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Moved to https://github.com/swaponline/MultiCurrencyWallet/blob/master/docs/CORE.md

Swap Core

In-browser atomic swap protocol based on HTLC

Try demo at https://swaponline.io/#/exchange

THIS IS ALPHA VERSION AND CAN BE CHANGED SIGNIFICANTLY

Swap Core is a decentralized exchange protocol (DEP) for crosschain atomic swaps, based on HTLC. It is written on JavaScript and can be run in browser or via NodeJS.

tags: HTLC, atomic swap, javascript, browser, crypto, bitcoin, ethereum, erc20

Used currencies

ticker title
ETH Ethereum
* (ERC20) ERC20 tokens (USDT, ...)
BTC Bitcoin
BCH Bitcoin Cash
GHOST Ghost
SUM Sumcoin
NEXT NEXT.coin

Current swap directions support

tx\rx ETH ERC20 BTC BCH GHOST SUM NEXT
ETH + + soon
ERC20 + +
BTC + +
BCH
GHOST + +
SUM
NEXT soon soon soon

How it works step by step

deprecated

Alice persist Alice BTC -> ETH Bob ETH -> BTC Bob persist
EthContract.checkSign() 1) Wait for sign 1) Sign
2) Create secret hash 2) Wait for BTC script BtcSwap.checkBalance()
3) Check balance (if not enough wait until user fill balance on this step)
4) Create BTC script
5) Fund BTC script
EthSwap.checkBalance() 6) Wait for ETH contract 3) Verify BTC script
4) Check balance (if not enough wait until user fill balance on this step)
5) Create ETH contract
7) Withdraw from ETH contract 6) Wait for withdraw from ETH contract EthSwap.getSecret()
7) Withdraw from BTC script

Usage

Simplest config:

import Web3 from 'web3'
import bitcoin from 'bitcoinjs-lib'

import swapApp, { constants } from 'swap.app'
import SwapAuth from 'swap.auth'
import SwapRoom from 'swap.room'
import SwapOrders from 'swap.orders'
import { EthSwap, EthTokenSwap, BtcSwap } from 'swap.swaps'
import { ETH2BTC, BTC2ETH, ETHTOKEN2BTC, BTC2ETHTOKEN } from 'swap.flows'


const web3 = new Web3(new Web3.providers.HttpProvider('https://rinkeby.infura.io/<YOUR_KEY>'))

SwapApp.setup({
  network: 'testnet',

  env: {
    web3,
    bitcoin,
    Ipfs: window.Ipfs,
    IpfsRoom: window.IpfsRoom,
    storage: window.localStorage,
  },

  services: [
    new SwapAuth({
      eth: null,
      btc: null,
    }),
    new SwapRoom({
      EXPERIMENTAL: {
        pubsub: true,
      },
      config: {
        Addresses: {
          Swarm: [
            '/dns4/ws-star.discovery.libp2p.io/tcp/443/wss/p2p-websocket-star',
          ],
        },
      },
    }),
    new SwapOrders(),
  ],

