I would just like to point out that there have been several SSH attacks against my computer today that seem to be specifically targeting Bitcoin users. I believe the target IPs to be scraped from the Bitcoin network itself. I received about 100 login attempts to accounts called "bitcoin", "bitcoin1", "bitcoin2" and "namecoin" from an IP in China (220.165.5.4). If anyone knows what particular Bitcoin client or setup these attacks are targeting it would be useful to know, otherwise I would just like to remind everyone to keep their SSH secure, ideally with the AllowUsers directive to allow only specific accounts SSH access.