Bitcoin Forum

So is it possible to find ip address of a PC/Server running bitcoin-qt or bitcoind through bitcoin address?

When you make a transaction, you relay it to other peers. Someone connected to pretty much every peer will be able to mostly accurately tell who made a transaction, and that tells which IP owns which address.

It's possible to get around this, just proxy transactions or use blockchain.info's pushtx.

Alright, actually i wanted to know more about atlantis and silkroad's transaction system.
They are onion based sites, so you can't find ip address of their server,so i was wondering if they can get tracked by their bitcoin address/transactions or not.

You can run bitcoind via Tor and those website certainly do.

Alright thanks :)

There is no tie between bitcoin address and IP address. Of course, if you send a transaction from your machine without using a service to mask your true IP (TOR, proxy, whatever), people that your Bitcoin client has a direct connection with can couple the transaction to your machine.

But you could also create and sign the tx on your local machine with your own wallet / private keys and then take the signed tx to another location and transmit from there. There will be no tie at all between your machine / IP and that transaction.

There used to be a vulnerability that allowed disclosure of a peer's wallet address. Needless to say, it was quickly patched. The best you can do is blockchain.info's "relayed by", but that's terribly unreliable even if I broadcast the transaction directly from my PC.