Updated on 2026-08-14

app/src/main/java/com/tangem/data/Blockchain.java

@@ -23,12 +23,13 @@ public enum Blockchain {
     BinanceTestNet("BINANCE/test", "BNB", 100000000.0, R.drawable.tangem2, "Binance Testnet"),
     Matic("MATIC", "MTX", 1.0, R.drawable.tangem2, "Matic"),
     MaticTestNet("MATIC/test", "MTX", 1.0, R.drawable.tangem2, "Matic Testnet"),
-    Stellar("XLM", "XLM", 1000000.0, R.drawable.ic_logo_stellar, "Stellar"),
-    StellarTestNet("XLM/test", "XLM", 1000000.0, R.drawable.ic_logo_stellar, "Stellar Testnet"),
+    Stellar("XLM", "XLM", 10000000.0, R.drawable.ic_logo_stellar, "Stellar"),
+    StellarTestNet("XLM/test", "XLM", 10000000.0, R.drawable.ic_logo_stellar, "Stellar Testnet"),
     StellarAsset("Asset", "XLM", 10000000.0, R.drawable.ic_logo_stellar, "Stellar"),
     StellarTag("XLM-Tag", "XLM", 1000000.0, R.drawable.ic_logo_stellar, "Stellar"),
     Eos("EOS", "EOS", 10000.0, R.drawable.tangem2, "EOS"),
-    Ducatus("DUC", "DUC", 100000000.0, R.drawable.tangem2, "Ducatus");
+    Ducatus("DUC", "DUC", 100000000.0, R.drawable.tangem2, "Ducatus"),
+    Tezos("TEZOS", "XTZ", 10000000.0, R.drawable.tangem2, "Tezos");
 
     Blockchain(String ID, String currency, double multiplier, int imageResource, String officialName) {
         mID = ID;

app/src/main/java/com/tangem/data/network/ServerApiTezos.java

@@ -0,0 +1,139 @@
+package com.tangem.data.network;
+
+import com.jakewharton.retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
+import com.tangem.data.network.model.TezosAccountResponse;
+import com.tangem.data.network.model.TezosForgeBody;
+import com.tangem.data.network.model.TezosHeaderResponse;
+import com.tangem.data.network.model.TezosPreapplyBody;
+import com.tangem.tangem_card.util.Log;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import io.reactivex.Single;
+import io.reactivex.SingleObserver;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.schedulers.Schedulers;
+import okhttp3.OkHttpClient;
+import okhttp3.logging.HttpLoggingInterceptor;
+import retrofit2.Response;
+import retrofit2.Retrofit;
+import retrofit2.converter.gson.GsonConverterFactory;
+import retrofit2.converter.scalars.ScalarsConverterFactory;
+
+public class ServerApiTezos {
+    private static String TAG = ServerApiTezos.class.getSimpleName();
+
+    private final String letzbakeURI = "https://teznode.letzbake.com";
+    private final String tezrpcURI = "https://mainnet.tezrpc.me";
+
+    static final String TEZOS_ADDRESS = "chains/main/blocks/head/context/contracts/{address}";
+    static final String TEZOS_HEADER = "chains/main/blocks/head/header";
+    static final String TEZOS_MANAGER_KEY = "chains/main/blocks/head/context/contracts/{address}/manager_key";
+    static final String TEZOS_FORGE_OPERATIONS = "chains/main/blocks/head/helpers/forge/operations";
+    static final String TEZOS_PREAPPLY_OPERATIONS = "chains/main/blocks/head/helpers/preapply/operations";
+    static final String TEZOS_RUN_OPERATION = "chains/main/blocks/head/helpers/scripts/run_operation";
+    static final String TEZOS_INJECT_OPERATIONS = "injection/operation";
+
+    private Retrofit retrofitTezos = new Retrofit.Builder()
+            .baseUrl(letzbakeURI)
+            .addConverterFactory(GsonConverterFactory.create())
+            .addConverterFactory(ScalarsConverterFactory.create())
+            .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
+            //logging for testing
+            .client(new OkHttpClient.Builder().addInterceptor(
+                    new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY)
+            ).build())
+
+            .build();
+
+    private TezosApi tezosApi = retrofitTezos.create(TezosApi.class);
+
+    private int requestsCount = 0;
+
+    public boolean isRequestsSequenceCompleted() {
+        Log.i(TAG, String.format("isRequestsSequenceCompleted: %s (%d requests left)", String.valueOf(requestsCount <= 0), requestsCount));
+        return requestsCount <= 0;
+    }
+
+    public void getAddress(String wallet, SingleObserver<TezosAccountResponse> accountObserver) {
+        requestsCount++;
+        Log.i(TAG, "new getAddress request");
+
+        Single<TezosAccountResponse> accountSingle = tezosApi.getAccount(wallet)
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .doOnEvent((object, throwable) -> requestsCount--);
+
+        accountSingle.subscribe(accountObserver);
+    }
+
+    public void getMangerKey(String wallet, SingleObserver<String> accountObserver) {
+        requestsCount++;
+        Log.i(TAG, "new getManagerKey request");
+
+        Single<String> managerKeySingle = tezosApi.getManagerKey(wallet)
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .doOnEvent((object, throwable) -> requestsCount--);
+
+        managerKeySingle.subscribe(accountObserver);
+    }
+
+    public TezosHeaderResponse getHeader() throws Exception { // TODO? not async
+        requestsCount++;
+        Log.i(TAG, "new getHeader request");
+
+        Response<TezosHeaderResponse> headerResponse = tezosApi.getHeader().execute();
+
+        requestsCount--;
+        if (headerResponse.code() == 200) {
+            return headerResponse.body();
+        } else {
+            throw new Exception("Wrong header response, code: " + headerResponse.code());
+        }
+    }
+
+    public String forgeOperations(TezosForgeBody tezosForgeBody) throws Exception { // TODO? not async
+        requestsCount++;
+        Log.i(TAG, "new forgeOperations request");
+
+        Response<String> forgeResponse = tezosApi.forgeOperations(tezosForgeBody).execute();
+
+        requestsCount--;
+        if (forgeResponse.code() == 200) {
+            return forgeResponse.body();
+        } else {
+            throw new Exception("Wrong forge response, code: " + forgeResponse.code());
+        }
+    }
+
+    public void peapplyOperations(TezosPreapplyBody tezosPreapplyBody) throws Exception {
+        Log.i(TAG, "new peapplyOperations request");
+
+        List<TezosPreapplyBody> tezosPreapplyBodyList = new ArrayList<>();
+        tezosPreapplyBodyList.add(tezosPreapplyBody);
+        Response<Void> preapplyResponse = tezosApi.preapplyOperations(tezosPreapplyBodyList).execute();
+
+        if (preapplyResponse.code() != 200) {
+            String error = "Preapply error: unknown error";
+            if (preapplyResponse.errorBody() != null) {
+                error = "Preapply error: " + preapplyResponse.errorBody().string();
+            }
+            Log.e(TAG, error);
+            throw new Exception(error);
+        }
+    }
+
+    public void injectOperations(String txForSend, SingleObserver<Object> injectObserver) {
+        requestsCount++;
+        Log.i(TAG, "new injectOperations request");
+
+        Single<Object> injectSingle = tezosApi.injectOperations(txForSend)
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .doOnEvent((object, throwable) -> requestsCount--);
+
+        injectSingle.subscribe(injectObserver);
+    }
+}

