://github.com/nervosnetwork/keypering/compare/v0.1.0-alpha.1...v0.1.0-alpha.2) (2020-09-28)
 
 
diff --git a/packages/app/__tests__/keyper/sign.ts b/packages/app/__tests__/keyper/sign.ts
new file mode 100644
index 0000000..3c4fc72
--- /dev/null
+++ b/packages/app/__tests__/keyper/sign.ts
@@ -0,0 +1,14 @@
+import { signMsg } from '../../src/keyper/sign'
+
+describe("Test signMsg", () => {
+  const info = {
+    sk: '0xe79f3207ea4980b7fed79956d5934249ceac4751a4fae01a0f7c4a96884bc4e3',
+    message: 'HelloWorld',
+    signture: '0x97ed8c48879eed50743532bf7cc53e641c501509d2be19d06e6496dd944a21b4509136f18c8e139cc4002822b2deb5cbaff8e44b8782769af3113ff7fb8bd92700'
+  }
+
+  it('signMsg', () => {
+    expect(signMsg(info.sk, info.message))
+      .toEqual(info.signture)
+  })
+})
\ No newline at end of file
diff --git a/packages/app/__tests__/utils/transformer/index.ts b/packages/app/__tests__/utils/transformer/index.ts
index 5d9acbe..1c8d512 100644
--- a/packages/app/__tests__/utils/transformer/index.ts
+++ b/packages/app/__tests__/utils/transformer/index.ts
@@ -1,4 +1,4 @@
-import { shannonToCkb } from '../../../src/utils/transformer'
+import { shannonToCkb, messageToHex } from '../../../src/utils/transformer'
 import fixtures from './fixtures.json'
 
 describe('Test transformer', () => {
@@ -15,5 +15,14 @@ describe('Test transformer', () => {
       expect(shannonToCkb('1234567890123456789', false, '')).toBe('12345678901.23456789')
     })
   })
-})
 
