Home
Search results “Web3 api ethereum”
Web3.JS: Ethereum JavaScript API
 
18:20
Web3.js is the official Ethereum Javascript API. You use it to interact with your Ethereum smart contracts. Watch this talk about the new developments in Web3.js EVENT: devcon three 2017 SPEAKER: Fabian Vogelsteller PERMISSIONS: The original video was published with the Creative Commons Attribution license (reuse allowed). CREDITS: Original video source: https://www.youtube.com/watch?v=92pdrRH_VGA
Views: 8465 Coding Tech
web3.js library, the Ethereum JavaScript API
 
17:21
This video explains what the purpose is of the web3.js library and how to use it. The web3.js library is also known as the Ethereum JavaScript API. To communicate with an Ethereum node or transact with a smart contract deployed on the blockchain from inside a JavaScript or web application you can use the web3.js library. Under the hood the web3.js library communicates with an Ethereum node through JSON RPC calls. The Ethereum node must expose its a RPC layer. The MetaMask extension exposes the web3 API by an injected web3 object which you can access via JavaScript. The MetaMask extension does not support most synchronous web3 API methods. Make your method calls asynchronous! To use the web3.js library in your web application: - Download the web3.js library from: https://github.com/ethereum/web3.js - In the dist folder you will find the files web3-light.min.js and web3.min.js - The file web3.min.js contains the Bignumber module and the file web3-light.min.js does not. If you do not know which one to choose, then use file web3.min.js. Web3.js API code examples can be found at: http://www.mobilefish.com/download/ethereum/web3api.html In the examples asynchronous methods were used if they are available. The demonstration Ethereum Dapp is made for educational purpose. The web interface can be found at: http://www.mobilefish.com/download/ethereum/DemoDapp.html The associated Solidity contract can be found at: http://www.mobilefish.com/download/ethereum/DemoContract.sol.txt The main purpose of this Dapp is to learn how to use web3.js api (v0.x.x) and how interact with a deployed smart contract. To setup the demonstration Ethereum Dapp (DemoApp.html): - Download and deploy the DemoContract.sol smart contract on any test network (testrpc, ropsten, rinkeby, or your own private ethereum node, etc). Save the contract address you will need it later. - Download and install the DemoApp.html on your web server. - Download and install the web3.min.js (v0.19.0) on your web server. - Modify the path to web3.min.js in the DemoApp.html file. - Modify the contract address in the DemoApp.html file. How to use the demonstration Ethereum Dapp (DemoApp.html): - Use a test network. - Have a test account with enough ethers to experiment with. - The demonstration Dapp (DemoApp.html) also works well with MetaMask. Notes: Two versions of DemoApp.html has been created. - A version using callbacks which is not very readable because of using callback trees! For educational purpose you can find this version at (but do not use it!): http://www.mobilefish.com/download/ethereum/DemoDappv0.1.html - The original code has been refactored by using JavaScript Promises. http://www.mobilefish.com/download/ethereum/DemoDapp.html - The DemoApp.html uses only vanilla JavaScript an uses the web3.js library. All code meaning: JavaScript, HTML and CSS can be found in this single web page. Warnings: - The DemoApp.html does not work with the web3.js v1.0.0. - The web3.js library v1.0.0 has many changes. The DemoApp.html will soon be obsolete. - Use the Demonstration Ethereum Dapp on a test environment. Check out all my other Ethereum related tutorial videos: https://goo.gl/eNJVXe Subscribe to my YouTube channel: https://goo.gl/61NFzK The presentation used in this video tutorial can be found at: http://www.mobilefish.com/developer/blockchain/blockchain_quickguide_ethereum_related_tutorials.html The DemoContract.sol used in the video: http://www.mobilefish.com/download/ethereum/DemoContract.sol.txt To interact with the DemoContract.sol use the demonstration Ethereum Dapp (using Javascript Promises): http://www.mobilefish.com/download/ethereum/DemoDapp.html An older version of the demonstration Ethereum Dapp (do not use this): http://www.mobilefish.com/download/ethereum/DemoDappv0.1.html More information about RPC layer can be found at: https://youtu.be/oOfDzXBXoOg The web3.js library can be found at: https://github.com/ethereum/web3.js The web3.js API v0.x.x can be found at: https://github.com/ethereum/wiki/wiki/JavaScript-API The web3.js API v1.0 can be found at: http://web3js.readthedocs.io/en/1.0/ MetaMask web3 API can be found at: https://github.com/MetaMask/faq/blob/master/DEVELOPERS.md #mobilefish #howto #ethereum
Views: 13587 Mobilefish.com
03. Web3.js Tutorial - Attach a GUI to your Ethereum Smart Contract
 