  swaps: [
    new EthSwap({
      address: '0xe08907e0e010a339646de2cc56926994f58c4db2',
      abi: [ { "constant": false, "inputs": [ { "name": "_ownerAddress", "type": "address" } ], "name": "abort", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_participantAddress", "type": "address" } ], "name": "close", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_secretHash", "type": "bytes20" }, { "name": "_participantAddress", "type": "address" } ], "name": "createSwap", "outputs": [], "payable": true, "stateMutability": "payable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_participantAddress", "type": "address" } ], "name": "refund", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_ratingContractAddress", "type": "address" } ], "name": "setReputationAddress", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_participantAddress", "type": "address" } ], "name": "sign", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "inputs": [], "payable": false, "stateMutability": "nonpayable", "type": "constructor" }, { "constant": false, "inputs": [ { "name": "_secret", "type": "bytes32" }, { "name": "_ownerAddress", "type": "address" } ], "name": "withdraw", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [ { "name": "_ownerAddress", "type": "address" } ], "name": "checkSign", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "name": "_ownerAddress", "type": "address" }, { "name": "_participantAddress", "type": "address" } ], "name": "getInfo", "outputs": [ { "name": "", "type": "bytes32" }, { "name": "", "type": "bytes20" }, { "name": "", "type": "uint256" }, { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "name": "_participantAddress", "type": "address" } ], "name": "getSecret", "outputs": [ { "name": "", "type": "bytes32" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "owner", "outputs": [ { "name": "", "type": "address" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "name": "", "type": "address" }, { "name": "", "type": "address" } ], "name": "participantSigns", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "ratingContractAddress", "outputs": [ { "name": "", "type": "address" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "name": "", "type": "address" }, { "name": "", "type": "address" } ], "name": "swaps", "outputs": [ { "name": "secret", "type": "bytes32" }, { "name": "secretHash", "type": "bytes20" }, { "name": "createdAt", "type": "uint256" }, { "name": "balance", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "name": "_ownerAddress", "type": "address" }, { "name": "_participantAddress", "type": "address" } ], "name": "unsafeGetSecret", "outputs": [ { "name": "", "type": "bytes32" } ], "payable": false, "stateMutability": "view", "type": "function" } ],
      fetchBalance: (address) => request.fetchEthBalance(address),
    }),
    new BtcSwap({
      fetchBalance: (address) => request.fetchBtcBalance(address),
      fetchUnspents: (scriptAddress) => request.fetchBtcUnspents(scriptAddress),
      broadcastTx: (txRaw) => request.broadcastBtcTx(txRaw),
    }),
    new EthTokenSwap({
      name: constants.COINS.noxon,
      address: '0xBA5c6DC3CAcdE8EA754e47c817846f771944518F',
      abi: [{"constant":false,"inputs":[{"name":"_secret","type":"bytes32"},{"name":"_ownerAddress","type":"address"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"getSecret","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_ratingContractAddress","type":"address"}],"name":"setReputationAddress","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"participantSigns","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_ownerAddress","type":"address"}],"name":"abort","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"swaps","outputs":[{"name":"token","type":"address"},{"name":"secret","type":"bytes32"},{"name":"secretHash","type":"bytes20"},{"name":"createdAt","type":"uint256"},{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_secretHash","type":"bytes20"},{"name":"_participantAddress","type":"address"},{"name":"_value","type":"uint256"},{"name":"_token","type":"address"}],"name":"createSwap","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_ownerAddress","type":"address"}],"name":"checkSign","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"close","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"ratingContractAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"sign","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_ownerAddress","type":"address"}],"name":"getBalance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"refund","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[],"name":"Sign","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"createdAt","type":"uint256"}],"name":"CreateSwap","type":"event"},{"anonymous":false,"inputs":[],"name":"Withdraw","type":"event"},{"anonymous":false,"inputs":[],"name":"Close","type":"event"},{"anonymous":false,"inputs":[],"name":"Refund","type":"event"},{"anonymous":false,"inputs":[],"name":"Abort","type":"event"}],
      tokenAddress: '0x60c205722c6c797c725a996cf9cca11291f90749',
