Updated on 2026-08-14

.gitignore

@@ -1,20 +1,22 @@
 *.iml
-.gradle
-/local.properties
-/.idea/libraries
-/.idea/modules.xml
-/.idea/workspace.xml
-.DS_Store
+
+# Built application files
 /build
-/captures
-.externalNativeBuild
-.idea/vcs.xml
-.idea/caches
-.idea/dictionaries
-.idea/runConfigurations.xml
-.idea/encodings.xml
-.idea/codeStyles/codeStyleConfig.xml
-.idea/assetWizardSettings.xml
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Gradle generated files
+.gradle
+
+# User-specific configurations
+.idea/caches/
+.idea/libraries/
+.idea/*.xml
+
+# OS-specific files
+.DS_Store
+.DS_Store?
 
 # fastlane files
 **/fastlane/report.xml

tangem-core/src/main/java/com/tangem/CardManager.kt

@@ -176,6 +176,46 @@ class CardManager(
         runTask(task, cardId, callback)
     }
 
+    /**
+     * This command write some of User_Data, User_ProtectedData, User_Counter and User_ProtectedCounter fields.
+     * User_Data and User_ProtectedData are never changed or parsed by the executable code the Tangem COS.
+     * The App defines purpose of use, format and it's payload. For example, this field may contain cashed information
+     * from blockchain to accelerate preparing new transaction.
+     * User_Counter and User_ProtectedCounter are counters, that initial values can be set by App and increased on every signing
+     * of new transaction (on SIGN command that calculate new signatures). The App defines purpose of use.
+     * For example, this fields may contain blockchain nonce value.
+     *
+     * Writing of User_Counter and User_Data protected only by PIN1.
+     * User_ProtectedCounter and User_ProtectedData additionaly need PIN2 to confirmation.
+     */
+    fun writeUserData(
+        cardId: String,
+        userData: ByteArray? = null,
+        userProtectedData: ByteArray? = null,
+        userCounter: Int? = null,
+        userProtectedCounter: Int? = null,
+        callback: (result: TaskEvent<WriteUserDataResponse>) -> Unit
+    ) {
+      val writeUserDataCommand = WriteUserDataCommand(userData, userProtectedData, userCounter, userProtectedCounter)
+      val task = SingleCommandTask(writeUserDataCommand)
+      runTask(task, cardId, callback)
+    }
+
+    /**
+     * This command returns two up to 512-byte User_Data, User_Protected_Data and two counters User_Counter and
+     * User_Protected_Counter fields.
+     * User_Data and User_ProtectedData are never changed or parsed by the executable code the Tangem COS.
+     * The App defines purpose of use, format and it's payload. For example, this field may contain cashed information
+     * from blockchain to accelerate preparing new transaction.
+     * User_Counter and User_ProtectedCounter are counters, that initial values can be set by App and increased on every signing
+     * of new transaction (on SIGN command that calculate new signatures). The App defines purpose of use.
+     * For example, this fields may contain blockchain nonce value.
+     */
+    fun readUserData(cardId: String, callback: (result: TaskEvent<ReadUserDataResponse>) -> Unit) {
+      val task = SingleCommandTask(ReadUserDataCommand())
+      runTask(task, cardId, callback)
+    }
+
     /**
      * This command will create a new wallet on the card having ‘Empty’ state.
      * A key pair WalletPublicKey / WalletPrivateKey is generated and securely stored in the card.
@@ -210,8 +250,7 @@ class CardManager(
     /**
 
