Using embedded wallets

Overview

The Kotlin SDK allows you to create and manage embedded wallets in your Android application. This includes creating wallets, deriving wallet accounts, and accessing wallet information. Before we start, ensure you’re familiar with the concepts of Wallets and Wallet Accounts.

Creating a wallet

After a user authenticates, you can create an embedded wallet for them using the createWallet function from the TurnkeyContext. You need to provide the wallet parameters, such as the wallet name and the accounts to derive. This example creates a wallet named “Wallet-<timestamp>” with both an Ethereum and a Solana account:

import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import com.turnkey.core.TurnkeyContext
import com.turnkey.types.V1AddressFormat
import com.turnkey.types.V1Curve
import com.turnkey.types.V1PathFormat
import com.turnkey.types.V1WalletAccountParams
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val button = findViewById<Button>(R.id.button)
        button.setOnClickListener {
            lifecycleScope.launch {
                try {
                    val accounts = listOf(
                        V1WalletAccountParams(
                            addressFormat = V1AddressFormat.ADDRESS_FORMAT_ETHEREUM,
                            curve = V1Curve.CURVE_SECP256K1,
                            path = "m/44'/60'/0'/0/0",
                            pathFormat = V1PathFormat.PATH_FORMAT_BIP32
                        ),
                        V1WalletAccountParams(
                            addressFormat = V1AddressFormat.ADDRESS_FORMAT_SOLANA,
                            curve = V1Curve.CURVE_ED25519,
                            path = "m/44'/501'/0'/0'",
                            pathFormat = V1PathFormat.PATH_FORMAT_BIP32
                        )
                    )
                    TurnkeyContext.createWallet(
                        walletName = "Wallet-${System.currentTimeMillis()}",
                        accounts = accounts,
                        mnemonicLength = 12
                    )
                } catch (t: Throwable) {
                    println(t)
                }
            }
        }
    }
}

This wallet can then be accessed through the wallets property in the TurnkeyContext. This property is a StateFlow that updates whenever wallets are created or modified.

val wallets = TurnkeyContext.wallets.value

You can also manually refresh the list of wallets by calling the refreshWallets function from the TurnkeyContext:

lifecycleScope.launch {
    TurnkeyContext.refreshWallets()
}

Creating wallet accounts

You can specify which accounts to derive when creating a wallet using the accounts parameter in the createWallet function, as shown in the previous section. Each account is defined using the V1WalletAccountParams class, where you can set properties

`V1WalletAccountParams`

Configuration used to derive a single wallet account (curve + derivation path + address format).

Property	Type	Required	Description
`addressFormat`	`V1AddressFormat`	yes	Output address format for the chain (e.g., `ADDRESS_FORMAT_ETHEREUM`, `ADDRESS_FORMAT_SOLANA`, `ADDRESS_FORMAT_TRON`).
`curve`	`V1Curve`	yes	Curve used to derive the key (e.g., `CURVE_SECP256K1` or `CURVE_ED25519`). Must match the chain.
`path`	`String`	yes	Derivation path (e.g., `"m/44'/60'/0'/0/0"` for Ethereum).
`pathFormat`	`V1PathFormat`	yes	Path syntax, always `PATH_FORMAT_BIP32`

After wallet creation

You can use the createWalletAccount function from the TurnkeyContext.client to add additional accounts to an existing wallet after it has been created.

import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import com.turnkey.core.TurnkeyContext
import com.turnkey.types.TCreateWalletAccountsBody
import com.turnkey.types.V1AddressFormat
import com.turnkey.types.V1Curve
import com.turnkey.types.V1PathFormat
import com.turnkey.types.V1WalletAccountParams
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val button = findViewById<Button>(R.id.button)
        button.setOnClickListener {
            lifecycleScope.launch {
                try {
                    val organizationId = TurnkeyContext.session.value?.organizationId
                        ?: throw Exception("No session found")
                    val selectedWallet = TurnkeyContext.wallets.value?.firstOrNull() ?: throw Exception(
                        "No wallet account found"
                    )