app/src/main/java/com/tangem/data/network/TezosApi.java

@@ -0,0 +1,35 @@
+package com.tangem.data.network;
+
+import com.tangem.data.network.model.TezosAccountResponse;
+import com.tangem.data.network.model.TezosForgeBody;
+import com.tangem.data.network.model.TezosHeaderResponse;
+import com.tangem.data.network.model.TezosPreapplyBody;
+
+import java.util.List;
+
+import io.reactivex.Single;
+import retrofit2.Call;
+import retrofit2.http.Body;
+import retrofit2.http.GET;
+import retrofit2.http.POST;
+import retrofit2.http.Path;
+
+public interface TezosApi {
+    @GET(ServerApiTezos.TEZOS_ADDRESS)
+    Single<TezosAccountResponse> getAccount(@Path("address") String address);
+
+    @GET(ServerApiTezos.TEZOS_HEADER)
+    Call<TezosHeaderResponse> getHeader();
+
+    @GET(ServerApiTezos.TEZOS_MANAGER_KEY)
+    Single<String> getManagerKey(@Path("address") String address);
+
+    @POST(ServerApiTezos.TEZOS_FORGE_OPERATIONS)
+    Call<String> forgeOperations(@Body TezosForgeBody tezosForgeBody);
+
+    @POST(ServerApiTezos.TEZOS_PREAPPLY_OPERATIONS)
+    Call<Void> preapplyOperations(@Body List<TezosPreapplyBody> tezosPreapplyBodyList);
+
+    @POST(ServerApiTezos.TEZOS_INJECT_OPERATIONS)
+    Single<Object> injectOperations(@Body String txForSend);
+}

app/src/main/java/com/tangem/data/network/model/TezosBody.kt

@@ -0,0 +1,25 @@
+package com.tangem.data.network.model
+
+data class TezosForgeBody(
+        val branch: String,
+        val contents: List<TezosOperationContent>
+)
+
+data class TezosOperationContent(
+        val kind: String,
+        val source: String,
+        val fee: String,
+        val counter: String,
+        val gas_limit: String,
+        val storage_limit: String,
+        val public_key: String? = null,
+        val destination: String? = null,
+        val amount: String? = null
+)
+
+data class TezosPreapplyBody(
+        val protocol: String,
+        val branch: String,
+        val contents: List<TezosOperationContent>,
+        val signature: String
+)

app/src/main/java/com/tangem/data/network/model/TezosResponse.kt

@@ -0,0 +1,19 @@
+package com.tangem.data.network.model
+
+import com.google.gson.annotations.SerializedName
+
+data class TezosAccountResponse(
+        @SerializedName("balance")
+        var balance: Long? = null,
+
+        @SerializedName("counter")
+        var counter: Long? = null
+)
+
+data class TezosHeaderResponse(
+        @SerializedName("protocol")
+        var protocol: String? = null,
+
+        @SerializedName("hash")
+        var hash: String? = null
+)

app/src/main/java/com/tangem/ui/fragment/MainFragment.kt

@@ -35,6 +35,9 @@ import com.tangem.tangem_card.tasks.ReadCardInfoTask
 import com.tangem.tangem_sdk.android.data.PINStorage
 import com.tangem.tangem_sdk.android.nfc.NfcDeviceAntennaLocation
 import com.tangem.tangem_sdk.android.reader.NfcReader
+import com.tangem.tangem_sdk.android.reader.NfcVReader
+import com.tangem.tangem_sdk.android.reader.ReadResult
+import com.tangem.tangem_sdk.android.reader.ReadSlixTagTask
 import com.tangem.tangem_sdk.data.EXTRA_TANGEM_CARD
 import com.tangem.tangem_sdk.data.EXTRA_TANGEM_CARD_UID
 import com.tangem.tangem_sdk.data.loadFromBundle
@@ -127,7 +130,7 @@ class MainFragment : BaseFragment(), NavigationResultListener, NfcAdapter.Reader
 
         tvBuyCards?.setText(spannable, TextView.BufferType.SPANNABLE)
         llShoppingView?.setOnClickListener {
-            val uri = Uri.parse ("https://www.tangemcards.com")
+            val uri = Uri.parse("https://www.tangemcards.com")
             val intent = Intent(Intent.ACTION_VIEW, uri)
             startActivity(intent)
         }
@@ -170,7 +173,7 @@ class MainFragment : BaseFragment(), NavigationResultListener, NfcAdapter.Reader
             return
         }
 
-        parseNfcvTag(tag)
+        NfcV.get(tag)?.let { onNfcVDiscovered(it, tag.id) }
 
         try {
             // get IsoDep handle and run cardReader thread
@@ -195,74 +198,41 @@ class MainFragment : BaseFragment(), NavigationResultListener, NfcAdapter.Reader
         }
     }
 