+  describe('Test messageToHex', () => {
+    it('returns correct length hex', () => {
+      expect(messageToHex('helloCKB')).toBe('0x68656c6c6f434b42000000000000000000000000000000000000000000000000')
+    })
+
+    it('throws error', () => {
+      expect( () => { messageToHex("I am a string and I will longer than 32bytes") }).toThrow('Message length greater than 32 bytes')
+    })
+  })
+})
diff --git a/packages/app/package.json b/packages/app/package.json
index eec57dd..1b9773e 100644
--- a/packages/app/package.json
+++ b/packages/app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@keypering/app",
-  "version": "0.1.0-alpha.2",
+  "version": "0.1.0-alpha.3",
   "description": "",
   "author": "Keith <keithwhisper@gmail.com>",
   "homepage": "https://nervosnetwork.github.io/keypering",
@@ -32,7 +32,7 @@
     "url": "https://github.com/nervosnetwork/keypering/issues"
   },
   "devDependencies": {
-    "@keypering/specs": "0.1.0-alpha.2",
+    "@keypering/specs": "0.1.0-alpha.3",
     "@types/elliptic": "6.4.12",
     "@types/uuid": "8.0.1",
     "electron": "9.2.0",
diff --git a/packages/app/public/dialogs/signMessage.html b/packages/app/public/dialogs/signMessage.html
new file mode 100644
index 0000000..0616556
--- /dev/null
+++ b/packages/app/public/dialogs/signMessage.html
@@ -0,0 +1,139 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta http-equiv="X-UA-Compatible" content="ie=edge">
+  <title>Signing</title>
+  <style>
+    * {
+      box-sizing: border-box;
+    }
+
+    body {
+      --primary-green: #3cc68a;
+      margin: 0;
+      padding: 20px;
+      font-size: 14px;
+      letter-spacing: 0.23px;
+      user-select: none;
+      line-height: 1.2;
+      font-weight: 400;
+      background: #fff;
+    }
+
+    #message, #address {
+      color: var(--primary-green);
+    }
+
+    h1 {
+      font-size: 16px;
+      letter-spacing: 0.2px;
+      color: #000;
+      margin-bottom: 20px;
+    }
+
+    form div {
+      margin-bottom: 14px;
+      overflow: hidden;
+      white-space: nowrap;
+      text-overflow: ellipsis;
+    }
+
+    .footer {
+      display: flex;
+      justify-content: flex-end;
+      margin-top: 20px;
+    }
+
+    button {
+      width: 80px;
+      height: 30px;
+      border-radius: 2px;
+      outline: none;
+      border: none;
+      text-transform: capitalize;
+      margin-left: 10px;
+    }
+
+    button:hover {
+      filter: brightness(0.9);
+    }
+
+    button[type=submit] {
+      background-color: var(--primary-green);
+      color: #fff;
+    }
+
+    button:disabled {
+      filter: grayscale(0) !important;
+    }
+  </style>
+</head>
+
+<body>
+  <form>
+    <h1>Message Confirmation</h1>
+    <div>Message: <span id="message">...</span></div>
+    <div>Address: <span id="address">...</span></div>
+    <div class="footer">
+      <button type="button">decline</button>
+      <button type="submit">approve</button>
+    </div>
+  </form>
+  <script>
+    const search = new URLSearchParams(location.search)
+    const address = search.get('address')
+    if (!address) {
+      window.alert('Invalid request')
+      window.close()
+    }
+
+    const channel = `signMsg:${address}`
+
+    const messageElement = document.querySelector("#message")
+    const addressElement = document.querySelector('#address')
+    const form = document.querySelector('form')
+    const submitBtn = document.querySelector('button[type=submit]')
+    const declineBtn = document.querySelector('button[type=button]')
+
+    const handleCancel = () => {
+      ipcRenderer?.send(channel, false)
+      window.close()
+    }
+
+    const handleSubmit = () => {
+      ipcRenderer?.send(channel, true)
+      submitBtn?.setAttribute('disabled', true)
+      declineBtn?.setAttribute('disabled', true)
+    }
+
+    declineBtn?.addEventListener('click', handleCancel)
+    submitBtn?.focus()
+
+    form.addEventListener('submit', (e) => {
+      e.preventDefault()
+      handleSubmit()
+    })
+
+    window.addEventListener('keyup', (e) => {
+      if (e.key === 'Escape') {
+        handleCancel()
+      }
+    })
+
+    ipcRenderer?.once(channel, (_e, params) => {
+      try {
+        const { message, address } = params
+        messageElement.innerText = message
+        addressElement.innerText = address
+      } catch (err) {
+        window.alert(err.message)
+        window.close()
+      }
+    })
+  </script>
+</body>
+
+</html>
diff --git a/packages/app/src/keyper/sign.ts b/packages/app/src/keyper/sign.ts
index ab5f542..804bbb7 100644
--- a/packages/app/src/keyper/sign.ts
+++ b/packages/app/src/keyper/sign.ts
@@ -3,8 +3,9 @@ import { Container } from '@nervosnetwork/keyper-container'
 import { SignatureAlgorithm } from '@nervosnetwork/keyper-specs'
 import ECPair from '@nervosnetwork/ckb-sdk-utils/lib/ecpair'
 import { getSetting } from '../setting'
+import Blake2b from "../models/blake2b"
 
-const sign = (sk: string, params: Omit<KeyperingAgency.SignTransaction.Params['params'], 'description'>) => {
+export const signTx = (sk: string, params: Omit<KeyperingAgency.SignTransaction.Params['params'], 'description'>) => {
 
   const container = new Container([
     {
@@ -35,4 +36,17 @@ const sign = (sk: string, params: Omit<KeyperingAgency.SignTransaction.Params['p
   return container.sign({ lockHash: params.lockHash }, params.tx, params.inputSignConfig)
 }
 
