entangled looks promising, but appears to have been abandoned.  SF doesn't have code, but did find:
https://github.com/nandajavarma/entangled

Appears to be using an older version of twisted.

DHT:
https://www.bittorrent.org/beps/bep_0005.html

btdht looks like a great option.
https://btdht.readthedocs.io/en/latest/README.html

Design for using bep44 and bep46.
https://www.bittorrent.org/beps/bep_0044.html
https://www.bittorrent.org/beps/bep_0046.html

for what I need, bep44 isn't enough for me, need to "register" that a key applies to the hash...

idea: user needs to look up where a hash came from.  does a query for the hash of the file, and gets back a list of keys.
the key + the hash of the file as the salt gives you the torrent of the metadata that the person is publishing for info about that hash..

Publish data on a file:

Looking up file:
1. hash file
2. dht query_keys request:
	{ 'y': 'q',
	'q': 'query_keys',
	't': <txid>,
	'a': { 'h': <self-identifying hash> }
	}

   response:
	{ 'y': 'r',
	't': <txid>,
	'r': { 'k': [ <list of p255 keys> ] }
	}

So, there needs to be another add_array(infohash, key) or something similar.

BEP46 is interesting for FreeBSD, there can be a salt for each branch (stable/head), which gets updated
to point to the latest release of each.  Or even snapshots.  This can be done to always get the latest
release of FreeBSD

https://github.com/webtorrent/webtorrent/issues/886

Python 3 only
https://github.com/bmuller/kademlia

https://github.com/isaaczafuta/pydht