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Understanding SegWit2X & Replay Attacks
 
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Thinking about purchasing a Ledger Nano Hardware Wallet? Browse their official website: https://www.ledgerwallet.com/r/67ef Want to join coinbase to begin your crypto journey? Here’s a link to get free $10: https://www.coinbase.com/join/558828dc34383271a500003b Step up your game and Check Out Binance too: https://www.binance.com/?ref=10080191 Join the Robinhood app and invite your friends to Robinhood and win free stock. Here's my invite: http://share.robinhood.com/heidic1 Find me on Steemit: www.steemit.com/@heiditravels Twitter: @blockchainchick Instagram: @hheidiann If you’re looking for an app that tracks the price of BTC & ETH and many other coins, check out the CoinView App: https://play.google.com/store/apps/details?id=br.com.freeflowt.coinview LINKS FOR ADDITIONAL READING FOR THIS VIDEO & ALL INFO IN TEXT DOWN BELOW Explaining SegWit2X Replay attacks: https://bitcoinmagazine.com/articles/segwit2x-and-case-strong-replay-protection-and-why-its-controversial/ More on block size vs block weight: https://medium.com/@jimmysong/understanding-segwit-block-size-fd901b87c9d4 https://www.coindesk.com/explainer-what-is-segwit2x-and-what-does-it-mean-for-bitcoin/ List of supporters for SegWit2X: https://en.bitcoin.it/wiki/Segwit_support This is an attempt to address the scaling issues currently plaguing Bitcoin by increasing the size or more specifically, the weight of the blocks of the Bitcoin blockchain. The reason this change can only be implemented as a hard fork is due to the fact that this change requires the legacy nodes to upgrade. You can think of legacy nodes as the original nodes of the bitcoin blockchain that have never upgraded. This means they follow the original protocols set in place when Bitcoin was first created. SegWit2X would require these nodes to accept blocks that they otherwise would have rejected prior to the hard fork. Because this change would ultimately increase what is being called the weight of a block, this in turn increases the workload for the nodes of the Bitcoin Network. It will also affect the miners. I’ll include links down below that go much more in depth on how exactly the nodes and miners will be effected so you can get a better idea of how this hard fork will change things. This may sound like a simple and logical move to help the network deal with the increase of transactions, but it’s important to note that like everything else involving Bitcoin things get technical and philosophical. There is a very important issue with SegWit2X that I think everyone who uses Bitcoin needs to be aware of, and that is the threat of replay attacks. If a hard fork occurs and neither the new or original blockchain implement protocols and protect against replay attacks, things can go south. When a blockchain splits, the original blockchain or legacy blockchain and all of its past transactions are the same on the newly split blockchain. This is why we are able to receive an equal amount of the newly created coin if we were holding the original coin at the time of the split. At the time of the split however, if there is no replay protection protocol implemented by either the legacy blockchain, or the new one, new transactions that occur on either chain could be copied and sent on the other chain. This would cause anyone sending BTC or the new hard forked coin to accidentally send both coins to a lucky recipient. This also opens the door for malicious actors to receive both coins when the intention was to send only one. replay protection- a protocol that ensures that new transactions are valid on one blockchain and not the other. It’s true that either the original blockchain or the newly formed blockchain can implement this replay protection to prevent this type of double spending. However it would be much easier for the new blockchain to implement this security. This is because the original Bitcoin blockchain network is so widely spread the likelihood that this security protocol would be implemented in time is very slim.
Views: 7503 Crypto Tips
Bitcoin Q&A: Passphrases and seed storage
 
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Do passphrases protect against leaks or compromises of mnemonic seed words? Why are brain wallets usually insecure? Why should you not "roll your own crypto" and promote creative schemes that deviate from the standards (like BIP39), without at least getting peer review and testing from other developers, cryptographers, or security researchers? See the documentation and support pages of various hardware wallets for more information: Trezor - https://doc.satoshilabs.com/trezor-faq/overview.html https://blog.trezor.io/using-advanced-recovery-on-trezor-4af0eb53c3bb Ledger Nano S - https://support.ledgerwallet.com/hc/en-us/articles/360000613793-Initialize-your-device Ledger Blue - https://support.ledgerwallet.com/hc/en-us/articles/360005835414-Initialize-your-device KeepKey - https://help.keepkey.com/start-here/initialize-your-keepkey https://help.keepkey.com/how-to-guides/how-to-recover-your-keepkey On the topic of inheritance and estate planning, see: https://youtu.be/4g8rO_queMw These questions are from the August monthly Patreon Q&A session, which took place (late) on September 1st 2018. 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 Re-using addresses - https://youtu.be/4A3urPFkx8g Coin selection and privacy - https://youtu.be/3Ck683CQGAQ Multi-signature and distributed storage - https://youtu.be/cAP2u6w_1-k Nonces, mining, and quantum computing - https://youtu.be/d4xXJh677J0 Software distribution security - https://youtu.be/_V0vqy046YM Protocol development security - https://youtu.be/4fsL5XWsTJ4 Geopolitics and state-sponsored attacks - https://youtu.be/htxPRTJLK-k 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 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. THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8 [NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andreas-M-Antonopoulos/dp/194791006X/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 Translations of MASTERING BITCOIN: https://bitcoinbook.info/translations-of-mastering-bitcoin/ Subscribe to the channel to learn more about Bitcoin & open blockchains! Music: "Unbounded" by Orfan (https://www.facebook.com/Orfan/) Outro Graphics: Phneep (http://www.phneep.com/) Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Views: 8912 aantonop
What is PHP and why is XSS so common there? - web 0x02
 
