[tor-relays] Exiting only port 8333

[Mike Hearn]

Thanks Roger, that does indeed clear things up.

For background, I maintain the bitcoinj project which is a widely used Java
Bitcoin implementation. We are planning on bundling the Orchid Tor client
and switching on Tor by default for Bitcoin wallets that are based on this
library, if we can. We'll see how it goes but if the UX impact is not too
bad then we might be adding approximately 750,000 to 1M clients after the
update fully rolls out everywhere (which would take a while). About half a
million of those are Androids that would be waking up at least every 24
hours and sometimes more frequently.

I guess we can tweak Orchid so that it uses port 8333 in the policy rather
than the exit flag for selection of its exit nodes. Should not be difficult.

I've looked at the bandwidth graphs and see that since September Tor has
been adding more bandwidth capacity than usage, and Bitcoin SPV is low
bandwidth anyway so that seems fine. Though I'm curious what happened in
September - correlated with Snowden revealing that Tor wasn't cracked yet?
But, I couldn't find any graphs of CPU capacity. Seems like the impact of
lots of Bitcoin wallets building circuits would mostly be on the CPU side
rather than the bandwidth side. Orchid supports NTor so I'm hopeful the
impact would be fairly low, perhaps even lost in the noise.

If you have any thoughts, I'd be happy to hear them.
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