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Search results “smart contracts” for the 2017
Smart contracts - Simply Explained
 
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What are smart contracts and what do they have to do with blockchains and cryptocurrencies? Well, let's find in plain English! 💰 Want to buy Bitcoin or Ethereum? Buy for $100 and get $10 free (through my affiliate link): https://www.coinbase.com/join/59284524822a3d0b19e11134 🐦 Follow me on Twitter: https://twitter.com/savjee ✏️ Check out my blog: https://www.savjee.be 👍🏻 Like my Facebook page: https://www.facebook.com/savjee 📚 Sources can be found on my website: https://www.savjee.be/videos/simply-explained/smart-contracts/
What is a Smart Contract? A Beginner’s Guide
 
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What is a Smart Contract? A Beginner’s Guide You'll receive $10 in free bitcoin by signing up with this link http://bit.ly/2oesV41 Bitcoin & Etherum Storage Wallet: http://bit.ly/2o7BmgW Book Recommendations: http://amzn.to/2pv7kF4 Get One-to-One Consulting https://clarity.fm/ameerrosic Blockchain Training: http://bit.ly/2nGhdn0 Quadrigacx Canadian Crypto Exchange: http://bit.ly/2papyuV What are Smart Contracts? Smart contracts help you exchange money, property, shares, or anything of value in a transparent, conflict-free way, while avoiding the services of a middleman. The best way to describe smart contracts is to compare the technology to a vending machine. Ordinarily, you would go to a lawyer or a notary, pay them, and wait while you get the document. With smart contracts, you simply drop a bitcoin into the vending machine (i.e. ledger), and your escrow, driver’s license, or whatever drops into your account. More so, smart contracts not only define the rules and penalties around an agreement in the same way that a traditional contract does, but also automatically enforce those obligations. Example Suppose you rent an apartment from me. You can do this through the blockchain by paying in cryptocurrency. You get a receipt which is held in our virtual contract; I give you the digital entry key which comes to you by a specified date. If the key doesn’t come on time, the blockchain releases a refund. If I send the key before the rental date, the function holds it releasing both the fee and key to you and me respectively when the date arrives. The system works on the If-Then premise and is witnessed by hundreds of people, so you can expect a faultless delivery. If I give you the key, I’m sure to be paid. If you send a certain amount in bitcoins, you receive the key. The document is automatically cancelled after the time, and the code cannot be interfered by either of us without the other knowing, since all participants are simultaneously alerted. You can use smart contracts for all sort of situations that range from financial derivatives to insurance premiums, breach contracts, property law, credit enforcement, financial services, legal processes and crowd funding agreements. My name is Ameer Rosic, and I'm a serial entrepreneur, investor, marketing Strategist and Blockchain Evangelist Blog http://www.Ameerrosic.com Blockgeeks: http://www.blockgeeks.com Facebook http://www.Facebook.com/ameerrosic Twitter http://www.Twitter.com/ameerrosic InstaGram http://www.Instagram.com/ameerrosic
Views: 179426 Ameer Rosic
Как создать Smart Contract в блокчейне Ethereum: собственная рекламная криптовалюта LoneCoin
 
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Курсы по разработке на Ethereum: http://ethereumworks.com/?ch=yts&utm_source=yts&utm_medium=youtubesl&utm_campaign=youtubesl&utm_term=youtubesl. Телеграм чат для разработчиков: https://t.me/smart_contracts_dev; Самые свежие новости и статьи по криптокодингу - https://t.me/cryptocoding_news Как создать и запустить smart contract в блокчейне Эфириума. В видео приводится пример создания простейшей криптовалюты в тестовой сети. Geth - https://github.com/ethereum/go-ethereum/wiki/geth. Mist - https://github.com/ethereum/mist. Исходный код криптовалюты - https://www.ethereum.org/token. Музыка - https://soundcloud.com/dj-mur/foxy-paramour-mix-01102014. Cвязаться со мной можно через Skype - v.poskonin (Mouse Po). Канал можно поддержать отправив донат на кошелек Ethereum: 0x9740Cd40296744a0aE2aFD115933a791Da4c2AD8, биткоин: 17Zs1nhgBB92CeCxFbbB7WhT9MdypJAj1d
Ethereum in Depth: Smart Contracts - Part 1: What is a Smart Contract?
 
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Part 2: https://www.youtube.com/watch?v=TC-bDQZbXd0 In this video I give an introduction to smart contracts in ethereum. First I explain what accounts are in a simpler currency only blockchain. Then I show how ethereum introduces a second type of account: a code controlled account (aka smart contract). This type of account does not have a private key but instead is controlled by code. It can store ether, just like user accounts, or it can keep a balance of 0 and be used to deliver some other function within the context of an application. I then give examples of how you can use smart contracts. If you want to tip this video here is an ethereum address for this video: 0xd6d1f455814211e3a79a03faa7bc18c74ca9163c
Views: 79541 Kevin Healy
What are Blockchain Smart Contracts?
 
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More and more apps will start using smart contract technology to enable never before possible features. We're going to build a smart contract called "proof of existence" that acts as a digital notary for any document using the Ethereum blockchain. Code for this video: https://github.com/llSourcell/proof_of_existence_demo Please Subscribe! And like. And comment. Thats what keeps me going. Follow me on: Twitter: https://twitter.com/sirajraval Facebook: https://www.facebook.com/sirajology/ More learning resources: https://www.slideshare.net/intrins1k/ethereum-meetup-presentation-01042017-70716809 https://www.youtube.com/watch?v=R_CiemcFKis https://auth0.com/blog/an-introduction-to-ethereum-and-smart-contracts-part-2/ https://ethereumdev.io/ https://ethereum.gitbooks.io/frontier-guide/content/writing_contract.html http://hypernephelist.com/2016/06/01/deploying-my-first-smart-contract.html https://blog.cloudboost.io/ethereum-smart-contracts-in-a-nutshell-for-hackers-64f357715791 http://www.techracers.com/smart-contract-solidity http://ecomunsing.com/tutorial-controlling-ethereum-with-python Join us in the Wizards Slack channel: http://wizards.herokuapp.com/ And please support me on Patreon: https://www.patreon.com/user?u=3191693 Instagram: https://www.instagram.com/sirajraval/ Instagram: https://www.instagram.com/sirajraval/
Views: 33428 Siraj Raval
Андрей Соболь - Smart contracts
 
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http://btc-alpha.com/ - надежная криптобиржа https://www.facebook.com/btcalpha/ https://vk.com/btcalpha https://telegram.me/btcalpha - чат https://www.instagram.com/btcalpha
Views: 3459 BTC-Alpha
What is a Smart Contract?
 
