@arkade-os/sdk Documentation - v0.4.21
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    @arkade-os/sdk Documentation - v0.4.21

    Arkade TypeScript SDK

    The Arkade SDK is a TypeScript library for building Bitcoin wallets using the Arkade protocol.

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    npm install @arkade-os/sdk

    import {
      MnemonicIdentity,
      Wallet,
    } from '@arkade-os/sdk'
    import { generateMnemonic } from '@scure/bip39'
    import { wordlist } from '@scure/bip39/wordlists/english.js'

    // Generate a new mnemonic or use an existing one
    const mnemonic = generateMnemonic(wordlist)
    const identity = MnemonicIdentity.fromMnemonic(mnemonic)

    // Create a wallet with Arkade support
    const wallet = await Wallet.create({
      identity,
      arkServerUrl: 'https://arkade.computer',
    })

    The SDK supports read-only wallets that allow you to query wallet state without exposing private keys. This is useful for:

    • Watch-only wallets: Monitor addresses and balances without transaction capabilities
    • Public interfaces: Display wallet information safely in public-facing applications
    • Separate concerns: Keep signing operations isolated from query operations
    import { SingleKey, ReadonlySingleKey, ReadonlyWallet } from '@arkade-os/sdk'

    // Create a read-only identity from a public key
    const identity = SingleKey.fromHex('e09ca...56609')
    const publicKey = await identity.compressedPublicKey()
    const readonlyIdentity = ReadonlySingleKey.fromPublicKey(publicKey)

    // Create a read-only wallet
    const readonlyWallet = await ReadonlyWallet.create({
      identity: readonlyIdentity,
      arkServerUrl: 'https://arkade.computer'
    })

    // Query operations work normally
    const address = await readonlyWallet.getAddress()
    const balance = await readonlyWallet.getBalance()
    const vtxos = await readonlyWallet.getVtxos()
    const history = await readonlyWallet.getTransactionHistory()

    // Transaction methods are not available (TypeScript will prevent this)
    // await readonlyWallet.send(...) // ❌ Type error!

    import { Wallet, MnemonicIdentity } from '@arkade-os/sdk'

    // Create a full wallet
    const identity = MnemonicIdentity.fromMnemonic('abandon abandon...')
    const wallet = await Wallet.create({
      identity,
      arkServerUrl: 'https://arkade.computer'
    })

    // Convert to read-only wallet (safe to share)
    const readonlyWallet = await wallet.toReadonly()

    // The read-only wallet can query but not transact
    const balance = await readonlyWallet.getBalance()

    import { MnemonicIdentity } from '@arkade-os/sdk'

    // Full identity
    const identity = MnemonicIdentity.fromMnemonic('abandon abandon...')

    // Convert to read-only (no signing capability)
    const readonlyIdentity = await identity.toReadonly()

    // Use in read-only wallet
    const readonlyWallet = await ReadonlyWallet.create({
      identity: readonlyIdentity,
      arkServerUrl: 'https://arkade.computer'
    })

    The SDK supports key derivation from BIP39 mnemonic phrases or raw seeds using BIP86 (Taproot) output descriptors. This is the recommended identity type for new integrations — it uses standard derivation paths that are interoperable with other wallets and HD-ready for future multi-address support.

    Note: Prefer MnemonicIdentity or SeedIdentity over SingleKey for new applications. SingleKey exists for backward compatibility with raw private keys.

    import { MnemonicIdentity, Wallet } from '@arkade-os/sdk'
    import { generateMnemonic } from '@scure/bip39'
    import { wordlist } from '@scure/bip39/wordlists/english.js'

    // Generate a new 12-word mnemonic
    const mnemonic = generateMnemonic(wordlist)

    // Create identity from a 12 or 24 word mnemonic
    const identity = MnemonicIdentity.fromMnemonic(mnemonic)

    // With optional passphrase for additional security
    const identityWithPassphrase = MnemonicIdentity.fromMnemonic(mnemonic, {
      passphrase: 'my secret passphrase'
    })

    // Create wallet as usual
    const wallet = await Wallet.create({
      identity: identityWithPassphrase,
      arkServerUrl: 'https://arkade.computer'
    })

    import { SeedIdentity } from '@arkade-os/sdk'
    import { mnemonicToSeedSync } from '@scure/bip39'

    // If you already have a 64-byte seed
    const seed = mnemonicToSeedSync(mnemonic)
    const identity = SeedIdentity.fromSeed(seed)

    // Or with a custom output descriptor
    const identityWithDescriptor = SeedIdentity.fromSeed(seed, { descriptor })

    // Or with a custom descriptor and passphrase (MnemonicIdentity)
    const identityWithDescriptorAndPassphrase = MnemonicIdentity.fromMnemonic(mnemonic, {
      descriptor,
      passphrase: 'my secret passphrase'
    })

