An academic lecture by Andreas M. Antonopoulos explaining the consensus algorithm, "Proof of Work", used by bitcoin and many other blockchains. Andreas is a UCL alum. This talk was presented in collaboration with the Department of Computer Science at University College London. If you want early-access to talks and a chance to participate in the monthly live Q&As with Andreas, become a patron: https://www.patreon.com/aantonop RELATED: What is Consensus: Rules without Rulers - https://youtu.be/2tqo7PX5Pyc Bitcoin Security: Bubble Boy and the Sewer Rat - https://youtu.be/810aKcfM__Q Bitcoin, A New Species of Money: An Evolutionary Perspective on Currency - https://youtu.be/G-25w7Zh8zk Measuring Success: Price or Principle - https://youtu.be/mPMsbgWl9p4 Why Open Blockchains Matter - https://youtu.be/uZPIz3ArQww Decentralised Globalisation - https://youtu.be/QoiR4aNbTOw Investing in Education instead of Speculation - https://youtu.be/6uXAbJQoZlE Beyond Price: Bitcoin's Impact on the Future - https://youtu.be/rvwVbRQ5Ysc How does the Blockstream satellite work? - https://youtu.be/C1GxxlqRkKQ Regulation and the bank boycott - https://youtu.be/8ypH69Cb1l0 Remittances and smuggling in Venezuela - https://youtu.be/RRXecXfWARw Bitcoin as everyday currency - https://youtu.be/xYvvSV4mjH0 What is the appeal of sound money? - https://youtu.be/tfba4FFErrQ Hyperbitcoinization - https://youtu.be/AB5MU5fXKfo Why permissioned blockchains fail - https://youtu.be/GEQzlJ_WL-E Protocol development security - https://youtu.be/4fsL5XWsTJ4 How to avoid re-creating systems of control - https://youtu.be/EfoGnDoaBL8 Wallets, nodes, and monetary sovereignty - https://youtu.be/8Hb3tUn8s4E Is bitcoin testing governments? - https://youtu.be/UfRGo2LAIpo Will governments let privacy coins exist? - https://youtu.be/30sjEW70rLE Geopolitics and state-sponsored attacks - https://youtu.be/htxPRTJLK-k Governance and social attack immunity - https://youtu.be/PjOHatoX6Fk Sanctions and censorship resistance - https://youtu.be/DeXe5eGRl7E State-sponsored digital currencies and trust minimization - https://youtu.be/dSpFbg7jlDw Taxation and failed societies - https://youtu.be/xspdlOtBjcE Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and respected figures in bitcoin. Follow on Twitter: @aantonop https://twitter.com/aantonop Website: https://antonopoulos.com/ He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters. Subscribe to the channel to learn more about Bitcoin & open blockchains; click on the red bell to enable notifications about new videos! MASTERING BITCOIN, 2nd Edition: https:// ... https://www.youtube.com/watch?v=fw3WkySh_Ho

What is currently the biggest threat to Bitcoin? 51% attacks? Government crackdowns? Massive failure of the electric grid? Pandemics? ...Sharknados? This question is from the Patrion Q&A session which took place on April 25th, 2020. If you want early-access to talks and a chance to ask questions in the monthly live Q&As with Andreas, become a Community Builder on Patreon: https://www.patreon.com/aantonop Related Videos: Bitcoin Q&A: Miners, pools, and consensus - https://youtu.be/JHz7LM4ncLw Bitcoin Q&A: Could a state-sponsored 51% attack work? - https://youtu.be/KUd8ZGgm6Qo Bitcoin Q&A: Will governments ban cryptocurrencies? - https://youtu.be/LIQkuF_I5Xo Bitcoin Q&A: Will Bitcoin survive global government intervention & regulation? - https://youtu.be/_QS-wCxnqr0 Bitcoin Q&A: Biggest threat to cryptocurrencies - https://youtu.be/MNXSDaD97x0 Bitcoin Q&A: Is quantum computing a threat? - https://youtu.be/wlzJyp3Qm7s Andreas M. Antonopoulos is a best-selling author, speaker, educator, and highly sought after expert in Bitcoin and open