[Bitcoin-development] Abnormally Large Tor node accepting only Bitcoin traffic

Mike Hearn mike at plan99.net
Mon Jul 28 10:16:16 UTC 2014

> As I pointed out above, — it isn't really.  Without the exit flag, I
> believe no tor node will select it to exit 8333 unless manually
> configured. (someone following tor more closely than I could correct
> if I'm wrong here)

The "exit" flag doesn't mean what you would expect it to mean. The reason
such a node won't get much traffic is that Tor speculatively builds
circuits at startup on the assumption they'll be used for web browsing.
Thus if you don't exit web traffic you won't get much in the way of traffic
at least not until bitcoinj based wallets start shipping Tor mode.

There's a perfectly reasonable explanation for why someone would run such a
node. In fact I run a Tor exit that only allows port 8333 too: it's a way
to contribute exit bandwidth without much risk of getting raided by the

Occam's razor and all ....
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