Merge pull request #5 from gmaxwell/ecdsa1

Adds a sage notebook for ECDSA signing and verifying.

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@@ -29,6 +29,7 @@ Papers of interest:
 <ul>
 <li><a href="https://github.com/citp/bitcoin-sok">Bitcoin systematization of knowledge</a>
 <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><a href="https://download.wpsoftware.net/bitcoin/wizardry/cryptonote-whitepaper.pdf">CryptoNote Whitepaper</a> containing an innovative ring-signature scheme</li>
 </ul>
 
 <a href="http://sagemath.org/">Sage</a> notebooks: