Current stable versions of net-p2p/bitcoin{d,-qt} are broken due to a block validation bug. Please stabilize 0.5.6_rc2 ASAP. (Note, 0.4.7_rc2 is also fixed, but 0.4.x was never keyworded stable)
I think security should take it
Sorry for the mailspam. There was a misunderstanding with maintainer. It is not a security issue.
amd64 stable
arm has not stable keywords
x86 stable. Last arch, closing.