Blockchain would be silly, there's no need for a globally-consistent view just to have search. Distributed search has been around for some time, e.g. eMule use

Blockchain would be silly, there's no need for a globally-consistent view just to have search. Distributed search has been around for some time, e.g. eMule uses Kad[1], Tribler[2] has a solution based on Tor, but the most appropriate here is probably YaCy[3]. Of course, all of those are technically "hosted", insofar as p2p involves peers acting as servers. But I bet someone has made a f2f[4] version, meaning you'd only serve to a few, hopefully trusted peers. [1] https://en.wikipedia.org/wiki/Kademlia https://en.wikipedia.org/wiki/Kademlia [2] https://www.tribler.org/ https://www.tribler.org/ [3] https://yacy.net/ https://yacy.net/ [4] https://en.wikipedia.org/wiki/Friend-to-friend https://en.wikipedia.org/wiki/Friend-to-friend