don't self-host this sort of thing publicly, even if you don't register it it will be found, use an encrypted leaseset

similar to tor exit node, http://zzzmirror.i2p/topics/3254 is a good read

tl;dr tinyproxy or 3proxy (there are others), haproxy could be used for load balance, privoxy not be good with lots of connections, zero hops allow for more multihomes and more speed/less latency

acetone is 1 hop, stormycloud and purokishi are both zero hop ( i think)