    Create watch-only wallets from an output descriptor:

    import { MnemonicIdentity, ReadonlyDescriptorIdentity, ReadonlyWallet } from '@arkade-os/sdk'
    import { generateMnemonic } from '@scure/bip39'
    import { wordlist } from '@scure/bip39/wordlists/english.js'

    // From a full identity
    const mnemonic = generateMnemonic(wordlist)
    const identity = MnemonicIdentity.fromMnemonic(mnemonic)
    const readonly = await identity.toReadonly()

    // Or directly from a descriptor (e.g., from another wallet)
    const descriptor = "tr([12345678/86'/0'/0']xpub.../0/0)"
    const readonlyFromDescriptor = ReadonlyDescriptorIdentity.fromDescriptor(descriptor)

    // Use in a watch-only wallet
    const readonlyWallet = await ReadonlyWallet.create({
      identity: readonly,
      arkServerUrl: 'https://arkade.computer'
    })

    // Can query but not sign
    const balance = await readonlyWallet.getBalance()

    Derivation Path: m/86'/{coinType}'/0'/0/0

    • BIP86 (Taproot) purpose
    • Coin type 0 for mainnet, 1 for testnet
    • Account 0, external chain, first address

    The descriptor format (tr([fingerprint/path']xpub.../0/0)) is HD-ready — future versions will support deriving multiple addresses and change outputs from the same seed.

    Arkade send transactions require N+1 PSBT signatures (N checkpoints + 1 main tx). With local identities like SingleKey or SeedIdentity this is invisible, but browser wallet extensions (Xverse, UniSat, OKX, etc.) show a confirmation popup per signature. The BatchSignableIdentity interface lets wallet providers reduce N+1 popups to a single batch confirmation.

    import {
      BatchSignableIdentity,
      SignRequest,
      isBatchSignable,
      Wallet
    } from '@arkade-os/sdk'

    // Implement the interface in your wallet provider
    class MyBrowserWallet implements BatchSignableIdentity {
      // ... implement Identity methods (sign, signMessage, xOnlyPublicKey, etc.)

      async signMultiple(requests: SignRequest[]): Promise<Transaction[]> {
        // Convert all PSBTs to your wallet's batch signing API format
        const psbts = requests.map(r => r.tx.toPSBT())
        // Single wallet popup for all signatures
        const signedPsbts = await myWalletExtension.signAllPSBTs(psbts)
        return signedPsbts.map(psbt => Transaction.fromPSBT(psbt))
      }
    }

    // The SDK automatically detects batch-capable identities
    const identity = new MyBrowserWallet()
    console.log(isBatchSignable(identity)) // true

    // Wallet.send() uses one popup instead of N+1
    const wallet = await Wallet.create({ identity, arkServerUrl: 'https://arkade.computer' })
    await wallet.send({ address: 'ark1q...', amount: 1000 })

    Identities without signMultiple continue to work unchanged — each checkpoint is signed individually via sign().

    import { waitForIncomingFunds } from '@arkade-os/sdk'

    // Get wallet addresses
    const arkadeAddress = await wallet.getAddress()
    const boardingAddress = await wallet.getBoardingAddress()
    console.log('Arkade Address:', arkadeAddress)
    console.log('Boarding (Mainnet) Address:', boardingAddress)

    const incomingFunds = await waitForIncomingFunds(wallet)
    if (incomingFunds.type === "vtxo") {
      // Virtual outputs received 
      console.log("VTXOs: ", incomingFunds.newVtxos)
    } else if (incomingFunds.type === "utxo") {
      // Boarding inputs received
      console.log("UTXOs: ", incomingFunds.coins)
    }

    Onboarding allows you to swap onchain funds into virtual outputs:

    import { Ramps } from '@arkade-os/sdk'

    const boardingTxId = await new Ramps(wallet).onboard();

    // Get detailed balance information
    const balance = await wallet.getBalance()
    console.log('Total Balance:', balance.total)
    console.log('Boarding Total:', balance.boarding.total)
    console.log('Offchain Available:', balance.available)
    console.log('Offchain Settled:', balance.settled)
    console.log('Offchain Preconfirmed:', balance.preconfirmed)
    console.log('Recoverable:', balance.recoverable)

    // Get virtual outputs (available for offchain spending)
    const vtxos = await wallet.getVtxos()

    // Get boarding inputs
    const boardingInputs = await wallet.getBoardingUtxos()

    // Send bitcoin instantly offchain
    const txid = await wallet.send({
      address: 'ark1q...',  // arkade address
      amount: 50_000,       // in satoshis
    })

    The wallet's assetManager lets you create and manage assets on Arkade. The send method supports sending assets.