-export default sign
+export const signMsg = (sk: string, message: string) => {
+  const digest = signtureHash(message)
+  const ecPair = new ECPair(sk)
+  const signature = ecPair.signRecoverable(digest)
+  return signature
+}
+
+const signtureHash = (message: string) => {
+  const magicString = 'Nervos Message:'
+  const buffer = Buffer.from(magicString + message, 'utf-8')
+  const blake2b = new Blake2b()
+  blake2b.updateBuffer(buffer)
+  return blake2b.digest()
+}
diff --git a/packages/app/src/models/blake2b.ts b/packages/app/src/models/blake2b.ts
new file mode 100644
index 0000000..65054a6
--- /dev/null
+++ b/packages/app/src/models/blake2b.ts
@@ -0,0 +1,30 @@
+import { blake2b, PERSONAL, hexToBytes } from '@nervosnetwork/ckb-sdk-utils'
+
+export default class Blake2b {
+  private blake2b: any
+
+  constructor() {
+    this.blake2b = blake2b(32, null, null, PERSONAL)
+  }
+
+  public update = (message: string): void => {
+    const msg = message.startsWith('0x') ?
+      message :
+      `0x${message}`
+    this.blake2b.update(hexToBytes(msg))
+  }
+
+  public updateBuffer = (message: Buffer): void => {
+    this.blake2b.update(message)
+  }
+
+  public digest = (): string => {
+    return `0x${this.blake2b.digest('hex')}`
+  }
+
+  public static digest = (message: string): string => {
+    const blake2bHash = new Blake2b()
+    blake2bHash.update(message)
+    return blake2bHash.digest()
+  }
+}
\ No newline at end of file
diff --git a/packages/app/src/server/controller.ts b/packages/app/src/server/controller.ts
index cc190da..b5e8d9b 100644
--- a/packages/app/src/server/controller.ts
+++ b/packages/app/src/server/controller.ts
@@ -3,7 +3,7 @@ import CKB from '@nervosnetwork/ckb-sdk-core'
 import { requestAuth } from '../auth'
 import { getWalletIndex } from '../wallet'
 import { getAddresses } from '../address'
-import { requestSignTx, requestSendTx } from '../tx'
+import { requestSignTx, requestSendTx, requestSignMsg } from '../tx'
 import { getSetting } from '../setting'
 import { networksToRpcUrl } from '../utils/transformer'
 
@@ -59,3 +59,10 @@ export const handleQueryAddresses = async () => {
     addresses
   }
 }
+
+export const handleSignMessage = async (params: KeyperingAgency.SignMessage.Params['params']) => {
+  const sig = await requestSignMsg(params.message, params.address)
+  return {
+    sig
+  }
+}
diff --git a/packages/app/src/server/routes.ts b/packages/app/src/server/routes.ts
index 9445da3..2c2015a 100644
--- a/packages/app/src/server/routes.ts
+++ b/packages/app/src/server/routes.ts
@@ -1,6 +1,6 @@
 import type { IncomingHttpHeaders } from 'http'
 import { KeyperingAgency } from '@keypering/specs'
-import { handleAuth, handleSign, handleSend, handleSignAndSend, handleQueryAddresses } from './controller'
+import { handleAuth, handleSign, handleSend, handleSignAndSend, handleQueryAddresses, handleSignMessage } from './controller'
 import { MethodNotFoundException } from '../exception'
 import useGuard from './useGuard'
 
