Don't get me wrong, DNS Seeding is an excellent way to bootstrap via trusted nodes, I'm not trying to replace it.
What I'm trying to get rid of is the IRC bootstrapping and the hardcoded nodes in the client, they're easy targets.

BitTorrent trackers are used to handle several thousands of requests, so they would probably scale well enough. I'm not even talking about using the DHT trackers, but using old fashioned HTTP based trackers. The fact that each bitcoin client would contact the tracker would make it very hard for an attacker to get bootstrapping clients to exclusively connect to his compromised clients. I would say that using a tracker such as OpenBittorrent provides the same advantages as using an IRC channel.

On Mon, Jun 13, 2011 at 11:09 AM, Jeff Garzik <jgarzik@exmulti.com> wrote:
On Mon, Jun 13, 2011 at 4:55 AM, Christian Decker
<decker.christian@gmail.com> wrote:
> We have quite a few bootstrapping mechanisms, starting with the overly
> complex (IMHO) IRC bootstrapping, which is often suspected as bot-activity.
> Then we have a few hardcoded nodes and some fallback nodes. I was wondering
> why we didn't adopt BitTorrent tracker bootstrapping until now? It's
> basically all it does. Given a hash (SHA1 hash of the genesis bloc would be
> nice ^^) it gives you a list of other nodes with the same hash.

It seems to offer few benefits over DNS seeding, while potentially
potentially creating a vulnerable hot spot in the DHT.  Sybil attacks
on DHTs are well documented.

--
Jeff Garzik
exMULTI, Inc.
jgarzik@exmulti.com