Explore the innovative Algorand blockchain in this 32-minute lecture by Jing Chen from Stony Brook University and Algorand Inc. Delve into the core concepts of a Pure Proof of Stake system, examining its permissionless nature and protocol guarantees. Understand the structure, challenges, and various selection methods including public selection, self-selection, and token selection. Gain insights into unique signature approaches and alternative ideas in blockchain technology. Conclude with a comprehensive summary of Algorand's secure, scalable, and decentralized architecture.