$ git clone https://github.com/qtumproject/qtum-ipfs.git
$ cd qtum-ipfs
$ npm install

// configuration in file src/App.js for a public node of Infura
ipfsApi = ipfsAPI('ipfs.infura.io', '5001', {protocol: 'https'})

// command to start a local IPFS node and set up CORS
$ ipfs daemon
$ ipfs config --json API.HTTPHeaders.Access-Control-Allow-Origin "[\"*\"]"
$ ipfs config --json API.HTTPHeaders.Access-Control-Allow-Credentials "[\"true\"]"
// configuration in file src/App.js for a local node
ipfsApi = ipfsAPI('localhost', '5001', {protocol: 'http'})

// start a Qtum QT node on Mac with RPC parameters specified
$ /Applications/Qtum-Qt.app/Contents/MacOS/Qtum-Qt -testnet -server -rpcuser=atx -rpcpassword=atx -rpcport=13889

// start a CORS proxy
$ npm install -g local-cors-proxy
$ lcp --proxyUrl http://localhost:13889  --proxyPartial "" --port 8010

// configuration in file src/App.js
contract = (new Qtum('http://atx:[email protected]:8010', repo)).contract('IpfsRecord.sol')

// command for deploying the smart contract, generating a file named solar.development.json
$ cd src
$ solar deploy IpfsRecord.sol --qtum_rpc="http://atx:[email protected]:13889/"

// configuration in file src/App.js
import repo from './solar.development.json'

// in file solar.development.json
{
  "contracts": {
    "IpfsRecord.sol": {
      "source": "IpfsRecord.sol:IpfsRecord",
      "abi": ...,
      "bin": ...,
      "binhash": "3192a61fb90d58e13313cbcad551892014f423c637b9633ef42c9d3c56610e54",
      "name": "IpfsRecord",
      "deployName": "IpfsRecord.sol",
      "address": "a5cbd6eaa89b349d13ce24331406a89d04e9d90a",
      "txid": "b97a8a562b3fb6aeab9d4b023025182141092bb41dcb3955aecf27ffc82eb30d",
      "createdAt": "2018-11-15T10:31:23.43932943+08:00",
      "confirmed": true,
      "sender": "qWE1ZZEs7yxoEGzdLVZnNqsmuLPSThi4d6",
      "senderHex": "8aefb4b0ff32c65e9dc4d8036cd6cec0b4c7fe9f"
    }
  },
  "libraries": {},
  "related": {}
}

$ cd ..
$ npm start