      tokenAbi: [{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_amount","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"getBurnPrice","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"manager","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"unlockEmission","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"emissionlocked","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"acceptOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"lockEmission","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"burnAll","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_newManager","type":"address"}],"name":"changeManager","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_newOwner","type":"address"}],"name":"changeOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"emissionPrice","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"addToReserve","outputs":[{"name":"","type":"bool"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[],"name":"burnPrice","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"tokenAddress","type":"address"},{"name":"amount","type":"uint256"}],"name":"transferAnyERC20Token","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"NoxonInit","outputs":[{"name":"","type":"bool"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[],"name":"acceptManagership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"buyer","type":"address"},{"indexed":false,"name":"ethers","type":"uint256"},{"indexed":false,"name":"_emissionedPrice","type":"uint256"},{"indexed":false,"name":"amountOfTokens","type":"uint256"}],"name":"TokenBought","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"buyer","type":"address"},{"indexed":false,"name":"ethers","type":"uint256"},{"indexed":false,"name":"_burnedPrice","type":"uint256"},{"indexed":false,"name":"amountOfTokens","type":"uint256"}],"name":"TokenBurned","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"etherReserved","type":"uint256"}],"name":"EtherReserved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_spender","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Approval","type":"event"}],
      fetchBalance: (address) => ethereumInstance.fetchTokenBalance(address),
    }),
    new EthTokenSwap({
      name: constants.COINS.swap,
      address: '0xBA5c6DC3CAcdE8EA754e47c817846f771944518F',
      abi: [{"constant":false,"inputs":[{"name":"_secret","type":"bytes32"},{"name":"_ownerAddress","type":"address"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"getSecret","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_ratingContractAddress","type":"address"}],"name":"setReputationAddress","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"participantSigns","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_ownerAddress","type":"address"}],"name":"abort","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"swaps","outputs":[{"name":"token","type":"address"},{"name":"secret","type":"bytes32"},{"name":"secretHash","type":"bytes20"},{"name":"createdAt","type":"uint256"},{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_secretHash","type":"bytes20"},{"name":"_participantAddress","type":"address"},{"name":"_value","type":"uint256"},{"name":"_token","type":"address"}],"name":"createSwap","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_ownerAddress","type":"address"}],"name":"checkSign","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"close","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"ratingContractAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"sign","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_ownerAddress","type":"address"}],"name":"getBalance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"refund","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[],"name":"Sign","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"createdAt","type":"uint256"}],"name":"CreateSwap","type":"event"},{"anonymous":false,"inputs":[],"name":"Withdraw","type":"event"},{"anonymous":false,"inputs":[],"name":"Close","type":"event"},{"anonymous":false,"inputs":[],"name":"Refund","type":"event"},{"anonymous":false,"inputs":[],"name":"Abort","type":"event"}],
      tokenAddress: '0x60c205722c6c797c725a996cf9cca11291f90749',
      tokenAbi: [{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_amount","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"getBurnPrice","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"manager","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"unlockEmission","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"emissionlocked","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"acceptOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"lockEmission","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"burnAll","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_newManager","type":"address"}],"name":"changeManager","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_newOwner","type":"address"}],"name":"changeOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"emissionPrice","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"addToReserve","outputs":[{"name":"","type":"bool"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[],"name":"burnPrice","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"tokenAddress","type":"address"},{"name":"amount","type":"uint256"}],"name":"transferAnyERC20Token","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"NoxonInit","outputs":[{"name":"","type":"bool"}],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[],"name":"acceptManagership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"buyer","type":"address"},{"indexed":false,"name":"ethers","type":"uint256"},{"indexed":false,"name":"_emissionedPrice","type":"uint256"},{"indexed":false,"name":"amountOfTokens","type":"uint256"}],"name":"TokenBought","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"buyer","type":"address"},{"indexed":false,"name":"ethers","type":"uint256"},{"indexed":false,"name":"_burnedPrice","type":"uint256"},{"indexed":false,"name":"amountOfTokens","type":"uint256"}],"name":"TokenBurned","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"etherReserved","type":"uint256"}],"name":"EtherReserved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_spender","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Approval","type":"event"}],
      fetchBalance: (address) => ethereumInstance.fetchTokenBalance(address),
    }),
  ],