    // Issue a new asset (non-reissuable by default)
    const { assetId: controlAssetId } = await wallet.assetManager.issue({
      amount: 1,
      metadata: {
        ticker: 'ctrl-MTK'
      }
    })

    // Issue a new asset referencing the control asset
    const { assetId } = await wallet.assetManager.issue({
      amount: 500,
      controlAssetId,
      metadata: {
        ticker: 'MTK'
      }
    })

    // Reissue more supply of the asset (requires ownership of the control asset)
    const reissuanceTxId = await wallet.assetManager.reissue({
      assetId,
      amount: 500,
    })

    // Burn some of the asset
    const burnTxId = await wallet.assetManager.burn({
      assetId,
      amount: 200,
    })

    // Send asset to another Arkade address
    const sendTxId = await wallet.send({
      address: 'ark1q...',
      assets: [{ assetId, amount: 100 }],
    })

    // Check remaining balance
    const { assets } = await wallet.getBalance()
    const assetBalance = assets.find(asset => asset.assetId === assetId)?.amount

    The settle method can be used to move preconfirmed balances into finalized balances and to manually convert onchain funds to virtual outputs.

    // Fetch offchain preconfirmed outputs and onchain boarding inputs
    const [vtxos, boardingInputs] = await Promise.all([
      wallet.getVtxos(),
      wallet.getBoardingUtxos()
    ])

    // For settling transactions
    const settlementTxId = await wallet.settle({
      inputs: [...vtxos, ...boardingInputs],
      // Optional: specify a mainnet output
      outputs: [{
        address: "bc1p...",
        amount: 100_000n
      }]
    })

    Virtual outputs have an expiration time (batch expiry).

    The SDK provides the VtxoManager class to handle:

    • Renewal: Renew virtual outputs before they expire to maintain unilateral control of the funds.
    • Recovery: Reclaim swept or expired virtual outputs back to the wallet in case renewal window was missed.
    • Boarding Input Sweep: Sweep expired boarding inputs back to a fresh boarding address to restart the timelock.

    The recommended way to configure VtxoManager is via settlementConfig on the wallet. If you omit settlementConfig, settlement is enabled with the default behavior: Virtual output renewal at 3 days and boarding input sweep enabled.

    const wallet = await Wallet.create({
      identity,
      arkServerUrl: 'https://arkade.computer',
      // Enable settlement with defaults explicitly:
      settlementConfig: {
        // Seconds before virtual output expiry to trigger renewal
        vtxoThreshold: 60 * 60 * 24 * 3, // 3 days
        // Whether to sweep expired boarding inputs back to a fresh boarding address
        boardingUtxoSweep: true,
        // Polling interval in milliseconds for checking boarding inputs
        pollIntervalMs: 60_000 // 1 minute
      },
    })

    // Enable both virtual output renewal and boarding input sweep
    const wallet = await Wallet.create({
      identity,
      arkServerUrl: 'https://arkade.computer',
      settlementConfig: {
        vtxoThreshold: 60 * 60 * 24,  // renew when 24 hours remain (in seconds)
        boardingUtxoSweep: true,      // sweep expired boarding inputs
      },
    })

    // Explicitly disable all settlement
    const wallet = await Wallet.create({
      identity,
      arkServerUrl: 'https://arkade.computer',
      settlementConfig: false,
    })

    Access the VtxoManager from the wallet after configuring settlementConfig:

    const manager = await wallet.getVtxoManager()

    Migration from renewalConfig: Directly initializing a VtxoManager with renewalConfig is still supported but deprecated. Prefer settlementConfig where vtxoThreshold is expressed in seconds instead of milliseconds.

    Renew virtual outputs before they expire to retain unilateral control of funds. This settles expiring and recoverable virtual outputs back to your wallet, refreshing their expiration time.

    // Renew all virtual outputs to prevent expiration
    const txid = await manager.renewVtxos()
    // Check which virtual outputs are expiring soon
    const expiringVtxos = await manager.getExpiringVtxos()
    // Override thresholdMs (e.g., get virtual outputs expiring in the next 60 seconds)
    const urgentlyExpiring = await manager.getExpiringVtxos(60_000)

    When a boarding input's CSV timelock expires, it can no longer be onboarded into Arkade cooperatively. The sweep feature detects these expired UTXOs and builds a raw onchain transaction that spends them via the unilateral exit path back to a fresh boarding address, restarting the timelock.

    • Multiple expired UTXOs are batched into a single transaction (many inputs, one output)
    • A dust check ensures the sweep is skipped if fees would consume the entire value
    // Check for expired boarding inputs
    const expired = await manager.getExpiredBoardingUtxos()
    console.log(`${expired.length} expired boarding inputs`)

    // Sweep them back to a fresh boarding address (requires boardingUtxoSweep: true)
    try {
      const txid = await manager.sweepExpiredBoardingUtxos()
      console.log('Swept expired boarding inputs:', txid)
    } catch (e) {
      // "No expired boarding inputs to sweep" or "Sweep not economical"
    }

    Recover virtual outputs that have been swept by the server or consolidate small amounts (subdust).