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We learn about simple php web apps and why it's so common that php applications have XSS issues. It's all about shitty tutorials. -=[ 🔴 Stuff I use ]=- → Microphone:* https://amzn.to/2LW6ldx → Graphics tablet:* https://amzn.to/2C8djYj → Camera#1 for streaming:* https://amzn.to/2SJ66VM → Lens for streaming:* https://amzn.to/2CdG31I → Connect Camera#1 to PC:* https://amzn.to/2VDRhWj → Camera#2 for electronics:* https://amzn.to/2LWxehv → Lens for macro shots:* https://amzn.to/2C5tXrw → Keyboard:* https://amzn.to/2LZgCFD → Headphones:* https://amzn.to/2M2KhxW -=[ ❤️ Support ]=- → per Video: https://www.patreon.com/join/liveoverflow → per Month: https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/join -=[ 🐕 Social ]=- → Twitter: https://twitter.com/LiveOverflow/ → Website: https://liveoverflow.com/ → Subreddit: https://www.reddit.com/r/LiveOverflow/ → Facebook: https://www.facebook.com/LiveOverflow/ -=[ 📄 P.S. ]=- All links with "*" are affiliate links. LiveOverflow / Security Flag GmbH is part of the Amazon Affiliate Partner Programm. #WebSecurity
Views: 58012 LiveOverflow
The Blockchain & Bitcoin - Computerphile
 
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Blockchain is the underlying technology behind cryptocurrencies bringing together Merkle trees, Hashing & Distributed Architecture. Christopher Ellis explains. Note1 - At 6:46 when Chris is drawing the Merkle Tree, C would actually be duplicated and hashed with itself not with B. So you would get H(C - C) instead of H(B - C). Note2 - At minute 17, Christopher mentioned the mining reward halving at 21,000 bitcoins but meant 210,000 blocks. Public Key Encryption: https://youtu.be/GSIDS_lvRv4 The Perfect Code: https://youtu.be/WPoQfKQlOjg http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 211977 Computerphile
Writing a simple Program in C - bin 0x02
 
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A fast introduction into programming with C. -=[ 🔴 Stuff I use ]=- → Microphone:* https://amzn.to/2LW6ldx → Graphics tablet:* https://amzn.to/2C8djYj → Camera#1 for streaming:* https://amzn.to/2SJ66VM → Lens for streaming:* https://amzn.to/2CdG31I → Connect Camera#1 to PC:* https://amzn.to/2VDRhWj → Camera#2 for electronics:* https://amzn.to/2LWxehv → Lens for macro shots:* https://amzn.to/2C5tXrw → Keyboard:* https://amzn.to/2LZgCFD → Headphones:* https://amzn.to/2M2KhxW -=[ ❤️ Support ]=- → per Video: https://www.patreon.com/join/liveoverflow → per Month: https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/join -=[ 🐕 Social ]=- → Twitter: https://twitter.com/LiveOverflow/ → Website: https://liveoverflow.com/ → Subreddit: https://www.reddit.com/r/LiveOverflow/ → Facebook: https://www.facebook.com/LiveOverflow/ -=[ 📄 P.S. ]=- All links with "*" are affiliate links. LiveOverflow / Security Flag GmbH is part of the Amazon Affiliate Partner Programm. #Programming
Views: 83941 LiveOverflow
IOHK | Dr. Peter Gaži, presenting Ouroboros at MIT.
 
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Developing a secure proof of stake algorithm is one of the big challenges in cryptocurrency. The Ouroboros protocol has the distinction of being the first proof of stake algorithm that is provably secure and has been peer reviewed at a leading cryptography conference, Crypto 2017. This is essential for a protocol that is to be the foundation of a cryptocurrency, an infrastructure that must be relied on to carry billions of dollars worth of value. In addition to security, if blockchains are going to become infrastructure for new financial systems they must be able to comfortably handle millions of users. The key to scaling up is proof of stake, a far more energy efficient and cost effective algorithm, and as such this research represents a significant step forward in cryptography. Ouroboros is the only provably secure, peer reviewed proof of stake protocol to be implemented – the protocol is an integral part of Cardano, a blockchain system launched in September 2017 and undergoing further extensive development. https://iohk.io/research/papers/#XJ6MHFXX Peter Gaži did his master studies in Computer Science at Comenius University in Bratislava, and obtained his PhD. in Cryptography from ETH Zurich under the supervision of Prof. Ueli Maurer. Later he worked as a postdoc in the Cryptography research group of Prof. Krzysztof Pietrzak at Institute of Science and Technology Austria. Currently, he is a full-time research fellow at IOHK. Peter’s research interests include problems related to security analysis of symmetric cryptography constructions, hash functions and memory-hard functions. His work at IOHK is mostly focused on cryptocurrencies and blockchains. https://iohk.io/team/peter-gazi/ -- Input Output See more at: https://iohk.io Get our latest news updates: https://iohk.io/blog/ Meet the team: https://iohk.io/team/ Learn about our projects: https://iohk.io/projects/cardano/ Read our papers: http://iohk.link/paper-ouroboros Visit our library: https://iohk.io/research/library/ In the press: https://iohk.io/press/ Work with us: https://iohk.io/careers/ See more on Cardano: https://iohk.io/projects/cardano/
Views: 6295 IOHK
Don't trust time
 
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Clickbait title. Just a bit of brain food. Games, licenses and many other things depend on a good time source. But where does the time come from and should you trust it? -=[ 🔴 Stuff I use ]=- → Microphone:* https://amzn.to/2LW6ldx → Graphics tablet:* https://amzn.to/2C8djYj → Camera#1 for streaming:* https://amzn.to/2SJ66VM → Lens for streaming:* https://amzn.to/2CdG31I → Connect Camera#1 to PC:* https://amzn.to/2VDRhWj → Camera#2 for electronics:* https://amzn.to/2LWxehv → Lens for macro shots:* https://amzn.to/2C5tXrw → Keyboard:* https://amzn.to/2LZgCFD → Headphones:* https://amzn.to/2M2KhxW -=[ ❤️ Support ]=- → per Video: https://www.patreon.com/join/liveoverflow → per Month: https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/join -=[ 🐕 Social ]=- → Twitter: https://twitter.com/LiveOverflow/ → Website: https://liveoverflow.com/ → Subreddit: https://www.reddit.com/r/LiveOverflow/ → Facebook: https://www.facebook.com/LiveOverflow/ -=[ 📄 P.S. ]=- All links with "*" are affiliate links. LiveOverflow / Security Flag GmbH is part of the Amazon Affiliate Partner Programm.
Views: 176616 LiveOverflow
Bitcoin Q&A: Setting up secure storage devices
 
