Update link to final version of Bitcoin SoK paper

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@@ -29,7 +29,7 @@ Useful resources:
 
 Papers of interest:
 <ul>
-<li><a href="https://github.com/citp/bitcoin-sok">Bitcoin systematization of knowledge</a></li>
+<li><a href="http://www.jbonneau.com/doc/UDBFPGS15-IEEESP-secure_messaging_sok.pdf">Bitcoin systematization of knowledge</a></li>
 <li><a href="http://freico.in/docs/freimarkets.pdf">Freimarkets: a bitcoin extension to support user issued assets, p2p lending, options and more.</a></li>
 <li><a href="http://blockstream.com/sidechains.pdf">Enabling Blockchain Innovations with Pegged Sidechains</a></li>
 <li><a href="https://bitcoin.org/bitcoin.pdf">Bitcoin: A Peer-to-Peer Electronic Cash System</a></li>