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In this video I explain smart contracts and explore several popular projects that implement them including Ethereum, EOS, Tezos and RootStock. Link to video on what it means to be "Turing Complete": https://www.youtube.com/watch?v=RPQD7-AOjMI ### Find the video helpful? ### Support my work and get access to exclusive perks on Patreon: https://www.patreon.com/ummjackson ### Follow me on Twitter ### https://twitter.com/ummjackson Music: "Tony's Belated Breakfast" by Birocratic (http://birocratic.lnk.to/allYL)
Views: 9420 Jackson Palmer
Smart Contracts in Business: Sergey Nazarov of SmartContract.com Shares
 
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http://www.terrybrock.com Smart contracts are a tool that use blockchain technology to decrease friction and enhance both security and reliability in business transactions. I find this area to be as important,, or even more important, than all the good that is happening with cryptocurrencies like bitcoin and more. In this interview I talk with Sergey Nazarov, the CEO of SmartContract.com (cool name, huh?). He shares real-world examples of how this technology is changing the way businesses do business in finance, transportation and more. The possibilities are enormous and this is something you want to know. Please leave your comments below and share this with others. They can benefit a lot from it. Also, please subscribe so you get more videos like this and get a competitive advantage knowing what is possible. Terry Brock is a Marketing & Technology Keynote Speaker who gives real-world, practical tips on how to generate revenue and increase productivity. He's the former Chief Enterprise Blogger for Skype, former Editor-in-Chief for AT&T's top-rated blog, and is co-author of the best-selling McGraw-Hill book about social media, "Klout Matters." He's an international Speaker Hall of Fame inductee and travels around the world helping business leaders connect with their customers building relationships and increasing business.
Views: 6457 TerryL Brock
02. Solidity Variables and Types (Smart Contract Tutorial)
 
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Free Course Page (In development): https://goo.gl/EiKpPP Written tutorial of this video: https://goo.gl/quFV8P https://coursetro.com This video is the 2nd lesson from my 100% free course: "Developing Ethereum Smart Contracts for Beginners" Check it out here: https://goo.gl/EiKpPP In this video, you're going to learn about the basics of the Remix IDE, how to define variables along with their different types in Solidity, and also how to set variables. https://coursetro.com https://www.facebook.com/coursetro/ - - - - - - - - - - - - - - - - - - - - - - Subscribe for NEW VIDEOS every Monday-Thursday @ 10:30 AM ET! My site: https://coursetro.com My personal FB account: http://fb.com/logodesigner Coursetro FB: http://fb.com/coursetro Coursetro's Twitter: http://twitter.com/designcoursecom Join my Discord! https://discord.gg/a27CKAF ^-Chat with me and others - - - - - - - - - - - - - - - - - - - - - - Who is Gary Simon? Well, I'm a full stack developer with 2+ decades experience and I teach people how to design and code. I've created around 100+ courses for big brands like LinkedIn, Lynda.com, Pluralsight and Envato Network. Now, I focus all of my time and energy on this channel and my website Coursetro.com. Come to my discord server or add me on social media and say Hi!
Views: 22687 DesignCourse
DEF CON 25 - Konstantinos Karagiannis - Hacking Smart Contracts
 
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It can be argued that the DAO hack of June 2016 was the moment smart contracts entered mainstream awareness in the InfoSec community. Was the hope of taking blockchain from mere cryptocurrency platform to one that can perform amazing Turing-complete functions doomed? We've learned quite a lot from that attack against contract code, and Ethereum marches on. Smart contracts are a key part of the applications being created by the Enterprise Ethereum Alliance, Quorum, and smaller projects in financial and other companies. Ethical hacking of smart contracts is a critical new service that is needed. And as is the case with coders of Solidity (the language of Ethereum smart contracts), hackers able to find security flaws in the code are in high demand. Join Konstantinos for an introduction to a methodology that can be applied to Solidity code review ... and potentially adapted to other smart contract projects. We'll examine the few tools that are needed, as well as the six most common types of flaws, illustrated using either public or sanitized real world" vulnerabilities.
Views: 5899 DEFCONConference
What is a Smart Contract?
 
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Smart contracts are a major and exciting new development in finance and computer science, and this six minute explainer will break down the complex science to tell you what you need to know about them! We discuss Ethereum smart contracts, monero, and bitcoin contracts. Contracts are divided into turing complete, and turing incomplete models. And examples of what can be developed with each type are discussed. Now that eos and tezos have ICO'd, the future for smart contracts is as bright as its ever been. Watch to find out more!
Views: 4271 Bitcoin Uncensored
Ethereum in Depth: Smart Contracts - Part 2: How to Create and Publish a Smart Contract
 
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Mist Download Link: https://github.com/ethereum/mist/releases Solidity Documentation: http://solidity.readthedocs.io/en/develop/ Remix IDE: https://remix.ethereum.org/ Rinkeby Testnet Faucet: https://faucet.rinkeby.io [!Outdated!] Faucet How To: https://www.youtube.com/watch?v=wKFz5c3TU4s PLEASE NOTE: in order to get testnet ether just follow the directions on the faucet's website (link above) instead of this how to video. Instead of using GitHub gists, you now just post your address from one of your social media pages. (It will probably be easier for you than it was before) The reason they require you to do that is to prevent people from acquiring so much testnet ether that one could run attacks on the network... You're limited to like 20 ether every 3 days which is more than enough for testing. --- In this video we create a sample smart contract that will split any ether that is sent to it equally between 5 addresses. It can be used as a simple payroll contract. Each of the 5 addresses are our pretend employees that will call the 'withdraw' function to "collect their paycheck". Everything takes place on the test network. If you want to tip this video here is an ethereum address for this video: 0x631781ec9b44c7b5c4e9ea47fa122825f6c7a0c6
Views: 56228 Kevin Healy
The Future of the Blockchain with Smart Contracts and Ethereum
 
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The founder of Ethereum talks to Tech Crunch.
Views: 1686 Michael Spencer
How to write smart contracts on Ethereum - Programmer explains
 
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How to write smart contracts in Solidity on Ethereum. https://steemit.com/@ivanli
Views: 35458 Ivan on Tech
What are Smart Contracts & What is their function?
 
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Explained by the creator of Ethereum, Vitalik Buterin. Video from TechCrunch: https://techcrunch.com/
01. Smart Contracts and Decentralized Apps 101
 
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Free Course Page (In development): https://goo.gl/EiKpPP Written tutorial of this video: https://goo.gl/nxzDf1 The 2 video resources I referenced that you *should* watch if you're confused on the blockchain: https://www.youtube.com/watch?v=bBC-nXj3Ng4 https://www.youtube.com/watch?v=_160oMzblY8 Welcome to the very first lesson in my free course, "Developing Ethereum Smart Contracts for Beginners". In this lesson, you're going to learn about the very basics of what a blockchain are, smart contracts and decentralized apps. Throughout this course, you're going to use the web-based IDE "Remix" to learn all about contracts. At the end, you will even deploy your own contract to the live ethereum blockchain. If you're actively following the progress of this course, I will strive to release a new lesson every 2 to 3 days. https://coursetro.com https://www.facebook.com/coursetro/ - - - - - - - - - - - - - - - - - - - - - - Subscribe for NEW VIDEOS every Monday-Thursday @ 10:30 AM ET! My site: https://coursetro.com My personal FB account: http://fb.com/logodesigner Coursetro FB: http://fb.com/coursetro Coursetro's Twitter: http://twitter.com/designcoursecom Join my Discord! https://discord.gg/a27CKAF ^-Chat with me and others - - - - - - - - - - - - - - - - - - - - - - Who is Gary Simon? Well, I'm a full stack developer with 2+ decades experience and I teach people how to design and code. I've created around 100+ courses for big brands like LinkedIn, Lynda.com, Pluralsight and Envato Network. Now, I focus all of my time and energy on this channel and my website Coursetro.com. Come to my discord server or add me on social media and say Hi!
Views: 21561 DesignCourse
Solidity Tutorial Part 1 - Smart contracts on Ethereum - Hello World
 