-    private fun parseNfcvTag(tag: Tag) {
-        if (NfcV.get(tag) != null) {
-            if (Ndef.get(tag) != null) {
-                try {
-                    onNdefDiscovered(Ndef.get(tag), tag.id)
-                } catch (e: Exception) {
-                    e.printStackTrace()
-                    (activity as MainActivity).nfcManager.notifyReadResult(false)
-                }
-                return
-            } else {
-                (activity as MainActivity).nfcManager.notifyReadResult(false)
-                return
-            }
-        }
-    }
 
-    private fun onNdefDiscovered(ndef: Ndef, uid: ByteArray) {
+    private fun onNfcVDiscovered(nfcV: NfcV, uid: ByteArray) {
         scope.launch {
+            when (val readResult = ReadSlixTagTask(NfcVReader(nfcV)).read()) {
+                is ReadResult.Failure -> (activity as MainActivity).nfcManager.notifyReadResult(false)
+                is ReadResult.Success -> {
+                    try {
+                        val tlvs = readResult.tlvs
+                        val cardDataTlv = TLVList.fromBytes((tlvs.getTLV(TLV.Tag.TAG_CardData)).Value)
+                        Log.v(TAG, "\n" + tlvs.getParsedTLVs(""))
+                        val card = TangemCard(uid.toString())
+                        card.batch = cardDataTlv.getTLV(TLV.Tag.TAG_Batch).asHexString
+                        card.setIssuer(cardDataTlv.getTLV(TLV.Tag.TAG_Issuer_ID).Value.toString(), null)
+                        card.blockchainID = Blockchain.StellarTag.id
+                        card.walletPublicKey = tlvs.getTLV(TLV.Tag.TAG_Wallet_PublicKey).Value
+                        card.status = TangemCard.Status.Loaded
+                        card.tagSignature = tlvs.getTLV(TLV.Tag.TAG_Signature).Value
 
+                        val ctx = TangemContext(card)
+                        val engineCoin = XlmTagEngine(ctx)
+                        engineCoin.defineWallet()
+                        launch(Dispatchers.Main) {
 
-            try {
-                ndef.connect()
-                val records = ndef.ndefMessage.records
-                for (record in records) {
-                    if (record.toUri() != null) {
-                        when (record.toUri().toString()) {
-                            "vnd.android.nfc://ext/tangem.com:wallet" -> {
-                                //mConsole.write(Util.bytesToHex(record.getPayload()), MessageAdapter.MSG_OKAY, "", null, false);
-                                val payload = record.payload
-                                Log.v(TAG, "tangem.com:wallet[${payload.size} bytes]:")
-                                try {
-                                    val tlvNDEF: TLVList = TLVList.fromBytes(Arrays.copyOfRange(payload, 2, payload.size))
-                                    val cardDataTlv = TLVList.fromBytes((tlvNDEF.getTLV(TLV.Tag.TAG_CardData)).Value)
-                                    Log.v(TAG, "\n" + tlvNDEF.getParsedTLVs(""))
-                                    val card = TangemCard(uid.toString())
-                                    card.batch = cardDataTlv.getTLV(TLV.Tag.TAG_Batch).asHexString
-                                    card.setIssuer(cardDataTlv.getTLV(TLV.Tag.TAG_Issuer_ID).Value.toString(), null)
-                                    card.blockchainID =  Blockchain.StellarTag.id
-                                    card.walletPublicKey = tlvNDEF.getTLV(TLV.Tag.TAG_Wallet_PublicKey).Value
-                                    card.status = TangemCard.Status.Loaded
-                                    card.tagSignature = tlvNDEF.getTLV(TLV.Tag.TAG_Signature).Value
-
-                                    val ctx = TangemContext(card)
-                                    val engineCoin = XlmTagEngine(ctx)
-                                    engineCoin.defineWallet()
-                                    launch(Dispatchers.Main) {
-
-                                        val bundle = Bundle()
-                                        bundle.putParcelable(Constant.EXTRA_LAST_DISCOVERED_TAG, lastTag)
-                                        ctx.saveToBundle(bundle)
-                                        navigateForResult(Constant.REQUEST_CODE_SHOW_CARD_ACTIVITY,
-                                                R.id.action_main_to_tagFragment, bundle)
-                                    }
-                                } catch (e: TLVException) {
-                                    e.printStackTrace()
-                                    Log.v(TAG, e.message)
-                                }
-                            }
-                            else -> Log.v(TAG, record.toUri().toString())
+                            val bundle = Bundle()
+                            bundle.putParcelable(Constant.EXTRA_LAST_DISCOVERED_TAG, lastTag)
+                            ctx.saveToBundle(bundle)
+                            navigateForResult(Constant.REQUEST_CODE_SHOW_CARD_ACTIVITY,
+                                    R.id.action_main_to_tagFragment, bundle)
                         }
+                    } catch (e: TLVException) {
+                        e.printStackTrace()
+                        Log.v(TAG, e.message)
                     }
                 }
-            } catch (e: Exception) {
-                e.printStackTrace()
-                (activity as MainActivity).nfcManager.notifyReadResult(false)
             }
-
         }
     }
 
@@ -316,8 +286,13 @@ class MainFragment : BaseFragment(), NavigationResultListener, NfcAdapter.Reader
                             }
                         }
                         card.status == TangemCard.Status.Empty -> {
-                            val bundle = Bundle().apply { ctx.saveToBundle(this) }
-                            navigateToDestination(R.id.action_main_to_emptyWalletFragment, bundle)
+                            val engineCoin = CoinEngineFactory.create(ctx)
+                            if (engineCoin != null) {
+                                val bundle = Bundle().apply { ctx.saveToBundle(this) }
+                                navigateToDestination(R.id.action_main_to_emptyWalletFragment, bundle)
+                            } else {
+                                showUnkownBlockchainWarning()
+                            }
                         }
                         card.status == TangemCard.Status.Purged -> Toast.makeText(context, R.string.main_screen_erased_wallet, Toast.LENGTH_SHORT).show()
                         card.status == TangemCard.Status.NotPersonalized -> Toast.makeText(context, R.string.main_screen_not_personalized, Toast.LENGTH_SHORT).show()