    // Recover swept virtual outputs and preconfirmed subdust
    const txid = await manager.recoverVtxos((event) => {
      console.log('Settlement event:', event.type)
    })
    console.log('Recovered:', txid)
    // Check what's recoverable
    const balance = await manager.getRecoverableBalance()

    Delegation allows users to outsource virtual output renewal to a third-party delegation service.

    Instead of the delegating user renewing virtual outputs by themself, their delegate will automatically settle them before they expire, sending the funds back to the delegator's wallet address (minus a service fee).

    This is useful for wallets that cannot be online 24/7.

    When a delegatorProvider is configured, the wallet address includes an extra tapscript path that authorizes the delegate to co-sign renewals alongside the Arkade server.

    To run a delegation service, you'll need to set up a Fulmine server with the Delegation API enabled.

    import { Wallet, MnemonicIdentity, RestDelegatorProvider } from '@arkade-os/sdk'

    const wallet = await Wallet.create({
      identity: MnemonicIdentity.fromMnemonic('abandon abandon...'),
      arkServerUrl: 'https://arkade.computer',
      delegatorProvider: new RestDelegatorProvider('http://localhost:7001'),
    })

    Note: Adding a delegatorProvider changes your wallet address because the offchain tapscript includes an additional delegation path. Funds sent to an address without delegation cannot be delegated, and vice versa.

    Once the wallet is configured with a delegate, use wallet.delegatorManager to delegate your virtual outputs:

    // Get spendable virtual outputs (including recoverable)
    const vtxos = await wallet.getVtxos({ withRecoverable: true })

    // Delegate all virtual outputs — the delegate will renew them before expiry
    const arkadeAddress = await wallet.getAddress()
    const delegatorManager = await wallet.getDelegatorManager();
    const delegationResult = await delegatorManager.delegate(vtxos, arkadeAddress)

    console.log('Delegated:', delegationResult.delegated.length)
    console.log('Failed:', delegationResult.failed.length)

    The delegate method groups virtual outputs by expiry date and submits them to the delegation service.

    By default, delegation is scheduled at 90% of each virtual output's remaining lifetime.

    You can override this with an explicit date:

    // Delegate with a specific renewal time
    const delegateAt = new Date(Date.now() + 12 * 60 * 60 * 1000) // 12 hours from now
    await delegatorManager.delegate(vtxos, arkadeAddress, delegateAt)

    When using a service worker wallet, pass the delegatorUrl option. The service worker will automatically delegate virtual outputs after each update:

    import { ServiceWorkerWallet, MnemonicIdentity } from '@arkade-os/sdk'

    const wallet = await ServiceWorkerWallet.setup({
      serviceWorkerPath: '/service-worker.js',
      arkServerUrl: 'https://arkade.computer',
      identity: MnemonicIdentity.fromMnemonic('abandon abandon...'),
      delegatorUrl: 'http://localhost:7001',
    })

    You can query the delegation service directly to inspect its public key, fee, and payment address:

    import { RestDelegatorProvider } from '@arkade-os/sdk'

    const provider = new RestDelegatorProvider('https://delegator.example.com')
    const info = await provider.getDelegateInfo()

    console.log('Delegate public key:', info.pubkey)
    console.log('Service fee (sats):', info.fee)
    console.log('Fee address:', info.delegatorAddress)

    Sign and verify messages using BIP-322. Supports P2TR (Taproot) signing, and verification for P2TR, P2WPKH, and legacy P2PKH addresses.

    import { BIP322, MnemonicIdentity } from '@arkade-os/sdk'

    const identity = MnemonicIdentity.fromMnemonic('abandon abandon...')

    // Sign a message (P2TR key-spend)
    const signature = await BIP322.sign('Hello Bitcoin!', identity)

    // Verify against a P2TR address
    const valid = BIP322.verify('Hello Bitcoin!', signature, 'bc1p...')

    // Also works with P2WPKH and legacy P2PKH addresses
    BIP322.verify('Hello Bitcoin!', sig, 'bc1q...')  // P2WPKH
    BIP322.verify('Hello Bitcoin!', sig, '1A1zP1...')  // legacy P2PKH

    // Get transaction history
    const history = await wallet.getTransactionHistory()
    /*
    {
        key: {
            boardingTxid: string;
            commitmentTxid: string;
            arkTxid: string;
        };
        type: "SENT" | "RECEIVED";
        amount: number;
        settled: boolean;
        createdAt: number;
        assets?: Array<{
            assetId: string,
            amount: number
        }>
    }
    */

    Collaborative exit or "offboarding" allows you to withdraw your virtual funds to an onchain address:

    import { Wallet, MnemonicIdentity, Ramps } from '@arkade-os/sdk'

    const wallet = await Wallet.create({
      identity: MnemonicIdentity.fromMnemonic('abandon abandon...'),
      arkServerUrl: 'https://arkade.computer'
    })

    // Get fee information from the server
    const { fees: feeInfo } = await wallet.arkProvider.getInfo();

    const exitTxid = await new Ramps(wallet).offboard(
      'bc1p...',
      feeInfo
    );

    Unilateral exit allows you to withdraw your funds from the Arkade protocol back to the Bitcoin blockchain without requiring cooperation from the Arkade server. This process involves two main steps:

    1. Unrolling: Broadcasting the transaction chain from offchain back to onchain
    2. Completing the exit: Spending the unrolled virtual outputs after the timelock expires
    import { MnemonicIdentity, OnchainWallet, Unroll } from '@arkade-os/sdk'

    // Create an identity for the onchain wallet
    const onchainIdentity = MnemonicIdentity.fromMnemonic('abandon abandon...')

