private static async Task CheckStaticPeersAsync(
            IEnumerable <BoundPeer> peers,
            RoutingTable table,
            KademliaProtocol protocol,
            CancellationToken cancellationToken)
        {
            var boundPeers = peers as BoundPeer[] ?? peers.ToArray();

            while (!cancellationToken.IsCancellationRequested)
            {
                try
                {
                    await Task.Delay(TimeSpan.FromMinutes(1), cancellationToken);

                    Log.Warning("Checking static peers. {@Peers}", boundPeers);
                    var peersToAdd = boundPeers.Where(peer => !table.Contains(peer)).ToArray();
                    if (peersToAdd.Any())
                    {
                        Log.Warning("Some of peers are not in routing table. {@Peers}", peersToAdd);
                        await protocol.AddPeersAsync(
                            peersToAdd,
                            TimeSpan.FromSeconds(5),
                            cancellationToken);
                    }
                }
                catch (OperationCanceledException e)
                {
                    Log.Warning(e, $"{nameof(CheckStaticPeersAsync)}() is cancelled.");
                    throw;
                }
                catch (Exception e)
                {
                    var msg = "Unexpected exception occurred during " +
                              $"{nameof(CheckStaticPeersAsync)}(): {{0}}";
                    Log.Warning(e, msg, e);
                }
            }
        }