function checksumToArray(checksum) {
  var result = [];
  for (var i = 0; i < 8; ++i) {
    result.push(checksum & 31);
    checksum /= 32;
  }
  return result.reverse();
}
Returns an array representation of the given checksum to be encoded
within the address' payload.

@param {number} checksum Computed checksum.