      */
-    fun <T> runTask(task: Task<T>, cardId: String? = null,
-                    callback: (result: TaskEvent<T>) -> Unit) {
+    fun <T> runTask(task: Task<T>, cardId: String? = null, callback: (result: TaskEvent<T>) -> Unit) {
         if (isBusy) {
             callback(TaskEvent.Completion(TaskError.Busy()))
             return

tangem-core/src/main/java/com/tangem/commands/ReadUserDataCommand.kt

@@ -0,0 +1,79 @@
+package com.tangem.commands
+
+import com.tangem.common.CardEnvironment
+import com.tangem.common.apdu.CommandApdu
+import com.tangem.common.apdu.Instruction
+import com.tangem.common.apdu.ResponseApdu
+import com.tangem.common.tlv.TlvBuilder
+import com.tangem.common.tlv.TlvMapper
+import com.tangem.common.tlv.TlvTag
+import com.tangem.tasks.TaskError
+
+/**
+[REDACTED_AUTHOR]
+ */
+class ReadUserDataResponse(
+    /**
+     * CID, Unique Tangem card ID number.
+     */
+    val cardId: String,
+
+    /**
+     * Data defined by user's App.
+     */
+    val userData: ByteArray,
+
+    /**
+     * Data defined by user's App (confirmed by PIN2).
+     */
+    val userProtectedData: ByteArray,
+
+    /**
+     * Counter initialized by user's App and increased on every signing of new transaction
+     */
+    val userCounter: Int,
+
+    /**
+     * Counter initialized by user's App (confirmed by PIN2) and increased on every signing of new transaction
+     */
+    val userProtectedCounter: Int
+
+): CommandResponse
+
+/**
+ * This command returns two up to 512-byte User_Data, User_Protected_Data and two counters User_Counter and
+ * User_Protected_Counter fields.
+ * User_Data and User_ProtectedData are never changed or parsed by the executable code the Tangem COS.
+ * The App defines purpose of use, format and it's payload. For example, this field may contain cashed information
+ * from blockchain to accelerate preparing new transaction.
+ * User_Counter and User_ProtectedCounter are counters, that initial values can be set by App and increased on every signing
+ * of new transaction (on SIGN command that calculate new signatures). The App defines purpose of use.
+ * For example, this fields may contain blockchain nonce value.
+ */
+class ReadUserDataCommand: CommandSerializer<ReadUserDataResponse>() {
+
+  override fun serialize(cardEnvironment: CardEnvironment): CommandApdu {
+    val builder = TlvBuilder()
+    builder.append(TlvTag.CardId, cardEnvironment.cardId)
+    builder.append(TlvTag.Pin, cardEnvironment.pin1)
+
+    return CommandApdu(Instruction.ReadUserData, builder.serialize())
+  }
+
+  override fun deserialize(cardEnvironment: CardEnvironment, responseApdu: ResponseApdu): ReadUserDataResponse? {
+    val tlvData = responseApdu.getTlvData() ?: return null
+
+    return try {
+      val mapper = TlvMapper(tlvData)
+      ReadUserDataResponse(
+          cardId = mapper.map(TlvTag.CardId),
+          userData = mapper.map(TlvTag.UserData),
+          userProtectedData = mapper.map(TlvTag.UserProtectedData),
+          userCounter = mapper.map(TlvTag.UserCounter),
+          userProtectedCounter = mapper.map(TlvTag.UserProtectedCounter)
+      )
+    } catch (exception: Exception) {
+      throw TaskError.SerializeCommandError()
+    }
+  }
+}