app/src/main/java/com/tangem/wallet/CoinEngineFactory.kt

@@ -16,6 +16,7 @@ import com.tangem.wallet.nftToken.NftTokenEngine
 import com.tangem.wallet.rsk.RskEngine
 import com.tangem.wallet.rsk.RskTokenEngine
 import com.tangem.wallet.token.TokenEngine
+import com.tangem.wallet.tezos.TezosEngine
 import com.tangem.wallet.xlm.XlmAssetEngine
 import com.tangem.wallet.xlm.XlmEngine
 import com.tangem.wallet.xlmtag.XlmTagEngine
@@ -52,6 +53,7 @@ object CoinEngineFactory {
             Blockchain.StellarTag -> XlmTagEngine()
             Blockchain.Eos -> EosEngine()
             Blockchain.Ducatus -> DucatusEngine()
+            Blockchain.Tezos -> TezosEngine()
             else -> null
         }
     }
@@ -93,6 +95,8 @@ object CoinEngineFactory {
                 EosEngine(context)
             else if (Blockchain.Ducatus == context.blockchain)
                 DucatusEngine(context)
+            else if (Blockchain.Tezos == context.blockchain)
+                TezosEngine(context)
             else
                 return null
         } catch (e: Exception) {

app/src/main/java/com/tangem/wallet/cardano/CardanoEngine.java

@@ -503,7 +503,7 @@ public class CardanoEngine extends CoinEngine {
 
             @Override
             public boolean isSigningMethodSupported(TangemCard.SigningMethod signingMethod) {
-                return signingMethod == TangemCard.SigningMethod.Sign_Hash || signingMethod == TangemCard.SigningMethod.Sign_Raw;
+                return signingMethod == TangemCard.SigningMethod.Sign_Hash;
             }
 
             @Override

app/src/main/java/com/tangem/wallet/tezos/TezosData.kt

@@ -0,0 +1,49 @@
+package com.tangem.wallet.tezos
+
+import android.os.Bundle
+import android.util.Log
+import com.tangem.wallet.CoinData
+import java.lang.Exception
+
+class TezosData : CoinData() {
+    var balance: Long? = null
+    var counter: Long? = null
+    var publicKeyReavealed: Boolean? = null
+    var tezosPublicKey: String? = null
+
+    override fun clearInfo() {
+        super.clearInfo()
+        balance = null
+        counter = null
+        publicKeyReavealed = null
+        tezosPublicKey = null
+    }
+
+    override fun loadFromBundle(B: Bundle) {
+        super.loadFromBundle(B)
+
+        if (B.containsKey("Balance")) balance = B.getLong("Balance")
+
+        if (B.containsKey("Counter")) counter = B.getLong("Counter")
+
+        if (B.containsKey("PublicKeyReavealed")) publicKeyReavealed = B.getBoolean("PublicKeyReavealed")
+
+        if (B.containsKey("TezosPublicKey")) tezosPublicKey = B.getString("TezosPublicKey")
+    }
+
+    override fun saveToBundle(B: Bundle) {
+        super.saveToBundle(B)
+        try {
+            if (balance != null) B.putLong("Balance", balance!!)
+
+            if (counter != null) B.putLong("Counter", counter!!)
+
+            if (publicKeyReavealed != null) B.putBoolean("PublicKeyReavealed", publicKeyReavealed!!)
+
+            if (tezosPublicKey != null) B.putString("TezosPublicKey", tezosPublicKey!!)
+
+        } catch (e: Exception) {
+            Log.e("Can't save to bundle ", e.message)
+        }
+    }
+}