17:10
Free Course Page (In development): https://goo.gl/EiKpPP Written tutorial of this video: https://goo.gl/RdXuz9 https://coursetro.com This video is the 3rd 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 take our smart contract we created in the previous lesson, and make it accessible via a web page with the help of the official Ethereum Web3.js client and Ethereum-testrpc. https://coursetro.com https://www.facebook.com/coursetro/ - - - - - - - - - - - - - - - - - - - - - - Subscribe for NEW VIDEOS weekly! My Patreon: https://www.patreon.com/designcourse 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: 54096 DesignCourse
Web3.js Intro · Web3.js · #1 Ethereum Blockchain Developer Crash Course
 
22:04
► SUBSCRIBE TO THIS CHANNEL ◄ For more videos on how to build decentralized applications on The Ethereum Blockchain: https://www.youtube.com/channel/UCY0xL8V6NzzFcwzHCgB8orQ?sub_confirmation=1 DOWNLOAD FREE VIDEO COURSES: http://www.dappuniversity.com/free-download How to Build Ethereum Dapp (Decentralized Application Development Tutorial) https://youtu.be/3681ZYbDSSk Donate Ether to the channel: 0x39C7BC5496f4eaaa1fF75d88E079C22f0519E7b9 Website: http://dappuniversity.com/ Follow me on Twitter (@DappUniversity): https://twitter.com/DappUniversity Email me: [email protected]
Views: 6238 Dapp University
Ethereum dApp tutorial - Front end. Part 1
 
18:48
Please read! In this video I introduce the tools that are needed to build a user interface that will allow interaction with the Ethereum blockchain. Web3.js github: https://github.com/ethereum/wiki/blob/master/JavaScript-API.md Meteor: https://www.meteor.com/ Meteor web3: https://atmospherejs.com/ethereum/web3 Metamask: https://metamask.io/ Meteor for begginers. Great tutorials: https://www.youtube.com/playlist?list=PLLnpHn493BHECNl9I8gwos-hEfFrer7TV Creating smart contracts using Solidity: https://www.youtube.com/playlist?list=PLH4m2oS2ratdoHFEkGvwvd7TkeTv4sa7Z If you loved this video, show me the love! BTC - 1LxhkGzGu6q2LSfAGuH2DNBChmLhHkuQzP ETH - 0x9f24bde4cD92560D04A159C30f46E7820e31d95c http://zeltsinger.com/
Views: 48581 Shlomi Zeltsinger
Frontend Web Applications On Ethereum 1 - TestRPC and Web3.js | Blockchain
 
24:43
Ethereum allows you to create powerful smart contracts on the blockchain. The true power of Ethereum though, is the ability to create complex, decentralized applications or DApps. A great DApp ties smart contracts with an intunitive user-interface that allows the average user to leverage the power of the Ethereum network. In this video we begin to explore how to implement a web frontend that talks to our smart contracts deployed on the blockchain. Remix - Solidity IDE - https://remix.ethereum.org Solidity Documentation - https://solidity.readthedocs.io/en/develop/ ERC20 Standard - https://github.com/ethereum/eips/issues/20 EthereumJS TestRPC - https://github.com/ethereumjs/testrpc Web3JS - http://web3js.readthedocs.io/en/1.0/ 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: 20772 What The Func?
Using web3.js to interact with a deployed Ethereum smart contract
 
08:35
Brian walks you through writing your first lines of web3 JavaScript code in order to interact with the Ethereum smart contract we deployed to the blockchain in the previous video. web3 JS documentation: https://github.com/ethereum/web3.js/ For professional inquiries, contact http://web3devs.com/
Ethereum SignatureStorage Dapp proof of concept using web3.js
 