tangem-core/src/main/java/com/tangem/commands/WriteUserDataCommand.kt

@@ -0,0 +1,62 @@
+package com.tangem.commands
+
+import com.tangem.common.CardEnvironment
+import com.tangem.common.apdu.CommandApdu
+import com.tangem.common.apdu.Instruction
+import com.tangem.common.apdu.ResponseApdu
+import com.tangem.common.tlv.TlvBuilder
+import com.tangem.common.tlv.TlvMapper
+import com.tangem.common.tlv.TlvTag
+import com.tangem.tasks.TaskError
+
+/**
+[REDACTED_AUTHOR]
+ */
+
+class WriteUserDataResponse(
+    /**
+     * CID, Unique Tangem card ID number.
+     */
+    val cardId: String
+): CommandResponse
+
+/**
+ * This command write some of User_Data, User_ProtectedData, User_Counter and User_ProtectedCounter fields.
+ * User_Data and User_ProtectedData are never changed or parsed by the executable code the Tangem COS.
+ * The App defines purpose of use, format and it's payload. For example, this field may contain cashed information
+ * from blockchain to accelerate preparing new transaction.
+ * User_Counter and User_ProtectedCounter are counters, that initial values can be set by App and increased on every signing
+ * of new transaction (on SIGN command that calculate new signatures). The App defines purpose of use.
+ * For example, this fields may contain blockchain nonce value.
+ *
+ * Writing of User_Counter and User_Data protected only by PIN1.
+ * User_ProtectedCounter and User_ProtectedData additionaly need PIN2 to confirmation.
+ */
+class WriteUserDataCommand(private val userData: ByteArray? = null, private val userProtectedData: ByteArray? = null,
+    private val userCounter: Int? = null,
+    private val userProtectedCounter: Int? = null): CommandSerializer<WriteUserDataResponse>() {
+
+  override fun serialize(cardEnvironment: CardEnvironment): CommandApdu {
+    val builder = TlvBuilder()
+    builder.append(TlvTag.CardId, cardEnvironment.cardId)
+    builder.append(TlvTag.Pin, cardEnvironment.pin1)
+    builder.append(TlvTag.UserData, userData)
+    builder.append(TlvTag.UserCounter, userCounter)
+    builder.append(TlvTag.UserProtectedData, userProtectedData)
+    builder.append(TlvTag.UserProtectedCounter, userProtectedCounter)
+    if (userProtectedCounter != null || userProtectedData != null)
+      builder.append(TlvTag.Pin2, cardEnvironment.pin2)
+
+    return CommandApdu(Instruction.WriteUserData, builder.serialize())
+  }
+
+  override fun deserialize(cardEnvironment: CardEnvironment, responseApdu: ResponseApdu): WriteUserDataResponse? {
+    val tlvData = responseApdu.getTlvData() ?: return null
+
+    return try {
+      WriteUserDataResponse(TlvMapper(tlvData).map(TlvTag.CardId))
+    } catch (exception: Exception) {
+      throw TaskError.SerializeCommandError()
+    }
+  }
+}

tangem-core/src/main/java/com/tangem/common/apdu/Instruction.kt

@@ -18,7 +18,9 @@ enum class Instruction(var code: Int) {
     Sign(0xFB),
     PurgeWallet(0xFC),
     Activate(0xFE),
-    OpenSession(0xFF);
+    OpenSession(0xFF),
+    WriteUserData(0xE0),
+    ReadUserData(0xE1);
 
 
     companion object {

tangem-core/src/main/java/com/tangem/common/tlv/TlvTag.kt

@@ -94,7 +94,6 @@ enum class TlvTag(val code: Int) {
 
     ProductMask(0x8A),
     PaymentFlowVersion(0x54),
-    UserCounter(0x2C),
 
 
     TokenSymbol(0xA0),
@@ -107,7 +106,12 @@ enum class TlvTag(val code: Int) {
 
     TerminalIsLinked(0x58),
     TerminalPublicKey(0x5C),
-    TerminalTransactionSignature(0x57);
+    TerminalTransactionSignature(0x57),
+
+    UserData(0x2A),
+    UserProtectedData(0x2B),
+    UserCounter(0x2C),
+    UserProtectedCounter(0x2D);
 
     /**
      * @return [TlvValueType] associated with a [TlvTag]
@@ -121,7 +125,7 @@ enum class TlvTag(val code: Int) {
             MaxSignatures, PauseBeforePin2, RemainingSignatures,
             SignedHashes, Health, TokenDecimal,
             Offset, Size -> TlvValueType.Uint16
-            UserCounter, IssuerDataCounter -> TlvValueType.Uint32
+            UserCounter, UserProtectedCounter, IssuerDataCounter -> TlvValueType.Uint32
             IsActivated, TerminalIsLinked -> TlvValueType.BoolValue
             ManufactureDateTime -> TlvValueType.DateTime
             ProductMask -> TlvValueType.ProductMask