    // Create an onchain wallet to pay for P2A outputs in virtual output branches
    // OnchainWallet implements the AnchorBumper interface
    const onchainWallet = await OnchainWallet.create(onchainIdentity, 'regtest');

    // Unroll a specific virtual output
    const vtxo = { txid: 'your_vtxo_txid', vout: 0 };
    const session = await Unroll.Session.create(
      vtxo,
      onchainWallet,
      onchainWallet.provider,
      wallet.indexerProvider
    );

    // Iterate through the unrolling steps
    for await (const step of session) {
      switch (step.type) {
        case Unroll.StepType.WAIT:
          console.log(`Waiting for transaction ${step.txid} to be confirmed`);
          break;
        case Unroll.StepType.UNROLL:
          console.log(`Broadcasting transaction ${step.tx.id}`);
          break;
        case Unroll.StepType.DONE:
          console.log(`Unrolling complete for virtual output ${step.vtxoTxid}`);
          break;
      }
    }

    The unrolling process works by:

    • Traversing the transaction chain from the root (most recent) to the leaf (oldest)
    • Broadcasting each transaction that isn't already onchain
    • Waiting for confirmations between steps
    • Using P2A (Pay-to-Anchor) transactions to pay for fees

    Once virtual outputs are fully unrolled and the unilateral exit timelock has expired, you can complete the exit:

    // Complete the exit for specific virtual outputs
    await Unroll.completeUnroll(
      wallet,
      [vtxo.txid], // Array of virtual output transaction IDs to complete
      onchainWallet.address // Address to receive the exit amount
    );

    Important Notes:

    • Each virtual output may require multiple unroll steps depending on the transaction chain length
    • Each unroll step must be confirmed before proceeding to the next
    • The completeUnroll method can only be called after all virtual outputs are fully unrolled and the timelock has expired
    • You need sufficient onchain funds in the OnchainWallet to pay for P2A transaction fees

    The SDK provides a MessageBus orchestrator that runs inside a service worker and routes messages to pluggable MessageHandlers. The built-in WalletMessageHandler exposes all wallet operations over this message bus, and ServiceWorkerWallet is a client-side proxy that communicates with it transparently.

    // service-worker.js
    import {
      MessageBus,
      WalletMessageHandler,
      IndexedDBWalletRepository,
      IndexedDBContractRepository,
    } from '@arkade-os/sdk'

    const walletRepo = new IndexedDBWalletRepository()
    const contractRepo = new IndexedDBContractRepository()

    const bus = new MessageBus(walletRepo, contractRepo, {
      messageHandlers: [new WalletMessageHandler()],
      tickIntervalMs: 10_000, // default 10s
    })

    bus.start()

    // app.ts
    import { ServiceWorkerWallet, MnemonicIdentity } from '@arkade-os/sdk'

    // One-liner: registers the SW, initializes the MessageBus, and creates the wallet
    const wallet = await ServiceWorkerWallet.setup({
      serviceWorkerPath: '/service-worker.js',
      arkServerUrl: 'https://arkade.computer',
      identity: MnemonicIdentity.fromMnemonic('abandon abandon...'),
    })

    // Use like any other wallet — calls are proxied to the service worker
    const address = await wallet.getAddress()
    const balance = await wallet.getBalance()

    For watch-only wallets, use ServiceWorkerReadonlyWallet with a ReadonlySingleKey identity instead.

    The worker captures the background processing infrastructure for the SDK. Two platform-specific implementations share common patterns (pluggable handlers, periodic scheduling, repository/provider dependency injection) but differ in orchestration and communication.

    Platform Directory Orchestrator Communication
    Browser browser/ MessageBus inside a Service Worker postMessage between SW and window clients
    Expo/React Native expo/ runTasks() called from foreground interval and OS background wake AsyncStorageTaskQueue inbox/outbox

    See the platform READMEs for architecture details, runtime flow, and usage examples.

    The StorageAdapter API is deprecated. Use repositories instead. If you omit storage, the SDK uses IndexedDB repositories with the default database name.

