diff --git a/apps/wallet-mobile/ios/Podfile.lock b/apps/wallet-mobile/ios/Podfile.lock
index 8efec1c935..4a95e284f1 100644
--- a/apps/wallet-mobile/ios/Podfile.lock
+++ b/apps/wallet-mobile/ios/Podfile.lock
@@ -354,6 +354,8 @@ PODS:
     - React-Core
   - react-native-haskell-shelley (6.0.0-alpha.9):
     - React
+  - react-native-message_signing-library (1.0.2):
+    - React
   - react-native-mmkv (2.11.0):
     - MMKV (>= 1.2.13)
     - React-Core
@@ -588,6 +590,7 @@ DEPENDENCIES:
   - react-native-ble-plx (from `../../../node_modules/react-native-ble-plx`)
   - react-native-config (from `../../../node_modules/react-native-config`)
   - "react-native-haskell-shelley (from `../../../node_modules/@emurgo/csl-mobile-bridge`)"
+  - "react-native-message_signing-library (from `../../../node_modules/@emurgo/msl-mobile-bridge`)"
   - react-native-mmkv (from `../../../node_modules/react-native-mmkv`)
   - react-native-pager-view (from `../../../node_modules/react-native-pager-view`)
   - react-native-quick-base64 (from `../../../node_modules/react-native-quick-base64`)
@@ -738,6 +741,8 @@ EXTERNAL SOURCES:
     :path: "../../../node_modules/react-native-config"
   react-native-haskell-shelley:
     :path: "../../../node_modules/@emurgo/csl-mobile-bridge"
+  react-native-message_signing-library:
+    :path: "../../../node_modules/@emurgo/msl-mobile-bridge"
   react-native-mmkv:
     :path: "../../../node_modules/react-native-mmkv"
   react-native-pager-view:
@@ -872,6 +877,7 @@ SPEC CHECKSUMS:
   react-native-ble-plx: f10240444452dfb2d2a13a0e4f58d7783e92d76e
   react-native-config: 86038147314e2e6d10ea9972022aa171e6b1d4d8
   react-native-haskell-shelley: 4015aef14eca3ecf5e8d8718e8d1b47cdcf60f84
+  react-native-message_signing-library: e81294a3cd40d74d3d83f0a1de72aa319238f09a
   react-native-mmkv: e97c0c79403fb94577e5d902ab1ebd42b0715b43
   react-native-pager-view: 0ccb8bf60e2ebd38b1f3669fa3650ecce81db2df
   react-native-quick-base64: 62290829c619fbabca4c41cfec75ae759d08fc1c
diff --git a/apps/wallet-mobile/jestSetup.ts b/apps/wallet-mobile/jestSetup.ts
index fc6ef21b1d..2b8ed0ccc9 100644
--- a/apps/wallet-mobile/jestSetup.ts
+++ b/apps/wallet-mobile/jestSetup.ts
@@ -16,6 +16,9 @@ jest.mock('react-native-ble-plx', () => ({}))
 jest.mock('@react-native-async-storage/async-storage', () =>
   require('@react-native-async-storage/async-storage/jest/async-storage-mock'),
 )
+
+jest.mock('@emurgo/cross-msl-mobile', () => require('@emurgo/cross-msl-nodejs'))
+
 jest.mock('react-native-keychain', () => ({
   resetGenericPassword: jest.fn(),
 }))
@@ -57,4 +60,3 @@ jest.mock('react-native-localize', () => ({
   usesAutoDateAndTime: () => true,
   usesAutoTimeZone: () => true,
 }))
-
diff --git a/apps/wallet-mobile/package.json b/apps/wallet-mobile/package.json
index 81a20b5fbe..524881bf21 100644
--- a/apps/wallet-mobile/package.json
+++ b/apps/wallet-mobile/package.json
@@ -96,7 +96,9 @@
     "@emurgo/cip4-js": "1.0.7",
     "@emurgo/cross-csl-core": "4.4.0",
     "@emurgo/cross-csl-mobile": "4.4.0",
+    "@emurgo/cross-msl-mobile": "^1.0.0",
     "@emurgo/csl-mobile-bridge": "6.0.0-alpha.9",
+    "@emurgo/msl-mobile-bridge": "^1.0.2",
     "@emurgo/react-native-blockies-svg": "^0.0.2",
     "@emurgo/react-native-hid": "^5.15.6",
     "@emurgo/yoroi-lib": "0.15.4-alpha.7",
@@ -217,6 +219,7 @@
     "@babel/runtime": "^7.20.0",
     "@emurgo/cardano-serialization-lib-nodejs": "12.0.0-alpha.28",
     "@emurgo/cross-csl-nodejs": "4.4.0",
+    "@emurgo/cross-msl-nodejs": "^1.0.0",
     "@formatjs/cli": "^6.1.0",
     "@formatjs/ts-transformer": "^3.13.0",
     "@react-navigation/devtools": "^6.0.13",
diff --git a/apps/wallet-mobile/src/features/Discover/common/helpers.ts b/apps/wallet-mobile/src/features/Discover/common/helpers.ts
index 51b1f6f699..cd2e347d50 100644
--- a/apps/wallet-mobile/src/features/Discover/common/helpers.ts
+++ b/apps/wallet-mobile/src/features/Discover/common/helpers.ts
@@ -2,7 +2,7 @@ import {connectionStorageMaker, dappConnectorApiMaker, dappConnectorMaker, Resol
 import {DappConnector} from '@yoroi/dapp-connector'
 import {App} from '@yoroi/types'
 