tangem-demo/src/main/AndroidManifest.xml

@@ -16,6 +16,7 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
+
         <activity android:name=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -46,6 +47,32 @@
                 android:name="android.nfc.action.TECH_DISCOVERED"
                 android:resource="@xml/nfc_tech_filter" />
         </activity>
+
+      <activity android:name=".TestUserDataActivity">
+        <intent-filter>
+          <action android:name="android.nfc.action.NDEF_DISCOVERED" />
+          <category android:name="android.intent.category.DEFAULT" />
+          <data
+            android:host="www.tangem.com"
+            android:scheme="http" />
+          <data
+            android:host="www.tangem.com"
+            android:scheme="https" />
+          <data
+            android:host="tangem.com"
+            android:scheme="http" />
+          <data
+            android:host="tangem.com"
+            android:scheme="https" />
+        </intent-filter>
+        <intent-filter>
+          <action android:name="android.nfc.action.TECH_DISCOVERED" />
+        </intent-filter>
+
+        <meta-data
+          android:name="android.nfc.action.TECH_DISCOVERED"
+          android:resource="@xml/nfc_tech_filter" />
+      </activity>
     </application>
 
 </manifest>

tangem-demo/src/main/java/com/tangem/tangemtest/MainActivity.kt

@@ -1,13 +1,9 @@
 package com.tangem.tangemtest
 
+import android.content.Intent
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import com.tangem.CardManager
-import com.tangem.common.extensions.hexToBytes
-import com.tangem.common.extensions.toByteArray
-import com.tangem.common.extensions.toHexString
-import com.tangem.crypto.CryptoUtils
-import com.tangem.crypto.sign
 import com.tangem.tangem_sdk_new.extensions.init
 import com.tangem.tasks.ScanEvent
 import com.tangem.tasks.TaskError
@@ -154,6 +150,7 @@ class MainActivity : AppCompatActivity() {
                 }
             }
         }
+        btn_read_write_user_data?.setOnClickListener { startActivity(Intent(this, TestUserDataActivity::class.java)) }
     }
 