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Video series about the language solidity, for creating smart contracts on ethereum blockchain, ICOs and Decentralized Autonomous Organizations. On this video, we will have a simple hello world contract, as an introduction for solidity remix browser IDE, here you will see the most basic stuff of solidity, and would settle the base to start developing much more interesting smart contracts, ICO`s or Decentralized Autonomous Organizations. Github Repository: https://github.com/magonicolas/Ethereum-Solidity @magonicolas Ether - Donaciones / Donations 0x23a46389f350cac832e8faed0334bc1aaf0c4a79 Bitcoin - Donaciones / Donations 17tVDECS6Q4d5zpqcLmpKostNfAJkhYFvt
Views: 3677 Nicolas Palacios
¿Cómo utilizar Smart Contracts en Blockchain? Carlos Vivas
 
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http://libroblockchain.com/ Carlos Vivas Augier firma el capítulo del libro dedicado a las “Aplicaciones transversales de la blockchain” donde no puede faltar el concepto de Smart Contracts o Contratos Inteligentes y sus aplicaciones presentes y otras futuras, más cercanas a la ciencia ficción. En la siguiente entrevista, Alex Preuskchat pregunta a Carlos sobre todas las posibilidades que encierra este concepto tan transversal. El concepto de Smart contract es aparentemente sencillo, si nos guiamos por la definición básica de contrato que todos tenemos en mente, un compromiso entre distintas partes que obliga a los contrayentes y cuyo incumplimiento es exigible. Sin embargo, un Smart contract incorpora tres diferencias importantes, la primera es que “se auto ejecuta”, es decir no necesitas de la intervención de un tercer ente “para validar si las condiciones se han cumplido o no”, porque el contrato es suficientemente inteligente para ejecutar esta función “y decidir si se han cumplido las condiciones y clausulas” y por tanto “cómo proceder”. La segunda es donde reside el documento, que ya no tiene un formato de papel al uso, sino que “existe digitalmente en la cadena de bloques” y por último, que no requiere de un tercero, “de un humano” para realizar estas validaciones. Pero esta primera definición es muy superficial y sirve para definir los proyectos van surgiendo en la actualidad pero “en el futuro irá mucho más allá y la palabra contrato no será la más adecuada” por las propias limitaciones que tiene y que son ampliamente superadas por el concepto y las posibilidades de un Smart contract, así que podría ser más ajustado hablar en el futuro de “más bien como una especie de agente virtual e inteligente que va a regular muchas cosas, desde las relaciones de los directivos de una empresa hasta nuestras relaciones con los proveedores del servicio de telefonía…” Para Vivas, “la ventaja de una tecnología descentralizada es que permite desarrollos muy interesantes y muy
Views: 7145 Libro Blockchain
34C3 -  cryptocurrencies, smart contracts, etc.: revolutionary tech?
 
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https://media.ccc.de/v/34c3-9240-cryptocurrencies_smart_contracts_etc_revolutionary_tech short answer: Yes! Bitcoin arrived eight years ago, and has now spawned a dazzling array of follow-on technologies, including smart contracts, censorship-resistant computation, trustless databases (“blockchains”) and more. This talk attempts to highlight a few of the most significant developments in both technology and in society's response to it, including some nation-state governments banning cryptocurrencies and/or launching their own cryptocurrencies. This talk will briefly summarize in broad strokes what previously-impossible technologies have now been proven and deployed (starting with Bitcoin), as well as the general outlines of nascent technologies are currently under development. It will also briefly outline the evolution of the market and the social response to these technologies, such as the ICO boom and the varying reactions of different populations and governments. It will also draw out a few examples that illustrate the situation in more detail, such as the recent crackdown by the Chinese government, the deployment and evolution of Ethereum, and the massive investment into new technologies which is being fueled by the ICO boom. Zooko https://fahrplan.events.ccc.de/congress/2017/Fahrplan/events/9240.html
Views: 3631 media.ccc.de
Deep Dive: Ethereum and Smart Contracts
 
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This was an introduction to Ethereum lecture presented at the beginning of our Ethereum Deep Dive on June 17. Lecture slides: goo.gl/6C8oRU Deep Dive document: goo.gl/wk813i
Views: 25174 Blockchain at Berkeley
Smart Contracts in 2 Minutes
 
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Smart Contracts in 2 Minutes: » Wikipedia: https://en.wikipedia.org/wiki/Smart_contract » Investopedia: http://www.investopedia.com/terms/s/smart-contracts.asp » Reddit: https://www.reddit.com/r/smartcontracts/ » Medium (ConsenSys) : https://medium.com/@ConsenSys/unpacking-the-term-smart-contract-e63238f7db65 Recommended Viewing: » “What is a Smart Contract?” by Ameer Rosic (9 min.) - https://www.youtube.com/watch?v=qdoUpGg_DpQ » “Simple Introduction to Smart Contracts on a Blockchain” (5 min.) - https://www.youtube.com/watch?v=FkeLDPZ-v8g
Views: 7293 Cryptografi
What are Smart Contracts? A short and simple explanation
 
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A short and concise explanation of smart contracts and application examples. SUBSCRIBE: http://bit.ly/2zlnx88 ----- Homepage: https://www.draglet.com/ Facebook: https://www.facebook.com/dragletExchange/ Twitter: https://twitter.com/dragletExchange/ Instagram: https://www.instagram.com/draglet/ Google Plus: https://plus.google.com/+dragletGmbHM%C3%BCnchen/ Linkedin: https://www.linkedin.com/company-beta/18031653/ ----- Check out our ICO Servicesl: https://www.draglet.com/ico ----- Our famous bitcoin exchange software: https://www.draglet.com/exchange-software/ --- Our Mailing Address is draglet Gmbh Leonrodstr. 68 80636 Munich, Germany
Views: 1635 draglet
Aula 06 - Criando seu primeiro smart contract!
 
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Neste episódio vamos aprender como escrever um contrato simples na linguagem solidity.
Views: 1787 Block By Block
Beginner's Guide: Smart Contracts Programming Tutorial in Solidity 1
 
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In this video we learn how to write code in Solidity and how to make a simple public Getter
Views: 61299 Vlad Wulf
[ 2 - Formation Cryptos ]  Qu'est-ce qu'un Smart Contract ?
 
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Views: 10766 DMTrading
Hosho- Get Your Smart Contracts Audited / Consensys Alternative (Interview w/ Founder: Hartej)
 