@@ -27,6 +27,9 @@ const routes = async (method: KeyperingAgency.Method, params: any, headers: Inco
     case 'sign_and_send_transaction': {
       return handleSignAndSend(params, referer || origin)
     }
+    case 'sign_message': {
+      return handleSignMessage(params)
+    }
     default: {
       throw new MethodNotFoundException(method || 'undefined')
     }
diff --git a/packages/app/src/setting/networks.ts b/packages/app/src/setting/networks.ts
index c789ad5..6783f9d 100644
--- a/packages/app/src/setting/networks.ts
+++ b/packages/app/src/setting/networks.ts
@@ -1,5 +1,5 @@
 import type { Channel } from '@keypering/specs'
-import { MAINNET_ID, TESTNET_ID, DEVNET_ID, RICH_NODE_MAINNET_INDEXER_URL, RICH_NODE_TESTNET_INDEXER_URL } from '../utils'
+import { MAINNET_ID, TESTNET_ID, DEVNET_ID, RICH_NODE_MAINNET_INDEXER_URL, RICH_NODE_TESTNET_INDEXER_URL, RICH_NODE_DEVNET_INDEXER_URL } from '../utils'
 const networks = new Map<Channel.NetworkId, { name: string, url: string }>([
   [
     MAINNET_ID,
@@ -19,7 +19,7 @@ const networks = new Map<Channel.NetworkId, { name: string, url: string }>([
     DEVNET_ID,
     {
       name: 'devnet',
-      url: RICH_NODE_TESTNET_INDEXER_URL,
+      url: RICH_NODE_DEVNET_INDEXER_URL,
     }
   ]
 ])
diff --git a/packages/app/src/setting/scripts.ts b/packages/app/src/setting/scripts.ts
index 2dc6cce..1418e36 100644
--- a/packages/app/src/setting/scripts.ts
+++ b/packages/app/src/setting/scripts.ts
@@ -3,6 +3,7 @@ import { Secp256k1LockScript } from '@nervosnetwork/keyper-container/lib/locks/s
 import { AnyPayLockScript } from '@nervosnetwork/keyper-container/lib/locks/anyone-can-pay'
 import {
   SECP256K1_BLAKE160_CODE_HASH,
+  SECP256K1_BLAKE160_DEVNET_TX_HASH,
   SECP256K1_BLAKE160_MAINNET_TX_HASH,
   SECP256K1_BLAKE160_TESTNET_TX_HASH,
   ANYONE_CAN_PAY_CODE_HASH,
@@ -42,4 +43,16 @@ const testnetScripts: LockScript[] = [
     },
   ]),
 ]
-export default { mainnetScripts, testnetScripts }
+
+const devnetScripts: LockScript[] = [
+  new Secp256k1LockScript(SECP256K1_BLAKE160_CODE_HASH, 'type', [
+    {
+      outPoint: {
+        txHash: SECP256K1_BLAKE160_DEVNET_TX_HASH,
+        index: '0x0',
+      },
+      depType: 'depGroup',
+    },
+  ])
+]
+export default { mainnetScripts, testnetScripts, devnetScripts }
diff --git a/packages/app/src/setting/service.ts b/packages/app/src/setting/service.ts
index 3d75274..25688fc 100644
--- a/packages/app/src/setting/service.ts
+++ b/packages/app/src/setting/service.ts
@@ -82,11 +82,21 @@ export const getSetting = () => {
     }
   })
 
-  const scriptsToShow = setting.networkId === MAINNET_ID
-    ? systemScripts.mainnetScripts
-    : setting.networkId === TESTNET_ID
-      ? systemScripts.testnetScripts
-      : []
+  let scriptsToShow: LockScript[];
+
+  switch(setting.networkId) {
+    case MAINNET_ID:
+      scriptsToShow = systemScripts.mainnetScripts
+      break;
+    case TESTNET_ID:
+      scriptsToShow = systemScripts.testnetScripts
+      break;
+    case DEVNET_ID:
+      scriptsToShow = systemScripts.devnetScripts
+      break;
+    default:
+      scriptsToShow = []
+  }
 
