So glad to see this happening!

I suggested this in June 2011 and put some thoughts about what it may and may not include. Really happy to see Sirius making this happen! More power to your elbow!

Here's my post from two years ago:
https://bitcointalk.org/index.php?topic=17290.0

I believe there's this guy Joe Cascio working on something similar:
http://joecascio.net/joecblog/2013/03/25/collateralized-identity-using-bitcoin-to-suppress-sockpuppets/