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👍 Thank You Very Much For Watching And Sharing This Video! 😃 Please Hit Like & Subscribe To Not Miss A Beat! ►Official Website: https://hosho.io/ ►🌐Find Us on Steemit (Decentralized Social Media Blockchain): https://goo.gl/K3pQD4 🏆Become A Patron or Sponsor: https://goo.gl/RKYRrN ►🚀Crypt0's Live Streaming Channel: https://goo.gl/xRgnzs 🚩Join The Crypt0's News Group: https://goo.gl/7zxDrt 🚩10% Off Your Anarchapulco Conference Tickets (Purchased After August 30th): Enter Promo Code "crypt0": https://goo.gl/oMUvjd ►💎Donate Ether and Ethereum-Based (ERC-20) Tokens: 0x97f32d97D6Ce4dee3429279F04D5b96Aba7C969B ►💎Donate Bitcoin: 17nFpuYFBxjtGbXgoMbyFGFHemkC5ayz6D ►💎Donate Bitcoin Cash: AbU983Rg4mfRpZ45BmcnitgZfvnDDkzdk ►💎Donate Using Paypal: https://goo.gl/7m1X4Z 📔___RECOMMENDED READING ►Ethereum: Blockchains, Digital Assets, Smart Contracts, DAOs- http://amzn.to/2t015ik ►The Singularity Is Near: When Humans Transcend Biology- http://amzn.to/2rHXGjQ ►Physics of the Future: How Science Will Shape Human Destiny and Our Daily Lives by the Year 2100: http://amzn.to/2tUaEfa ►The Creature From Jekyll Island: http://amzn.to/2sWZLfa ►Think and Grow Rich - Napoleon Hill: http://amzn.to/2t1nHOT ►📺Introduction to Cryptocurrency Playlist: https://goo.gl/YZTwvc 👕👚Grab Some Ethereum Shirts: ►Deep Space Diamond Tee Shirt http://amzn.to/2tUfwkn ►Prism Rainbow Light T Shirt http://amzn.to/2t19DoD 🔑__A MUST HAVE__ ►Ledger Nano S (Bitcoin+Ethereum+More Hardware Wallet): https://goo.gl/wZUVES ►Hardware Wallet Superstore (5$ Off): https://goo.gl/ftZL3w 💻FOLLOW US HERE: ►Instagram: https://goo.gl/tV9kZh ►Twitter: https://goo.gl/fY2W2k ►Snapchat: minamarie0012 ►Crypt0's News Official Site: https://goo.gl/mnWvPL -~-~~-~~~-~~-~- Please watch: "Cryptocurrency- An Introduction: Featuring Elle & Crypt0! (Basics, Tips, Resources, & Much More!)" https://www.youtube.com/watch?v=h9B52U6tsvo -~-~~-~~~-~~-~-
Views: 1662 Crypt0
How To Create An Ethereum Smart Contract
 
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How To Create An Ethereum Smart Contract https://blockgeeks.com The most interesting part of Ethereum are smart contracts. You can think of smart contracts like autonomous agents deployed onto the Ethereum blockchain. Smart contracts are made up of some data, as well as some code that manipulates that data. Just like a user account, smart contract accounts also have their own balance as well as a public address, which looks the same as the user account address. To interact with smart contracts, you send transactions to it with some extra data, to specify which function you want to invoke, as well as any input parameters for the function. The transaction will invoke the function, and return any possible output once it has been mined. We're going to be using Remix to write smart contracts, which is an online IDE, available for free at remix.ethereum.org. It comes with a compiler, editor and debugger for solidity. The great part is that you don't need to download or install or set up anything, you just go to this webpage and start writing smart contracts, which is awesome. The UI is divided into four main sections. The left part is our file explorer where we can open Solidity files from our hard drive. The middle section is our editor where we can view and write our source code. At the bottom we have a terminal which prints out important events and transactions, and the rightmost section contains some handy tools for compiling running and debugging our code. The first example we'll look at is a smart contract called Hodor. Let's load up the source code. You'll notice that Solidity source files end with the .sol extension. The syntax of Solidity resembles java script, so it should be fairly easy to pick up. The first we see at the top uses the pragma directive. This tells the compiler that the contract is written for a Solidity compiler version of at least [0.4.0 00:01:53], or anything newer that doesn't break functionality. We then have a multi-line comment block, briefly describing what this class does. The next line is where we declare the name of our smart contract using the contract keyword. We've simply called out class Hodor because, as you'll see, all it does is return a simple greeting. We also declared two state variables called Creator and Greeting. Creator has an address data type, which is used for storing addresses of accounts. Greeting is a string data type, which just stores some text greeting. We initialized both of these variables in our constructor. The constructor is declared using the function keyword, followed by the name of the class. The constructor is a special function that is invoked only once, when a contract is first deployed to the Ethereum blockchain. You can only declare a single constructor for a contract. We also inject the initial string greeting as a parameter, into the constructor, and set the greeting variable to that value. In the second line of the constructor, we initialize the creator variable to a value called message.sender, but if you look closely, you might wonder where this value came from, since it's not being injected into the constructor. This is because message is a global variable that provides certain information about the message, such as the address of the account sending it. We can get the address of the account creating the contract, using message.sender in the constructor. You may notice that we don't actually use this creator variable anywhere in our contract, because this is just a simple example. We could potentially use this information to implement access control to certain functions. We'll see an example of this later. Read more on Blockgeeks: https://blockgeeks.com
Views: 44441 Blockgeeks
Securify: Not Your Grandma’s Smart Contract Verification
 
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We present Securify (www.securify.ch), the first push-button security auditing tool for Ethereum smart contracts that is fully automated, easily extensible to new security vulnerabilities, and provides strong security guarantees. The core technical idea behind Securify is to soundly extract deep semantic information from the smart contract using automated abstract reasoning. This information is then used to ensure the absence of critical security vulnerabilities, such as reentrant calls, unprivileged storage accesses, and many others. Securify precisely analyzes real-world smart contracts within seconds, and handles any language that compiles to Ethereum bytecode. Quentin Hibon is a member of the blockchain security team at the Software Reliability Lab, ETH Zurich. He works on Securify, the first push-button security auditing tool for Ethereum smart contracts, and develops new generation systems for automated analysis and testing of smart contracts. He holds a Master of Science in Engineering from Ecole Polytechnique (France).
Views: 411 Ethereum Foundation
ChainLink (LINK) - Decentralized Oracle for Smart Contracts
 
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How to Buy Bitcoin: https://youtu.be/CYItaOmGvrU Buy Cryptos on Binance: https://youtu.be/lD_bpFQTITc Buy Cryptos on KuCoin: https://youtu.be/DDCSA5Z0as8 Crypto Love T-shirts and Mugs: https://youtu.be/bdFVI67tu_Q Support Crypto Love on Patreon: https://youtu.be/9sy3xbPxP_w ChainLink (LINK) is connecting information and APIs to smart contracts through the LINK Network and could be posed for big gains. Here I'll review ChainLink more in depth and offer some insights into the future of this potential giant. To appease money-hungry lawyers and irresponsible people, it should be known that I AM NOT A FINANCIAL ADVISOR and THIS IS NOT INVESTMENT ADVICE. I am merely educating and entertaining. What you do with your own money is your own responsibility. Seek the counsel of an intelligent financial advisor (good luck finding one) before investing yours or anyone else’s money. Crypto Love Donation: Bitcoin - 15DazsKt5EKLPojjKacPAwnJ2nJn2EF9A1 Ethereum - 0x5Db0b1300898d349DDE9DDBEc284F8602F55AA06 Litecoin - LQEmDtB44jGfYhT3rV683wGwBuVPxX2fV8 NEO - AVPUTz3WmL1ASjVj9FJCYGUP3CDTkbeUoa
Views: 4176 Crypto Love
Ethereum Q&A: Impact of smart contracts on law and accounting
 