                    val accounts = listOf(
                        V1WalletAccountParams(
                            addressFormat = V1AddressFormat.ADDRESS_FORMAT_ETHEREUM,
                            curve = V1Curve.CURVE_SECP256K1,
                            path = "m/44'/60'/1'/0/0",
                            pathFormat = V1PathFormat.PATH_FORMAT_BIP32
                        ),
                        V1WalletAccountParams(
                            addressFormat = V1AddressFormat.ADDRESS_FORMAT_SOLANA,
                            curve = V1Curve.CURVE_ED25519,
                            path = "m/44'/501'/1'/0'",
                            pathFormat = V1PathFormat.PATH_FORMAT_BIP32
                        )
                    )

                    val res = TurnkeyContext.client.createWalletAccounts(
                        TCreateWalletAccountsBody(
                            organizationId = organizationId,
                            walletId = selectedWallet.id,
                            accounts = accounts
                        )
                    )

                    val createdAddresses = res.activity.result.createWalletAccountsResult!!.addresses
                    println(createdAddresses)
                } catch (t: Throwable) {
                    println(t)
                }
            }
        }
    }
}

Importing and exporting wallets

The Kotlin SDK lets you securely import/export wallets, accounts, and private keys using bundles you control, enabling backup, recovery, and migration.

Export

Wallets

Export a specified wallet and its accounts.

The Kotlin SDK wallet export will decrypt locally and return the secret to you (mnemonic).

import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import com.turnkey.core.TurnkeyContext
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val button = findViewById<Button>(R.id.button)
        button.setOnClickListener {
            lifecycleScope.launch {
                try {
                    val wallets = TurnkeyContext.wallets.value.orEmpty()
                    val selectedWallet = wallets.getOrNull(0) ?: return@launch

                    // Key material (mnemonic) will be returned here
                    val res = TurnkeyContext.exportWallet(
                        walletId = selectedWallet.id
                    )
                } catch (t: Throwable) {
                    println(t)
                }
            }
        }
    }
}

To receive an encrypted ExportBundle instead, use the lower-level client method:

import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import com.turnkey.core.TurnkeyContext
import com.turnkey.crypto.generateP256KeyPair
import com.turnkey.types.TExportWalletBody
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val button = findViewById<Button>(R.id.button)
        button.setOnClickListener {
            lifecycleScope.launch {
                val organizationId = TurnkeyContext.session.value?.organizationId ?: throw Exception("No session found")
                val wallets = TurnkeyContext.wallets.value.orEmpty()
                val selectedWallet = wallets.firstOrNull() ?: throw Exception("No wallet found")

                val (targetPublicKey, _, _) = generateP256KeyPair() // Import from com.turnkey.crypto

                try {
                    val res = TurnkeyContext.client.exportWallet(
                        TExportWalletBody(
                            organizationId = organizationId,
                            walletId = selectedWallet.id,
                            targetPublicKey = targetPublicKey,
                        )
                    )

                    val exportBundle = res.activity.result.exportWalletResult!!.exportBundle
                    // Store or transmit the exportBundle securely
                } catch (t: Throwable) {
                    println(t)
                }
            }
        }
    }
}

Wallet accounts

Export a specific wallet account.

The Kotlin SDK does currently provide helpers for exporting individual accounts. Use the lower-level client method:

import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import com.turnkey.core.TurnkeyContext
import com.turnkey.crypto.decryptExportBundle
import com.turnkey.crypto.generateP256KeyPair
import com.turnkey.types.TExportWalletAccountBody
import com.turnkey.utils.KeyFormat
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val button = findViewById<Button>(R.id.button)
        button.setOnClickListener {
            lifecycleScope.launch {
                val organizationId = TurnkeyContext.session.value?.organizationId ?: throw Exception("No session found")
                val wallets = TurnkeyContext.wallets.value.orEmpty()
                val selectedWallet = wallets.firstOrNull() ?: throw Exception("No wallet found")
                val selectedAccount = selectedWallet.accounts.firstOrNull() ?: throw Exception("No wallet account found")

