Storage Adapters

Storage adapters provide persistent storage for wallet data across different platforms. For production use, always configure a persistent adapter rather than the default in-memory store.

Overview

By default, the Arkade SDK uses InMemoryStorageAdapter which stores data in memory and loses it when the application restarts. For production applications, you should use a persistent storage adapter appropriate for your environment.

Available Storage Adapters

LocalStorage

Browser/PWA persistent storage using localStorage API

IndexedDB

Browser/PWA/Service Worker advanced storage with IndexedDB

AsyncStorage

React Native persistent storage

FileSystem

Node.js file-based storage

Storage Adapter Interface

All storage adapters implement the same interface:

interface StorageAdapter {
  getItem(key: string): Promise<string | null>
  setItem(key: string, value: string): Promise<void>
  removeItem(key: string): Promise<void>
  clear(): Promise<void>
}

Browser LocalStorage

For browser applications, use LocalStorageAdapter for simple persistent storage:

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

const storage = new LocalStorageAdapter()

// Load or create identity
let mnemonic = await storage.getItem('mnemonic')
if (!mnemonic) {
  mnemonic = generateMnemonic(wordlist)
  await storage.setItem('mnemonic', mnemonic)
}

const identity = MnemonicIdentity.fromMnemonic(mnemonic)

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

Browser IndexedDB

For more advanced browser applications or service workers, use IndexedDBStorageAdapter:

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

const storage = new IndexedDBStorageAdapter('my-app', 1)

// Load identity from storage
const mnemonic = await storage.getItem('mnemonic')
const identity = MnemonicIdentity.fromMnemonic(mnemonic)

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

IndexedDB is recommended for service workers and applications that need to store large amounts of data.

React Native AsyncStorage

For React Native applications, use AsyncStorageAdapter:

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

const storage = new AsyncStorageAdapter()

// Load identity from storage
const mnemonic = await storage.getItem('mnemonic')
const identity = MnemonicIdentity.fromMnemonic(mnemonic)

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

Node.js FileSystem

For Node.js applications, use FileSystemStorageAdapter:

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

const storage = new FileSystemStorageAdapter('./wallet-data')

// Load identity from storage
const mnemonic = await storage.getItem('mnemonic')
const identity = MnemonicIdentity.fromMnemonic(mnemonic)

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

Example: Identity Management

Here’s a complete example showing how to manage identity across sessions:

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

const storage = new LocalStorageAdapter()

// Try to load existing identity
let mnemonic = await storage.getItem('mnemonic')

if (!mnemonic) {
  // Create new identity
  console.log('Creating new wallet identity...')
  mnemonic = generateMnemonic(wordlist)

  // Save to storage
  await storage.setItem('mnemonic', mnemonic)
  console.log('New identity saved to storage')
} else {
  console.log('Loaded existing identity from storage')
}

const identity = MnemonicIdentity.fromMnemonic(mnemonic)

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

const address = await wallet.getAddress()
console.log('Wallet address:', address)

Repository Pattern

The SDK also exposes repositories for low-level data management:

// VTXO 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')

Next Steps

Service Worker - Run your wallet in a background service worker
Expo/React Native - Set up Arkade in React Native applications

Getting Started

Bitcoin

Advanced Features

Overview

Available Storage Adapters

LocalStorage

IndexedDB

AsyncStorage

FileSystem

Storage Adapter Interface

Browser LocalStorage

Browser IndexedDB

React Native AsyncStorage

Node.js FileSystem

Example: Identity Management

Repository Pattern

Next Steps

​Overview

​Available Storage Adapters

LocalStorage

IndexedDB

AsyncStorage

FileSystem

​Storage Adapter Interface

​Browser LocalStorage

​Browser IndexedDB

​React Native AsyncStorage

​Node.js FileSystem

​Example: Identity Management

​Repository Pattern

​Next Steps

Overview

Available Storage Adapters

Storage Adapter Interface

Browser LocalStorage

Browser IndexedDB

React Native AsyncStorage

Node.js FileSystem

Example: Identity Management

Repository Pattern

Next Steps