code: function writeProviderEntry (store, cid, peer, time, callback) {
    const dsKey = [
      makeProviderKey(cid),
      '/',
      utils.encodeBase32(peer.id)
    ].join('')
  
    store.put(new Key(dsKey), Buffer.from(varint.encode(time)), callback)
  }
docs: Write a provider into the given store.
  
  @param {Datastore} store
  @param {CID} cid
  @param {PeerId} peer
  @param {number} time
  @param {function(Error)} callback
  @returns {undefined}
  
  @private