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How secure are mobile wallets compared to desktops or hardware wallets? How easy is it for each type of device to be compromised? Does a factory reset or re-installed operating system help? How hard is it to properly set up a factory-reset or airgapped laptops? Can malware be transmitted via USB? What is the Glacier Protocol? These questions are from the MOOC 9.4 session, as well as a monthly Patreon Q&A session, which took place on March 9th and March 31st 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: How do I choose a wallet? - https://youtu.be/tN6b62sEpsY Secure, tiered storage system - https://youtu.be/uYIVuZgN95M What is a private key? - https://youtu.be/xxfUpIV9wRI 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 Re-using addresses - https://youtu.be/4A3urPFkx8g Coin selection and privacy - https://youtu.be/3Ck683CQGAQ Multi-signature and distributed storage - https://youtu.be/cAP2u6w_1-k Nonces, mining, and quantum computing - https://youtu.be/d4xXJh677J0 Software distribution security - https://youtu.be/_V0vqy046YM Protocol development security - https://youtu.be/4fsL5XWsTJ4 Geopolitics and state-sponsored attacks - https://youtu.be/htxPRTJLK-k 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 On the topic of inheritance and estate planning, see: https://youtu.be/4g8rO_queMw 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. THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8 [NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andreas-M-Antonopoulos/dp/194791006X/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 Translations of MASTERING BITCOIN: https://bitcoinbook.info/translations-of-mastering-bitcoin/ Subscribe to the channel to learn more about Bitcoin & open blockchains! Music: "Unbounded" by Orfan (https://www.facebook.com/Orfan/) Outro Graphics: Phneep (http://www.phneep.com/) Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Views: 8500 aantonop
Syscalls, Kernel vs. User Mode and Linux Kernel Source Code - bin 0x09
 
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We will have a look at what syscalls are and what it has to do with the kernel mode an user mode. We do this by exploring a kernel function and trace it down to the assembler level. join the discussion: https://www.reddit.com/r/LiveOverflow/comments/415sxb/0x09_syscalls_kernel_vs_user_mode_and_linux/ -=[ 🔴 Stuff I use ]=- → Microphone:* https://amzn.to/2LW6ldx → Graphics tablet:* https://amzn.to/2C8djYj → Camera#1 for streaming:* https://amzn.to/2SJ66VM → Lens for streaming:* https://amzn.to/2CdG31I → Connect Camera#1 to PC:* https://amzn.to/2VDRhWj → Camera#2 for electronics:* https://amzn.to/2LWxehv → Lens for macro shots:* https://amzn.to/2C5tXrw → Keyboard:* https://amzn.to/2LZgCFD → Headphones:* https://amzn.to/2M2KhxW -=[ ❤️ Support ]=- → per Video: https://www.patreon.com/join/liveoverflow → per Month: https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/join -=[ 🐕 Social ]=- → Twitter: https://twitter.com/LiveOverflow/ → Website: https://liveoverflow.com/ → Subreddit: https://www.reddit.com/r/LiveOverflow/ → Facebook: https://www.facebook.com/LiveOverflow/ -=[ 📄 P.S. ]=- All links with "*" are affiliate links. LiveOverflow / Security Flag GmbH is part of the Amazon Affiliate Partner Programm.
Views: 64669 LiveOverflow
1. Introduction, Threat Models
 
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MIT 6.858 Computer Systems Security, Fall 2014 View the complete course: http://ocw.mit.edu/6-858F14 Instructor: Nickolai Zeldovich In this lecture, Professor Zeldovich gives a brief overview of the class, summarizing class organization and the concept of threat models. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
Views: 380955 MIT OpenCourseWare
Using z3 to find a password and reverse obfuscated JavaScript - Fsec2017 CTF
 
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Recently I attended fsec 2017 in croatia. And there was a cool CTF challenge I solved during the conference that I wanted to share. script: https://gist.github.com/LiveOverflow/11bde6352f52be33864f1fd657e7cde1 -=[ 🔴 Stuff I use ]=- → Microphone:* https://amzn.to/2LW6ldx → Graphics tablet:* https://amzn.to/2C8djYj → Camera#1 for streaming:* https://amzn.to/2SJ66VM → Lens for streaming:* https://amzn.to/2CdG31I → Connect Camera#1 to PC:* https://amzn.to/2VDRhWj → Camera#2 for electronics:* https://amzn.to/2LWxehv → Lens for macro shots:* https://amzn.to/2C5tXrw → Keyboard:* https://amzn.to/2LZgCFD → Headphones:* https://amzn.to/2M2KhxW -=[ ❤️ Support ]=- → per Video: https://www.patreon.com/join/liveoverflow → per Month: https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/join -=[ 🐕 Social ]=- → Twitter: https://twitter.com/LiveOverflow/ → Website: https://liveoverflow.com/ → Subreddit: https://www.reddit.com/r/LiveOverflow/ → Facebook: https://www.facebook.com/LiveOverflow/ -=[ 📄 P.S. ]=- All links with "*" are affiliate links. LiveOverflow / Security Flag GmbH is part of the Amazon Affiliate Partner Programm. #CTF
Views: 34378 LiveOverflow
Episode 2: How Blockchain Could Change Everything
 
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UVA Law professor George Geis and attorney Mayme Donohue of Hunton Andrews Kurth discuss the impact of blockchain — the same technology fueling the rise of cryptocurrencies — on a range of industries, including law.
Bitcoin Q&A: What is difficulty targeting?
 
