Explore the fundamentals and applications of blockchain technology in this comprehensive 57-minute conference talk. Delve into the origins of Bitcoin and its underlying blockchain technology, understanding its potential beyond digital currencies. Discover various blockchain implementations, including those used by Nasdaq and Azure's "Blockchain as a Service." Learn about the structure of blockchain, including concepts like ledgers, private keys, and unspent transactions. Examine the Bitcoin network, Ethereum, and smart contracts, while also considering architecture, flow, and lessons learned. Investigate real-world use cases, from Dogecoin to property transactions, and gain insights into the future of blockchain technology. By the end of this talk, acquire a solid understanding of what blockchain is, why it matters, and how to build decentralized applications (Dapps) with interesting properties.