Who generates the nonce? What makes it random? How is nonce-guessing important to the competitive process of mining? What happens if the hashing algorithm (SHA-256) was compromised? Is quantum computing a threat? More on nonces and the mining process: https://github.com/bitcoinbook/bitcoinbook/blob/8ae3c056fb257111bda8883d9d204e8476f9870c/ch09.asciidoc More about the SHA-1 collision: https://security.googleblog.com/2017/02/announcing-first-sha1-collision.html More about SHA-1 and Bitcoin: https://bitcoin.stackexchange.com/questions/75135/is-sha-1-used-in-bitcoin CORRECTION: At 5:53, I described what a collision was. However, the definition I outlined was actually for a pre-image attack, which is distinct from collision attacks. The subtitles have been edited to include the correction. https://en.wikipedia.org/wiki/Preimage_attack These questions are from the MOOC 7.2 and 9.2, which took place on February 26th 2017 and February 23rd 2018 respectively. Andreas is a teaching fellow with the University of Nicosia. The first course in their Master of Science in Digital Currency degree, DFIN-511: Introduction to Digital Currencies, is offered for free as an open enrollment MOOC course to anyone interested in learning about the fundamental principles. 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: 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 Miners, pools, and consensus - https://youtu.be/JHz7LM4ncLw 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 Migrating to post-quantum cryptography - https://youtu.be/dkXKpMku5QY 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 Decentralized power, leade ... https://www.youtube.com/watch?v=d4xXJh677J0

Bitcoin scaling, on-chain vs. off-chain. Trustless second layer technologies. Lightning Network. Requiring a super-majority to make changes to the protocol, while others make trade-offs toward centralisation. Store-of-value. Different leagues of scaling and governance. The first question is from a talk which took place at the Blockchain Africa Conference on March 2nd 2017 at the Focus Rooms in Johannesburg, South Africa: http://blockchainafrica.co/speakers/andreas-m-antonopoulos/ Watch the full talk here: https://youtu.be/SMEOKDVXlUo The second question is from a talk which took place on July 7th 2017 at a Bloktex event hosted by the Wisma BeeOn Group in Kuala Lumpur, Malaysia: https://antonopoulos.com/event/the-future-of-money-kuala-lumpur-malaysia/ Watch the full talk here: https://youtu.be/HaJ1hvon0E0 RELATED: SegWit, scaling, and consensus - https://youtu.be/Jc7mrR6AAto The Lightning Network - https://youtu.be/vPnO9ExJ50A The Internet will eat your business - https://youtu.be/DXLZSgf4b8Q Fee markets, SegWit, and scaling - https://youtu.be/zxt-FLzZPhg Altcoins and the scaling debate - https://youtu.be/slbpdW-H3yk Does Lightning need SegWit? - https://youtu.be/qQuNv_qx1xs Scaling is a moving target - https://youtu.be/pT9kJq_Ogrk What is the role of nodes? - https://youtu.be/fNk7nYxTOyQ Rules versus Rulers - https://youtu.be/9EEluhC9SxE Microfinance and streaming money - https://youtu.be/xs6hUcfuX9w Is Bitcoin a democracy? - https://youtu.be/TC3Hq76UT5g An Evolutionary Perspective on Currency - https://youtu.be/G-25w7Zh8zk The Lion and the Shark: Divergent Evolution in Cryptocurrency - https://youtu.be/d0x6CtD8iq4 Open source as cross pollination - https://youtu.be/JTHV6PA-Dw8 Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and well-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. THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8 MASTERING BITCOIN: https://www.amazon.co.uk/Mastering-Bitcoin-Unlocking-Digital-Cryptocurrencies/dp/1449374042 [NEW] MASTERING BITCOIN, 2nd Edition: https://www.amazon.com/Mastering-Bitcoin-Programming-Open-Blockchain/dp/1491954388 Subscribe to the channel to learn more about Bitcoin & open blockchains! If you want early-access to talks and a chance to participate in a monthly LIVE Q&A with Andreas, become a patron: https://www.patreon.com/aantonop Music: "Unbounded" by Orfan (https://www.facebook.co ... https://www.youtube.com/watch?v=vCxmHwqyJWU

Talk recorded on January 27th 2015, at the O'Reilly Radar Summit "Bitcoin and the Blockchain" in San Francisco, CA. A talk about bitcoin, network architecture, decentralization, innovation, and the economics of open systems. Video is licensed CC-BY Keywords/phrases: What do you think of the argument that Bitcoin can only have either secure or cheap transactions? More worried about optimization of the blockchain today. Lessons from "concern journalism" on Ethernet, IP, storage, etc. assuming technology is static. Problems are opportunities. ... https://www.youtube.com/watch?v=J3sEcuCc9fg

Bitcoin's energy usage has long been controversial but this time it's not what you'd expect, a story about a rogue power plant kicks off a wide ranging discussion between the hosts, touching on key issues like game theory, network security and more. Links from this Speaking of Bitcoin episode: https://www.vice.com/en/article/bvz93q/bitcoin-miner-facing-dollar56m-fine-for-starting-rogue-power-plant https://bitcoin.sipa.be/ https://www.coindesk.com/business/ Hosts: Andreas M. Antonopoulos, Adam B. Levine, Jonathan Mohan, Dr. Stephanie Murphy Any questions or comments? Send an email to adam@speakingofbitcoin.show ... https://www.youtube.com/watch?v=TPmuGmfQF5E