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How does difficulty targeting work? What determines the desired pattern? Should difficulty re-targeting still happen every 2016 blocks? Could difficulty changes (and hence profitability changes) make all miners drop out? These questions are from the MOOC 7.2 and 9.2 sessions, 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: What is mining? - https://youtu.be/t4p4iMqmxbQ Miners, pools, and consensus - https://youtu.be/JHz7LM4ncLw The mining process - https://youtu.be/L4Xtau0YMJw Nonces, mining, and quantum computing - https://youtu.be/d4xXJh677J0 Honest nodes and consensus - https://youtu.be/KAhY2ymI-tg Genesis block and coinbase transactions - https://youtu.be/strhfzJ56QE Proof-of-work changes - https://youtu.be/AcaktuPdQrc SegWit and fork research - https://youtu.be/OorLoi01KEE What is the role of nodes? - https://youtu.be/fNk7nYxTOyQ Why running a node is important - https://youtu.be/oX0Yrv-6jVs 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. THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8 [NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andreas-M-Antonopoulos/dp/194791006X/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 Translations of MASTERING BITCOIN: https://bitcoinbook.info/translations-of-mastering-bitcoin/ Subscribe to the channel to learn more about Bitcoin & open blockchains! Music: "Unbounded" by Orfan (https://www.facebook.com/Orfan/) Outro Graphics: Phneep (http://www.phneep.com/) Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Views: 7220 aantonop
Keeping Digital Communities Weird
 
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In this talk, part of "The Future of Programmable Money" series, Andreas discusses digital gentrification and corporatisation, how this relates to the "blockchain not Bitcoin" phenomenon, and why we should maintain interesting communities both offline and online. This talk took place at the Sheraton Warsaw for the Polish Bitcoin Congress (Polski Kongres Bitcoin) on May 12th 2018 in Warsaw, Poland: http://kongresbitcoin.pl/ RELATED: Blockchain vs. Bullshit: Thoughts on the Future of Money - https://youtu.be/SMEOKDVXlUo Money as a System-of-Control - https://youtu.be/FyK4P7ZdOK8 The Stories We Tell About Money - https://youtu.be/ONvg9SbauMg Bitcoin: Privacy, Identity, Surveillance and Money - https://youtu.be/Vcvl5piGlYg ADISummit: Self-Sovereign Identity Panel - https://youtu.be/DZbyiJqKT8c My response to Jamie Dimon - https://youtu.be/1dEcdGc0tIo Aadhaar and blockchain identities - https://youtu.be/GylSvJf53zI How is fungibility tied to privacy? - https://youtu.be/VuI-8EwqIS8 Fungibility, privacy, anonymity - https://youtu.be/y3s8c7YDtXU Why KYC is dangerous - Microviolations of Privacy as Payment - https://youtu.be/rwF7nMWUjBs Could governments take over exchanges? - https://youtu.be/9PrJQeKl9w4 Separation of money and state - https://youtu.be/jGmtRA9S7_Y Borderless money - https://youtu.be/EZh1-ZqffOw 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. THE INTERNET OF MONEY, v1: https://www.amazon.co.uk/Internet-Money-collection-Andreas-Antonopoulos/dp/1537000454/ref=asap_bc?ie=UTF8 [NEW] THE INTERNET OF MONEY, v2: https://www.amazon.com/Internet-Money-Andreas-M-Antonopoulos/dp/194791006X/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.com/Orfan/) Outro Graphics: Phneep (http://www.phneep.com/) Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Views: 32446 aantonop
DEF CON 24 - Marc Newlin - MouseJack: Injecting Keystrokes into Wireless Mice
 
42:35
What if your wireless mouse was an effective attack vector? Research reveals this to be the case for mice from Logitech, Microsoft, Dell, Lenovo, Hewlett-Packard, Gigabyte, and Amazon. Dubbed 'MouseJack', this class of security vulnerabilities allows keystroke injection into non-Bluetooth wireless mice. Imagine you are catching up on some work at the airport, and you reach into your laptop bag to pull out your phone charger. As you glance back at your screen, you see the tail end of an ASCII art progress bar followed by your shell history getting cleared. Before you realize what has happened, an attacker has already installed malware on your laptop. Or maybe they just exfiltrated a git repository and your SSH keys. In the time it took you to plug in your phone, you got MouseJacked. The attacker is camped out at the other end of the terminal, equipped with a commodity USB radio dongle and a directional patch antenna hidden in a backpack, and boards her plane as soon as the deed is done. The reality of MouseJack is that an attacker can inject keystrokes into your wireless mouse dongle from over 200 meters away, at a rate of up to 7500 keystrokes per minute (one every 8ms). Most wireless keyboards encrypt the data going between the keyboard and computer in order to deter sniffing, but wireless mouse traffic is generally unencrypted. The result is that wireless mice and keyboards ship with USB dongles that can support both encrypted and unencrypted RF packets. A series of implementation flaws makes it possible for an attacker to inject keystrokes directly into a victim's USB dongle using easily accessible, cheap hardware, in most cases only requiring that the user has a wireless mouse. The majority of affected USB dongles are unpatchable, making it likely that vulnerable computers will be common in the wild for the foreseeable future. This talk will explain the research process that lead to the discovery of these vulnerabilities, covering specific tools and techniques. Results of the research will be detailed, including protocol behavior, packet formats, and technical specifics of each vulnerability. Additional vulnerabilities affecting 14 vendors are currently in disclosure, and will be revealed during this talk. Marc is a security researcher and software engineer at Bastille Networks, where he focuses on RF/IoT threats present in enterprise environments. He has been hacking on software defined radios since 2013, when he competed as a finalist in the DARPA Spectrum Challenge. In 2011, he wrote software to reassemble shredded documents for the DARPA Shredder Challenge, finishing the competition in third place out of 9000 teams. Twitter: @marcnewlin
Views: 46387 DEFCONConference
Developer Friendly Cryptography | Brice Williams | Hackers of CypherCon
 
