Here's an interesting (and controversial) proposal and discussion: "Decentralise...

		tlrobinson on April 11, 2013 \| parent \| context \| favorite \| on: How I got robbed of 34 btc on Mt.Gox today Here's an interesting (and controversial) proposal and discussion: "Decentralised crime fighting using private set intersection protocols" - Mike Hearn https://bitcointalk.org/index.php?topic=157130.0