22:09
This video demonstrates the Ethereum SignatureStorage Dapp. This Dapp is a proof of concept how to store signatures in a smart contract. Disclaimer ------------------ The SignatureStorage Dapp is a proof of concept and should only be used for demonstration purpose. The SignatureStorage Dapp is not production ready. I have no legal experience. If you want to use this proof of concept (poc) you should contact a legal adviser in your country and verify if this poc is a legally sound solution. The SignatureStorage Dapp --------------------------------------------- The Ethereum SignatureStorage Dapp uses the web3.js v0.19.0 library. This proof of concept was created based on a discussion I had with a Dutch company which has a problem regarding to contracts and the signatures needed in order to close the deal. Problem description --------------------------------- Lets assume the ACME company wants to create a movie and hires two actors: Wily Coyote and Elmer Fudd. The ACME company (from now on referred to as “owner”) creates a paper contract and Wily and Elmer(from now on referred to as “signees”) both need to sign the contract in order to close the deal. For each signee, the owner creates a copy of the contract and the owner signs all 3 copies. The owner sends these 3 copies to Wily using the postal service. Wily signs these 3 copies and sends them back to the owner. The owner now sends the 3 copies to Elmer. Elmer signs these 3 copies, he keeps one copy and returns the other 2 to the owner. Finally the owner sends a copy to Wiley. The owner and signees now each have a copy of the contract with all the signatures. In case of a legal dispute each party can use their contract as evidence. Using paper contracts and actual signatures has pros and cons: Pros: - Easy to setup and use. Cons: - Using the postal service takes time compared with sending an email. - Using the postal service costs money think of: mail shipping rates and insurance. - The signees must send contracts back (extra burden for them). Of course the owner can use other solutions such as using SMS as signature or using signature images. But the owner always pays for these third party services. SignatureStorage Dapp ------------------------------------- The SignatureStorage Dapp is an alternative solution to paper contracts. The SignatureStorage Dapp uses the Ethereum blockchain. In this video I will demonstrate how to use the SignatureStorage Dapp and what the costs are. The SignatureStorage Dapp consists of two parts: - A web interface: https://www.mobilefish.com/download/ethereum/SignatureStorage.html - A solidity smart contract: https://www.mobilefish.com/download/ethereum/SignatureStorage.sol.txt Install SignatureStorage Dapp ------------------------------------------------ To install the SignatureStorage Dapp: - First deploy the smart contract. How to deploy a smart contract watch my video “Compile and deploy solidity code”: https://youtu.be/nnVX6fQUu4o - Next change the contract address in the SignatureStorage.html file. For more information watch my video“Ethereum contract Application Binary Interface”: https://youtu.be/F_l4HycnHAI - Download and install the two javascript libraries used by the SignatureStorage.html: The web3.min.js v0.19.0 https://github.com/ethereum/web3.js/tree/0.19.0/dist The sha256.js v3.1.2 https://code.google.com/archive/p/crypto-js/downloadsCryptoJS v3.1.2.zip Use the file: CryptoJS v3.1.2/rollups/sha256.js More information: https://code.google.com/archive/p/crypto-js - Install the SignatureStorage.html on a web server. How to use the SignatureStorage Dapp --------------------------------------------------------------- The SignatureStorage.sol is already deployed on the Rinkeby network. The contract address is: 0x2abdbeab89620b1d0837a9089a1b20447457fad2 Install the Chrome browser and install the MetaMask extension. For more information, watch my video: "MetaMask: How to restore your accounts”: https://youtu.be/cqz8-hOz_nk Open the SignatureStorage.html and click the help link. It will explain how to use the Dapp. Overview maximum transaction fees ----------------------------------------------------------- The Signature Storage Dapp is a proof of concept. I have made no effort to optimise the code to limit the number of operations and thus limit the gas usage. For users it is difficult to calculate the actual transaction fees. More information about transation fees watch my video “Ethereum gas, gas limit, gas price”: https://youtu.be/yFb2nuUUDX0 Check out all my other Ethereum related tutorial videos: https://goo.gl/eNJVXe Subscribe to my YouTube channel: https://goo.gl/61NFzK The presentation used in this video tutorial can be found at: https://www.mobilefish.com/developer/blockchain/blockchain_quickguide_ethereum_related_tutorials.html #mobilefish #howto #ethereum
Views: 932 Mobilefish.com
⛓️ Blockchain Developer Essentials PART 3: ETHEREUM Test RPC and Web3.js
 