46:34
(S1: E5) Software developers often make mistakes when using cryptography in applications, which tends to result in code with dangerous and subtle weaknesses. Some of this can be addressed through training, but should we expect all developers to be cryptography experts? Many developers only know to avoid writing their own ciphers, and rely on one of the many incomplete or incorrect code examples that exist on the internet. To make things worse, most cryptographic libraries in use today are designed to be used by experts and often result in misunderstandings by the average application developer. In this talk we will look at some common cryptography usage errors and why popular libraries often fall short. We will also discuss nuances such as backwards compatibility, FIPS 140-2 validation, and weak standards such as JOSE/JWT that contribute to the overall confusion. Brice will share some advice that you can provide to the development/engineering teams in your organization to not only make their job easier, but also ensure more secure cryptographic implementations. CypherCon website: https://cyphercon.com Thank you for watching, subscribing and your support. You can now help this channel with BUY ME A COFFEE: https://www.buymeacoffee.com/VideoWorkbench Connect with Video Workbench Productions below: WEBSITE: http://www.videoworkbench.com AMAZON: https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Dinstant-video&field-keywords=Jason+Gares&rh=n%3A2858778011%2Ck%3AJason+Gareskeywords=video+workbench+productions VIMEO: https://vimeo.com/videoworkbench CURIOUS: https://curious.com/videoworkbench FACEBOOK: https://www.facebook.com/VideoWorkbenchProductions IMDb: https://www.imdb.com/name/nm7907523/?ref_=nv_sr_1 Copyright © 2018 by Jason C. Gares, Video Workbench Productions, Michael Goetzman & Korgo. All Rights Reserved.
Google Security Services for Android : Mobile Protections at Google Scale (Google Cloud Next '17)
 
49:56
Google SafetyNet and Verify Apps protects over 1 billion Android devices with built-in endpoint security services, anti-virus, and protection for lost and stolen devices. Watch this video to learn about how these systems work, and how to best incorporate them into your enterprise and applications. Missed the conference? Watch all the talks here: https://goo.gl/c1Vs3h Watch more talks about Mobility & Devices here: https://goo.gl/yl1EqP
Views: 3464 Google Cloud Platform
BitCoin Mining - Crypto Academy Lecture 5
 
31:53
Welcome to Crypto Academy Lecture 5. This lecture will focus on How BitCoins are Mined. Specific topics to include: * The task of Bitcoin miners * Mining hardware * Energy consumption & ecology * Mining pools * Mining incentives and strategies Thanks for watching. Subscribe and Hit that Bell Notification for all the Latest 👍👍👍 Support The Channel 👍👍👍 SubScribe Now : https://www.youtube.com/HOWHEDOIT?sub_confirmation=1 Buy Crypto @ CoinBase: https://www.coinbase.com/join/59f9eceabdc92c00d4d9a1df Track Your Taxes: https://cointracking.info?ref=M758326 Free BitCoin: https://freebitco.in/?r=13981142 (Dice Faucet) Discord With Me: https://discord.gg/8RdCcd6 Tweet With Me: https://twitter.com/BitcoinSLO Trade With Me: https://www.binance.com/?ref=16159030 ★★★ My Favorite CryptoSites ★★★ BitScreener: https://bitscreener.com/ TradingView Charts: https://www.tradingview.com/markets/cryptocurrencies/ CoinDesk News: https://www.coindesk.com/ Password Generator: (Creates Strong passes): https://passwordsgenerator.net/ 💰💰💰 Tips 💰💰💰 Donate RavenCoin [RVN]: RGQvqTGxkJMqF6opKptwuJKvWUNZohZBcu Donate DogeCoin [DOGE]: DKgESL2CPHh9BqRPa9NaSy6CczqEFgJCJQ Donate Verge [XVG]: DJgDAFd7uhdiRtGASZoNmnG6UjDJ1ifAZX ❗️❗️❗️ DISCLAIMER ❗️❗️❗️ The content in this video references an opinion and is for information and entertainment purposes only. It is not intended to be investment advice. Seek a duly licensed professional for investment advice. Edited With : Camtasia
Views: 32 HowHeDoIt
Avalanche, Nakamoto and Classical Consensus | AMA with Emin Gun Sirer | TruStory (2019)
 
