No. No-one knows about it. I developed it a few years ago (before Nostr existed) when I designed a network that is pretty similar to Nostr. I realized that for content to properly propagate while remaining true p2p and work even in ultra hostile environments (such local adhoc meshnetworks that were being attacked (think demonstrations etc)) content needed to be filtered. When  Nostr broke through and reached escape velocity, I quit working on it. 

 I’ll add it to my list of interesting p2p protocols that I use to throw at people who decide they’re going to make a new protocol that solves everything without looking at prior art. 

I think we do need better spam filters and wot functionality in Nostr. So maybe we can apply some of what you were working on.  

 Love to hear it. Ive stopped working on it myself (don’t have time to do it any longer), but would love to see someone else at least get some inspirations and what not!