-import {cip30ExtensionMaker} from '../../../yoroi-wallets/cardano/cip30'
+import {cip30ExtensionMaker} from '../../../yoroi-wallets/cardano/cip30/cip30'
 import {YoroiWallet} from '../../../yoroi-wallets/cardano/types'
 
 export const validUrl = (url: string) => {
diff --git a/apps/wallet-mobile/src/yoroi-wallets/cardano/cip30.test.ts b/apps/wallet-mobile/src/yoroi-wallets/cardano/cip30/cip30.test.ts
similarity index 77%
rename from apps/wallet-mobile/src/yoroi-wallets/cardano/cip30.test.ts
rename to apps/wallet-mobile/src/yoroi-wallets/cardano/cip30/cip30.test.ts
index 0610a492d5..ac06e57f80 100644
--- a/apps/wallet-mobile/src/yoroi-wallets/cardano/cip30.test.ts
+++ b/apps/wallet-mobile/src/yoroi-wallets/cardano/cip30/cip30.test.ts
@@ -1,7 +1,7 @@
-import {mocks} from '../mocks'
-import {getMasterKeyFromMnemonic} from './byron/util'
+import {mocks} from '../../mocks'
+import {getMasterKeyFromMnemonic} from '../byron/util'
+import {YoroiWallet} from '../types'
 import {cip30ExtensionMaker} from './cip30'
-import {YoroiWallet} from './types'
 
 describe('cip30ExtensionMaker', () => {
   it('should support submitTx', async () => {
@@ -76,9 +76,26 @@ describe('cip30ExtensionMaker', () => {
 
   it('should support signTx', async () => {
     const cip30 = cip30ExtensionMaker(mocks.wallet)
-    const result = await cip30.signTx(await getMasterKeyFromMnemonic(mnemonic), txCbor, true)
+    const rootKey = await getMasterKeyFromMnemonic(mnemonic)
+    const result = await cip30.signTx(rootKey, txCbor, true)
     expect(result).toBeDefined()
   })
+
+  it('should support signData', async () => {
+    const rootKey = await getMasterKeyFromMnemonic(mnemonic)
+    const message = 'whatever'
+    const addressBech32 =
+      'addr1qynqc23tpx4dqps6xgqy9s2l3xz5fxu734wwmzj9uddn0h2z6epfcukqmswgwwfruxh7gaddv9x0d5awccwahnhwleqqc4zkh4'
+
+    const cip30 = cip30ExtensionMaker(mocks.wallet)
+    const result = await cip30.signData(rootKey, addressBech32, message)
+
+    expect(result).toEqual({
+      signature:
+        '845846a201276761646472657373583901260c2a2b09aad0061a320042c15f8985449b9e8d5ced8a45e35b37dd42d6429c72c0dc1c873923e1afe475ad614cf6d3aec61ddbceeefe40a166686173686564f448776861746576657258406a16fcb9cc6c3f7d83fdd623e8896d4b81c0ef6a9fb68d916794e2e4c3c0766666b485f71c6f1f56241cb30905cc18618c7e95721dba3e91bcd9918f51e8b90a',
+      key: 'a4010103272006215820be6a4d7e9789dd7458049c971ad783107e7f041c6f1f542b4530d63d5fe5afb1',
+    })
+  })
 })
 
