Bitcoin protocol toolkit for Swift
Swift Objective-C Other
Switch branches/tags
Clone or download
Latest commit 92ba98d Feb 14, 2018


CI Status codecov Carthage compatible Version Platform

BitcoinKit implements Bitcoin protocol in Swift. It is an implementation of the Bitcoin SPV protocol written (almost) entirely in swift.



  • Send/receive transactions.
  • See current balance in a wallet.
  • Encoding/decoding addresses: P2PKH, WIF format.
  • Transaction building blocks: inputs, outputs, scripts.
  • EC keys and signatures.
  • BIP32, BIP44 hierarchical deterministic wallets.
  • BIP39 implementation.


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(wallet: wallet, blockStore: blockStore)

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

let peerGroup.start()



BitcoinKit is available through Carthage. To install it, simply add the following line to your Cartfile:

github "kishikawakatsumi/BitcoinKit"


BitcoinKit is available through CocoaPods. To install it, simply add the following lines to your Podfile:

pod 'BitcoinKit'


Feel free to open issues, drop us pull requests or contact us to discuss how to do things.


Twitter: @k_katsumi


BitcoinKit is available under the Apache 2.0 license. See the LICENSE file for more info.