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Reading and writing the word of the law, but judging according to the spirit of the law - how does this apply to code for legal frameworks? We already have plenty of institutions that allow you flexibility to have your problem adjudicated in front of an impartial judge or a jury of your peers. Law students will leave believing in the spirit of the law and be gradually ground down in the system of prosecution and courts until eventually they don't believe in anything other than winning the case. We are now looking at building systems where the outcome is known based on the formula of a neutral contract. It will not always work, sometimes it will backfire badly and we will have another DAO-saster. How can law create a safety net? The worst case is that a smart contract fails and then parties in the contract geo-locate each other to sue them in whatever court they choose at the time. New York Convention on Arbitration, an international treaty that allows you to claim independent legal arbitration within a private system of law in 156 countries. Distinguishing between use and abuse of the system with normative judgement. In a system that has no spirit of law, only rule, there is no distinction between use and abuse; if the consensus algorithm allowed it, it is not abuse. The lesson of TheDAO wasn't "do we fork or not fork?", it was that you don't put $150 million in an untested contract, you idiots! That is a lesson that is self-correcting because people got hurt. The caveat of these new systems is that they are free-market, collaborative, voluntary participation: caveat emptor - "buyer beware." Is it true that "accounting jobs will be gone in five years because of smart contracts"? The jobs will not be gone, they will be radically transformed. If you don't embrace this new technology, or you fight it, you will find yourself in a smaller and smaller niche that is less important to the rest of the world. Smart contracts are neither "smart," nor "contracts." They are programs which are rather 'dumb.' Decentralisation is a powerful force and we are living the century of decentralisation. The first question is from a talk which took place on October 26th 2016 at the Blockchain Meetup in Zürich, Switzerland: https://www.meetup.com/Zurich-Blockchain-Meetup/events/233058629/ Watch the full talk here: https://youtu.be/3NqDNetEqmI The second question is from a keynote talk which took place on October 19th 2016 during the Bitcoin Wednesday Meetup at the Eye Film Museum in Amsterdam, Netherlands: https://www.meetup.com/BitcoinWednesday/events/234498117/ Watch the full talk here: https://youtu.be/P6F1vTG_hA0 Learn more about the intersection of cryptocurrencies and law: https://www.thirdkey.solutions/events/ RELATED: The Internet will eat your business - https://youtu.be/DXLZSgf4b8Q Why developers are leaving banks - https://youtu.be/GqOZ4IAQ-xQ Programmable Money: Hard Promises, Soft Contracts - https://youtu.be/prHax4yrncY Is Bitcoin a democracy? - https://youtu.be/TC3Hq76UT5g Hard Promises, Soft Promises: Promoting Autonomy instead of Authority - https://youtu.be/UJSdMFPjW8c Irreversibility and consumer protection - https://youtu.be/R107YWu5XzU Unstoppable code - https://youtu.be/AQx3E3F8Kz4 The Lion and the Shark: Divergent Evolution in Cryptocurrency - https://youtu.be/d0x6CtD8iq4 The Lightning Network - https://youtu.be/vPnO9ExJ50A Ethereum, ICOs, and Rocket Science - https://youtu.be/OWI5-AVndgk TheDAO - Why failure is a necessity for learning - https://youtu.be/2KZTx8IYc9s Advanced Bitcoin Scripting -- Part 1: Transactions & Multisig - https://youtu.be/8FeAXjkmDcQ Advanced Bitcoin Scripting -- Part 2: SegWit, Consensus, & Trustware - https://youtu.be/pQbeBduVQ4I 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.com/Orfan/) Outro Graphics: Phneep (http://www.phneep.com/) Outro Art: Rock Barcellos (http://www.rockincomics.com.br/)
Views: 13324 aantonop
Smart Contracts in Real Estate Transactions
 
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Denise Howell, Emory Roane, Matt Curtis and Eric Goldman talk about smart contracts and how using the blockchain in real estate transactions could change the way properties are bought in the future. For the full episode, visit https://twit.tv/twil/404 Subscribe: https://twit.tv/subscribe About us: TWiT.tv is a technology podcasting network located in the San Francisco Bay Area with the #1 ranked technology podcast This Week in Tech hosted by Leo Laporte. Every week we produce over 30 hours of content on a variety of programs including Tech News Today, The New Screen Savers, MacBreak Weekly, This Week in Google, Windows Weekly, Security Now, All About Android, and more. Follow us: https://twit.tv/ https://twitter.com/TWiT https://www.facebook.com/TWiTNetwork https://www.instagram.com/twit.tv/
Views: 1726 TWiT Netcast Network
Developing Ethereum Smart Contracts for Beginners (Trailer)
 
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Take the Course (Free): https://goo.gl/EiKpPP In this course, you will learn how to create smart contracts in Solidity, using the Remix IDE. You will also learn how to create a web user interface to interact with the smart contract, with the help of the official Ethereum Web3.js. http://coursetro.com http://facebook.com/coursetro - - - - - - - - - - - - - - - - - - - - - - Subscribe for NEW VIDEOS every Monday-Thursday @ 10:30 AM ET! My site: https://coursetro.com My personal FB account: http://fb.com/logodesigner Coursetro FB: http://fb.com/coursetro Coursetro's Twitter: http://twitter.com/designcoursecom Join my Discord! https://discord.gg/a27CKAF ^-Chat with me and others - - - - - - - - - - - - - - - - - - - - - - Who is Gary Simon? Well, I'm a full stack developer with 2+ decades experience and I teach people how to design and code. I've created around 100+ courses for big brands like LinkedIn, Lynda.com, Pluralsight and Envato Network. Now, I focus all of my time and energy on this channel and my website Coursetro.com. Come to my discord server or add me on social media and say Hi!
Views: 34153 DesignCourse
How Blockchain is Disrupting Insurance Companies with Smart Contracts
 
03:06
Michael Folkson, Founder of RiskBazaar, walks us through traditional insurance contracts and how their peer-to-peer market place is changing the future for risk contracts on the blockchain. Dive into the future and see where this technology will take us. https://riskbazaar.org/#/ RiskBazaar is part of Plug and Play's Insurtech accelerator program. Find out how you springshot your startup and apply today: http://plugandplaytechcenter.com/startup-application
Create Your First Ethereum Smart Contract In Solidity | Blockchain
 
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In this video I show you how easy it is to create your first Ethereum smart contract using the Solidity programming language. Remix - Solidity IDE - https://ethereum.github.io/browser-solidity Solidity Documentation - https://solidity.readthedocs.io/en/develop/ Check out my other videos and articles http://edzynda.com Follow me on Steemit https://steemit.com/@edzynda 💎►Donate Ether and Ethereum-Based (ERC-20) Tokens 0x146cfed833cc926b16b0da9257e8a281c2add9f3 💎►Donate Bitcoin 1KyZbSeeCWgmeRrUQTTbb3meJEyPCGy3zd 💎►Donate Dash XoZdSzN3hPFksQQZx616A6fGGN22zANpMW 💎►Donate Lisk 16883042352161362207L 💎►Donate IOTA SRZWULMJI9WJFVWDIVXXMVWHVVJAKMAXKMFOINQGEZXNJYLRSHPXBE9PHQDUVIRESEUZSYJBGGKLBMEYIJOKIOIXBU
Views: 18627 What The Func?
Smart Contracts - Part 1: Smart Contracts - Blockchain & IoT
 
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Legal lessons - Part one An introduction of Smart contracts - Blockchain & IoT Easy simple explanetory video that define and clarify how smart contracts work
Smart Contracts and Formal Verification with Z3 with Pact
 