    Warning

    If you previously used the v1 StorageAdapter-based repositories, migrate data into the new IndexedDB repositories before use:

    import {
      IndexedDBWalletRepository,
      IndexedDBContractRepository,
      getMigrationStatus,
      migrateWalletRepository,
      rollbackMigration,
    } from '@arkade-os/sdk'
    import { IndexedDBStorageAdapter } from '@arkade-os/sdk/adapters/indexedDB'

    const oldStorage = new IndexedDBStorageAdapter('legacy-wallet', 1)
    const newDbName = 'my-app-db'
    const walletRepository = new IndexedDBWalletRepository(newDbName)

    // Check migration status before running
    const status = await getMigrationStatus('wallet', oldStorage)
    // status: "not-needed" | "pending" | "in-progress" | "done"

    if (status === 'pending' || status === 'in-progress') {
      try {
        await migrateWalletRepository(oldStorage, walletRepository, {
          onchain: [ 'address-1', 'address-2' ],
          offchain: [ 'onboarding-address-1' ],
        })
      } catch (err) {
        // Reset migration flag so the next attempt starts clean
        await rollbackMigration('wallet', oldStorage)
        throw err
      }
    }

    Migration status helpers:

    Helper Description
    getMigrationStatus(repoType, adapter) Returns "not-needed" (no legacy DB), "pending", "in-progress" (interrupted), or "done"
    requiresMigration(repoType, adapter) Returns true if status is "pending" or "in-progress"
    rollbackMigration(repoType, adapter) Removes the migration flag so migration can re-run from scratch
    MIGRATION_KEY(repoType) Returns the storage key used for the migration flag

    migrateWalletRepository sets an "in-progress" flag before copying data. If the process crashes mid-way, the flag remains as "in-progress" so the next call to getMigrationStatus can detect the partial migration. Old data is never deleted — re-running migration after a rollback is safe.

    Anything related to contract repository migration must be handled by the package which created them. The SDK doesn't manage contracts in V1. Data remains untouched and persisted in the same old location.

    If you persisted custom data in the ContractRepository via its setContractData method, or a custom collection via saveToContractCollection, you'll need to migrate it manually:

    // Custom data stored in the ContractRepository
    const oldStorage = new IndexedDBStorageAdapter('legacy-wallet', 1)
    const oldRepo = new ContractRepositoryImpl(storageAdapter)
    const customContract = await oldRepo.getContractData('my-contract', 'status')
    await contractRepository.setContractData('my-contract', 'status', customData)
    const customCollection = await oldRepo.getContractCollection('swaps')
    await contractRepository.saveToContractCollection('swaps', customCollection)

    WalletRepository, ContractRepository, and SwapRepository (in @arkade-os/boltz-swap) each declare a readonly version field with a literal type. All built-in implementations set this to the current version. If you maintain a custom repository implementation, TypeScript will produce a compile error when the version is bumped, signaling that a semantic update is required:

    import { WalletRepository } from '@arkade-os/sdk'

    class MyWalletRepository implements WalletRepository {
      readonly version = 1 // must match the interface's literal type
      // ...
    }

    For Node.js or React Native environments, use the SQLite repository with any SQLite driver. The SDK accepts a SQLExecutor interface — you provide the driver, the SDK handles the schema.

    See examples/node/multiple-wallets.ts for a full working example using better-sqlite3.

    import { MnemonicIdentity, Wallet } from '@arkade-os/sdk'
    import { SQLiteWalletRepository, SQLiteContractRepository, SQLExecutor } from '@arkade-os/sdk/repositories/sqlite'
    import Database from 'better-sqlite3'

    const db = new Database('my-wallet.sqlite')
    db.pragma('journal_mode = WAL')

    const executor: SQLExecutor = {
      run: async (sql, params) => { db.prepare(sql).run(...(params ?? [])) },
      get: async (sql, params) => db.prepare(sql).get(...(params ?? [])) as any,
      all: async (sql, params) => db.prepare(sql).all(...(params ?? [])) as any,
    }

    const wallet = await Wallet.create({
      identity: MnemonicIdentity.fromMnemonic('abandon abandon...'),
      arkServerUrl: 'https://arkade.computer',
      storage: {
        walletRepository: new SQLiteWalletRepository(executor),
        contractRepository: new SQLiteContractRepository(executor),
      },
    })

    For React Native apps using Realm, pass your Realm instance directly:

    import {
      RealmWalletRepository,
      RealmContractRepository,
      ArkRealmSchemas,
      ARK_REALM_SCHEMA_VERSION,
      runArkRealmMigrations,
    } from '@arkade-os/sdk/repositories/realm'

    const realm = await Realm.open({
      schema: [...ArkRealmSchemas, ...yourSchemas],
      schemaVersion: Math.max(ARK_REALM_SCHEMA_VERSION, yourSchemaVersion),
      onMigration: (oldRealm, newRealm) => {
        runArkRealmMigrations(oldRealm, newRealm)
        // your own migrations
      },
    })
    const wallet = await Wallet.create({
      identity,
      arkServerUrl: 'https://arkade.computer',
      storage: {
        walletRepository: new RealmWalletRepository(realm),
        contractRepository: new RealmContractRepository(realm),
      },
    })

    In the browser, the SDK defaults to IndexedDB repositories when no storage is provided:

    import { MnemonicIdentity, Wallet } from '@arkade-os/sdk'

    const wallet = await Wallet.create({
      identity: MnemonicIdentity.fromMnemonic('abandon abandon...'),
      arkServerUrl: 'https://arkade.computer',
      // Uses IndexedDB by default in the browser
    })

    If you want a custom database name or a different repository implementation, pass storage explicitly.