app/src/main/java/com/tangem/wallet/tezos/TezosEngine.kt

@@ -0,0 +1,507 @@
+package com.tangem.wallet.tezos
+
+import android.net.Uri
+import android.os.StrictMode
+import android.text.InputFilter
+import android.util.Log
+import com.tangem.App
+import com.tangem.data.network.ServerApiTezos
+import com.tangem.data.network.model.TezosAccountResponse
+import com.tangem.data.network.model.TezosForgeBody
+import com.tangem.data.network.model.TezosOperationContent
+import com.tangem.data.network.model.TezosPreapplyBody
+import com.tangem.tangem_card.data.TangemCard
+import com.tangem.tangem_card.tasks.SignTask
+import com.tangem.tangem_card.util.Util
+import com.tangem.util.CryptoUtil
+import com.tangem.util.DecimalDigitsInputFilter
+import com.tangem.wallet.*
+import io.reactivex.observers.DisposableSingleObserver
+import org.spongycastle.jcajce.provider.digest.Blake2b
+import java.math.BigDecimal
+
+class TezosEngine : CoinEngine {
+    constructor()
+
+    constructor(context: TangemContext) : super(context) {
+        if (context.coinData == null) {
+            coinData = TezosData()
+            context.coinData = coinData
+        } else if (context.coinData is TezosData) {
+            coinData = context.coinData as TezosData
+        } else {
+            throw Exception("Invalid type of Blockchain data for XlmEngine")
+        }
+    }
+
+    private val TAG = TezosEngine::class.java.simpleName
+
+    var coinData: TezosData? = null
+
+    private fun getDecimals() = 6
+
+    @Throws(Exception::class)
+    private fun checkBlockchainDataExists() {
+        if (coinData == null) throw Exception("No blockchain data")
+    }
+
+    override fun awaitingConfirmation(): Boolean {
+        return App.pendingTransactionsStorage.hasTransactions(ctx.card)
+    }
+
+    override fun getBalanceHTML(): String? {
+        val balance = balance
+        return if (balance != null) {
+            balance.toDescriptionString(getDecimals())
+        } else {
+            ""
+        }
+    }
+
+    override fun getBalanceCurrency(): String? {
+        return "XTZ"
+    }
+
+    override fun isBalanceNotZero(): Boolean {
+        if (coinData == null) return false
+        return if (balance == null) false else balance!!.notZero()
+    }
+
+    override fun hasBalanceInfo(): Boolean {
+        return if (coinData == null) false else coinData!!.balance != null
+    }
+
+    override fun isExtractPossible(): Boolean {
+        if (!hasBalanceInfo()) {
+            ctx.setMessage(R.string.loaded_wallet_error_obtaining_blockchain_data)
+        } else if (!isBalanceNotZero) {
+            ctx.setMessage(R.string.general_wallet_empty)
+        } else if (awaitingConfirmation()) {
+            ctx.setMessage(R.string.loaded_wallet_message_wait)
+        } else {
+            return true
+        }
+        return false
+    }
+
+    override fun getFeeCurrency(): String? {
+        return "XTZ"
+    }
+
+    override fun validateAddress(address: String?): Boolean {
+        val prefixedHashWithChecksum = Base58.decodeBase58(address)
+
+        if (prefixedHashWithChecksum == null || prefixedHashWithChecksum.size != 27) return false
+
+        val prefixedHash = prefixedHashWithChecksum.copyOf(23)
+        val checksum = prefixedHashWithChecksum.copyOfRange(23, 27)
+
+        val calcChecksum = CryptoUtil.doubleSha256(prefixedHash).copyOfRange(0, 4)
+
+        return calcChecksum.contentEquals(checksum)
+    }
+
+    override fun isNeedCheckNode(): Boolean {
+        return false
+    }
+
+    override fun getWalletExplorerUri(): Uri? {
+        return Uri.parse("https://tezblock.io/account/" + ctx.coinData.wallet)
+    }
+
+    override fun getShareWalletUri(): Uri? {
+        return Uri.parse(ctx.coinData.wallet)
+    }
+
+    override fun getAmountInputFilters(): Array<InputFilter>? {
+        return arrayOf(DecimalDigitsInputFilter(getDecimals()))
+    }
+
+    override fun checkNewTransactionAmount(amount: Amount): Boolean {
+        if (coinData == null) return false
+        return amount <= balance
+    }
+
+    override fun checkNewTransactionAmountAndFee(amountValue: Amount?,
+                                                 feeValue: Amount?,
+                                                 isIncludeFee: Boolean
+    ): Boolean {
+        try {
+            checkBlockchainDataExists()
+        } catch (e: java.lang.Exception) {
+            e.printStackTrace()
+            return false
+        }
+        if (feeValue == null || amountValue == null) return false
+        if (feeValue.isZero || amountValue.isZero) return false
+        if (isIncludeFee && (amountValue > balance || amountValue < feeValue)) return false
+        if (!isIncludeFee && amountValue.add(feeValue) > balance) return false
+
+        return true
+    }
+
+    override fun validateBalance(balanceValidator: BalanceValidator): Boolean {
+        try {
+            if (ctx.card.offlineBalance == null &&
+                    !ctx.coinData.isBalanceReceived ||
+                    !ctx.coinData.isBalanceReceived &&
+                    ctx.card.remainingSignatures != ctx.card.maxSignatures
+            ) {
+                balanceValidator.setScore(0)
+                balanceValidator.firstLine = R.string.balance_validator_first_line_unknown_balance
+                balanceValidator.setSecondLine(R.string.balance_validator_second_line_unverified_balance)
+                return false
+            }
+            if (coinData!!.isBalanceReceived) {
+                balanceValidator.setScore(100)
+                balanceValidator.firstLine = R.string.balance_validator_first_line_verified_balance
+                balanceValidator.setSecondLine(R.string.balance_validator_second_line_confirmed_in_blockchain)
+                if (balance!!.isZero) {
+                    balanceValidator.firstLine = R.string.balance_validator_first_line_empty_wallet
+                    balanceValidator.setSecondLine(R.string.empty_string)
+                }
+            }
+            if (ctx.card.offlineBalance != null &&
+                    !coinData!!.isBalanceReceived &&
+                    ctx.card.remainingSignatures ==
+                    ctx.card.maxSignatures &&
+                    balance!!.notZero()
+            ) {
+                balanceValidator.setScore(80)
+                balanceValidator.firstLine = R.string.balance_validator_first_line_verified_offline
+                balanceValidator.setSecondLine(
+                        R.string.balance_validator_second_line_internet_to_get_balance
+                )
+            }
+            return true
+        } catch (e: java.lang.Exception) {
+            e.printStackTrace()
+            return false
+        }
+    }
+
+    override fun getBalance(): Amount? {
+        var balanceAmount: Amount? = null
+
+        if (hasBalanceInfo()) {
+            val xtzBalance = BigDecimal
+                    .valueOf(coinData!!.balance!!).movePointLeft(getDecimals())
+            balanceAmount = Amount(xtzBalance, balanceCurrency)
+        }
+
+        return balanceAmount
+    }
+
+    override fun evaluateFeeEquivalent(fee: String?): String? {
+        return if (!coinData!!.amountEquivalentDescriptionAvailable) "" else try {
+            val feeAmount = Amount(fee, feeCurrency)
+            feeAmount.toEquivalentString(coinData!!.rate.toDouble())
+        } catch (e: java.lang.Exception) {
+            ""
+        }
+    }
+
+    override fun getBalanceEquivalent(): String? {
+        if (coinData == null || !coinData!!.amountEquivalentDescriptionAvailable) return ""
+        val balance = balance ?: return ""
+        return balance.toEquivalentString(coinData!!.rate.toDouble())
+    }
+
+    override fun calculateAddress(pkUncompressed: ByteArray): String? {
+        val publicKeyHash = Blake2b.Blake2b160().digest(pkUncompressed)
+
+        val tz1Prefix = Util.hexToBytes("06A19F")
+        val prefixedHash = tz1Prefix + publicKeyHash
+
+        val checksum = CryptoUtil.doubleSha256(prefixedHash).copyOfRange(0, 4)
+        val prefixedHashWithChecksum = prefixedHash + checksum
+
+        return Base58.encodeBase58(prefixedHashWithChecksum)
+    }
+
+    fun calculateTezosPublicKey(pkUncompressed: ByteArray): String {
+        val edpkPrefix = Util.hexToBytes("0D0F25D9")
+        val prefixedPubKey = edpkPrefix + pkUncompressed
+
+        val checksum = CryptoUtil.doubleSha256(prefixedPubKey).copyOfRange(0, 4)
+        val prefixedHashWithChecksum = prefixedPubKey + checksum
+
+        return Base58.encodeBase58(prefixedHashWithChecksum)
+    }
+
+    override fun convertToAmount(internalAmount: InternalAmount): Amount {
+        return Amount(internalAmount.movePointLeft(getDecimals()), balanceCurrency)
+    }
+
+    override fun convertToAmount(strAmount: String, currency: String): Amount {
+        return Amount(strAmount, currency)
+    }
+
+    override fun convertToInternalAmount(amount: Amount): InternalAmount {
+        return InternalAmount(amount.movePointRight(getDecimals()), "mutez")
+    }
+
+    override fun convertToInternalAmount(bytes: ByteArray?): InternalAmount? {
+        if (bytes == null) return null
+        val reversed = ByteArray(bytes.size)
+        for (i in bytes.indices) reversed[i] = bytes[bytes.size - i - 1]
+        return InternalAmount(Util.byteArrayToLong(reversed), "mutez")
+    }
+
+    override fun convertToByteArray(internalAmount: InternalAmount): ByteArray? {
+        val bytes = Util.longToByteArray(internalAmount.longValueExact())
