How to use the bitcore-lib.BlockHeader function in bitcore-lib

test('blockchain queries', function (t) {
  var genesis = new bitcore.BlockHeader({
    version: 1,
    prevHash: constants.zeroHash,
    merkleRoot: constants.zeroHash,
    time: Math.floor(Date.now() / 1000),
    bits: u.toCompactTarget(maxTarget),
    nonce: 0
  })
  var chain = new Blockchain({
    path: storePath,
    maxTarget: maxTarget,
    genesis: genesis
  })

  var headers = []
  t.test('setup', function (t) {
    var block = genesis

function createBlock () {
  var header = new bitcore.BlockHeader({
    version: 1,
    prevHash: u.toHash('0000000000000000000000000000000000000000000000000000000000000000'),
    merkleRoot: u.toHash('4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b'),
    time: Math.floor(Date.now() / 1000),
    bits: 0x1d00ffff,
    nonce: Math.floor(Math.random() * 0xffffff)
  })
  return { height: Math.floor(Math.random() * 400000), header: header }
}

function createBlock (prev, nonce, bits) {
  var i = nonce || 0
  var header
  do {
    header = new bitcore.BlockHeader({
      version: 1,
      prevHash: prev ? u.toHash(prev.hash) : constants.zeroHash,
      merkleRoot: constants.zeroHash,
      time: prev ? (prev.time + 1) : Math.floor(Date.now() / 1000),
      bits: bits || (prev ? prev.bits : u.toCompactTarget(maxTarget)),
      nonce: i++
    })
  } while (!header.validProofOfWork())
  return header
}

var bitcore = require('bitcore-lib')
var BN = bitcore.crypto.BN
var u = require('./utils.js')

module.exports = {
  genesisHeaders: {
    livenet: new bitcore.BlockHeader({
      version: 1,
      prevHash: u.toHash('0000000000000000000000000000000000000000000000000000000000000000'),
      merkleRoot: u.toHash('4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b'),
      time: 1231006505,
      bits: 0x1d00ffff,
      nonce: 2083236893
    }),
    testnet: new bitcore.BlockHeader({
      version: 1,
      prevHash: u.toHash('0000000000000000000000000000000000000000000000000000000000000000'),
      merkleRoot: u.toHash('4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b'),
      time: 1296688602,
      bits: 0x1d00ffff,
      nonce: 414098458
    })
  },

},
  checkpoints: {
    livenet: {
      height: 359000,
      header: new bitcore.BlockHeader({
        version: 3,
        prevHash: u.toHash('000000000000000006ecee94daaa034bbd026cad52a9d3c6a5b7972716e5d566'),
        merkleRoot: u.toHash('1e24b829d04e8e6fcb71fa0de364d6c0fa952c1cdb5fad446cf2a94dd203867a'),
        time: 1433195458,
        bits: 0x18171a8b,
        nonce: 3020402664
      })
    },
    testnet: {
      height: 446000,
      header: new bitcore.BlockHeader({
        version: 3,
        prevHash: u.toHash('00000000003d7bfe7baf59981a749017112b8018f0977356a3a21ea81a04d79d'),
        merkleRoot: u.toHash('8a5829f9ac43b54819a02e44b2754458179de46c748f2d110bf97a0b02595267'),
        time: 1432987428,
        bits: 0x1a3fffc0,
        nonce: 3771678460
      })
    }
  },
  maxTarget: new BN('ffff0000000000000000000000000000000000000000000000000000', 'hex'),
  zeroHash: new Buffer('0000000000000000000000000000000000000000000000000000000000000000', 'hex'),
  timestampThreshold: 500000000,

  webSeeds: [
    '104.236.185.38:8192',
    'paul-kernfeld-peerhub.herokuapp.com'

var bitcore = require('bitcore-lib')
var BN = bitcore.crypto.BN
var u = require('./utils.js')

module.exports = {
  genesisHeaders: {
    livenet: new bitcore.BlockHeader({
      version: 1,
      prevHash: u.toHash('0000000000000000000000000000000000000000000000000000000000000000'),
      merkleRoot: u.toHash('4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b'),
      time: 1231006505,
      bits: 0x1d00ffff,
      nonce: 2083236893
    }),
    testnet: new bitcore.BlockHeader({
      version: 1,
      prevHash: u.toHash('0000000000000000000000000000000000000000000000000000000000000000'),
      merkleRoot: u.toHash('4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b'),
      time: 1296688602,
      bits: 0x1d00ffff,
      nonce: 414098458
    })
  },
  checkpoints: {
    livenet: {
      height: 359000,
      header: new bitcore.BlockHeader({
        version: 3,
        prevHash: u.toHash('000000000000000006ecee94daaa034bbd026cad52a9d3c6a5b7972716e5d566'),
        merkleRoot: u.toHash('1e24b829d04e8e6fcb71fa0de364d6c0fa952c1cdb5fad446cf2a94dd203867a'),
        time: 1433195458,