  flows: [
    ETH2BTC,
    BTC2ETH,
    ETHTOKEN2BTC(constants.COINS.noxon),
    BTC2ETHTOKEN(constants.COINS.noxon),
  ],
})
import SwapApp, { constants } from 'swap.app'


SwapApp.services.orders.create({
  buyCurrency: constants.COINS.eth,
  sellCurrency: constants.COINS.btc,
  buyAmount: 10,
  sellAmount: 1,
})

SwapApp.services.orders.getMyOrders() returns

[
  {
    id: '...',
  }
]

[swap.app] SwapApp

SwapApp is singleton!

Configure params

Option Value Description
network 'mainnet' or 'testnet' (default)
env Map of environments Environment for API. Available env names: web3, bitcoin, Ipfs (required), IpfsRoom (required), storage (default: window.localStorage) Usage SwapApp.env.{envName}
services Array of service instances Usage SwapApp.services.{serviceName}
swaps Array of swap instances All standard swaps stored in swap.swaps package
flows Array of flow classes All standard flows stored in swap.flows package

Public props

Prop name Description
network
env
services
swaps
flows

Public methods

Method Description
isMainNet() Returns true if SwapApp.network === 'mainnet'
isTestNet() Returns true if SwapApp.network === 'testnet'

* SwapApp Services

Each service class should extend swap.app/ServiceInterface

class ServiceInterface {

  // _constructor for aggregation
  _constructor() {
    // service name, within it will be stored in SwapApp.services
    this._serviceName     = null
    this._dependsOn       = []
    this._spyHandlers     = []
  }

  constructor() {
    this._constructor()
  }

  _waitRelationsResolve() {
    if (this._dependsOn && this._dependsOn.length) {
      const dependsOnMap = {}

      this._dependsOn.forEach((Service) => {
        dependsOnMap[Service.name] = {
          initialized: false,
        }
        SwapApp.services[Service.name]._addWaitRelationHandler(() => {
          this._dependsOn[Service.name].initialized = true

          const areAllExpectsInitialized = Object.keys(this._dependsOn).every((serviceName) => (
            this._dependsOn[serviceName].initialized
          ))

          if (areAllExpectsInitialized) {
            this.initService()
          }
        })
      })

      this._dependsOn = dependsOnMap
    }
  }

  _addWaitRelationHandler(handler) {
    this._spyHandlers.push(handler)
  }

  _tryInitService() {
    if (!this._dependsOn) {
      this.initService()
      this._spyHandlers.forEach((handler) => handler())
      this._spyHandlers = []
    }
  }

  initService() {
    // init service on SwapApp mounting
  }
}

This interface allows services to be mounted in right order (to not care of services position in setup array). For example swap.orders depends on swap.room, so it must wait until swap.room be mounted in SwapApp.services.

[swap.auth] SwapApp.services.auth

The service for authentication and storing auth data. Currently contains:

  • bch
  • btc
  • eth
  • ghost
  • sum
new SwapAuth({
  eth: null,
  btc: null,
  ...
})

You can pass null or private key as value. If null passed new private key will be created, this key will be saved in SwapApp.env.storage by key {network}:{coinName}:privateKey - for network: testnet and coin eth it will be testnet:eth:privateKey

Public props

Prop name Description
accounts

Public methods

Method Description
getPublicData() Returns { address, publicKey } for each coin passed on initialization

* Extension

To extend auth service with new coins need to create new file with coin name (use eth.js / btc.js as example) and add coin name to swap.app/constants/COINS.js

[swap.room] SwapApp.services.room

Wrapper over ipfs-pubsub-room package. This service provides a room based on an IPFS pub-sub channel. Emits membership events, listens for messages, broadcast and direct messages to peers. Sends events about new orders, orders status change, swap state changes between two users, etc.

Only one argument available - config:

{
  EXPERIMENTAL: {
    pubsub: true,
  },
  config: {
    Addresses: {
      Swarm: [
        '/dns4/ws-star.discovery.libp2p.io/tcp/443/wss/p2p-websocket-star',
      ],
    },
  },
}

Public props

Prop name Description
peer Current user peer

Public methods

Method name Description
on(eventName, handler)
off(eventName, handler)
once(eventName, handler) Call handler once and unsubscribe 
sendMessage([
  {
    event: 'new order',
    data: {
      order,
    },
  },
  ...
])
Accepts array of messages

[swap.orders] SwapApp.services.orders

Provides the workflow with orders - create, store, update, remove orders.

Public methods

Method Description 
create({
  buyCurrency: 'ETH',
  sellCurrency: 'BTC',
  buyAmount: 10,
  sellAmount: 1,
  exchangeRate: 0.1,
})
Order entity allows to contain only certain props: buyCurrency, sellCurrency, buyAmount, sellAmount, exchangeRate
remove(orderId)
getMyOrders() Get all my orders
getPeerOrders(peer) Get all user's orders by his peer. If user offline returns [ ]
on(eventName, handler) Subscribe for event
off(eventName, handler) Unsubscribe

Events

Event name Description
new orders Other user becomes online and send all his orders to other peers
new order Other user creates an order
remove order Other user removes an order

[swap.swaps]

This package contains set of classes which provide functionality for swap operations: deposit funds, check balance, withdraw, refund, abort swap, etc. Each file (class) written for specific blockchain (EthSwap, BtcSwap) / coin (EthTokenSwap). These classes used inside Swap process by swap.flows, developer needs only to pass necessary class to SwapApp setup config:

