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@@ -39,6 +39,15 @@ Papers of interest:
 <li><a href="secp256k1.ecdsa.sage">ECDSA with secp256k1</a></li>
 </ul>
 
+Implementations of cool things:
+<ul>
+<li><a href="https://github.com/bitcoin/bitcoin">The one that started it all</a></li>
+<li><a href="https://github.com/unsystem/paypub">PayPub: Trustless payments for information publishing on Bitcoin</a></li>
+<li><a href="https://github.com/zw/PoLtree/">proving Bitcoin liabilities, in Clojure.</a> or <a href="https://github.com/olalonde/proof-of-liabilities">Proof of Liabilities, in JavaScript</a></li>
+<li><a href="https://github.com/petertodd/timelock">Create a secret key that can be decrypted in a known amount of time using parallel-serial hash chains.</a></li>
+<li><a href="https://github.com/Blockstream/contracthashtool">Pay to Contract Hash calculator</a></li>
+</ul>
+
 Edit this page at <a href="https://github.com/TheBlueMatt/bitcoinninja">https://github.com/TheBlueMatt/bitcoinninja</a>
 
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