 const mnemonic = [
diff --git a/apps/wallet-mobile/src/yoroi-wallets/cardano/cip30.ts b/apps/wallet-mobile/src/yoroi-wallets/cardano/cip30/cip30.ts
similarity index 88%
rename from apps/wallet-mobile/src/yoroi-wallets/cardano/cip30.ts
rename to apps/wallet-mobile/src/yoroi-wallets/cardano/cip30/cip30.ts
index f5457a20bc..d41cbf06ee 100644
--- a/apps/wallet-mobile/src/yoroi-wallets/cardano/cip30.ts
+++ b/apps/wallet-mobile/src/yoroi-wallets/cardano/cip30/cip30.ts
@@ -1,5 +1,6 @@
 import * as CSL from '@emurgo/cross-csl-core'
 import {WasmModuleProxy} from '@emurgo/cross-csl-core'
+import {init} from '@emurgo/cross-msl-mobile'
 import {RemoteUnspentOutput, signRawTransaction, UtxoAsset} from '@emurgo/yoroi-lib'
 import {normalizeToAddress} from '@emurgo/yoroi-lib/dist/internals/utils/addresses'
 import {parseTokenList} from '@emurgo/yoroi-lib/dist/internals/utils/assets'
@@ -9,22 +10,23 @@ import {BigNumber} from 'bignumber.js'
 import {Buffer} from 'buffer'
 import _ from 'lodash'
 
-import {RawUtxo, YoroiSignedTx, YoroiUnsignedTx} from '../types'
-import {asQuantity, Utxos} from '../utils'
-import {Cardano, CardanoMobile} from '../wallets'
-import {toAssetNameHex, toPolicyId} from './api'
-import {getTransactionSigners} from './common/signatureUtils'
-import {Pagination, YoroiWallet} from './types'
-import {createRawTxSigningKey, identifierToCardanoAsset} from './utils'
-import {collateralConfig, findCollateralCandidates, utxosMaker} from './utxoManager/utxos'
-import {wrappedCsl} from './wrappedCsl'
+import {RawUtxo, YoroiSignedTx, YoroiUnsignedTx} from '../../types'
+import {asQuantity, Utxos} from '../../utils'
+import {Cardano, CardanoMobile} from '../../wallets'
+import {toAssetNameHex, toPolicyId} from '../api'
+import * as cip8 from '../cip8/cip8'
+import {getDerivationPathForAddress, getTransactionSigners} from '../common/signatureUtils'
+import {Pagination, YoroiWallet} from '../types'
+import {createRawTxSigningKey, identifierToCardanoAsset} from '../utils'
+import {collateralConfig, findCollateralCandidates, utxosMaker} from '../utxoManager/utxos'
+import {wrappedCsl as getCSL} from '../wrappedCsl'
+
+const MSL = init('msl')
 
 export const cip30ExtensionMaker = (wallet: YoroiWallet) => {
   return new CIP30Extension(wallet)
 }
 
-const getCSL = () => wrappedCsl()
-
 const copy = async <T extends {toHex: () => Promise<string>}>(
   creator: {fromHex: (hex: string) => Promise<T>},
   value: T,
@@ -129,13 +131,33 @@ class CIP30Extension {
     return txId
   }
 
