Welcome to BitcoinKit

The BitcoinKit library is a Swift implementation of the Bitcoin protocol which support both BCH and BTC. Improving the mobile ecosystem for Bitcoin developers is our mission.

BitcoinKit allows maintaining a wallet, sending or receiving transactions without a full blockchain node. Following is a wallet app that demonstrates the way to use it.

Release notes are here.

Features

• Encoding/decoding addresses: base58, Cashaddr, P2PKH, P2SH, WIF format.
• Transaction building blocks: inputs, outputs, scripts.
• EC keys and signatures.
• BIP32, BIP44 hierarchical deterministic wallets.
• BIP39 implementation.
• SPV features are under construction. The following functions cannot work well sometimes.
  • Send/receive transactions.
  • See current balance in a wallet.

Usage

Generate addresses

// from Testnet Cashaddr
let cashaddrTest = try AddressFactory.create("bchtest:pr6m7j9njldwwzlg9v7v53unlr4jkmx6eyvwc0uz5t")

// from Mainnet Cashaddr
let cashaddrMain = try AddressFactory.create("bitcoincash:qpjdpjrm5zvp2al5u4uzmp36t9m0ll7gd525rss978")

// from Base58 format
let address = try AddressFactory.create("1AC4gh14wwZPULVPCdxUkgqbtPvC92PQPN")

Creating new wallet

let privateKey = PrivateKey(network: .testnet) // You can choose .mainnet or .testnet
let wallet = Wallet(privateKey: privateKey)

Import wallet from WIF

let wallet = try Wallet(wif: "92pMamV6jNyEq9pDpY4f6nBy9KpV2cfJT4L5zDUYiGqyQHJfF1K")

Hierarchical Deterministic Wallet

// Generate mnemonic
let mnemonic = try Mnemonic.generate()

// Generate seed from the mnemonic
let seed = Mnemonic.seed(mnemonic: mnemonic)

let wallet = HDWallet(seed: seed, network: .testnet)

Key derivation

let mnemonic = try Mnemonic.generate()
let seed = Mnemonic.seed(mnemonic: mnemonic)

let privateKey = HDPrivateKey(seed: seed, network: .testnet)

// m/0'
let m0prv = try! privateKey.derived(at: 0, hardened: true)

// m/0'/1
let m01prv = try! m0prv.derived(at: 1)

// m/0'/1/2'
let m012prv = try! m01prv.derived(at: 2, hardened: true)

HD Wallet Key derivation

let keychain = HDKeychain(seed: seed, network: .mainnet)
let privateKey = try! keychain.derivedKey(path: "m/44'/1'/0'/0/0")

Extended Keys

let extendedKey = privateKey.extended()

Sync blockchain

let blockStore = try! SQLiteBlockStore.default()
let blockChain = BlockChain(network: .testnet, blockStore: blockStore)

let peerGroup = PeerGroup(blockChain: blockChain)
let peerGroup.delegate = self

let peerGroup.start()

Requirements

• iOS 9.0+ / Mac OS X 10.11+ / tvOS 9.0+ / watchOS 2.0+
• Xcode 10.0+
• Swift 5.0+

Installation

CocoaPods

CocoaPods is a dependency manager for Cocoa projects. You can install it with the following command:

$ gem install cocoapods

CocoaPods 1.5.0+ is required to build BitcoinKit.

To integrate BitcoinKit into your Xcode project using CocoaPods, specify it in your Podfile:

source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '10.0'
use_frameworks!

target '<Your Target Name>' do
    pod 'BitcoinKit'
end

Then, run the following command:

$ pod install

Carthage

Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

You can install Carthage with Homebrew using the following command:

$ brew update
$ brew install carthage

To integrate BitcoinKit into your Xcode project using Carthage, specify it in your Cartfile:

github "yenom/BitcoinKit"

Run carthage update to build the framework and drag the built BitcoinKit.framework into your Xcode project.

Swift Package Manager

BitcoinKit is available through Swift Package Manager. To install it, simply add the following lines to dependencies of your Package.swift:

.package(url: "https://github.com/yenom/BitcoinKit.git", .upToNextMinor(from: "1.0.0"))

Note that following data types and features are currently not supported on Linux platform.

• Peer and PeerGroup
• SQLite based BlockStore

Contribute

Contributions to BitcoinKit are welcome and encouraged! Feel free to open issues, drop us pull requests.

Authors & Maintainers

• usatie
• akifuji

About

BitcoinKit is maintained and funded by Yenom. Visit our website or say hi on twitter (@Yenom_wallet_en)

License

BitcoinKit is available under the MIT license. See the LICENSE file for more info.

Contributors

This project exists thanks to all the people who contribute.

Backers

Thank you to all our backers! 🙏 [Become a backer]

Sponsors

Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [Become a sponsor]