15:31
⛓️ Blockchain Developer Essentials PART 3: Test RPC and Web3.js | Vlad Wulf Blockchain Developer 😀😀😀 This is the part you've been waiting for. Learn how to bind you blockchain with your backend using http protocol and send data from the blockchain to the frontend. We are using Test RPC and Web3 version 1.0 👫 Social Networks: Mail: [email protected] LinkedIn: https://www.linkedin.com/in/vladimir-a-16334213b/ Steemit: https://steemit.com/@vladwulf Facebook: https://www.facebook.com/VladWulfTutorials/ Twitter: https://twitter.com/VladWulf 😍 Donations: Paypal: [email protected] Ether: 0x854F6C6C00Fc6e197B4f5aC48D1bac4210fE
Views: 7527 Vlad Wulf
Exploring Ethereum with Web3 Tutorial: Part 1 - Checking Balances
 
12:58
Get FREE access to more content like this at http://www.techmaker.tv. Get a quick and easy understanding of how you can interact with Ethereum via Javascript. Helpful Links: Ethereum - http://ethereum.org/ Web3 - http://web3js.readthedocs.io/en/1.0/ Infura - http://infura.io/ Etherscan - http://www.etherscan.io
Views: 747 TechmakerTV
WEB3-Ajax-9.fetch API polyfill
 
06:57
전체수업과 소스코드는 아래 주소에 있습니다. https://opentutorials.org/module/3447
Views: 2134 생활코딩
Exploring Ethereum with Web3 Tutorial: Part 2 - Interacting with Smart Contracts
 
12:05
Get FREE access to more content like this at http://www.techmaker.tv. Get a quick and easy understanding of how you can interact with Ethereum via Javascript. In this episode, we dive into what a JSON ABI is, how to instantiate a new contract in Web3.js with your JSON ABI, and how to run functions on the smart contract with Javascript. Helpful Links: Ethereum - http://ethereum.org/ Web3 - http://web3js.readthedocs.io/en/1.0/ Infura - http://infura.io/ Etherscan - http://www.etherscan.io
Views: 356 TechmakerTV
Smart Contract Events · Web3.js · #6 Ethereum Blockchain Development Crash Course
 
19:39
► SUBSCRIBE TO THIS CHANNEL ◄ For more videos on how to build decentralized applications on The Ethereum Blockchain: https://www.youtube.com/channel/UCY0xL8V6NzzFcwzHCgB8orQ?sub_confirmation=1 DOWNLOAD FREE VIDEO COURSES: http://www.dappuniversity.com/free-download How to Build Ethereum Dapp (Decentralized Application Development Tutorial) http://www.dappuniversity.com/articles/the-ultimate-ethereum-dapp-tutorial Donate Ether to the channel: 0x39C7BC5496f4eaaa1fF75d88E079C22f0519E7b9 Website: http://dappuniversity.com/ Follow me on Twitter (@DappUniversity): https://twitter.com/DappUniversity Email me: [email protected]
Views: 962 Dapp University
3 Most Common Ways to create new Ethereum accounts - MEW Web3 Parity
 
23:01
General Inquires: https://t.me/lingqingmeng Video notes: https://gist.github.com/lingqingmeng/d54a1d69e40ba7bb02dfc696d6666e77 Description: expand below ------------------- This video is me go over the most common ways to create an Ethereum account. I explain the tradeoffs between each method and go super indepth into explaining how each way differs. All in all with these 3 methods you should be equipped in the majority of situations
Views: 288 Ling Qing Meng
Geth communication
 
