code: function toProtoBuf (node) {
    const pbn = {}
  
    if (node.data && node.data.length > 0) {
      pbn.Data = node.data
    } else {
      pbn.Data = null // new Buffer(0)
    }
  
    if (node.links.length > 0) {
      pbn.Links = node.links.map((link) => {
        return {
          Hash: link.hash,
          Name: link.name,
          Tsize: link.size
        }
      })
    } else {
      pbn.Links = null
    }
  
    return pbn
  }
docs: Helper method to get a protobuf object equivalent