I put some thought into how to do this. I think it would be hard to get right. One way, which is total vaporware and probably riddled with security flaws: ht

I put some thought into how to do this. I think it would be hard to get right. One way, which is total vaporware and probably riddled with security flaws: https://docs.google.com/file/d/0B3qaT-ZL6aeKOHNEQWdpZEtRYWc/edit?pli=1 https://docs.google.com/file/d/0B3qaT-ZL6aeKOHNEQWdpZEtRYWc/... https://bitcointalk.org/index.php?topic=64421.5 https://bitcointalk.org/index.php?topic=64421.5