swapApp.setup({
  ...
  swaps: [
    new EthSwap({
      address: '0xdbC2395f753968a93465487022B0e5D8730633Ec',
      abi: [{"constant":false,"inputs":[{"name":"_secret","type":"bytes32"},{"name":"_ownerAddress","type":"address"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"getSecret","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_ratingContractAddress","type":"address"}],"name":"setReputationAddress","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"participantSigns","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_ownerAddress","type":"address"}],"name":"abort","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"swaps","outputs":[{"name":"secret","type":"bytes32"},{"name":"secretHash","type":"bytes20"},{"name":"createdAt","type":"uint256"},{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_secretHash","type":"bytes20"},{"name":"_participantAddress","type":"address"}],"name":"createSwap","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"name":"_ownerAddress","type":"address"}],"name":"checkSign","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"close","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"ratingContractAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"sign","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_ownerAddress","type":"address"}],"name":"getBalance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_participantAddress","type":"address"}],"name":"refund","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[],"name":"Sign","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"createdAt","type":"uint256"}],"name":"CreateSwap","type":"event"},{"anonymous":false,"inputs":[],"name":"Withdraw","type":"event"},{"anonymous":false,"inputs":[],"name":"Close","type":"event"},{"anonymous":false,"inputs":[],"name":"Refund","type":"event"},{"anonymous":false,"inputs":[],"name":"Abort","type":"event"}],
      fetchBalance: (address) => ethereumInstance.fetchBalance(address),
    }),
    new BtcSwap({
      fetchBalance: (address) => bitcoinInstance.fetchBalance(address),
      fetchUnspents: (scriptAddress) => bitcoinInstance.fetchUnspents(scriptAddress),
      broadcastTx: (txRaw) => bitcoinInstance.broadcastTx(txRaw),
    }),
    ...
  ],
  ...
})

Each *Swap should extends swap.app/SwapInterface:

class SwapInterface {

  constructor() {
    // service name, within it will be stored in SwapApp.swaps
    this._swapName = null
  }

  _initSwap() {
    // init service on SwapApp mounting
  }
}
  • this._swapName required by SwapApp setup process, within it will be stored in SwapApp.swaps[_swapName]
  • _initSwap() will be called when swap be mounted

BtcSwap

Public methods 
/**
 *
 * @param {object} data
 * @param {string} data.secretHash
 * @param {string} data.ownerPublicKey
 * @param {string} data.recipientPublicKey
 * @param {number} data.lockTime
 * @returns {{scriptAddress: *, script: (*|{ignored})}}
 */
createScript(data)

/**
 *
 * @param {object} data
 * @param {string} data.recipientPublicKey
 * @param {number} data.lockTime
 * @param {object} expected
 * @param {number} expected.value
 * @param {number} expected.lockTime
 * @param {string} expected.recipientPublicKey
 * @returns {Promise.<string>}
 */
checkScript(data, expected)

/**
 *
 * @param {object} data
 * @param {object} data.scriptValues
 * @param {BigNumber} data.amount
 * @param {function} handleTransactionHash
 * @returns {Promise}
 */
fundScript(data, handleTransactionHash)

/**
 *
 * @param {object|string} data - scriptValues or wallet address
 * @returns {Promise.<void>}
 */
getBalance(data)

/**
 *
 * @param {object} data
 * @param {object} data.scriptValues
 * @param {string} data.secret
 * @param {boolean} isRefund
 * @returns {Promise}
 */
getWithdrawRawTransaction(data, isRefund)

/**
 *
 * @param {object} data
 * @param {object} data.scriptValues
 * @param {string} data.secret
 * @param {boolean} isRefund
 * @returns {Promise}
 */
getWithdrawHexTransaction(data, isRefund)

/**
 *
 * @param {object} data
 * @param {object} data.scriptValues
 * @param {string} data.secret
 * @returns {Promise}
 */
getRefundRawTransaction(data)

/**
 *
 * @param {object} data
 * @param {object} data.scriptValues
 * @param {string} data.secret
 * @returns {Promise}
 */
getRefundHexTransaction(data)

/**
 *
 * @param {object} data
 * @param {object} data.scriptValues
 * @param {string} data.secret
 * @param {function} handleTransactionHash
 * @param {boolean} isRefund
 * @returns {Promise}
 */
withdraw(data, handleTransactionHash, isRefund)

/**
 *
 * @param {object} data
 * @param {object} data.scriptValues
 * @param {string} data.secret
 * @param {function} handleTransactionHash
 * @returns {Promise}
 */
refund(data, handleTransactionHash)

EthSwap

Public methods 
/**
 *
 * @param {object} data
 * @param {string} data.participantAddress
 * @param {function} handleTransactionHash
 * @returns {Promise}
 */
sign(data, handleTransactionHash)

/**
 *
 * @param {object} data
 * @param {string} data.secretHash
 * @param {string} data.participantAddress
 * @param {number} data.amount
 * @param {function} handleTransactionHash
 * @returns {Promise}
 */
create(data, handleTransactionHash)

