So, Pied Piper? (In all seriousness the hyperdrives/hypercore protocol is very cool and I intend to try building my next web-builder on top of it. The OP write

So, Pied Piper? (In all seriousness the hyperdrives/hypercore protocol is very cool and I intend to try building my next web-builder on top of it. The OP writes it off too quickly: hypercore is append-only, but hyperdrives are more like bittorrent sync, which I'm very sad never took off, it worked perfectly for syncing large files between peers on a local wifi network, when google drive and dropbox were failing us)