-  async signData(_rootKey: string, address: string, _payload: string): Promise<{signature: string; key: string}> {
+  async signData(rootKey: string, address: string, payload: string): Promise<{signature: string; key: string}> {
     const {csl, release} = getCSL()
     try {
+      const payloadInBytes = Buffer.from(payload, 'utf-8')
+
       const normalisedAddress = await normalizeToAddress(csl, address)
       const bech32Address = await normalisedAddress?.toBech32(undefined)
-      if (!bech32Address) throw new Error('Invalid wallet state')
-      throw new Error('Not implemented')
+      if (!bech32Address || !normalisedAddress) throw new Error('Invalid address')
+
+      const path = getDerivationPathForAddress(bech32Address, this.wallet, true)
+      const signingKey = await createRawTxSigningKey(rootKey, path)
+      const coseSign1 = await cip8.sign(Buffer.from(await normalisedAddress.toHex(), 'hex'), signingKey, payloadInBytes)
+      const key = await MSL.COSEKey.new(await MSL.Label.fromKeyType(MSL.KeyType.OKP))
+      await key.setAlgorithmId(await MSL.Label.fromAlgorithmId(MSL.AlgorithmId.EdDSA))
+      await key.setHeader(
+        await MSL.Label.newInt(await MSL.Int.newNegative(await MSL.BigNum.fromStr('1'))),
+        await MSL.CBORValue.newInt(await MSL.Int.newI32(6)),
+      )
+      await key.setHeader(
+        await MSL.Label.newInt(await MSL.Int.newNegative(await MSL.BigNum.fromStr('2'))),
+        await MSL.CBORValue.newBytes(await (await signingKey.toPublic()).asBytes()),
+      )
+
+      return {
+        signature: Buffer.from(await coseSign1.toBytes()).toString('hex'),
+        key: Buffer.from(await key.toBytes()).toString('hex'),
+      }
     } finally {
       release()
     }
diff --git a/apps/wallet-mobile/src/yoroi-wallets/cardano/cip8/cip8.test.ts b/apps/wallet-mobile/src/yoroi-wallets/cardano/cip8/cip8.test.ts
new file mode 100644
index 0000000000..46512b6d83
--- /dev/null
+++ b/apps/wallet-mobile/src/yoroi-wallets/cardano/cip8/cip8.test.ts
@@ -0,0 +1,36 @@
+import {normalizeToAddress} from '@emurgo/yoroi-lib/dist/internals/utils/addresses'
+import assert from 'assert'
+import {Buffer} from 'buffer'
+
+import {getMasterKeyFromMnemonic} from '../byron/util'
+import {harden} from '../common/signatureUtils'
+import {createRawTxSigningKey} from '../utils'
+import {wrappedCsl} from '../wrappedCsl'
+import * as cip8 from './cip8'
+
+describe('CIP8', () => {
+  it('should support signing', async () => {
+    const {csl} = wrappedCsl()
+    const bech32 =
+      'addr1qynqc23tpx4dqps6xgqy9s2l3xz5fxu734wwmzj9uddn0h2z6epfcukqmswgwwfruxh7gaddv9x0d5awccwahnhwleqqc4zkh4'
+    const payload = 'whatever'
+    const rootKey = await getMasterKeyFromMnemonic(mnemonic)
+    const path = [harden(1852), harden(1815), harden(0), 0, 0]
+    const signingKey = await createRawTxSigningKey(rootKey, path)
+
+    const payloadInBytes = Buffer.from(payload, 'utf-8')
+    const normalisedAddress = await normalizeToAddress(csl, bech32)
+    assert(normalisedAddress != null)
+    const coseSign1 = await cip8.sign(Buffer.from(await normalisedAddress.toHex(), 'hex'), signingKey, payloadInBytes)
+    const signature = Buffer.from(await coseSign1.toBytes()).toString('hex')
+    expect(signature).toEqual(
+      '845846a201276761646472657373583901260c2a2b09aad0061a320042c15f8985449b9e8d5ced8a45e35b37dd42d6429c72c0dc1c873923e1afe475ad614cf6d3aec61ddbceeefe40a166686173686564f448776861746576657258406a16fcb9cc6c3f7d83fdd623e8896d4b81c0ef6a9fb68d916794e2e4c3c0766666b485f71c6f1f56241cb30905cc18618c7e95721dba3e91bcd9918f51e8b90a',
+    )
+  })
+})
+
+const mnemonic = [
+  'dry balcony arctic what garbage sort',
+  'cart shine egg lamp manual bottom',
+  'slide assault bus',
+].join(' ')
diff --git a/apps/wallet-mobile/src/yoroi-wallets/cardano/cip8/cip8.ts b/apps/wallet-mobile/src/yoroi-wallets/cardano/cip8/cip8.ts
new file mode 100644
index 0000000000..8f9f56885f
--- /dev/null
+++ b/apps/wallet-mobile/src/yoroi-wallets/cardano/cip8/cip8.ts
@@ -0,0 +1,18 @@
+import {PrivateKey} from '@emurgo/cross-csl-core'
+import {init} from '@emurgo/cross-msl-mobile'
+import {Buffer} from 'buffer'
+
+const MSL = init('cip8')
+
+export const sign = async (address: Buffer, signKey: PrivateKey, payload: Buffer) => {
+  const protectedHeader = await MSL.HeaderMap.new()
+  await protectedHeader.setAlgorithmId(await MSL.Label.fromAlgorithmId(MSL.AlgorithmId.EdDSA))
+  await protectedHeader.setHeader(await MSL.Label.newText('address'), await MSL.CBORValue.newBytes(address))
+  const protectedSerialized = await MSL.ProtectedHeaderMap.new(protectedHeader)
+  const unprotected = await MSL.HeaderMap.new()
+  const headers = await MSL.Headers.new(protectedSerialized, unprotected)
+  const builder = await MSL.COSESign1Builder.new(headers, payload, false)
+  const toSign = await (await builder.makeDataToSign()).toBytes()
+  const signedSigStruct = await (await signKey.sign(toSign)).toBytes()
+  return builder.build(signedSigStruct)
+}
diff --git a/apps/wallet-mobile/src/yoroi-wallets/cardano/common/signatureUtils.ts b/apps/wallet-mobile/src/yoroi-wallets/cardano/common/signatureUtils.ts
index 430a5abe34..6abacd4abc 100644
--- a/apps/wallet-mobile/src/yoroi-wallets/cardano/common/signatureUtils.ts
+++ b/apps/wallet-mobile/src/yoroi-wallets/cardano/common/signatureUtils.ts
@@ -92,7 +92,7 @@ const arePathsEqual = (path1: number[], path2: number[]) => {
   return path1.every((value, index) => value === path2[index]) && path1.length === path2.length
 }
 