blockchain technologies. Andreas has written two best-selling technical books for programmers, “Mastering Bitcoin” and “Mastering Ethereum”. He has published “The Internet of Money” series of books, which focus on the social, political, and economic importance and implications of these technologies. He is known for making complex subjects easy to understand and highlighting both the positive and negative impacts these technologies can have on our global societies. Subscribe to this channel to learn more about Bitcoin & open blockchains; click on the red bell to enable notifications about new videos! Follow on Twitter: @aantonop // https://twitter.com/aantonop Connect on Facebook: https://www.facebook.com/AndreasMAntonopoulos Connect on LinkedIn: https://www.linkedin.com/company/aantonop/ Follow on Instagram: https://www.instagram.com/amantonop/ Learn More: aantonop.com Listen to the “Unscrypted” Podcast: https://aantonop.com/unscrypted/ MASTERING BITCOIN, 2nd Edition: https://amzn.to/2xcdsY9 Translations of MASTERING BITCOIN: https://bitcoinbook.info/translations-of-mastering-bitcoin/ MASTERING ETHEREUM: https://amzn.to/2xdxmlK THE INTERNET OF MONEY, v1: https://amzn.to/2ykmXFs THE INTERNET OF MONEY, v2: https://amzn.to/2IIG5BJ THE INTERNET OF MONEY, v3: https://aantonop.io/tiomv3 Translations of THE INTERNET OF MONEY: Spanish, 'Internet del Dinero' (v1) - https://amzn.to/2yoaTTq German, 'Das Internet des Geldes' (v1) - https://amzn.to/2LEiyqO German, 'Das Internet des Geldes' (v2) - https://amzn.to/2VCzse5 French, 'L'internet de l'argent' (v1) - https://www.amazon.fr/Linternet-largent-Andreas-M-Antonopoulos/dp/2856083390 Vietnamese, 'Internet Của Tiền Tệ' (v1) - https://alphabooks.vn/khi- ... https://www.youtube.com/watch?v=JNVqXE2bSfE

Explain the locking and unlocking scripts in transactions. How are transaction signatures verified by nodes and miners? What happens to unconfirmed transactions from orphaned blocks? Do non-mining nodes get a reward? These questions are from the third and fourth sessions of MOOC 12, which took place on September 27th and October 4th 2019. If you want early-access to talks and a chance to participate in the monthly live Q&As with Andreas, become a patron: https://www.patreon.com/aantonop RELATED: Measuring Success: Price or Principle - https://youtu.be/mPMsbgWl9p4 Beyond Price: Bitcoin's Impact on the Future - https://youtu.be/rvwVbRQ5Ysc Consensus Algorithms, Blockchain Technology, and Bitcoin - https://youtu.be/fw3WkySh_Ho Advanced Bitcoin Scripting Part 1: Transactions and Multisig - https://youtu.be/8FeAXjkmDcQ Advanced Bitcoin Scripting Part 2: SegWit, Consensus, and Trustware - https://youtu.be/pQbeBduVQ4I What is Consensus: Rules without Rulers - https://youtu.be/2tqo7PX5Pyc Forkology: A Study of Forks for Newbies - https://youtu.be/rpeceXY1QBM Bitcoin: Where the Laws of Mathematics Prevail - https://youtu.be/HaJ1hvon0E0 Software distribution security - https://youtu.be/_V0vqy046YM What is mining? - https://youtu.be/t4p4iMqmxbQ The mining process - https://youtu.be/L4Xtau0YMJw Nonces, mining, and quantum computing - https://youtu.be/d4xXJh677J0 Iterating nonces and the block reward - https://youtu.be/tjn2aoMaFlY Miners, pools, and consensus - https://youtu.be/JHz7LM4ncLw Mining, energy prices, and fee market - https://youtu.be/hrVCd6Pt4l4 What is difficulty targeting? - https://youtu.be/h429LCTRmQw Hash functions, SHA-256 mining, and addresses - https://youtu.be/zI9jnB8HFkI Genesis block and coinbase transactions - https://youtu.be/strhfzJ56QE Cryptographic primitives - https://youtu.be/RIckQ6RBt5E The rules of Bitcoin (part 1) - https://youtu.be/VnQu4uylfOs The rules of Bitcoin (part 