+        val reversed = ByteArray(bytes.size)
+        for (i in bytes.indices) reversed[i] = bytes[bytes.size - i - 1]
+        return reversed
+    }
+
+    override fun createCoinData(): CoinData {
+        return TezosData()
+    }
+
+    override fun getUnspentInputsDescription() = ""
+
+    override fun constructTransaction(
+            amountValue: Amount,
+            feeValue: Amount,
+            IncFee: Boolean,
+            targetAddress: String
+    ): SignTask.TransactionToSign {
+
+        checkBlockchainDataExists()
+        val policy = StrictMode.ThreadPolicy.Builder().permitAll().build()
+        StrictMode.setThreadPolicy(policy)
+
+        val finalAmount = if (IncFee) {
+            amountValue.minus(feeValue)
+        } else {
+            amountValue
+        }
+
+        val serverApiTezos = ServerApiTezos()
+        val headerResponse = serverApiTezos.header
+
+        val contents = arrayListOf<TezosOperationContent>()
+
+        var counter = coinData!!.counter!!
+
+        if (!coinData!!.publicKeyReavealed!!) {
+            counter++
+            val revealOp = TezosOperationContent(
+                    kind = "reveal",
+                    source = coinData!!.wallet,
+                    fee = "1300",
+                    counter = counter.toString(),
+                    gas_limit = "10000",
+                    storage_limit = "0",
+                    public_key = coinData!!.tezosPublicKey!!
+            )
+
+            contents.add(revealOp)
+        }
+
+        counter++
+        val transactionOp = TezosOperationContent(
+                kind = "transaction",
+                source = coinData!!.wallet,
+                fee = "1350",
+                counter = counter.toString(),
+                gas_limit = "10600",
+                storage_limit = "277",
+                destination = targetAddress,
+                amount = finalAmount.movePointRight(getDecimals()).toBigInteger().toString()
+        )
+
+        contents.add(transactionOp)
+
+        val tezosForgeBody = TezosForgeBody(headerResponse.hash!!, contents)
+        val forgeResponse = serverApiTezos.forgeOperations(tezosForgeBody)
+        val watermark = "03"
+        val forgedBytes = Util.hexToBytes(watermark + forgeResponse)
+
+        return object : SignTask.TransactionToSign {
+            override fun isSigningMethodSupported(signingMethod: TangemCard.SigningMethod): Boolean {
+                return signingMethod == TangemCard.SigningMethod.Sign_Hash
+            }
+
+            @Throws(java.lang.Exception::class)
+            override fun getHashesToSign(): Array<ByteArray?> {
+                val dataForSign = arrayOfNulls<ByteArray>(1)
+                dataForSign[0] = Blake2b.Blake2b256().digest(forgedBytes)
+                return dataForSign
+            }
+
+            @Throws(java.lang.Exception::class)
+            override fun getRawDataToSign(): ByteArray? {
+                throw java.lang.Exception("Signing of raw transaction not supported for " + this.javaClass.simpleName)
+            }
+
+            @Throws(java.lang.Exception::class)
+            override fun getHashAlgToSign(): String? {
+                throw java.lang.Exception("Signing of raw transaction not supported for " + this.javaClass.simpleName)
+            }
+
+            @Throws(java.lang.Exception::class)
+            override fun getIssuerTransactionSignature(dataToSignByIssuer: ByteArray?): ByteArray? {
+                throw java.lang.Exception("Transaction validation by issuer not supported in this version")
+            }
+
+            @Throws(java.lang.Exception::class)
+            override fun onSignCompleted(signFromCard: ByteArray): ByteArray? {
+                val edsigPrefix = Util.hexToBytes("09F5CD8612")
+                val prefixedSignature = edsigPrefix + signFromCard
+                val checksum = CryptoUtil.doubleSha256(prefixedSignature).copyOfRange(0, 4)
+                val prefixedSignatureWithChecksum = prefixedSignature + checksum
+
+                val preapplyBody = TezosPreapplyBody(
+                        protocol = headerResponse.protocol!!,
+                        branch = headerResponse.hash!!,
+                        contents = contents,
+                        signature = Base58.encodeBase58(prefixedSignatureWithChecksum)
+                )
+
+                try {
+                    serverApiTezos.peapplyOperations(preapplyBody)
+                } catch (e: java.lang.Exception) {
+                    ctx.error = e.message
+                    return null
+                }
+
+                val txForSend = Util.hexToBytes(forgeResponse) + signFromCard
+                notifyOnNeedSendTransaction(txForSend)
+                return txForSend
+            }
+        }
+    }
+
+    override fun requestBalanceAndUnspentTransactions(
+            blockchainRequestsCallbacks: BlockchainRequestsCallbacks
+    ) {
+        coinData!!.tezosPublicKey = calculateTezosPublicKey(ctx.card.walletPublicKey)
+
+        val serverApiTezos = ServerApiTezos()
+
+        val accountObserver = object : DisposableSingleObserver<TezosAccountResponse>() {
+            override fun onSuccess(response: TezosAccountResponse) {
+                coinData!!.balance = response.balance
+                coinData!!.isBalanceReceived = true
+                coinData!!.counter = response.counter
+
+                if (serverApiTezos.isRequestsSequenceCompleted) {
+                    blockchainRequestsCallbacks.onComplete(ctx.hasError())
+                } else {
+                    blockchainRequestsCallbacks.onProgress()
+                }
+            }
+
+            override fun onError(e: Throwable) {
+                Log.e(TAG, "requestBalanceAndUnspentTransactions error " + e.message)
+                ctx.error = e.message
+                e.printStackTrace()
+
+                if (serverApiTezos.isRequestsSequenceCompleted) {
+                    blockchainRequestsCallbacks.onComplete(false)
+                } else {
+                    blockchainRequestsCallbacks.onProgress()
+                }
+            }
+        }
+
+        val managerKeyObserver = object : DisposableSingleObserver<String>() {
+            override fun onSuccess(response: String) {
+                coinData!!.publicKeyReavealed = true
+
+                if (serverApiTezos.isRequestsSequenceCompleted) {
+                    blockchainRequestsCallbacks.onComplete(ctx.hasError())
+                } else {
+                    blockchainRequestsCallbacks.onProgress()
+                }
+            }
+
+            override fun onError(e: Throwable) {
+                Log.e(TAG, "requestFee error " + e.message)
+                e.printStackTrace()
+
+                coinData!!.publicKeyReavealed = false // error expected when key is not revealed
+
+                if (serverApiTezos.isRequestsSequenceCompleted) {
+                    blockchainRequestsCallbacks.onComplete(ctx.hasError())
+                } else {
+                    blockchainRequestsCallbacks.onProgress()
+                }
+            }
+        }
+
+        serverApiTezos.getAddress(coinData!!.wallet, accountObserver)
+        serverApiTezos.getMangerKey(coinData!!.wallet, managerKeyObserver)
+
+    }
+
+    override fun requestFee(
+            blockchainRequestsCallbacks: BlockchainRequestsCallbacks,
+            targetAddress: String?,
+            amount: Amount?
+    ) {
+        var fee: BigDecimal = BigDecimal.valueOf(0.00135)
+
+        if (!coinData!!.publicKeyReavealed!!) {
+            fee += BigDecimal.valueOf(0.0013)
+        }
+
+        val serverApiTezos = ServerApiTezos()
+
+        val accountObserver = object : DisposableSingleObserver<TezosAccountResponse>() {
+            override fun onSuccess(response: TezosAccountResponse) {
+                if (response.balance == 0L) {
+                    fee += BigDecimal.valueOf(0.257)
+                }
+                val feeAmount = Amount(fee, feeCurrency)
+                coinData!!.minFee = feeAmount
+                coinData!!.normalFee = feeAmount
+                coinData!!.maxFee = feeAmount
+
+                blockchainRequestsCallbacks.onComplete(true)
+            }
+
+            override fun onError(e: Throwable) {
+                Log.e(TAG, "requestFee error " + e.message)
+                ctx.error = e.message
+                e.printStackTrace()
+
+                blockchainRequestsCallbacks.onComplete(false)
+            }
+        }
+
+        serverApiTezos.getAddress(targetAddress, accountObserver)
+    }
+
+    override fun requestSendTransaction(
+            blockchainRequestsCallbacks: BlockchainRequestsCallbacks,
+            txForSend: ByteArray?
+    ) {
+
+        if (txForSend == null) {
+            blockchainRequestsCallbacks.onComplete(false)
+        } else {
+            val injectObserver = object : DisposableSingleObserver<Any>() {
+                override fun onSuccess(response: Any) {
+                    blockchainRequestsCallbacks.onComplete(true)
+                }
+
+                override fun onError(e: Throwable) {
+                    blockchainRequestsCallbacks.onComplete(false)
+                }
+            }
+
+            ServerApiTezos().injectOperations(Util.bytesToHex(txForSend), injectObserver)
+        }
+    }
+
+    override fun allowSelectFeeLevel(): Boolean {
+        return false
+    }
+
+    override fun pendingTransactionTimeoutInSeconds(): Int {
+        return 60
+    }
+}

