An Introduction to Shared Security <iframe width="1024px" height="576px" src="https://www.youtube.com/embed/CY4HxXkNhhM?si=d6g6izywKg2Hpfh-" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe> <iframe src="https://polkadot-blockchain-academy.github.io/pba-content/hong-kong-2024/syllabus/7-Polkadot/Shared_Security_slides.html#/" width="1024px" height="576px"></iframe>