     private fun createSampleHashes(): Array<ByteArray> {

tangem-demo/src/main/java/com/tangem/tangemtest/TestUserDataActivity.kt

@@ -0,0 +1,180 @@
+package com.tangem.tangemtest
+
+import android.os.Bundle
+import android.view.View
+import android.widget.CompoundButton
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import com.tangem.CardManager
+import com.tangem.commands.ReadUserDataResponse
+import com.tangem.commands.WriteUserDataResponse
+import com.tangem.common.CardEnvironment
+import com.tangem.tangem_sdk_new.extensions.init
+import com.tangem.tasks.ScanEvent
+import com.tangem.tasks.TaskError
+import com.tangem.tasks.TaskEvent
+import kotlinx.android.synthetic.main.activity_test_user_data.*
+import java.nio.charset.StandardCharsets
+
+/**
+[REDACTED_AUTHOR]
+ */
+class TestUserDataActivity: AppCompatActivity() {
+
+  private lateinit var cardManager: CardManager
+  private lateinit var writeOptions: WriteOptions
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    setContentView(R.layout.activity_test_user_data)
+
+    init()
+    initWriteOptions()
+  }
+
+  private fun init() {
+    cardManager = CardManager.init(this)
+
+    btn_scan?.setOnClickListener { _ ->
+      cardManager.scanCard { taskEvent ->
+        when (taskEvent) {
+          is TaskEvent.Event -> {
+            when (taskEvent.data) {
+              is ScanEvent.OnReadEvent -> {
+                // Handle returned card data
+                writeOptions.cardId = (taskEvent.data as ScanEvent.OnReadEvent).card.cardId
+                runOnUiThread { showReadWriteSection(true) }
+              }
+              is ScanEvent.OnVerifyEvent -> {
+                //Handle card verification
+              }
+            }
+          }
+          is TaskEvent.Completion -> {
+            if (taskEvent.error != null) {
+              if (taskEvent.error is TaskError.UserCancelled) {
+                // Handle case when user cancelled manually
+              }
+              // Handle other errors
+            }
+            // Handle completion
+          }
+        }
+      }
+    }
+
+    btn_write.setOnClickListener {
+      if (writeOptions.cardId == null) return@setOnClickListener
+
+      cardManager.writeUserData(
+          writeOptions.cardId !!,
+          writeOptions.userData,
+          writeOptions.userProtectedData,
+          writeOptions.userCounter,
+          writeOptions.userProtectedCounter
+      ) {
+        when (it) {
+          is TaskEvent.Completion -> handleError(tv_write_result, it.error)
+          is TaskEvent.Event -> {
+            runOnUiThread {
+              val data = it.data as? WriteUserDataResponse
+              if (data == null) {
+                tv_write_result.text = "Response doesn't match"
+                return@runOnUiThread
+              }
+              tv_write_result?.text = "Success"
+            }
+          }
+        }
+      }
+    }
+
+    btn_read.setOnClickListener {
+      if (writeOptions.cardId == null) return@setOnClickListener
+
+      cardManager.readUserData(writeOptions.cardId !!) {
+        when (it) {
+          is TaskEvent.Completion -> handleError(tv_read_result, it.error)
+          is TaskEvent.Event -> {
+            runOnUiThread {
+              val data = it.data as? ReadUserDataResponse
+              if (data == null) {
+                tv_read_result.text = "Response doesn't match"
+                return@runOnUiThread
+              }
+              tv_read_result?.text = "Success"
+
+              writeOptions.userData = data.userData
+              writeOptions.userProtectedData = data.userProtectedData
+              writeOptions.userCounter = data.userCounter
+              writeOptions.userProtectedCounter = data.userProtectedCounter
+
+              tv_card_cid.text = data.cardId
+              tv_data.text = String(data.userData, StandardCharsets.US_ASCII)
+              tv_protected_data.text = String(data.userProtectedData, StandardCharsets.US_ASCII)
+              tv_counter.text = data.userCounter.toString()
+              tv_protected_counter.text = data.userProtectedCounter.toString()
+            }
+
+          }
+        }
+      }
+    }
+  }
+
+  private fun handleError(tv: TextView, error: TaskError?) {
+    val er = error ?: return
+    if (er is TaskError.UserCancelled) return
+
+    runOnUiThread { tv.text = er::class.simpleName }
+  }
+
+  private fun initWriteOptions() {
+    writeOptions = WriteOptions()
+
+    chb_with_ud.setOnCheckedChangeListener { buttonView, isChecked -> writeOptions.updateData(buttonView) }
+    chb_with_ud_protected.setOnCheckedChangeListener { buttonView, isChecked -> writeOptions.updateProtectedData(buttonView) }
+    chb_with_counter.setOnCheckedChangeListener { buttonView, isChecked -> writeOptions.updateCounter(buttonView) }
+    chb_with_protected_counter.setOnCheckedChangeListener { buttonView, isChecked -> writeOptions.updateProtectedCounter(buttonView) }
+    chb_with_pin2.setOnCheckedChangeListener { buttonView, isChecked -> writeOptions.updatePin2(buttonView) }
+  }
+
+  private fun showReadWriteSection(show: Boolean) {
+    val state = if (show) View.VISIBLE else View.GONE
+    cl_read_write.visibility = state
+  }
+}
+
+class WriteOptions {
+  var cardId: String? = null
+  var userData: ByteArray? = null
+  var userProtectedData: ByteArray? = null
+  var userCounter: Int? = null
+  var userProtectedCounter: Int? = null
+  var pin2: String? = null
+
+  fun updateData(chbx: CompoundButton) {
+    val value = "simple user data".toByteArray()
+    userData = if (chbx.isChecked) value else null
+  }
+
+  fun updateProtectedData(chbx: CompoundButton) {
+    val value = "protected user data".toByteArray()
+    userProtectedData = if (chbx.isChecked) value else null
+  }
+
+  fun updateCounter(chbx: CompoundButton) {
+    val value = if (userCounter == null) 0 else userCounter !! + 1
+    userCounter = if (chbx.isChecked) value else null
+  }
+
+  fun updateProtectedCounter(chbx: CompoundButton) {
+    val value = if (userProtectedCounter == null) 0 else userProtectedCounter !! + 1
+    userProtectedCounter = if (chbx.isChecked) value else null
+  }
+
+  fun updatePin2(chbx: CompoundButton) {
+    val value = CardEnvironment.DEFAULT_PIN2
+    pin2 = if (chbx.isChecked) value else null
+  }
+}