   scriptsToShow.forEach(script => {
     locks[getScriptId(script)] = {
diff --git a/packages/app/src/tx/SignMessageWindow.ts b/packages/app/src/tx/SignMessageWindow.ts
new file mode 100644
index 0000000..3d33b88
--- /dev/null
+++ b/packages/app/src/tx/SignMessageWindow.ts
@@ -0,0 +1,68 @@
+import path from 'path'
+import { BrowserWindow } from 'electron'
+import MainWindow from '../MainWindow'
+
+export default class SignMessageWindow {
+  #win = new BrowserWindow({
+    width: 430,
+    height: 260,
+    minWidth: 430,
+    maxWidth: 430,
+    maximizable: false,
+    fullscreenable: false,
+    autoHideMenuBar: true,
+    titleBarStyle: 'hidden',
+    title: 'Signing',
+    show: false,
+    frame: false,
+    parent: MainWindow.id
+      ? BrowserWindow.fromId(MainWindow.id)
+      : undefined,
+    modal: true,
+    backgroundColor: '#fff',
+    webPreferences: {
+      nodeIntegration: false,
+      preload: path.resolve(__dirname, '..', 'preload.js'),
+    },
+  })
+
+  get win() {
+    return this.#win
+  }
+
+  #filePath = ''
+  #channel = ''
+  get channel() {
+    return this.#channel
+  }
+
+  constructor(message: string, address: string) {
+    this.#filePath = path.join('file://', __dirname, '..', '..', 'public', 'dialogs', `signMessage.html?message=${message}&address=${address}`)
+    this.#channel = `signMsg:${address}`
+    this.#win.on('ready-to-show', () => {
+      this.#win.show()
+      this.#win.webContents.send(this.#channel, { message, address })
+    })
+  }
+
+  public load = () => {
+    this.#win.loadURL(this.#filePath)
+  }
+
+  public close = () => {
+    this.#win.close()
+  }
+
+  public response = (): Promise<boolean> => {
+    return new Promise((resolve, reject) => {
+      this.#win.webContents.once('ipc-message', (_e, channel, args: boolean) => {
+        if (channel === this.#channel && typeof args === 'boolean') {
+          resolve(args)
+        } else {
+          reject(args)
+        }
+      })
+      this.load()
+    })
+  }
+}
diff --git a/packages/app/src/tx/service.ts b/packages/app/src/tx/service.ts
index b12f177..c3125d6 100644
--- a/packages/app/src/tx/service.ts
+++ b/packages/app/src/tx/service.ts
@@ -1,11 +1,11 @@
 import fs from 'fs'
 import path from 'path'
-import { dialog } from 'electron'
 import { Channel, KeyperingAgency } from '@keypering/specs'
 import CKB from '@nervosnetwork/ckb-sdk-core'
 import RequestWindow from './RequestWindow'
+import SignMessageWindow from './SignMessageWindow'
 import PasswordWindow from '../wallet/PasswordWindow'
-import { getWalletIndex, signTransaction, getKeystoreByWalletId } from '../wallet'
+import { getWalletIndex, signTransaction, getKeystoreByWalletId, signMessage } from '../wallet'
 import { getSetting } from '../setting'
 import { getTxProfile } from './utils'
 import { getDataPath, networksToRpcUrl } from '../utils'
@@ -98,13 +98,6 @@ export const requestSignTx = async (params: {
     throw new Error('Transaction is not found in parameter')
   }
 
-  if (params.tx?.cellDeps?.length) {
-    dialog.showMessageBox({
-      type: 'warning',
-      title: 'Warning',
-      message: 'Please leave cell deps empty since Keypering provides them'
-    })
-  }
   const dataToConfirm = await getTxProfile(params.tx, params.referer, params.description)
   const { current } = getWalletIndex()
   if (!current) {
@@ -219,3 +212,42 @@ export const requestSendTx = async (params: {
   }
 }
 
+export const requestSignMsg = async (
+  message: string,
+  address: string
+) => {
+  const { current } = getWalletIndex()
+  if (!current) {
+    throw new CurrentWalletNotSetException()
+  }
+
+  try {
+    const signMessageWindow = new SignMessageWindow(message, address)
+    const approve = await signMessageWindow.response()
+    if (!approve) {
+      throw new RequestRejected()
+    }
+
+    const pwdWindow = new PasswordWindow("NoRequestId", 'Sign Message')
+    pwdWindow.win.setParentWindow(signMessageWindow.win)
+    const passwordRes = await pwdWindow.response()
+    signMessageWindow.close()
+
+    if (typeof passwordRes === 'string') {
+      const keystore = getKeystoreByWalletId(current)
+      const signedMsg = await signMessage({
+        keystore,
+        password: passwordRes,
+        message
+      })
+      return signedMsg
+    }
+    if (passwordRes === false) {
+      throw new RequestRejected()
+    }
+    return false
+  } catch (err) {
+    console.error(err)
+    throw err
+  }
+}
\ No newline at end of file
diff --git a/packages/app/src/utils/const.ts b/packages/app/src/utils/const.ts
index 9874103..99f3e6e 100644
--- a/packages/app/src/utils/const.ts
+++ b/packages/app/src/utils/const.ts
@@ -9,6 +9,8 @@ export const ANYONE_CAN_PAY_TESTNET_TX_HASH = '0x4f32b3e39bd1b6350d326fdfafdfe05
 export const SECP256K1_BLAKE160_CODE_HASH = '0x9bd7e06f3ecf4be0f2fcd2188b23f1b9fcc88e5d4b65a8637b17723bbda3cce8'
 export const SECP256K1_BLAKE160_TESTNET_TX_HASH = '0xf8de3bb47d055cdf460d93a2a6e1b05f7432f9777c8c474abf4eec1d4aee5d37'
 export const SECP256K1_BLAKE160_MAINNET_TX_HASH = '0x71a7ba8fc96349fea0ed3a5c47992e3b4084b031a42264a018e0072e8172e46c'
+export const SECP256K1_BLAKE160_DEVNET_TX_HASH = '0xace5ea83c478bb866edf122ff862085789158f5cbff155b7bb5f13058555b708'
 