58:53
Preethi chats with Emin Gun Sirer about Avalanche, Nakamoto, and Classical consensus protocols. Join the TruStory Expert Community today https://boards.greenhouse.io/trustory... Discussion Outline Emin on his approach in designing Karma vs. Satoshi Nakamoto’s construction of Bitcoin and what Satoshi did better [03:33] Question: what do you think is the main narrative that Bitcoin sold to end users? [05:27] Emin's reasoning for getting into Bitcoin [09:10] Why hybridization efforts of Nakamoto and classical consensus protocols cannot be successful and possibly lend to a situation of having “the worst of both worlds” [12:42] Emin explains why, in reference to consensus protocol families, Avalanche is “the best of both worlds” [16:42] Avalanche consensus protocol and Sybil-resistant mechanisms [22:39] Question: is AVA Coin going to be its own sovereign chain? [25:19] The Lindy effect; potential ways Bitcoin can be unseated [25:26] Why Emin disagrees that, within a distributed system, there is always a trade-off based on optimized focus [29:56] AVA Coin’s governance mechanism [32:51] Question: how can you incentivize users to participate in the governance of systems they use? [35:00] Emin states why AVA embraces the Calm Design philosophy [35:35] Question: Emin, you mentioned censorship resistance in Bitcoin is quite weak. I was wondering if you can elaborate on that? I always thought of it as one of its strengths [40:28] Question: I have a question about scaling. Right now we have Layer 2 solutions and also the approaches on what Cosmos and Polkadot are doing. What are you thoughts on these; do you think there is enough room for both? [43:14] Emin explains the downsides of using Layer 2 solutions in blockchain technology [44:51] Question: what are your thoughts on the approach on what Cosmos and Polkadot are doing? [48:28] Question: you said that, there is no slashing. However, in someone of the background readings, they say that if there is a double spend, the money will just disappear? [49:02] Question: what do you think is being totally under-hyped in the crypto space? [52:50] Emin’s closing thoughts on the SEC, ETF proposals, Wall Street, building self-assuring technology and why the dynamics between the crypto world and the rest of the world [56:24] View More TruStroy AMAs: Cosmos vs. Polkadot: https://www.youtube.com/watch?v=DhVJOHuP62E&t=1182s Stablecoin Cryptocurrencies | AMA with Haseeb Qureshi | TruStory (2019): https://www.youtube.com/watch?v=H1TOfnvbiZ0 View TruStory Study Sessions: How Does Proof of Work Work?: https://www.youtube.com/watch?v=7WDHYcVrU9g&t=3s How Does Proof of Stake Work?: https://www.youtube.com/watch?v=OwB_Ayo-zNY&t=3s What Made Bitcoin Work? https://www.youtube.com/watch?v=WndYl3wUzYM&t=3030s Distributed Systems & Consensus:https://www.youtube.com/watch?v=WndYl3wUzYM&t=3030s Bitcoin White Paper Review: https://www.youtube.com/watch?v=FObEIGF4Rd0&t=205s Connect With Us: If you have questions, post em to our Discourse: https://discourse.trustory.io/ Have questions? Post them to our Discourse: https://discourse.trustory.io/ Find iffy claims? Tag us on Twitter: https://twitter.com/isTrustory Looking for updates on TruStory? Check out our website: https://www.trustory.io/
Views: 185 Experts @ TruStory
BitCoin Puzzles - Crypto Academy Lecture 8
 
44:59
Welcome to Crypto Academy Lecture . This lecture will focus on Specific topics to include: * Essential Puzzle Requirements * ASIC Resistant Puzzles * Proof-of-useful-work * Nonoutsourceable Puzzles * Proof-of-Stake Thanks for watching. Subscribe and Hit that Bell Notification for all the Latest 👍👍👍 Support The Channel 👍👍👍 SubScribe Now : https://www.youtube.com/HOWHEDOIT?sub_confirmation=1 Buy Crypto @ CoinBase: https://www.coinbase.com/join/59f9eceabdc92c00d4d9a1df Track Your Taxes: https://cointracking.info?ref=M758326 Free BitCoin: https://freebitco.in/?r=13981142 (Dice Faucet) Discord With Me: https://discord.gg/8RdCcd6 Tweet With Me: https://twitter.com/BitcoinSLO Trade With Me: https://www.binance.com/?ref=16159030 ★★★ My Favorite CryptoSites ★★★ BitScreener: https://bitscreener.com/ TradingView Charts: https://www.tradingview.com/markets/cryptocurrencies/ CoinDesk News: https://www.coindesk.com/ Password Generator: (Creates Strong passes): https://passwordsgenerator.net/ 💰💰💰 Tips 💰💰💰 Donate RavenCoin [RVN]: RGQvqTGxkJMqF6opKptwuJKvWUNZohZBcu Donate DogeCoin [DOGE]: DKgESL2CPHh9BqRPa9NaSy6CczqEFgJCJQ Donate Verge [XVG]: DJgDAFd7uhdiRtGASZoNmnG6UjDJ1ifAZX ❗️❗️❗️ DISCLAIMER ❗️❗️❗️ The content in this video references an opinion and is for information and entertainment purposes only. It is not intended to be investment advice. Seek a duly licensed professional for investment advice. Edited With : Camtasia Tags howhedoit,cryptoslo,yt:cc=on
Views: 32 HowHeDoIt
What is the Bitcoin Block Height?
 
03:14
What is the "Height" of a transaction in Bitcoin, and why does this matter? What does the height of a block or transaction mean to end users and developers? In this video, shot in West Broward, I answer this question and discuss all things Bitcoin.
Views: 1002 Bitcoin Uncensored
Hashcash
 
12:26
Hashcash is a proof-of-work system used to limit email spam and denial-of-service attacks, and more recently has become known for its use in bitcoin as part of the mining algorithm. Hashcash was proposed in May 1997 by Adam Back. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 3021 Audiopedia
session35
 
