<?xml version="1.0" encoding="UTF-8"?><oembed><type>video</type><version>1.0</version><html>&lt;iframe src=&quot;https://www.loom.com/embed/8647de4f71c74dd6a9901921d796d7e8&quot; frameborder=&quot;0&quot; width=&quot;1920&quot; height=&quot;1440&quot; webkitallowfullscreen mozallowfullscreen allowfullscreen&gt;&lt;/iframe&gt;</html><height>1440</height><width>1920</width><provider_name>Loom</provider_name><provider_url>https://www.loom.com</provider_url><thumbnail_height>1440</thumbnail_height><thumbnail_width>1920</thumbnail_width><thumbnail_url>https://cdn.loom.com/sessions/thumbnails/8647de4f71c74dd6a9901921d796d7e8-e4dfd6ae86014998.gif</thumbnail_url><duration>121.846</duration><title>CipherScroll - New CTF platform on-chain</title><description>I introduce Surface Call, a new way to record challenges directly on the blockchain. By solving challenges, you create a proof on the chain, showcasing your problem-solving skills. I demonstrate a challenge involving deciphering a hidden message using base 64 or 4 encoding. Participants can submit their solutions, which are verified on the chain, providing a record of their success. This system allows for open participation and offers potential benefits for learning and future opportunities.</description></oembed>