tangem-demo/src/main/res/layout/activity_main.xml

@@ -1,101 +1,116 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto"
+  xmlns:tools="http://schemas.android.com/tools"
+  android:layout_width="match_parent"
+  android:layout_height="match_parent">
+
+  <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/container"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
     <TextView
-        android:paddingBottom="48dp"
-        android:layout_marginTop="48dp"
-        android:id="@+id/tv_card_cid"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:padding="16dp"
-        android:layout_marginBottom="80dp"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent"
-        android:textAppearance="@style/TextAppearance.AppCompat.Large"/>
+      android:id="@+id/tv_card_cid"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="48dp"
+      android:layout_marginBottom="80dp"
+      android:padding="16dp"
+      android:paddingBottom="48dp"
+      android:textAppearance="@style/TextAppearance.AppCompat.Large"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent"
+      app:layout_constraintTop_toTopOf="parent" />
 
     <Button
-        android:id="@+id/btn_scan"
-        android:layout_width="200dp"
-        android:layout_height="wrap_content"
-        android:text="Read and verify card"
-        app:layout_constraintVertical_bias="0.3"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+      android:id="@+id/btn_scan"
+      android:layout_width="200dp"
+      android:layout_height="wrap_content"
+      android:text="Read and verify card"
+      app:layout_constraintBottom_toBottomOf="parent"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent"
+      app:layout_constraintTop_toTopOf="parent"
+      app:layout_constraintVertical_bias="0.25" />
 
     <Button
-        android:id="@+id/btn_sign"
-        android:layout_marginTop="16dp"
-        android:layout_width="200dp"
-        android:layout_height="wrap_content"
-        android:text="Sign transaction"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/btn_scan"
-        android:enabled="false"/>
+      android:id="@+id/btn_sign"
+      android:layout_width="200dp"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="16dp"
+      android:enabled="false"
+      android:text="Sign transaction"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent"
+      app:layout_constraintTop_toBottomOf="@id/btn_scan" />
 
     <Button
-        android:id="@+id/btn_read_issuer_data"
-        android:layout_marginTop="16dp"
-        android:layout_width="200dp"
-        android:layout_height="wrap_content"
-        android:text="Read issuer data"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/btn_sign"
-        android:enabled="false"/>
+      android:id="@+id/btn_read_issuer_data"
+      android:layout_width="200dp"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="16dp"
+      android:enabled="false"
+      android:text="Read issuer data"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent"
+      app:layout_constraintTop_toBottomOf="@id/btn_sign" />
 
     <Button
-        android:id="@+id/btn_write_issuer_data"
-        android:layout_marginTop="16dp"
-        android:layout_width="200dp"
-        android:layout_height="wrap_content"
-        android:text="Write issuer data"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/btn_read_issuer_data"
-        android:enabled="false"/>
+      android:id="@+id/btn_write_issuer_data"
+      android:layout_width="200dp"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="16dp"
+      android:enabled="false"
+      android:text="Write issuer data"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent"
+      app:layout_constraintTop_toBottomOf="@id/btn_read_issuer_data" />
 
     <Button
-        android:id="@+id/btn_read_issuer_extra_data"
-        android:layout_marginTop="16dp"
-        android:layout_width="200dp"
-        android:layout_height="wrap_content"
-        android:text="Read issuer extra data"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/btn_write_issuer_data"
-        android:enabled="false"/>
+      android:id="@+id/btn_read_issuer_extra_data"
+      android:layout_width="200dp"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="16dp"
+      android:enabled="false"
+      android:text="Read issuer extra data"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent"
+      app:layout_constraintTop_toBottomOf="@id/btn_write_issuer_data" />
 