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Stuart Popejoy C◦mp◦se :: Conference http://www.composeconference.org/2017/ May 19, 2017 We present Pact, a new open-source language for authoring smart contracts, built in Haskell. Smart contract languages like Ethereum’s Solidity have taken a maximalist approach to functionality, in no small part because the slow execution speed of public blockchains emphasizes “feature-rich” transactions that compose multiple invariants into a single transaction. Resulting logic is complex, brittle, and often incorrect. With Pact, a high-performance blockchain ensures that transactions can closely model business invariants, and “fail fast” on invalid cases or retry scenarios. Logic is constrained to Turing-incomplete (terminating) execution and single-assignment (immutable) variables. We discuss the unique hybrid of strict OLTP workload and limited key-value querying needed for blockchain applications, and how this informs Pact’s database model. We also discuss the influence of Bitcoin scripts on Pact’s design as well as its integration of public-key authorization schemes. We demonstrate various Pact smart contracts running both in a standalone interpreter as well as in the ScalableBFT blockchain. Finally, we give a demo of static analysis and verification using the Z3 theorem prover, and show the new development environment with a sample application.
Views: 968 Compose Conference
Smart Contracts and their Application in Supply Chain Management
 
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Thesis - Smart Contracts and their Application in Supply Chain Management - By Angwei Law
Views: 3894 Data Stream
Palestra – INTRODUÇÃO AO BLOCKCHAIN E SMART CONTRACTS PARA ADVOGADOS
 
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Palestra – INTRODUÇÃO AO BLOCKCHAIN E SMART CONTRACTS PARA ADVOGADOS
How To Quickly Code & Use Ethereum Smart Contracts
 
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The Proof Token Sale Launches is a few hours: https://www.proofsuite.com/token Use it at http://www.proofsuite.com/smartcontract. This website features an online solidity compiler, solidity editor, smart contract deployer. Many things have been ripped out from the development environment for convenience. For beginners and ethereum heads who want to do things fast. Still a work in progress
Views: 2275 Proof Suite
DEF CON 25 - Matt Suiche - Porosity  A Decompiler For Blockchain Based Smart Contracts Bytecode
 
36:22
Ethereum is gaining a significant popularity in the blockchain community, mainly due to fact that it is design in a way that enables developers to write decentralized applications (Dapps) and smart-contract using blockchain technology. Ethereum blockchain is a consensus-based globally executed virtual machine, also referred as Ethereum Virtual Machine (EVM) by implemented its own micro-kernel supporting a handful number of instructions, its own stack, memory and storage. This enables the radical new concept of distributed applications. Contracts live on the blockchain in an Ethereum-specific binary format (EVM bytecode). However, contracts are typically written in some high-level language such as Solidity and then compiled into byte code to be uploaded on the blockchain. Solidity is a contract-oriented, high-level language whose syntax is similar to that of JavaScript. This new paradigm of applications opens the door to many possibilities and opportunities. Blockchain is often referred as secure by design, but now that blockchains can embed applications this raise multiple questions regarding architecture, design, attack vectors and patch deployments. As we, reverse engineers, know having access to source code is often a luxury. Hence, the need for an open-source tool like Porosity: decompiler for EVM bytecode into readable Solidity-syntax contracts - to enable static and dynamic analysis of compiled contracts.
Views: 2832 DEFCONConference
Ethereum Smart Contracts In Solidity 1 -  State, Functions, Modifiers and Events | Blockchain
 
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In this tutorial, I show you the basics of Ethereum smart contracts and explain state variables, functions, modifiers and events. Remix - Solidity IDE - https://remix.ethereum.org Solidity Documentation - https://solidity.readthedocs.io/en/develop/ Check out my other videos and articles http://edzynda.com Follow me on Steemit https://steemit.com/@edzynda 💎►Donate Ether and Ethereum-Based (ERC-20) Tokens 0x146cfed833cc926b16b0da9257e8a281c2add9f3 💎►Donate Bitcoin 1KyZbSeeCWgmeRrUQTTbb3meJEyPCGy3zd 💎►Donate Dash XoZdSzN3hPFksQQZx616A6fGGN22zANpMW 💎►Donate Lisk 16883042352161362207L 💎►Donate IOTA SRZWULMJI9WJFVWDIVXXMVWHVVJAKMAXKMFOINQGEZXNJYLRSHPXBE9PHQDUVIRESEUZSYJBGGKLBMEYIJOKIOIXBU
Views: 8271 What The Func?
Avoid the Middle-Man (Smart Contracts) - Computerphile
 
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Could Smart Contracts be the end for Uber, Amazon and eBay? Blockchain technology as an escrow service, Christopher Ellis explains. 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: 75143 Computerphile
Challenges Ahead for Smart Contracts
 
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Ethereum has unleashed the power of smart contracts by creating a massively distributed, resilient, and replicated computing platform. In this talk, I will discuss the three challenges I see ahead for Ethereum, go over known techniques for addressing them, and will identify the future work that needs to be done because of the unique challenges faced by the Ethereum platform. First, we’ll talk about scale, touch upon known techniques for scaling on- and off-chain. Next, we’ll talk about program verification, what it can do, and why it is not the panacea that many people make out to be. In particular, I’ll talk about the kinds of smart contract properties that we know how to ascertain, versus the kinds of smart contract properties that we would ideally like to verify, and discuss the gap between the two. Finally, I’ll talk about the next frontier involving private data and private computation on a public blockchain, a combination thought to be impossible by some, and describe how we can achieve it with the help of secure hardware. Emin Gün Sirer Associate Professor, Cornell University, and Co-Director at the Initiative for Cryptocurrencies and Smart Contracts
Views: 894 Ethereum Foundation
Smart Contracts and Truffle 101. Part 2 - The basics.
 
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Working with truffle - the basics. Write smart contract in truffle Deploy smart contract in truffle Test smart contract in truffle https://c9.io https://truffleframework.com https://nodejs.org https://github.com/ethereumjs/testrpc This video was created with the help of the Blockchain academy. During October 2017 we'll collaborate to establish a weekend workshop on smart contracts in NYC. For more details: https://www.theblockchainacademy.com/store/FBFKTG2t
Views: 3639 Shlomi Zeltsinger
Come funzionano smart contract ethereum - semplice con esempi
 
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Diamo una rapida occhiata agli smart contract Entra nel mio gruppo discord https://discord.gg/qrfNf62 ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● 🔒Non rischiare di venir hackerato, dotati di Ledger nano s: https://www.ledgerwallet.com/r/3678?path=/products/ledger-nano-s&tracker=MY_TRACKER 💰bonus 8 € Acquista facilmente bitcoin su Coinbase : https://www.coinbase.com/join/5a19affb0f718102dad8f5d1 👑Exchange consigliato- Binance: https://www.binance.com/?ref=15276999 💰sconto del 3% su Genesis MINING : 6X2Pqj ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● 💪 Donazioni (Se qualcuno volesse fare il pazzo) BTC Adress 3Gs2HtX3sC4LZKvyKRLCPv8Uut3t2abkk9 Litecoin Adress MSCzgzah5MqQhTopm3bYaRc9Nue8QbbhbK ETH Adress 0x4f6274D0b6dc1c693137CB6c4B858b21e2dDA95B Bch adress 13WdEKB8yP91HN8XvxhaxaF9netaftVG3q Ripple adress raKUZu6DvDujPkKxP6UCFKLkqap9FULziV Dash Adress XscQmWz4qZGJgGzFickfj59bMthDngD2Lh Zcash Adress t1g3RQw6ArHoiGqVQyr2tNa5AM2WjdCJPhb ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● ⚡ Consulenze private -- [email protected] ⚡ Vuoi pubblicizzare la tua ICO? contattami su [email protected] ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● 📚Libri consigliati: bitcoin mastering: http://amzn.to/2ByyQvU The age of Cryptocurrency: http://amzn.to/2BzM9wd Blockchain revolution: http://amzn.to/2DvuN0A ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● 📹Mia attrezzatura video: - cam nikon d3300 http://amzn.to/2DclUZO - 2° obiettivo Nikkor 55-200 http://amzn.to/2kOMYpx - Microfono rode Lavalier http://amzn.to/2DcsaR3 - adattatore lavalier http://amzn.to/2B6IxgL - Mic Rode PRO http://amzn.to/2BlI0Mb ●▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬● ♨️Social: -Facebook: https://www.facebook.com/AngeloniFilippo -Linkedin: https://www.linkedin.com/in/filippoangeloni/ -Sito web personale www.filippoangeloni.com #bitcoin #criptovalute #filippoangeloni #smartcontract
Views: 7757 Filippo Angeloni
Was sind Smart Contracts? Blockchain Grundlagen #6 | Vlogchain - Video. Blockchain. News.
 
