Updated on 2026-08-14

blockchain/.gitignore

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+/build

blockchain/build.gradle

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+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+android {
+    compileSdkVersion 29
+    buildToolsVersion "29.0.0"
+
+
+    defaultConfig {
+        minSdkVersion 21
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles 'consumer-rules.pro'
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation project(':tangem-core')
+    implementation project(':tangem-sdk')
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.core:core-ktx:1.1.0'
+
+    implementation 'com.squareup.retrofit2:retrofit:2.6.0'
+    implementation 'com.squareup.retrofit2:converter-moshi:2.6.0'
+    implementation 'com.squareup.moshi:moshi:1.9.2'
+
+    implementation 'org.bitcoinj:bitcoinj-core:0.15.2'
+
+
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.5.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+}

blockchain/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

blockchain/src/main/AndroidManifest.xml

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+<manifest package="com.tangem.blockchain" />

blockchain/src/main/java/com/tangem/blockchain/common/Blockchain.kt

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+package com.tangem.blockchain.common
+
+import com.tangem.blockchain.bitcoin.BitcoinAddressFactory
+import com.tangem.blockchain.bitcoin.BitcoinAddressValidator
+import java.math.BigDecimal
+
+enum class Blockchain(
+        val id: String,
+        val currency: String,
+        val decimals: Byte,
+        val fullName: String,
+        val pendingTransactionTimeout: Int) {
+    Unknown("", "", 0, "", 0),
+    Bitcoin("", "", 8, "", 0),
+    BitcoinTestnet("", "", 8, "", 0),
+    Ethereum("", "", 18, "", 0),
+    Rootstock("", "", 18, "", 0),
+    Cardano("", "", 6, "", 0),
+    Ripple("", "", 6, "", 0),
+    Binance("", "", 8, "", 0),
+    Stellar("", "", 7, "", 0);
+
+    fun roundingMode(): Int = when (this) {
+        Bitcoin, Ethereum, Rootstock, Binance -> BigDecimal.ROUND_DOWN
+        Cardano -> BigDecimal.ROUND_UP
+        else -> BigDecimal.ROUND_HALF_UP
+    }
+
+    fun makeAddress(cardPublicKey: ByteArray): String {
+        return when (this) {
+            Unknown -> throw Exception("unsupported blockchain")
+            Bitcoin -> BitcoinAddressFactory.makeAddress(cardPublicKey)
+            BitcoinTestnet -> BitcoinAddressFactory.makeAddress(cardPublicKey, testNet = true)
+//            Ethereum -> EthereumAddressFactory.makeAddress(cardPublicKey)
+//            Rootstock -> RootstockAddressFactory.makeAddress(cardPublicKey)
+//            Cardano -> CardanoAddressFactory.makeAddress(cardPublicKey)
+//            Ripple -> RippleAddressFactory.makeAddress(cardPublicKey)
+//            Binance -> BinanceAddressFactory.makeAddress(cardPublicKey)
+//            Stellar -> StellarAddressFactory.makeAddress(cardPublicKey)
+        }
+    }
+
+    fun validateAddress(address: String): Boolean {
+        return when (this) {
+            Unknown -> throw Exception("unsupported blockchain")
+            Bitcoin -> BitcoinAddressValidator.validate(address)
+            BitcoinTestnet -> BitcoinAddressValidator.validate(address, testNet = true)
+//            Ethereum -> EthereumAddressValidator.validate(address)
+//            Rootstock -> RootstockAddressValidator.validate(address)
+//            Cardano -> CardanoAddressValidator.validate(address)
+//            Ripple -> RippleAddressValidator.validate(address)
+//            Binance -> BinanceAddressValidator.validate(address)
+//            Stellar -> StellarAddressValidator.validate(address)
+        }
+    }
+
+    companion object {
+        private val values = values()
+        fun fromId(id: String): Blockchain = values.find { it.id == id } ?: Unknown
+        fun fromName(name: String): Blockchain = values.find { it.name == name } ?: Unknown
+        fun fromCurrency(currency: String): Blockchain = values.find { it.currency == currency }
+                ?: Unknown
+    }
+}

blockchain/src/main/java/com/tangem/blockchain/common/Wallet.kt

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+package com.tangem.blockchain.common
+
+import java.math.BigDecimal
+import java.util.*
+
+interface Wallet {
+    val config: WalletConfig
+    val address: String
+    val exploreUrl: String?
+    val shareUrl: String?
+}
+
+class WalletConfig(
+        val allowFeeSelection: Boolean,
+        val allowFeeInclusion: Boolean,
+        var allowExtract: Boolean = false,
+        var allowLoad: Boolean = false
+)
+
+data class Amount(
+        val type: AmountType = AmountType.Coin,
+        val currencySymbol: String,
+        val value: BigDecimal
+)
+
+data class Transaction(
+        val amount: Amount,
+        val fee: Amount?,
+        val sourceAddress: String,
+        val destinationAddress: String
+)
+
+enum class AmountType { Coin, Token, Reserve }
+
+enum class ValidationError { WrongAmount, WrongFee, WrongTotal }
+
+interface TransactionValidator{
+    fun validateTransaction(amount: Amount, fee: Amount?): EnumSet<ValidationError>
+}

blockchain/src/main/java/com/tangem/blockchain/common/WalletManager.kt

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+package com.tangem.blockchain.common
+
+interface WalletManager {
+    var wallet: Wallet
+    val blockchain: Blockchain
+
+    fun update()
+}
+
+interface TransactionBuilder {
+    fun getEstimateSize(transaction: Transaction): Int
+}
+
+interface TransactionSender {
+    fun send(transaction: Transaction, signer: TransactionSigner)
+}
+
+interface TransactionSigner
+
+interface FeeProvider {
+    fun getFee(amount: Amount, source: String, destination: String): List<Amount>
+}

blockchain/src/main/java/com/tangem/blockchain/wallets/CurrencyWallet.kt

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+package com.tangem.blockchain.wallets
+
+import com.tangem.blockchain.common.*
+import java.util.*
+
+class CurrencyWallet(
+        override val config: WalletConfig,
+        override val address: String,
+        override val exploreUrl: String?,
+        override val shareUrl: String?,
+        val pendingTransactions: List<Transaction> = listOf(),
+        val balances: List<Amount> = listOf(),
+        val isTestnet: Boolean = false
+) : Wallet, TransactionValidator {
+
+
+    override fun validateTransaction(amount: Amount, fee: Amount?): EnumSet<ValidationError> {
+        TODO("not implemented")
+    }
+}

blockchain/src/main/res/values/strings.xml

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+<resources>
+    <string name="app_name">Blockchain</string>
+</resources>