     <Button
-        android:id="@+id/btn_purge_wallet"
-        android:layout_marginTop="16dp"
-        android:layout_width="200dp"
-        android:layout_height="wrap_content"
-        android:text="Purge wallet"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/btn_read_issuer_extra_data"
-        android:enabled="false"/>
+      android:id="@+id/btn_purge_wallet"
+      android:layout_width="200dp"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="16dp"
+      android:enabled="false"
+      android:text="Purge wallet"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent"
+      app:layout_constraintTop_toBottomOf="@id/btn_read_issuer_extra_data" />
 
     <Button
-        android:id="@+id/btn_create_wallet"
-        android:layout_marginTop="16dp"
-        android:layout_width="200dp"
-        android:layout_height="wrap_content"
-        android:text="Create wallet"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/btn_purge_wallet"
-        android:enabled="false"/>
+      android:id="@+id/btn_create_wallet"
+      android:layout_width="200dp"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="16dp"
+      android:enabled="false"
+      android:text="Create wallet"
+      app:layout_constraintLeft_toLeftOf="parent"
+      app:layout_constraintRight_toRightOf="parent"
+      app:layout_constraintTop_toBottomOf="@id/btn_purge_wallet" />
 
+    <Button
+      android:id="@+id/btn_read_write_user_data"
+      android:layout_width="200dp"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="16dp"
+      android:text="Read/Write user data"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toBottomOf="@+id/btn_create_wallet" />
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+  </androidx.constraintlayout.widget.ConstraintLayout>
+
+</ScrollView>