-export const RICH_NODE_MAINNET_INDEXER_URL = 'https://prototype.ckbapp.dev/mainnet/indexer'
-export const RICH_NODE_TESTNET_INDEXER_URL = 'https://prototype.ckbapp.dev/testnet/indexer'
+export const RICH_NODE_MAINNET_INDEXER_URL = 'https://mainnet.ckbapp.dev/indexer'
+export const RICH_NODE_TESTNET_INDEXER_URL = 'https://testnet.ckbapp.dev/indexer'
+export const RICH_NODE_DEVNET_INDEXER_URL = 'http://localhost:8114/indexer'
diff --git a/packages/app/src/utils/transformer.ts b/packages/app/src/utils/transformer.ts
index 395debb..84f0811 100644
--- a/packages/app/src/utils/transformer.ts
+++ b/packages/app/src/utils/transformer.ts
@@ -44,4 +44,15 @@ export const networksToRpcUrl = (params: { networkId: string, networks: Record<s
   throw new Error('Url is empty')
 }
 
-export default { shannonToCkb, networksToRpcUrl }
+export const messageToHex = (message: string) => {
+  let hexMessage = Buffer.from(message).toString('hex')
+  // needs 32 bytes length, same as ckb-cli
+  if (hexMessage.length <= 64){
+    hexMessage = hexMessage.padEnd(64, "0")
+  }else {
+    throw new Error("Message length greater than 32 bytes")
+  }
+  return `0x${hexMessage}`
+}
+
+export default { shannonToCkb, networksToRpcUrl, messageToHex }
diff --git a/packages/app/src/wallet/service.ts b/packages/app/src/wallet/service.ts
index b89b263..cfa5153 100644
--- a/packages/app/src/wallet/service.ts
+++ b/packages/app/src/wallet/service.ts
@@ -8,7 +8,7 @@ import { getAuthList, deleteAuthList } from '../auth'
 import { getTxList, deleteTxFilesByWalletId } from '../tx'
 import { getSetting } from '../setting'
 import PasswordWindow from './PasswordWindow'
-import signTx from '../keyper/sign'
+import { signTx, signMsg } from '../keyper/sign'
 import { getDataPath } from '../utils'
 import { broadcastWalletIndex as broadcast, broadcastAuthList, broadcastTxList } from '../broadcast'
 import {
@@ -199,12 +199,27 @@ interface SignTransactionParams {
   signConfig?: KeyperingAgency.SignTransaction.InputSignConfig
 }
 export const signTransaction = async ({ keystore, tx, password, signConfig, lockHash }: SignTransactionParams) => {
+  const sk = getChildSk(keystore, password)
+  const signed = await signTx(sk, { tx, lockHash, inputSignConfig: signConfig })
+  return signed
+}
+
+interface SignMessageParams {
+  keystore: Keystore
+  password: string
+  message: string
+}
+export const signMessage = async({keystore, password, message}: SignMessageParams) => {
+  const sk = getChildSk(keystore, password)
+  const signedMessage = await signMsg(sk, message)
+  return signedMessage
+}
+
+const getChildSk = function(keystore: Keystore, password: string) {
   const xprv = decryptKeystore(keystore, password)
   const masterSk = xprv.slice(0, 64)
   const masterChainCode = xprv.slice(64)
   const masterKeychain = new Keychain(Buffer.from(masterSk, 'hex'), Buffer.from(masterChainCode, 'hex'))
   const childKeychain = masterKeychain.getFirstChildKeychain()
-  const sk = `0x${childKeychain.privateKey.toString('hex')}`
-  const signed = await signTx(sk, { tx, lockHash, inputSignConfig: signConfig })
-  return signed
+  return `0x${childKeychain.privateKey.toString('hex')}`
 }
diff --git a/packages/specs/CHANGELOG.md b/packages/specs/CHANGELOG.md
index 51af2fc..c9f7738 100644
--- a/packages/specs/CHANGELOG.md
+++ b/packages/specs/CHANGELOG.md
@@ -3,6 +3,17 @@
 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
+# [0.1.0-alpha.3](https://github.com/nervosnetwork/keypering/compare/v0.1.0-alpha.2...v0.1.0-alpha.3) (2020-12-11)
+
+
+### Features
+
+* add sign message rpc interface ([599d378](https://github.com/nervosnetwork/keypering/commit/599d378eec67c97475b8b31eba571139b43dc8b8))
+
+
+
+
+
 # [0.1.0-alpha.2](https://github.com/nervosnetwork/keypering/compare/v0.1.0-alpha.1...v0.1.0-alpha.2) (2020-09-28)
 