35:46
Proof of Stake vs Poof of Work Introduction - Vitalik Buterin
 
26:50
Vitalik Buterin’s “Mauve Revolution” presentation, is the culmination of months of in-depth research and development work. His presentation was well received, and it was reassuring to know that the preparations for proof-of-stake (PoS) are at an advanced stage. The transition from proof-of-work (PoW) to proof-of-stake (PoS) is important work, not without risk, and crucial to get right. Thankfully, Vitalik Buterin and his highly capable team are in charge of this pioneering work, and there is no reason why the implementation won’t succeed in achieving its design goals. The Ethereum Foundation has a great track record of meeting software development goals and responding correctly and quickly under pressure. Therefore, they will take their time releasing Casper and hold off if necessary. But once done, it will be a significant advancement for Ethereum and the blockchain ecosystem. 🙏Thank you so much for spending your time to watch this video and please don't forget to LIKE & SUBSCRIBE. See you in the next video.✌ I Hope you enjoyed the video. If so, please share it with your friends and family. 😎Stay up to date with today's revolutionary Blockchain Technology by subscribing to my channel and always get the most recent updates by ringing the bell. On this channel, you will watch Bitcoin & other Cryptocurrency News, Technical Analysis, Trading Tips, Trading Signals, and Price Predictions. ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● 🙏I will appreciate any donations to my channel. Every little bit helps. Thank You! 🙂 ✔️₿ITCOIN 1CKFuEeqzQR8Bv9cvVjtxFbnZkPueiRJwr ✔️ LITECOIN LcmJTKEz4LmZ7j7UaKCFB6zdmH2vKzWWyS ✔️ ETHEREUM 0x4cbe86df99bcd89b2016c3892e52c8fb9d4dc6c8 ✔️XRP rKfzfrk1RsUxWmHimWyNwk8AoWHoFneu4m/ Destination Tag: 963444220 ✔️DASH XukafF46YdoRvgYDHWJQHtFakZvcZtTQjD ✔️PayPal: paypal.me/BitcoinCryptoShow ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● 🚩 DISCLAIMER: This video and description may contain affiliate links, which means that if you click on one of the product links, I’ll receive a small commission. This helps support the channel and allows us to continue to make videos like this. Thank you for the support! £(AMAZON LINKS TO THE *BEST* DEALS)£ 💙 Yubico security key https://amzn.to/2QNLfjB 💙 Yubico YubiKey 4 - USB-A, Two Factor Authentication Security Key, black https://amzn.to/2QLdbob 💙 The End of Money: The story of bitcoin, cryptocurrencies and the blockchain revolution (New Scientist Instant Expert) https://amzn.to/2NsZTia 💙 Just HOLD It Cryptocurrency T-Shirt Bitcoin Ethereum Litcoin Ripple BTC (Black, XL) https://amzn.to/2QLl1hv 💙 Indy Visuals Litecoin Cryptocurrency Premium T-Shirt ETH Money XRP Bitcoin Ripple Iota S-5XL - Sports - XL https://amzn.to/2OEcPy1 💙 In Crypto We Trust Bitcoin Cryptocurrency T-shirt https://amzn.to/2xG0gLE 💙 Ethereum ETH Cryptocurrency Tee Shirt https://amzn.to/2xqvYNg ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● RECOMMENDED CRYPTO EXCHANGES: If you're looking to start buying Bitcoin, Coinbase is the preferred and safest option available to the US and Europe. ▶Please join Coinbase using this link for free $10: https://www.coinbase.com/join/5a3a545548cb6402f3cf7c39 Coinmama is one of the best exchange to buy Bitcoin and Ethereum with credit card in the fastest, easiest and safest way online! Buying BTC and ETH in 3 simple steps at Coinmama. ▶COINMAMA: http://go.coinmama.com/visit/?bta=53190&nci=5343 To start buying alt coins, Binance IS THE BEST altcoin exchange out there. Please join Binance using this link: ▶https://www.binance.com/?ref=13180000 ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● COLD STORAGE WALLETS TO SECURE YOUR CRYPTOS. 🔒 Trezor: https://shop.trezor.io?a=toksfmgl 🔒 Ledger Nano: https://www.ledger.com?r=2964dc525816 🔒 Ellipal: http://order.ellipal.com/?ref=bitcoincryptoshow 🔒 CoolWallet: https://coolwallet.io/product/coolwallet/?ref=migueladon ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● 🌎 Follow me on Twiter: https://twitter.com/BitcoinCryptoSh ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● 📌DISCLAIMER: This is not Financial Advice, and We are not Financial Advisers, And These are merely the opinions of YouTubers. SOURCE: CoinMarketCap
Views: 69 BitcoinCryptoShow
Bitcoin and Blockchain basics
 
15:42
Concise introduction to Bitcoin and Blockchain
Views: 514 Ravi Nalliyappa
Google Apps Unscripted - July 2013
 
32:30
Join us for our monthly Google Apps Unscripted GDL. During this session, we will cover the latest updates from the Apps Script team and leave plenty of time for Q&A.
Views: 4802 Google Developers
BitCoin Mining - Crypto Academy Lecture 5
 
31:53
Welcome to Crypto Academy Lecture 5. This lecture will focus on How BitCoins are Mined. Specific topics to include: * The task of Bitcoin miners * Mining hardware * Energy consumption & ecology * Mining pools * Mining incentives and strategies Thanks for watching. Subscribe and Hit that Bell Notification for all the Latest 👍👍👍 Support The Channel 👍👍👍 SubScribe Now : https://www.youtube.com/HOWHEDOIT?sub_confirmation=1 Buy Crypto @ CoinBase: https://www.coinbase.com/join/59f9eceabdc92c00d4d9a1df Track Your Taxes: https://cointracking.info?ref=M758326 Free BitCoin: https://freebitco.in/?r=13981142 (Dice Faucet) Discord With Me: https://discord.gg/8RdCcd6 Tweet With Me: https://twitter.com/BitcoinSLO Trade With Me: https://www.binance.com/?ref=16159030 ★★★ My Favorite CryptoSites ★★★ BitScreener: https://bitscreener.com/ TradingView Charts: https://www.tradingview.com/markets/cryptocurrencies/ CoinDesk News: https://www.coindesk.com/ Password Generator: (Creates Strong passes): https://passwordsgenerator.net/ 💰💰💰 Tips 💰💰💰 Donate RavenCoin [RVN]: RGQvqTGxkJMqF6opKptwuJKvWUNZohZBcu Donate DogeCoin [DOGE]: DKgESL2CPHh9BqRPa9NaSy6CczqEFgJCJQ Donate Verge [XVG]: DJgDAFd7uhdiRtGASZoNmnG6UjDJ1ifAZX ❗️❗️❗️ DISCLAIMER ❗️❗️❗️ The content in this video references an opinion and is for information and entertainment purposes only. It is not intended to be investment advice. Seek a duly licensed professional for investment advice. Edited With : Camtasia
Views: 5 CryptoSLO
Bitcoin, What is bitcoin, How to bitcoin  bitcoin cash kurs,  bitconnect
 