tangem-demo/src/main/res/layout/activity_test_user_data.xml

@@ -0,0 +1,238 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto"
+  xmlns:tools="http://schemas.android.com/tools"
+  android:layout_width="match_parent"
+  android:layout_height="match_parent"
+  android:orientation="vertical">
+
+  <Button
+    android:id="@+id/btn_scan"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:layout_gravity="center_horizontal"
+    android:layout_marginTop="16dp"
+    android:text="Scan card" />
+
+  <androidx.constraintlayout.widget.ConstraintLayout
+    android:id="@+id/cl_read_write"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:animateLayoutChanges="true"
+    android:orientation="vertical"
+    android:visibility="gone">
+
+    <LinearLayout
+      android:id="@+id/linearLayout"
+      android:layout_width="0dp"
+      android:layout_height="wrap_content"
+      android:layout_marginStart="16dp"
+      android:layout_marginEnd="16dp"
+      android:orientation="vertical"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toTopOf="parent">
+
+      <CheckBox
+        android:id="@+id/chb_with_ud"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="With User data" />
+
+      <CheckBox
+        android:id="@+id/chb_with_ud_protected"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="With User protected data" />
+
+      <CheckBox
+        android:id="@+id/chb_with_pin2"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="With Pin2" />
+
+      <CheckBox
+        android:id="@+id/chb_with_counter"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="With User counter" />
+
+      <CheckBox
+        android:id="@+id/chb_with_protected_counter"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="With User protected counter" />
+    </LinearLayout>
+
+    <Button
+      android:id="@+id/btn_write"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:layout_marginStart="16dp"
+      android:layout_marginTop="16dp"
+      android:text="Write user data"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toBottomOf="@+id/linearLayout" />
+
+    <androidx.constraintlayout.widget.Guideline
+      android:id="@+id/guideline2"
+      android:layout_width="wrap_content"
+      android:layout_height="wrap_content"
+      android:orientation="vertical"
+      app:layout_constraintGuide_begin="205dp" />
+
+    <TextView
+      android:id="@+id/tv_write_result"
+      android:layout_width="0dp"
+      android:layout_height="wrap_content"
+      android:text="Write result"
+      app:layout_constraintBottom_toBottomOf="@+id/btn_write"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="@+id/guideline2"
+      app:layout_constraintTop_toTopOf="@+id/btn_write" />
+
+    <include
+      android:id="@+id/m_delimiter_h"
+      layout="@layout/m_delimiter_h"
+      android:layout_width="0dp"
+      android:layout_height="@dimen/delimiter_size"
+      android:layout_marginTop="16dp"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toBottomOf="@+id/btn_write" />
+
+    <Button
+      android:id="@+id/btn_read"
+      android:layout_width="170dp"
+      android:layout_height="wrap_content"
+      android:layout_marginStart="16dp"
+      android:layout_marginTop="16dp"
+      android:text="Read User Data"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toBottomOf="@+id/m_delimiter_h" />
+
+    <TextView
+      android:id="@+id/tv_read_result"
+      android:layout_width="0dp"
+      android:layout_height="wrap_content"
+      android:text="Read result"
+      app:layout_constraintBottom_toBottomOf="@+id/btn_read"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="@+id/guideline2"
+      app:layout_constraintTop_toTopOf="@+id/btn_read" />
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+      android:layout_width="0dp"
+      android:layout_height="0dp"
+      android:layout_marginStart="20dp"
+      android:layout_marginTop="8dp"
+      android:layout_marginEnd="16dp"
+      app:layout_constraintBottom_toBottomOf="parent"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintHorizontal_bias="0.0"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toBottomOf="@+id/btn_read"
+      app:layout_constraintVertical_bias="0.0">
+
+      <androidx.constraintlayout.widget.Guideline
+        android:id="@+id/guideline"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        app:layout_constraintGuide_begin="156dp" />
+
+      <TextView
+        android:id="@+id/textView6"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Card Id:"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+      <TextView
+        android:id="@+id/textView7"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:text="User data:"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/textView6" />
+
+      <TextView
+        android:id="@+id/textView8"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:text="User protected data:"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/textView7" />
+
+      <TextView
+        android:id="@+id/textView9"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:text="User counter:"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/textView8" />
+
+      <TextView
+        android:id="@+id/textView10"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        android:text="User protected counter:"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/textView9" />
+
+
+      <TextView
+        android:id="@+id/tv_card_cid"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintStart_toStartOf="@+id/guideline"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:text="card id" />
+
+      <TextView
+        android:id="@+id/tv_data"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        app:layout_constraintStart_toStartOf="@+id/tv_card_cid"
+        app:layout_constraintTop_toBottomOf="@+id/textView6"
+        tools:text="data" />
+
+      <TextView
+        android:id="@+id/tv_protected_data"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        app:layout_constraintStart_toStartOf="@+id/tv_data"
+        app:layout_constraintTop_toBottomOf="@+id/textView7"
+        tools:text="protected data" />
+
+      <TextView
+        android:id="@+id/tv_counter"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        app:layout_constraintStart_toStartOf="@+id/tv_protected_data"
+        app:layout_constraintTop_toBottomOf="@+id/tv_protected_data"
+        tools:text="counter" />
+
+      <TextView
+        android:id="@+id/tv_protected_counter"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp"
+        app:layout_constraintStart_toStartOf="@+id/tv_counter"
+        app:layout_constraintTop_toBottomOf="@+id/tv_counter"
+        tools:text="protected counter" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+
+  </androidx.constraintlayout.widget.ConstraintLayout>
+
+</androidx.appcompat.widget.LinearLayoutCompat>

tangem-demo/src/main/res/layout/m_delimiter_h.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+  android:id="@+id/m_delimiter_h"
+  android:layout_width="match_parent"
+  android:layout_height="@dimen/delimiter_size"
+  android:background="@color/delimiter"
+  android:orientation="vertical" />

tangem-demo/src/main/res/values/colors.xml

@@ -3,4 +3,6 @@
     <color name="colorPrimary">#027aff</color>
     <color name="colorPrimaryDark">#027AFF</color>
     <color name="colorAccent">#027AFF</color>
+
+    <color name="delimiter">#000000</color>
 </resources>

tangem-demo/src/main/res/values/dimens.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+  <dimen name="delimiter_size">1dp</dimen>
+
+</resources>