 **Note:** Version bump only for package @keypering/specs
diff --git a/packages/specs/package.json b/packages/specs/package.json
index 626cb77..56a1e2c 100644
--- a/packages/specs/package.json
+++ b/packages/specs/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@keypering/specs",
-  "version": "0.1.0-alpha.2",
+  "version": "0.1.0-alpha.3",
   "description": "",
   "author": "Keith <keithwhisper@gmail.com>",
   "homepage": "https://nervosnetwork.github.io/keypering/#/protocol",
diff --git a/packages/specs/src/KeyperingAgency.ts b/packages/specs/src/KeyperingAgency.ts
index 5980dd0..bea2383 100644
--- a/packages/specs/src/KeyperingAgency.ts
+++ b/packages/specs/src/KeyperingAgency.ts
@@ -10,6 +10,7 @@ export enum Method {
   SignTransaction = 'sign_transaction',
   SendTransaction = 'send_transaction',
   SignAndSendTransactoin = 'sign_and_send_transaction',
+  SignMessage = 'sign_message',
 }
 
 export interface ParamsBase<M = Method, P = unknown> {
@@ -114,3 +115,15 @@ export namespace SignAndSendTransaction {
     txHash: string
   }>
 }
+
+export namespace SignMessage {
+  export type Params = ParamsBase<
+    Method.SignMessage,
+    {
+      message: string,
+      address: string
+    }
+  >
+
+  export type Response = ResponseBase<{ sig: string }>
+}
diff --git a/packages/ui/CHANGELOG.md b/packages/ui/CHANGELOG.md
index a6e5f7b..d50d37c 100644
--- a/packages/ui/CHANGELOG.md
+++ b/packages/ui/CHANGELOG.md
@@ -3,6 +3,14 @@
 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
+# [0.1.0-alpha.3](https://github.com/nervosnetwork/keypering/compare/v0.1.0-alpha.2...v0.1.0-alpha.3) (2020-12-11)
+
+**Note:** Version bump only for package @keypering/ui
+
+
+
+
+
 # [0.1.0-alpha.2](https://github.com/nervosnetwork/keypering/compare/v0.1.0-alpha.1...v0.1.0-alpha.2) (2020-09-28)
 
 **Note:** Version bump only for package @keypering/ui
diff --git a/packages/ui/package.json b/packages/ui/package.json
index e8f33dd..4a41187 100644
--- a/packages/ui/package.json
+++ b/packages/ui/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@keypering/ui",
-  "version": "0.1.0-alpha.2",
+  "version": "0.1.0-alpha.3",
   "private": true,
   "homepage": ".",
   "scripts": {
@@ -29,7 +29,7 @@
     "react-scripts": "3.4.1"
   },
   "devDependencies": {
-    "@keypering/specs": "0.1.0-alpha.2",
+    "@keypering/specs": "0.1.0-alpha.3",
     "@nervosnetwork/ckb-types": "0.34.0",
     "@types/react": "16.9.45",
     "@types/react-dom": "16.9.0",