-const getDerivationPathForAddress = (address: string, wallet: YoroiWallet, partial = false) => {
+export const getDerivationPathForAddress = (address: string, wallet: YoroiWallet, partial = false) => {
   const internalIndex = wallet.internalAddresses.indexOf(address)
   const externalIndex = wallet.externalAddresses.indexOf(address)
   const purpose = isHaskellShelley(wallet.walletImplementationId)
diff --git a/yarn.lock b/yarn.lock
index f4535a9742..dd6999af1d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2054,6 +2054,11 @@
   resolved "https://registry.yarnpkg.com/@emotion/weak-memoize/-/weak-memoize-0.2.5.tgz#8eed982e2ee6f7f4e44c253e12962980791efd46"
   integrity sha512-6U71C2Wp7r5XtFtQzYrW5iKFT67OixrSxjI4MptCHzdSVlgabczzqLe0ZSgnub/5Kp4hSbpDB1tMytZY9pwxxA==
 
+"@emurgo/cardano-message-signing-nodejs@1.0.1":
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/@emurgo/cardano-message-signing-nodejs/-/cardano-message-signing-nodejs-1.0.1.tgz#b2fa1f7541055a6c4b8e805492b1a9362bea5835"
+  integrity sha512-PoKh1tQnJX18f8iEr8Jk1KXxKCn9eqaSslMI1pyOJvYRJhQVDLCh0+9YReufjp0oFJIY1ShcrR+4/WnECVZUKQ==
+
 "@emurgo/cardano-serialization-lib-nodejs@12.0.0-alpha.26":
   version "12.0.0-alpha.26"
   resolved "https://registry.yarnpkg.com/@emurgo/cardano-serialization-lib-nodejs/-/cardano-serialization-lib-nodejs-12.0.0-alpha.26.tgz#4e5fea7ba6d72888e21c5a9bea6bcff367834a4b"
@@ -2111,6 +2116,36 @@
     "@emurgo/cardano-serialization-lib-nodejs" "12.0.0-alpha.26"
     "@emurgo/cross-csl-core" "4.4.0"
 