2) - https://youtu.be/vtIp0GP4w1E Rules versus rulers - https://youtu.be/9EEluhC9SxE The value of proof-of-work - https://youtu.be/ZDGliHwstM8 Could a state-sponsored 51% attack work? - https://youtu.be/KUd8ZGgm6Qo Honest nodes and consensus - https://youtu.be/KAhY2ymI-tg Spam transactions and Child Pays For Parent (CPFP) - https://youtu.be/t3c0E4fkSNs Is Bitcoin a democracy? - https://youtu.be/TC3Hq76UT5g Governments versus Proof-of-Work or Proof-of-Stake - https://youtu.be/qrwgYDAoZV0 Decentralized power, leaderless governance - https://youtu.be/E5VbDlQTPzU What is the role of nodes? - https://youtu.be/fNk7nYxTOyQ Why running a node is important - https://youtu.be/oX0Yrv-6jVs Spam transactions and Child Pays For Parent (CPFP) - https://youtu.be/t3c0E4fkSNs Energy consumption - https://youtu.be/2T0OUIW89II Solar energy and mining in space - https://youtu.be/cus ... https://www.youtube.com/watch?v=dm-bgXOuJWA

How do I construct a transaction with multiple inputs? Which wallets offer coin selection / management features? Explain the concept of change. Take a look at Chapter 6 of 'Mastering Bitcoin': https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch06.asciidoc These questions are from the third and sixth session of MOOC 11, which took place on February 14th and March 7th 2019, respectively. If you want early-access to talks and a chance to participate in the monthly live Q&As with Andreas, become a patron: https://www.patreon.com/aantonop RELATED: How do I choose a wallet? - https://youtu.be/tN6b62sEpsY Secure, tiered storage system - https://youtu.be/uYIVuZgN95M Hardware wallets and attack surface - https://youtu.be/8mpDcBfNA7g Setting up secure storage devices - https://youtu.be/wZ9LxLLvfXc What is a private key? - https://youtu.be/xxfUpIV9wRI How do mneomonic seeds work? - https://youtu.be/wWCIQFNf_8g Using paper wallets - https://youtu.be/cKehFazo8Pw Wallet design and mass adoption - https://youtu.be/WbZX6BDZJHc Cryptographic primitives - https://youtu.be/RIckQ6RBt5E Public keys vs. addresses - https://youtu.be/8es3qQWkEiU The lifecycle of a transaction - https://youtu.be/kpnTb6NWih0 Re-using addresses - https://youtu.be/4A3urPFkx8g Passphrases and seed storage - https://youtu.be/jP7pEgBpaO0 Coin selection and privacy - https://youtu.be/3Ck683CQGAQ Multi-signature and distributed storage - https://youtu.be/cAP2u6w_1-k Is quantum computing a threat? - https://youtu.be/wlzJyp3Qm7s The 21 million supply cap - https://youtu.be/AABkJ55Zz3A Denominations and voluntary burning - https://youtu.be/tqL0ehMRxbk Divisibility and deflationary monetary policy - https://youtu.be/xhLgxX_wU6E Inflation and debt systems - https://youtu.be/6CwxHiKf27A How to get people to care about security - https://youtu.be/Ji1lS9NMz1E Honest nodes and consensus - https://youtu.be/KAhY2ymI-tg Why running a node is important - https://youtu.be/oX0Yrv-6jVs Wallets, nodes, and monetary sovereignty - https://youtu.be/8Hb3tUn8s4E Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and respected figures in bitcoin. Follow on Twitter: @aantonop https://twitter.com/aantonop Website: https://antonopoulos.com/ He is the author of two books: “Mastering Bitcoin,” published by O’Reilly Media and considered the best technical guide to bitcoin; “The Internet of Money,” a book about why bitcoin matters. Subscribe to the channel to learn more about Bitcoin & open blockchains; click on the red bell to enable notifications about new videos! MASTERING BITCOIN, 2nd Edition: https://amzn.to/2xcdsY9 Translations of MASTERING BITCOIN: https://bitcoinbook.info/translations-of-mastering-bitcoin/ THE INTERNET OF MONEY, v1: https ... https://www.youtube.com/watch?v=fjY3wo5UNnw