Recently I figured Kademlia is how bittorrent achieves trackerless torrents. I used bittorrent-dht[0][1] to build simple decentralised ride hailing app(was able implement POC with end to end booking). I wonder what other modern problems can be solved by this technology
[0]: https://github.com/webtorrent/bittorrent-dht
[1]: http://www.bittorrent.org/beps/bep_0005.html