                val (targetPublicKey, _, embeddedPriv) = generateP256KeyPair() // Import from com.turnkey.crypto

                try {
                    val res = TurnkeyContext.client.exportWalletAccount(
                        TExportWalletAccountBody(
                            organizationId = organizationId,
                            address = selectedAccount.address,
                            targetPublicKey = targetPublicKey,
                        )
                    )

                    val exportBundle = res.activity.result.exportWalletAccountResult!!.exportBundle

                    val keyMaterial = decryptExportBundle(
                        exportBundle = exportBundle,
                        organizationId = organizationId,
                        embeddedPrivateKey = embeddedPriv,
                        dangerouslyOverrideSignerPublicKey = null,
                        keyFormat = KeyFormat.other, // or KeyFormat.solana for solana accounts
                        returnMnemonic = false
                    )
                    // Store or transmit the key material securely
                } catch (t: Throwable) {
                    println(t)
                }
            }
        }
    }
}

Import

Imports take plaintext material (mnemonic or raw private key) and the SDK handles initialization and encryption behind the scenes.

Wallets

Imports a wallet from a mnemonic. Optionally pre-create accounts.

import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import androidx.core.widget.doOnTextChanged
import androidx.lifecycle.lifecycleScope
import com.google.android.material.textfield.TextInputEditText
import com.turnkey.core.TurnkeyContext
import com.turnkey.types.V1AddressFormat
import com.turnkey.types.V1Curve
import com.turnkey.types.V1PathFormat
import com.turnkey.types.V1WalletAccountParams
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {
    private val mnemonic = MutableStateFlow<String?>(null)
    private val name = MutableStateFlow<String?>(null)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val mnemonicInput = findViewById<TextInputEditText>(R.id.mnemonicInput)
        mnemonicInput.doOnTextChanged { text, start, before, count ->
            mnemonic.value = text.toString()
        }

        val nameInput = findViewById<TextInputEditText>(R.id.nameInput)
        nameInput.doOnTextChanged { text, start, before, count ->
            name.value = text.toString()
        }

        val button = findViewById<Button>(R.id.button)
        button.setOnClickListener {
            lifecycleScope.launch {
                try {
                    val m = mnemonic.value ?: throw Exception("No mnemonic entered") // Your user's mnemonic string from StateFlow
                    val walletName = name.value ?: "Wallet-${System.currentTimeMillis()}"

                    // Optionally define accounts to derive upon import
                    val accounts = listOf(
                        V1WalletAccountParams(
                            addressFormat = V1AddressFormat.ADDRESS_FORMAT_ETHEREUM,
                            curve = V1Curve.CURVE_SECP256K1,
                            path = "m/44'/60'/0'/0/0",
                            pathFormat = V1PathFormat.PATH_FORMAT_BIP32
                        ),
                        V1WalletAccountParams(
                            addressFormat = V1AddressFormat.ADDRESS_FORMAT_SOLANA,
                            curve = V1Curve.CURVE_ED25519,
                            path = "m/44'/501'/0'/0'",
                            pathFormat = V1PathFormat.PATH_FORMAT_BIP32
                        )
                    )

                    TurnkeyContext.importWallet(
                        walletName = walletName,
                        mnemonic = m,
                        accounts = accounts
                    )
                } catch (t: Throwable) {
                    println(t)
                }
            }
        }
    }
}

Next steps

Check out the Signing guide to learn how to sign transactions and messages with the embedded wallets you’ve created.

​Overview

​Creating a wallet

​Creating wallet accounts

​V1WalletAccountParams

​After wallet creation

​Importing and exporting wallets

​Export

​Wallets

​Wallet accounts

​Import

​Wallets

​Next steps

Overview

Creating a wallet

Creating wallet accounts

`V1WalletAccountParams`

After wallet creation

Importing and exporting wallets

Export

Wallets

Wallet accounts

Import

Wallets

Next steps