06:35
Blockchain Grundlagen #6: Smart Contracts. Was sind Smart Contracts und warum sind Sie so besonders? Wenn euch das Video gefallen hat, lasst gerne einen 👍 da Auch freue ich mich sehr über Kommentare, Anregungen und Ideen zu Themen ------------------------ 🌐 Vlogchain auf Social Media Twitter: https://goo.gl/wozymw Steemit: https://goo.gl/WMmVkz Homepage: http://vlogchain.de/ 💸 Ihr könnt mich mit Spenden unterstützen Bitcoin: 1AYn9igqr5pfqce4Qde7phJfUdwV8qe9VY Ether: 0x4c20b7561f2E706232d16cb5a231a9d73c18f905 Litecoin: LgpR1SznHZGyZyHqQoFzudnSZK3VvniWMH Dash: Xt7emqXcDxVhFS2ry2VqRjUYdsJqSGUqFZ 📃 Meine Amazon-Wunschliste für noch bessere Videos https://goo.gl/k8o1cM ▶ Meine anderen Youtube-Kanäle: https://www.youtube.com/c/TrailerfyDeutschland https://www.youtube.com/user/ytrelations https://www.youtube.com/user/somethingwithscience ------------------------ 📖 Buchempfehlungen Bitcoin, Blockchain und Kryptoassets: Eine umfassende Einführung http://amzn.to/2vqIvwX Ethereum: Blockchains, Digital Assets, Smart Contracts, DAOs http://amzn.to/2ttObEV Future Crimes http://amzn.to/2tfC2bL ------------------------ Mein Equipment 📹 Meine Vlog-Kamera (Webcam) http://amzn.to/2ttQE2j 🎥 Meine Hauptkamera http://amzn.to/2tudfMa 🎤 Mein Mikrofon http://amzn.to/2vqZfnU 🎚 Mein Audiointerface http://amzn.to/2tg522M 🎧 Meine Kopfhörer http://amzn.to/2unjYfy 💡 Mein Kameralicht http://amzn.to/2ttWsZv 🖊 Mein Zeichentablett http://amzn.to/2uxbJxP 👕👚 T-Shirts gibt es hier: http://amzn.to/2tXGOJi http://amzn.to/2tg0Gsw ------------------------ Mehr Crypto: 🔑 Hardware Wallet Ledger Nano S (Bitcoin+Ethereum Hardware Wallet) http://amzn.to/2tu6dah 💎 Bitcoin & Ether Mining (Genesis Mining) https://goo.gl/GihPm2 Mit diesem Rabatt-Code bekommt Ihr 3% Discount: n9fW6t
Views: 675 Vlogchain
Webinar sobre las principales cuestiones legales de los Smart Contracts
 
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Iniciamos una serie de conferencias online – webinars, en las que durante 30 minutos los expertos de la firma analizan aspectos de máxima actualidad jurídica de una forma ágil y participativa. Nuestros especialistas analizaron cuáles son las principales cuestiones legales sobre lo Smart Contract, un programa que informático que facilita, asegura, hace cumplir y ejecuta acuerdos
Views: 1039 Cuatrecasas
Solidity Tutorial Part 9 - Smart contracts on Ethereum
 
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Video Tutorial series for beginners about the language solidity, for creating smart contracts on ethereum blockchain, ICOs and Decentralized Autonomous Organizations. On this video we will seesaw to create a real life application smart contract. Github Repository: https://github.com/magonicolas/Ethereum-Solidity @magonicolas Ether - Donaciones / Donations 0x23a46389f350cac832e8faed0334bc1aaf0c4a79 Bitcoin - Donaciones / Donations 17tVDECS6Q4d5zpqcLmpKostNfAJkhYFvt
Views: 673 Nicolas Palacios
04. Capturing Smart Contract Events in our User Interface (Solidity)
 
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Free Course Page (In development): https://goo.gl/EiKpPP Written tutorial of this video: https://goo.gl/tJFWw1 https://coursetro.com This video is the 4th lesson from my 100% free course: "Developing Ethereum Smart Contracts for Beginners" Check it out here: https://goo.gl/EiKpPP In this video, we're going to learn how Solidity Events work in smart contracts by creating our own event, and using that event in our Web UI to show an animated loading graphic while the transaction confirms on the testrpc client. https://coursetro.com https://www.facebook.com/coursetro/ - - - - - - - - - - - - - - - - - - - - - - Subscribe for NEW VIDEOS every Monday-Thursday @ 10:30 AM ET! My site: https://coursetro.com My personal FB account: http://fb.com/logodesigner Coursetro FB: http://fb.com/coursetro Coursetro's Twitter: http://twitter.com/designcoursecom Join my Discord! https://discord.gg/a27CKAF ^-Chat with me and others - - - - - - - - - - - - - - - - - - - - - - Who is Gary Simon? Well, I'm a full stack developer with 2+ decades experience and I teach people how to design and code. I've created around 100+ courses for big brands like LinkedIn, Lynda.com, Pluralsight and Envato Network. Now, I focus all of my time and energy on this channel and my website Coursetro.com. Come to my discord server or add me on social media and say Hi!
Views: 19266 DesignCourse
Blockchain smart contracts explained - Bitbond #TOA17
 
