Adds a sage notebook for ECDSA signing and verifying.

[bitcoinninja] / index.html

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@@ -31,6 +31,11 @@ Papers of interest:
 <li><a href="http://freico.in/docs/freimarkets.pdf">Freimarkets: a bitcoin extension to support user issued assets, p2p lending, options and more.</a>
 </ul>
 
+<a href="http://sagemath.org/">Sage</a> notebooks:
+<ul>
+<li><a href="secp256k1.ecdsa.sage">ECDSA with secp256k1</a>
+</ul>
+
 Edit this page at <a href="https://github.com/TheBlueMatt/bitcoinninja">https://github.com/TheBlueMatt/bitcoinninja</a>
 
 </body>