[littlecranky67]

I did say heuristics, not valid/invalid. You can do all sorts of analytics upon receiving a transaction, and then decide to forward or drop the transaction based on that heuristics. Valid/Invalid could become the minimum requirement for a transaction to be forwarded.

[nehan]

I can't think of heuristics available on the Bitcoin P2P network that would be helpful for this, but I'm curious if you have any in mind.