19:00
Geth is the Go implementation of the Ethereum protocol. This tutorial demonstrates 4 ways to communicate with Geth: - Console mode using the JavaScript Runtime Environment - Script mode using the JavaScript Runtime Environment - Using HTTP (HypertextTransfer Protocol) The geth flags rpcapi, rpccorsdomain and rpc are explained. - Using IPC (Inter Process Communication) using the geth.ipc file. The geth flag ipcdisable is explained. This tutorial also explains what JSON-RPC is. Check out all my other Ethereum related tutorial videos https://goo.gl/eNJVXe Subscribe to my YouTube channel: https://goo.gl/61NFzK The presentation used in this video tutorial can be found at: https://goo.gl/snd1F4 JavaScript Runtime Environment https://github.com/ethereum/go-ethereum/wiki/JavaScript-Console JSON RPC API https://github.com/ethereum/wiki/wiki/JSON-RPC Management APIs https://github.com/ethereum/go-ethereum/wiki/Management-APIs Web3.js API https://github.com/ethereum/wiki/wiki/JavaScript-API Mobilefish.com: Using web3 API with MetaMask http://www.mobilefish.com/download/ethereum/web3api.html #mobilefish #howto #ethereum #geth
Views: 3753 Mobilefish.com
Web3.js Utilities · Web3.js · #8 Ethereum Blockchain Development Crash Course
 
13:52
► SUBSCRIBE TO THIS CHANNEL ◄ For more videos on how to build decentralized applications on The Ethereum Blockchain: https://www.youtube.com/channel/UCY0xL8V6NzzFcwzHCgB8orQ?sub_confirmation=1 DOWNLOAD FREE VIDEO COURSES: http://www.dappuniversity.com/free-download How to Build Ethereum Dapp (Decentralized Application Development Tutorial) https://youtu.be/3681ZYbDSSk Donate Ether to the channel: 0x39C7BC5496f4eaaa1fF75d88E079C22f0519E7b9 Website: http://dappuniversity.com/ Follow me on Twitter (@DappUniversity): https://twitter.com/DappUniversity Email me: [email protected]
Views: 663 Dapp University
Inside Ethereum Transactions · Web3.js · #3 Ethereum Blockchain Development Crash Course
 
38:33
► SUBSCRIBE TO THIS CHANNEL ◄ For more videos on how to build decentralized applications on The Ethereum Blockchain: https://www.youtube.com/channel/UCY0xL8V6NzzFcwzHCgB8orQ?sub_confirmation=1 DOWNLOAD FREE VIDEO COURSES: http://www.dappuniversity.com/free-download How to Build Ethereum Dapp (Decentralized Application Development Tutorial) https://youtu.be/3681ZYbDSSk Donate Ether to the channel: 0x39C7BC5496f4eaaa1fF75d88E079C22f0519E7b9 Website: http://dappuniversity.com/ Follow me on Twitter (@DappUniversity): https://twitter.com/DappUniversity Email me: [email protected]
Views: 2097 Dapp University
Ethereum Programming for Noobs - Web 3.0
 
25:12
Today we are going to do some web development using Ethereum web3 Javascript library and build a simple webpage that interacts with the Ethereum blockchain. YOU DO NOT TO BE A PROGRAMMER to follow this video. Hope you enjoy guys! VISUAL STUDIO CODE: https://code.visualstudio.com/ NODEJS: https://nodejs.org/en/download/ METAMASK: https://metamask.io/#how-it-works WEB3: https://github.com/ethereum/web3.js/tree/1.0 NODEJS SERVE PACKAGE https://www.npmjs.com/package/serve Thanks for watching guys 💝 🎓 Join my online academy https://academy.ivanontech.com 🎓 Interested in Smart Contract Programming? Sign up here: https://eepurl.com/dkHOT9 📣 Join Telegram channel https://t.me/joinchat/AAAAAE2xJE4l8xhC8MU4cg 🎤 If you would like me to speak at your conference, book me here: https://ivanontech.com 🍻 Join the crypto discussion forum - https://thecrypto.pub 📚 Get my free e-book on Bitcoin and Blockchain - http://eepurl.com/c0hyc9 you will receive the book in your inbox once you sign up 👫👭👬Social: LinkedIn: http://linkedin.com/in/ivanliljeqvist/ Instagram: http://instagram.com/ivanontech/ Steemit: https://steemit.com/@ivanli Facebook: http://facebook.com/ivanontech/ Exclusive email list: http://eepurl.com/c0hyc9 🤑 Buy cryptocurrencies: https://www.coinbase.com/join/529bab0ab08ded7080000019 💰 Secure your Crypto with Hardware Wallets: Ledger: https://www.ledgerwallet.com/r/4607 Trezor: https://trezor.io/?a=rvj3rqtje3ph DISCLAIMER: This is NOT financial advice. This is just my opinions. I am not responsible for any investment decisions that you choose to make. Ivan on Tech is all about cryptocurrencies and the technology behind Bitcoin, Ethereum, Litecoin, Ripple, IOTA. We also cover Bitcoin price, altcoin price, investing, analytics, different altcoins. Ivan on Tech by Ivan Liljeqvist
Views: 9622 Ivan on Tech
Ethereum dApp tutorial - Front end. Part 2
 
