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diff --git a/index.html b/index.html
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+++ b/index.html
@@ -15,6 +15,7 @@ Public summaries of some wizardly thinking:
 <li><a href="https://download.wpsoftware.net/bitcoin/wizardry/brs-arbitrary-output-sizes.txt">Output size obfuscation for Bytecoin</a></li>
 <li><a href="https://iwilcox.me.uk/2014/no-from-address">There Is No 'From' Address</a>
 <li><a href="https://iwilcox.me.uk/2014/proving-bitcoin-reserves">Proving Your Bitcoin Reserves</a>
+<li><a href="http://blockstream.com/sidechains.pdf">Sidechains</a>
 </ul>
 
 Useful resources:
@@ -28,6 +29,13 @@ Useful resources:
 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://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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