12:00
Bitcoin, What is bitcoin, How to bitcoin bitcoin cash kurs, bitconnect Bitcoin is a cryptocurrency and worldwide payment system. It is the first decentralized digital currency, as the system works without a central bank or single administrator. Bitcoin cash is a currency unit designed to speed up bitcoin payment transactions. Anybody who owns Bitcoin also has bitcoin cash. To pay faster with Bitcoin you can use the bitcoin currency. This decision is entirely up to you. Let's not forget, the Bcash term is not considered a proper naming. The network is peer-to-peer and transactions take place between users directly through the use of cryptography, without an intermediary These transactions are verified by network nodes and recorded in an immutable public distributed ledger called a blockchain. Bitcoin was invented by an unknown person or group of people under the name Satoshi Nakamoto and released as open-source software in 2009 Bitcoins are created as a reward for a process known as mining. They can be exchanged for other currencies,[12] products, and services. Mining is a record-keeping service done through the use of computer processing power.[d] Miners keep the blockchain consistent, complete, and unalterable by repeatedly verifying and collecting newly broadcast transactions into a new group of transactions called a block.[46] Each block contains a cryptographic hash of the previous block,[46] using the SHA-256 hashing algorithm,[3]:ch. 7 which links it to the previous block,[46] thus giving the blockchain its name. Miners may aggregate mining resources in a mining pool. To be accepted by the rest of the network, a new block must contain a so-called proof-of-work.[46] The proof-of-work requires miners to find a number called a nonce, such that when the block content is hashed along with the nonce, the result is numerically smaller than the network's difficulty target.[3]:ch. Every 2,016 blocks (approximately 14 days at roughly 10 min per block), the difficulty target is adjusted based on the network's recent performance, with the aim of keeping the average time between new blocks at ten minutes. In this way the system automatically adapts to the total amount of mining power on the network.[3]:ch. 8 Between 1 March 2014 and 1 March 2015, the average number of nonces miners had to try before creating a new block increased from 16.4 quintillion to 200.5 quintillion.[54] Bitcoin has been labelled a speculative bubble by many including former Fed Chairman Alan Greenspan[155] and economist John Quiggin.[156] Nobel Memorial Prize laureate Robert Shiller said that bitcoin "exhibited many of the characteristics of a speculative bubble".[157] Journalist Matthew Boesler in 2013 rejected the speculative bubble label and saw bitcoin's quick rise in price as nothing more than normal economic forces at work.[158] Timothy B. Lee, in a 2013 piece for The Washington Post pointed out that the observed cycles of appreciation and depreciation don't correspond to the definition of speculative bubble.[133] On 14 March 2014, the American business magnate Warren Buffett said, "Stay away from it. It's a mirage, basically."[159] The price of bitcoins has gone through various cycles of appreciation and depreciation referred to by some as bubbles and busts.[131][132] In 2011, the value of one bitcoin rapidly rose from about US$0.30 to US$32 before returning to US$2.[133] In the latter half of 2012 and during the 2012–13 Cypriot financial crisis, the bitcoin price began to rise,[134] reaching a high of US$266 on 10 April 2013, before crashing to around US$50.[135] On 29 November 2013, the cost of one bitcoin rose to a peak of US$1,242.[136] In 2014, the price fell sharply, and as of April remained depressed at little more than half 2013 prices. As of August 2014 it was under US$600.[137] According to Mark T. Williams, as of 2014, bitcoin has volatility seven times greater than gold, eight times greater than the S&P 500, and 18 times greater than the US dollar.[138] According to Forbes, there are uses where volatility does not matter, such as online gambling, tipping, and international remittances.[139] In January 2015, noting that the bitcoin price had dropped to its lowest level since spring 2013 – around US$224 – The New York Times suggested that "[w]ith no signs of a rally in the offing, the industry is bracing for the effects of a prolonged decline in prices. bitcoin,bitcoin cash kurs,bitcoin mining,bitcoin price,bitcoin usd,buy bitcoin,what is bitcoin,how to buy bitcoin cash,que es el bitcoin,bitcoin diamond,bitcoin gold wallet,how to mine bitcoin at home,cboe bitcoin,buys bitcoin once,bitzeny,bitcoin blase,le bitcoin,how to bitcoin,bitcoin explained,bitcoin in hindi,cryptocurrency,blockchain,cryptocurrencies,bitcoin millionaire,Cryptocurrency Mining,virtual currency
Views: 149 maximum personnel
CS169 v13 w12l1s3
 
11:43
Views: 1155 saasbook
Assassins Creed Odyssey - Easter Eggs | Ubisoft-TV [DE]
 
03:17
Von der Rückkehr des Einhorns bis zu Riesenschlangen und ... Battle Royale? Unser Easter-Egg-Video zu Assassin's Creed Odyssey deckt die verrücktesten Anspielungen und Geheimnisse des Spiels auf. Jetzt kaufen: https://store.ubi.com/de/assassin-s-creed-odyssey SCHÖNE FAKTEN: Das Spiel ist seit dem 05. Oktober 2018 für PlayStation®4, PC, Xbox One, Xbox One S sowie für Xbox One X erhältlich. ► HIER KAUFEN: https://store.ubi.com Folgt uns: ► Offizielle Webseite: http://www.assassinscreed.com ► YouTube: https://www.youtube.com/AssassinsCreedDE ► Twitter: https://twitter.com/Assassins_UK ► Instagram: https://www.instagram.com/ubisoftde ► Pinterest: http://www.pinterest.com/ubisoftde ► Twitch: https://www.twitch.tv/assassinscreed ► Facebook: https://www.facebook.com/assassinscreed/ ► Mehr von Ubisoft gibt es unter: http://www.ubisoft.com
Views: 10937 UbisoftDE | UbisoftTV