build.gradle

@@ -6,7 +6,7 @@ buildscript {
         maven { url 'https://maven.fabric.io/public' }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.2'
+        classpath 'com.android.tools.build:gradle:3.5.3'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
         classpath 'io.fabric.tools:gradle:1.31.0'

tangem-card-old/src/main/java/com/tangem/tangem_card/reader/NfcReader.java

@@ -17,4 +17,5 @@ public interface NfcReader {
 
     void connect();
 
+    boolean isConnected();
 }

tangem-card-old/src/main/java/com/tangem/tangem_card/reader/TLVList.java

@@ -69,4 +69,20 @@ public class TLVList extends ArrayList<TLV> {
         while (tlv != null);
         return tlvList;
     }
+
+    public static TLVList tryFromBytes(byte[] mData) {
+        TLVList tlvList = new TLVList();
+        ByteArrayInputStream stream = new ByteArrayInputStream(mData);
+        TLV tlv = null;
+        do {
+            try {
+                tlv = TLV.ReadFromStream(stream);
+                if (tlv != null) tlvList.add(tlv);
+            } catch (IOException e) {
+                break;
+            }
+        }
+        while (tlv != null);
+        return tlvList;
+    }
 }

tangem-sdk-old/src/main/java/com/tangem/tangem_sdk/android/reader/NfcManager.kt

@@ -25,7 +25,7 @@ class NfcManager(private val activity: FragmentActivity, private val readerCallb
 