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https://www.bitbond.com Blockchain smart contracts tutorial Blockchain Smart Contracts explained - presented by Bitbond CEO Radoslav Albrecht at this years Tech Open Air Festival in Berlin. This event was hosted by The Place. Table of content: A Primer on Blockchain Technology @ 1:55 An introduction to Smart Contracts @ 12:50 Use cases of Smart Contracts @ 26:43 Q&A @ 43:54 A Primer on Blockchain Technology @ 1:55 The concept of Blockchain was first discussed in Satoshi Nakomoto’s whitepaper called, Bitcoin: A Peer to Peer Electronic Cash System. In this whitepaper Nakomoto discusses the need for a cryptographically secured form of digital cash. Up until then, all forms of digital money had faltered due to the ‘double spend’ problem. This described how all digital assets could be infinitely copied and are therefore rendered worthless. By creating the Blockchain, Nakomoto solved this problem. Blockchain in its simplest form, is a record of transactions sorted into blocks. These transactions are time-stamped within the blocks which are each immutably linked to the preceding block. By creating this link, the blocks are made tamper-proof, as changing one transaction in one of the blocks would require all preceding blocks to be changed as well. The Blockchain therefore leverages the power of the internet to facilitate the exchange of value across borders. Companies like Bitbond use this to facilitate both international fixed income investments (https://www.bitbond.com/fixed-income-investments), and small business loans (https://www.bitbond.com/small-business-loans). What are Smart Contracts? 12:50 Smart Contracts are “If this, then that” statements written into the blockchain. They allow for the exchange of money, properties, shares and anything else of value, without the use of an intermediary. Perhaps the easiest way to understand the function of a Smart Contract, is to compare it to the way a vending machine works. If you choose an item from the vending machine for example and input money, then the item falls into the grate and becomes available to you. It does not become available to you until you input the money, which in this case, is the event that triggers the action (the item falling into the grate). Similarly, a Smart Contract is an immutable agreement between two parties to trigger a certain action at a predefined event. If for example, you paid into a disaster relief fund designed to help those affected by earthquakes, you could create a Smart Contract which pays out the money when a certain predefined level of tectonic movement is measured which is indicative of an earthquake. This has several important advantages, chief among them being the removal of intermediaries and the automation of processes which otherwise may be expensive or open to fraud. As a result, individuals can take further control of their assets through the Blockchain. How do Smart Contracts work? Smart Contracts currently work primarily on the Ethereum Blockchain. In fact, founder Vitalik Buterin, wrote the Ethereum Blockchain in a programming language called Solidity which is explicitly designed for Smart Contracts. In this video, we provide the outlines of a Smart Contract tutorial to help you get started with the technology. Specifically, Smart Contracts work in three steps: 1. Two parties agree on terms 2. A predefined event occurs 3. The event triggers and action (payout) With these three steps in mind, it becomes that smart contracts not only define the rules of an agreement in the same way that a traditional contract does, but also automatically enforces those obligations through the execution of code. How can I use a Smart Contract? 21:10 In this presentation, Radoslav Albrecht provides a detailed explanation of not only what a Smart Contract is, but also how a layperson may set one up on his own. Specifically, he mentions three browser plugins: 1. Parity 2. Metamask 3. Mist These three plugins are probably the easiest way for people, who may not be developers, to interact with, and learn about Smart Contracts on the Blockchain. To set up your own Smart Contract, you can visit dealmate.io. This website is a relatively light-weight solution which will let you set up your first basic Smart Contract for free and without the need for code. Simply enter your desired parameters and have dealmate generate the code for you. You will need the Metamask plugin to use dealmate. Developers can also create Smart Contracts on the Ethereum Blockchain directly by learning a programming language called Solidity. ----------------------- Relevant links: https://www.bitbond.com https://toa.berlin/ http://theplaceberlin.com/ https://parity.io/ https://metamask.io/ https://github.com/ethereum/mist https://en.wikipedia.org/wiki/Solidity https://ethereumbuilders.gitbooks.io/guide/content/en/solidity_tutorials.html http://dealmate.io/
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Ethereum`s smart contracts platform has gathered lots of attention from a vast range of industries since it could potentially be utilized to digitize and streamline inefficient business processes later on. The majority of the altcoin technologies continue to be significantly underdeveloped. As it is a JavaScript run-time environment, it`ll be familiar to the majority of programmers and therefore will permit you access to an immense pool of talented software developers. Better management indeed should work as a catalyst for those investors. It`s supplied for informational services only. Hence, it might be used for IoT networks, that`s the project`s aim.
The token will be essential to execute many kinds of transactions within the network, like the majority of the token schemes that will do the job. The token will be called ICX and it is going to be one of many that may be transacted in the computer system. The IOTA token is the sole major digital currency that doesn`t use a complete blockchain to conduct transactions.
Each blockchain is made for a particular intent. In general, blockchain powered systems appear to supply benefits to everyone. The really exciting portion of blockchain is the fact that it operates on a decentralized network as opposed to via the traditional client-server model.
The portfolio management tool is user friendly and powerful, giving users an easy and effective approach to make and manage portfolios. It lets users produce and manage portfolios in an easy and efficient way. You should think about whether the info is appropriate to your demands, and where appropriate, seek expert help from a financial adviser. The info is general in nature and doesn`t take into consideration your own personal situation. Let`s take a good look at the site`s features. 12 months past, a number of these review sites didn`t exist. For a bit more on how to make a great looking website you`re able to read this report.
In the event the project gets successful, there`ll be greater demand for those tokens which with reduced supply, will raise the costs of the tokens. The NXT project is among the longest standing blockchain projects in the market these days. Funding without venture capital, investment banks or even crowdfunding platforms like IndieGoGo or Kickstarter also provides an enormous chance to the investors, who might support their favourite merchandise and services with no third-party intervention. There`s no investment that`s 100% guaranteed. Within this way you can steadily develop your everyday income. Not only does this help people send and get money without needing to pay excessive fees, but in addition it empowers people by allowing them more anonymity when it has to do with their financial affairs. For instance, a growing number of leading banks enjoy using Ripple in their everyday operations.
The incorrect type of team can wind up with an ineffective working relationship. We think they will be able to carry it off, and that more talent is going to be attracted to the technically huge ambitions of the undertaking. Ability to find the long-term view and ignore daily fluctuations is challenging to master and simple to overlook. It is vital to recognize credible opportunities, because not each one of them will succeed. Invest just what you can afford to lose. Only some of these actually take a token to bootstrap and track the worth of the network. Nearly all sites utilize the ERC-20 standard to satisfy this endeavor.

The acryptoa portion of the word denotes the cryptography used to ensure the blockchain, and the acurrencya portion of the word denotes the ability to exchange the tokens for goods and solutions. The absolute pacifism part is assumed I think, in spite of someone having the capability to locate some examples where it may appear otherwise. What you share is is an instance of absolute terror onto people who ought to be fought if it may be. The numbers won`t be good. Today they are much higher.
You`ll reap the benefits for the very long haul if you stick with your advertising and marketing guns. There are certain sorts of offerings that have special exemptions from the full blown registration practice. The range is hard to specify, taking into consideration the diversity in choices. According to the provision, the scope of the very first transaction in NEPSE is within three times the provider`s book value.
When the project is completed, the tokens value is probably going to increase because there is currently a tangible item, instead of simply an idea. After all, research demonstrates that clients use their networks to choose consultants more than every other method, and they, without doubt, know somebody who knows you. Getting knowledge in the region of property investment is insufficient. You may observe I didn`t speak about a few skills. After all, in case you have a saleable skill, it`s a simple business to enter.
A collection company cannot collect any sum of money that isn`t permitted by law or by agreement. Furthermore, it would be required to show the terms of that agreement in court. It is not surprising that consulting is attractive to numerous individuals who wish to launch a company. You also have to know the way the corporation will account for the exchanging of tokens. Starting a public company is a complicated and costly undertaking. Doing so makes a contract that might be binding. If you haven`t signed a contract with the collection business, you owe them nothing.
Inside my view there is just one house, and all of us live in it. Property should not be damaged. In addition, should the property is well-connected to the public transport, then it aids in giving a good advantage, particularly for the middle-class family.
As previously mentioned, the majority of the above coins are offered for purchase direct from the Royal Mint. Offerings where the total raised is less than one million dollars come beneath a special procedure that is far less complicated. Once more, money well spent. Another method is to commit your own money. It s pretty obvious to anybody who reads the accounts. You DON`T need to make a new account.
Enterprises and entire countries are now able to block Tor traffic without any issues. Nobody is suggesting that it isn`t the work of liberal Whites to oppose what`s wrong. To the contrary, the investments with the period of time of over five years are called as long-term investments. Original investors can then opt to sell their tokens to earn a significant profit.