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@@ -29,7 +29,12 @@ 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>
+<li><a href="https://bitcoin.org/bitcoin.pdf">Bitcoin: A Peer-to-Peer Electronic Cash System</a></li>
+</ul>
+
+<a href="http://sagemath.org/">Sage</a> notebooks:
+<ul>
+<li><a href="secp256k1.ecdsa.sage">ECDSA with secp256k1</a>
 </ul>
 
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