         // reader mode flags: listen for type A (not B), skipping ndef check
         private const val READER_FLAGS = NfcAdapter.FLAG_READER_NFC_A or NfcAdapter.FLAG_READER_NFC_V or
-                NfcAdapter.FLAG_READER_NO_PLATFORM_SOUNDS
+                NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK or NfcAdapter.FLAG_READER_NO_PLATFORM_SOUNDS
         private const val DELAY_PRESENCE = 1500
 
         private const val REQUEST_NFC_PERMISSIONS = 1

tangem-sdk-old/src/main/java/com/tangem/tangem_sdk/android/reader/NfcReader.kt

@@ -38,4 +38,8 @@ data class NfcReader(
         isoDep.timeout = timeout
     }
 
+    override fun isConnected(): Boolean {
+        return isoDep.isConnected
+    }
+
 }

tangem-sdk-old/src/main/java/com/tangem/tangem_sdk/android/reader/NfcVReader.kt

@@ -0,0 +1,39 @@
+package com.tangem.tangem_sdk.android.reader
+
+import android.nfc.tech.NfcV
+
+data class NfcVReader(
+        var nfcV: NfcV?
+) : com.tangem.tangem_card.reader.NfcReader {
+
+    override fun getId(): ByteArray? {
+        return nfcV?.tag?.id
+    }
+
+    override fun setTimeout(timeout: Int) {
+    }
+
+    override fun getTimeout(): Int {
+        return 0
+    }
+
+    override fun transceive(data: ByteArray?): ByteArray? {
+        return nfcV?.transceive(data)
+    }
+
+    override fun ignoreTag() {
+        nfcV?.close()
+        nfcV = null
+    }
+
+    override fun notifyReadResult(success: Boolean) {
+    }
+
+    override fun connect() {
+        nfcV?.connect()
+    }
+
+    override fun isConnected(): Boolean {
+        return nfcV?.isConnected == true
+    }
+}

tangem-sdk-old/src/main/java/com/tangem/tangem_sdk/android/reader/ReadSlixTagTask.kt

@@ -0,0 +1,120 @@
+package com.tangem.tangem_sdk.android.reader
+
+import android.nfc.NdefMessage
+import android.nfc.NdefRecord
+import com.tangem.tangem_card.reader.NfcReader
+import com.tangem.tangem_card.reader.TLV
+import com.tangem.tangem_card.reader.TLVList
+import com.tangem.tangem_card.util.Util
+import java.io.ByteArrayOutputStream
+import java.io.IOException
+import java.util.*
+
+class ReadSlixTagTask(val nfcReader: NfcReader) {
+
+    private var lastErrorCode: Int = 0
+
+    fun read(): ReadResult {
+        if (!nfcReader.isConnected) {
+            try {
+                nfcReader.connect()
+            } catch (e: Exception) {
+                return ReadResult.Failure(e)
+            }
+        }
+        return try {
+            runRead()
+        } catch (e: Exception) {
+            nfcReader.ignoreTag()
+            ReadResult.Failure(e)
+        }
+    }
+
+    private fun runRead(): ReadResult {
+        val ndefMessage = runReadNDEF()
+        val records: Array<NdefRecord> = ndefMessage.records
+        for (record in records) {
+            if (record.toUri() != null && record.toUri().toString() == "vnd.android.nfc://ext/tangem.com:wallet") {
+                val payload = record.payload
+                val tlvNDEF = TLVList.fromBytes(Arrays.copyOfRange(payload, 2, payload.size))
+                nfcReader.ignoreTag()
+                return ReadResult.Success(tlvNDEF)
+            }
+        }
+        return ReadResult.Failure(Exception("No parcelable Tlv has been found."))
+    }
+
+    private fun runReadNDEF(): NdefMessage {
+        val answerCC = readSingleBlock(0x00)
+
+        if (answerCC.size != 4 || answerCC[0].toInt() != 0xE1 || ((answerCC[1].toInt() and 0xF0) != 0x40)) {
+
+        } else {
+            throw Exception("Failed! Invalid CC read " + Util.bytesToHex(answerCC))
+        }
+        if ((answerCC[3].toInt() and 0x01) != 0x01) {
+            throw Exception("Multiple block read unsupported!")
+        }
+        val areaSize = 8 * answerCC[2]
+        val blocksCount = areaSize / 4
+
+        val areaBuf = readMultipleBlocks(1, blocksCount)
+
+        val tlvNDEF = TLVList.tryFromBytes(areaBuf)
+
+        return NdefMessage(tlvNDEF.getTLV(TLV.Tag.TAG_CardPublicKey).Value)
+    }
+
+    private fun readSingleBlock(blockNo: Int): ByteArray {
+        return doTransceive(0x20, blockNo)!!
+    }
+
+    private fun readMultipleBlocks(startBlock: Int, blocksCount: Int): ByteArray {
+        val resultBuf = ByteArrayOutputStream()
+        val maxBlocksAtOnce = 32
+        var blocksRemaining = blocksCount
+        var firstBlockToRead = startBlock
+        while (blocksRemaining > 0) {
+            val blocksToRead = if (blocksRemaining > maxBlocksAtOnce) {
+                maxBlocksAtOnce
+            } else {
+                blocksRemaining
+            }
+            val blocks = doTransceive(0x23.toByte(), firstBlockToRead, blocksToRead - 1)
+            blocksRemaining -= blocksToRead
+            firstBlockToRead += blocksToRead
+            resultBuf.write(blocks!!)
+        }
+        return resultBuf.toByteArray()
+    }
+
+    private fun doTransceive(cmd: Byte, p1: Int?, p2: Int? = null, params: ByteArray? = null): ByteArray? {
+        val command: ByteArray
+        val res: ByteArray?
+        lastErrorCode = -1
+        val os = ByteArrayOutputStream()
+        os.write(REQ_FLAG.toInt())
+        os.write(cmd.toInt())
+        p1?.let { os.write(p1) }
+        p2?.let { os.write(it) }
+        params?.let { os.write(params, 0, params.size) }
+        command = os.toByteArray()
+        if (!nfcReader.isConnected) throw IOException("Connection  lost")
+        res = nfcReader.transceive(command)
+        lastErrorCode = res[0].toInt()
+        if (lastErrorCode != 0) {
+            throw IOException("Error! Code: " + String.format("0x%02x", lastErrorCode))
+        }
+        return res.copyOfRange(1, res.size)
+    }
+
+    companion object{
+        // iso15693 flags
+        private const val REQ_FLAG: Byte = 0x02
+    }
+}
+
+sealed class ReadResult {
+    data class Success(val tlvs: TLVList) : ReadResult()
+    data class Failure(val exception: Exception) : ReadResult()
+}