    For ephemeral storage (no persistence), pass the in-memory repositories:

    import {
      MnemonicIdentity,
      Wallet,
      InMemoryWalletRepository,
      InMemoryContractRepository
    } from '@arkade-os/sdk'

    const wallet = await Wallet.create({
      identity: MnemonicIdentity.fromMnemonic('abandon abandon...'),
      arkServerUrl: 'https://arkade.computer',
      storage: {
        walletRepository: new InMemoryWalletRepository(),
        contractRepository: new InMemoryContractRepository()
      }
    })

    Node.js does not provide a global EventSource implementation. The SDK relies on EventSource for Server-Sent Events during settlement (onboarding/offboarding) and contract watching. You must polyfill it before using the SDK:

    npm install eventsource

    import { EventSource } from "eventsource";
    (globalThis as any).EventSource = EventSource;

    // Use dynamic import so the polyfill is set before the SDK evaluates
    const { Wallet } = await import("@arkade-os/sdk");

    If you also need IndexedDB persistence (e.g. for WalletRepository), set up the shim before any SDK import:

    // Must define `self` BEFORE calling setGlobalVars
    if (typeof self === "undefined") {
        (globalThis as any).self = globalThis;
    }
    import setGlobalVars from "indexeddbshim/src/node-UnicodeIdentifiers";
    (globalThis as any).window = globalThis;
    setGlobalVars(null, { checkOrigin: false });

    Note: eventsource and indexeddbshim are optional peer dependencies. Without the EventSource polyfill, settlement operations will fail with ReferenceError: EventSource is not defined.

    See examples/node/multiple-wallets.ts for a complete working example.

    For React Native and Expo applications where standard EventSource and fetch streaming may not work properly, use the Expo-compatible providers:

    import { Wallet, MnemonicIdentity } from '@arkade-os/sdk'
    import { ExpoArkProvider, ExpoIndexerProvider } from '@arkade-os/sdk/adapters/expo'

    const identity = MnemonicIdentity.fromMnemonic('abandon abandon...')

    const wallet = await Wallet.create({
      identity: identity,
      arkProvider: new ExpoArkProvider('https://arkade.computer'), // For settlement events and transactions streaming
      indexerProvider: new ExpoIndexerProvider('https://arkade.computer'), // For address subscriptions and virtual output state updates
    })

    // use expo/fetch for streaming support (SSE)
    // All other wallet functionality remains the same
    const balance = await wallet.getBalance()
    const address = await wallet.getAddress()

    Both ExpoArkProvider and ExpoIndexerProvider are available as adapters following the SDK's modular architecture pattern. This keeps the main SDK bundle clean while providing opt-in functionality for specific environments:

    • ExpoArkProvider: Handles settlement events and transaction streaming using expo/fetch for Server-Sent Events
    • ExpoIndexerProvider: Handles address subscriptions and virtual output state updates using expo/fetch for JSON streaming

    For persistence in Expo/React Native, use the SQLite repository with expo-sqlite:

    import { SQLiteWalletRepository, SQLiteContractRepository } from '@arkade-os/sdk/repositories/sqlite'
    import * as SQLite from 'expo-sqlite'

    const db = SQLite.openDatabaseSync('my-wallet.db')
    const executor = {
      run: (sql, params) => db.runAsync(sql, params ?? []),
      get: (sql, params) => db.getFirstAsync(sql, params ?? []),
      all: (sql, params) => db.getAllAsync(sql, params ?? []),
    }

    const wallet = await Wallet.create({
      identity,
      arkServerUrl: 'https://arkade.computer',
      arkProvider: new ExpoArkProvider('https://arkade.computer'),
      indexerProvider: new ExpoIndexerProvider('https://arkade.computer'),
      storage: {
        walletRepository: new SQLiteWalletRepository(executor),
        contractRepository: new SQLiteContractRepository(executor),
      },
    })

    Install expo-crypto and polyfill crypto.getRandomValues() at the top of your app entry point:

    npx expo install expo-crypto

    // App.tsx or index.js - MUST be first import
    import * as Crypto from 'expo-crypto';
    if (!global.crypto) global.crypto = {} as any;
    global.crypto.getRandomValues = Crypto.getRandomValues;

    // Now import the SDK
    import { Wallet, MnemonicIdentity } from '@arkade-os/sdk';
    import { ExpoArkProvider, ExpoIndexerProvider } from '@arkade-os/sdk/adapters/expo';

    This is required for MuSig2 settlements and cryptographic operations.