+"@emurgo/cross-msl-core@1.0.0":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@emurgo/cross-msl-core/-/cross-msl-core-1.0.0.tgz#f66ec9491362e9d60c7c6142875af849ca788c98"
+  integrity sha512-X98tmVLYSpcLggky3R7iuvb9no/LdoPCR8YXH/CjVj4U5YoR9/6Xf2PQOxSQCBCeExHZ7fDo+gefwoSX6yRjow==
+  dependencies:
+    "@cardano-foundation/ledgerjs-hw-app-cardano" "^5.0.0"
+    "@types/mocha" "^9.1.1"
+    axios "^0.24.0"
+    bech32 "^2.0.0"
+    bignumber.js "^9.0.1"
+    blake2b "^2.1.4"
+    hash-wasm "^4.9.0"
+    mocha "^10.0.0"
+
+"@emurgo/cross-msl-mobile@^1.0.0":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@emurgo/cross-msl-mobile/-/cross-msl-mobile-1.0.0.tgz#677434190af90ed43fac46dd6c4c331ec0a0bcce"
+  integrity sha512-pHMc6P0TjskUAmeI52BId+w253M0EceolnN2m8xdFdqMw4FmrrdpLbfP4uqACHWiM3Vy419SzSczv1r/BHqCNw==
+  dependencies:
+    "@emurgo/cross-msl-core" "1.0.0"
+    "@emurgo/msl-mobile-bridge" "1.0.1"
+
+"@emurgo/cross-msl-nodejs@^1.0.0":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@emurgo/cross-msl-nodejs/-/cross-msl-nodejs-1.0.0.tgz#3079042d10c9b4d723fe7e77fc9c85559e8c3ee5"
+  integrity sha512-M2qxS8fo6SSddUXSjnjDNQY1Of/Ro+3a2HUZhTcvN/RRa3JLKU36i3YUqSpMhTxHN0GwCM6QCE7LddpZthpJeA==
+  dependencies:
+    "@emurgo/cardano-message-signing-nodejs" "1.0.1"
+    "@emurgo/cross-msl-core" "1.0.0"
+
 "@emurgo/csl-mobile-bridge@6.0.0-alpha.7":
   version "6.0.0-alpha.7"
   resolved "https://registry.yarnpkg.com/@emurgo/csl-mobile-bridge/-/csl-mobile-bridge-6.0.0-alpha.7.tgz#63349d0f2e70d568ce628849c8d8b085892531aa"
@@ -2125,6 +2160,20 @@
   dependencies:
     base-64 "0.1.0"
 
+"@emurgo/msl-mobile-bridge@1.0.1":
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/@emurgo/msl-mobile-bridge/-/msl-mobile-bridge-1.0.1.tgz#4a912e182118dc4462e90cbfda5ebedf6048b4e6"
+  integrity sha512-ed0KobdbEmNParq33pTkYOMWrF8kMP6R3HdIPDy/YycwW9nvvWlWhlpUR4wKDjM3qQzhE/rN6gb/dG8rwWa4IQ==
+  dependencies:
+    base-64 "0.1.0"
+
+"@emurgo/msl-mobile-bridge@^1.0.2":
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/@emurgo/msl-mobile-bridge/-/msl-mobile-bridge-1.0.2.tgz#3241ff5728a7b34b890641843b36c62b6876d09f"
+  integrity sha512-RQ+X8ovF09jPr3xwG1XVAr/O2YFVZFDGALbLPMEjszvSw12Su3FNgLGvMwXfSvL9T/csR0BF1NqkGauJONedmw==
+  dependencies:
+    base-64 "0.1.0"
+
 "@emurgo/react-native-blockies-svg@^0.0.2":
   version "0.0.2"
   resolved "https://registry.yarnpkg.com/@emurgo/react-native-blockies-svg/-/react-native-blockies-svg-0.0.2.tgz#afe2ce2776b0c6430ce3bc9a94ceb4f9fcb302f9"