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My first concern is that of peer discovery, I know by briefly looking through the code for the BitcoinJ client that it seems the general way to discover peers is by connecting to an IRC server and looking for peers in the channel list. IRC servers are vulnerable to DDoS it would be quite easy for the U.S. Government, or anyone with a botnet to launch an attack on the IRC server. I'm not sure if it is true for the official bitcoin client but the BitcoinJ client only specifies one IRC server. Is there a plan to setup a mirror service like we seen with WikiLeaks but for IRC? I guess as along as one node could be found you could potentially receive the list of peers by that node. My concern is for clients that have not discovered any nodes yet. I also seen a DNS resolution file but it was not implented yet. I know in the official client there are some IP addresses that are commented out and I suppose people could look on a site for at least one node to connect to, so maybe I answered my own question.
Second, what if someone mined Wallets instead of bitcoins? What I mean by this is that if someone created a client that continuously created send and receive wallets how long would it take before all of the addresses are used up? How would you prevent this?