    Both Wallet and ServiceWorkerWallet use a ContractManager internally to watch for virtual outputs. This provides resilient connection handling with automatic reconnection and failsafe polling - for your wallet's default address and any external contracts you register (Boltz swaps, HTLCs, etc.).

    When you call wallet.notifyIncomingFunds() or use waitForIncomingFunds(), it uses the ContractManager under the hood, giving you automatic reconnection and failsafe polling for free - no code changes needed.

    For advanced use cases, you can access the ContractManager directly to register external contracts:

    // Get the contract manager (wallet's default address is already registered)
    const manager = await wallet.getContractManager()

    // Register a VHTLC contract (e.g., for a Lightning swap)
    const contract = await manager.createContract({
      type: 'vhtlc',
      params: {
        sender: alicePubKey,
        receiver: bobPubKey,
        server: serverPubKey,
        hash: paymentHash,
        refundLocktime: '800000',
        claimDelay: '100',
        refundDelay: '102',
        refundNoReceiverDelay: '103',
      },
      script: swapScript,
      address: swapAddress,
    })

    // Listen for all contracts events (wallet address + external contracts)
    const unsubscribe = await manager.onContractEvent((event) => {
      switch (event.type) {
        case 'vtxo_received':
          console.log(`Received ${event.vtxos.length} virtual outputs to ${event.contractScript}`)
          break
        case 'vtxo_spent':
          console.log(`Spent virtual outputs from ${event.contractScript}`)
          break
      }
    })

    // Update contract data (e.g., set preimage when revealed)
    await manager.updateContractParams(contract.script, { preimage: revealedPreimage })

    // Check spendable paths (requires a specific virtual output)
    const [withVtxos] = await manager.getContractsWithVtxos({ script: contract.script })
    const vtxo = withVtxos.vtxos[0]
    const paths = manager.getSpendablePaths({
      contractScript: contract.script,
      vtxo,
      collaborative: true,
      walletPubKey: myPubKey,
    })
    if (paths.length > 0) {
      console.log('Contract is spendable via:', paths[0].leaf)
    }

    // Or list all possible paths for the current context (no spendability checks)
    const allPaths = await manager.getAllSpendingPaths({
      contractScript: contract.script,
      collaborative: true,
      walletPubKey: myPubKey,
    })

    // Fetch contracts together with their current virtual outputs
    const contractsWithVtxos = await manager.getContractsWithVtxos()

    // Force a full refresh from the indexer when needed
    await manager.refreshVtxos()

    // Stop watching
    unsubscribe()

    The watcher features:

    • Automatic reconnection with exponential backoff (1s → 30s max)
    • Failsafe polling every 60 seconds to catch missed events
    • Immediate sync on connection and after failures

    Access low-level data management through repositories:

    // Virtual output management (automatically cached for performance)
    const addr = await wallet.getAddress()
    const vtxos = await wallet.walletRepository.getVtxos(addr)
    await wallet.walletRepository.saveVtxos(addr, vtxos)

    // Contract data for SDK integrations
    await wallet.contractRepository.setContractData('my-contract', 'status', 'active')
    const status = await wallet.contractRepository.getContractData('my-contract', 'status')

    // Collection management for related data
    await wallet.contractRepository.saveToContractCollection(
      'swaps',
      { id: 'swap-1', amount: 50000, type: 'reverse' },
      'id' // key field
    )
    const swaps = await wallet.contractRepository.getContractCollection('swaps')

    For complete API documentation, visit our TypeDoc documentation.

    • pnpm - Package manager
    • nigiri - For running integration tests with a local Bitcoin regtest network

    1. Install dependencies:

      pnpm install
      pnpm format
      pnpm lint

    2. Install nigiri for integration tests:

      curl https://getnigiri.vulpem.com | bash

    # Run all tests
    pnpm test

    # Run unit tests only
    pnpm test:unit

    # Run integration tests with ark provided by nigiri
    nigiri start --ark
    pnpm test:setup # Run setup script for integration tests
    pnpm test:integration
    nigiri stop --delete

    # Run integration tests with ark provided by docker (requires nigiri)
    nigiri start
    pnpm test:up-docker
    pnpm test:setup-docker # Run setup script for integration tests
    pnpm test:integration-docker
    pnpm test:down-docker
    nigiri stop --delete

    # Watch mode for development
    pnpm test:watch

    # Run tests with coverage
    pnpm test:coverage

    # Build the TypeScript documentation
    pnpm docs:build
    # Open the docs in the browser
    pnpm docs:open

    # Release new version (will prompt for version patch, minor, major)
    pnpm release

    # You can test release process without making changes
    pnpm release:dry-run

    # Cleanup: checkout version commit and remove release branch
    pnpm release:cleanup

    MIT

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