/**
 *
 * @param {object} data
 * @param {string} data.ownerAddress
 * @returns {Promise}
 */
getBalance(data)

/**
 *
 * @param {object} data
 * @param {string} data.ownerAddress
 * @param {BigNumber} data.expectedValue
 * @returns {Promise.<string>}
 */
checkBalance(data)

/**
 *
 * @param {object} data
 * @param {string} data.secret
 * @param {string} data.ownerAddress
 * @param {function} handleTransactionHash
 * @returns {Promise}
 */
withdraw(data, handleTransactionHash)

/**
 *
 * @param {object} data
 * @param {string} data.participantAddress
 * @param {function} handleTransactionHash
 * @returns {Promise}
 */
refund(data, handleTransactionHash)

/**
 *
 * @param {object} data
 * @param {string} data.participantAddress
 * @returns {Promise}
 */
getSecret(data)

/**
 *
 * @param {object} data
 * @param {string} data.participantAddress
 * @param handleTransactionHash
 * @returns {Promise}
 */
close(data, handleTransactionHash)

EthTokenSwap

Public methods 
/**
 *
 * @param {object} data
 * @param {string} data.participantAddress
 * @param {function} handleTransactionHash
 * @returns {Promise}
 */
sign(data, handleTransactionHash)

/**
 *
 * @param {object} data
 * @param {BigNumber} data.amount
 * @param {function} handleTransactionHash
 * @returns {Promise}
 */
approve(data, handleTransactionHash)

/**
 *
 * @param {object} data
 * @param {string} data.owner
 * @param {string} data.spender
 * @returns {Promise}
 */
checkAllowance(data)

/**
 *
 * @param {object} data
 * @param {string} data.secretHash
 * @param {string} data.participantAddress
 * @param {BigNumber} data.amount
 * @param {function} handleTransactionHash
 * @returns {Promise}
 */
create(data, handleTransactionHash)

/**
 *
 * @param {object} data
 * @param {string} data.ownerAddress
 * @returns {Promise}
 */
getBalance(data)

/**
 *
 * @param {object} data
 * @param {string} data.ownerAddress
 * @param {BigNumber} data.expectedValue
 * @returns {Promise.<string>}
 */
checkBalance(data)

/**
 *
 * @param {object} data
 * @param {string} data.secret
 * @param {string} data.ownerAddress
 * @param {function} handleTransactionHash
 * @returns {Promise}
 */
withdraw(data, handleTransactionHash)

/**
 *
 * @param {object} data
 * @param {string} data.participantAddress
 * @param {function} handleTransactionHash
 * @returns {Promise}
 */
refund(data, handleTransactionHash)

/**
 *
 * @param {object} data
 * @param {string} data.participantAddress
 * @returns {Promise}
 */
getSecret(data)

/**
 *
 * @param {object} data
 * @param {string} data.participantAddress
 * @param handleTransactionHash
 * @returns {Promise}
 */
close(data, handleTransactionHash)

[swap.flows]

This package contains set of classes which describe how swaps will be processed step by step.

BTC2ETH

Requires: BtcSwap, EthSwap

ETH2BTC

Requires: BtcSwap, EthSwap

BTC2ETHTOKEN

* Note this is class factory

Requires: BtcSwap, EthTokenSwap

ETHTOKEN2BTC

* Note this is class factory

Requires: BtcSwap, EthTokenSwap

[swap.swap]

###WILL_BE_SOON

Examples

Usage examples are located in examples directory.

React

cd ./examples/react
npm i
npm start

Vanilla

Still not working

Your app

There are couple of ways to use swap.core packages in your app:

  1. Copy whole src/ to your own app folder and use relative paths... a lot of pain

  2. Use app-module-path-node to resolve module paths

  3. Webpack - to resolve swap packages use aliases

resolve: {
  alias: {
    'swap.app': '<PATH_TO_SWAP.CORE>/src/swap.app',
    'swap.auth': '<PATH_TO_SWAP.CORE>/src/swap.auth',
    ...
  }
}

About

Decentralized JS library for secure crosschain swaps. BTC<>ETH/ERC20, orderbook on libp2p (included in swap.react)

swap.online

Topics

javascript browser crypto lightning bitcoin atomic ethereum ipfs cryptocurrency exchange swap litecoin erc20 payment-channel nimiq htlc p2sh atomic-swap

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