17:39
Continue from where we left off. In this video we'll extract a specific variable from the Ethereum blockchain and present it to the user. I'll also provide a quick run on how to use the meteor add-on frozman:template-var (https://atmospherejs.com/frozeman/template-var). This add-on isn't really necisery when trying to interact with the Ethereum blockchain, but I find it very useful when trying to display variables from within callback functions. The browser compiler can be found here: https://ethereum.github.io/browser-solidity/#version=soljson-latest.js And the previous videos can be found here: https://www.youtube.com/playlist?list=PLH4m2oS2ratdoHFEkGvwvd7TkeTv4sa7Z I've also created a post in my blog to match this video. Be sure to check it out! http://zeltsinger.com/2016/10/18/ethereum-dapp-front-end-display-variables/
Views: 17942 Shlomi Zeltsinger
Deploying Smart Contracts · Web3.js · #4 Ethereum Blockchain Development Crash Course
 
22:31
► SUBSCRIBE TO THIS CHANNEL ◄ For more videos on how to build decentralized applications on The Ethereum Blockchain: https://www.youtube.com/channel/UCY0xL8V6NzzFcwzHCgB8orQ?sub_confirmation=1 DOWNLOAD FREE VIDEO COURSES: http://www.dappuniversity.com/free-download How to Build Ethereum Dapp (Decentralized Application Development Tutorial) https://youtu.be/3681ZYbDSSk Donate Ether to the channel: 0x39C7BC5496f4eaaa1fF75d88E079C22f0519E7b9 Website: http://dappuniversity.com/ Follow me on Twitter (@DappUniversity): https://twitter.com/DappUniversity Email me: [email protected]
Views: 1349 Dapp University
Frontend Web Applications On Ethereum 3 - Sending Tokens | Blockchain
 
16:28
The full code for this lesson is located here: https://github.com/what-the-func/func-wallet/tree/frontend-ethereum-part3 In this video we continue working on the Func Wallet example from the previous video. We're now able to view basic wallet information and our Ether and Token balances. The next step is implementing the "Send Tokens" component. Remix - Solidity IDE - https://remix.ethereum.org Solidity Documentation - https://solidity.readthedocs.io/en/develop/ ERC20 Standard - https://github.com/ethereum/eips/issues/20 EthereumJS TestRPC - https://github.com/ethereumjs/testrpc Web3JS - http://web3js.readthedocs.io/en/1.0/ 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: 3961 What The Func?
Solidity Event Listener in Web3
 
15:24
In todays video we will look at how we can listen for events using the Web3 API. We will build a simple webpage that fetches data from a smart contract and will update it when events fire in the contract. The code is available here: https://github.com/filipmartinsson/Solidity/tree/master/bankevent
Views: 530 Filip Martinsson
Writing Smart Contracts · Web3.js · #5 Ethereum Blockchain Development Crash Course
 
23:24
► SUBSCRIBE TO THIS CHANNEL ◄ For more videos on how to build decentralized applications on The Ethereum Blockchain: https://www.youtube.com/channel/UCY0xL8V6NzzFcwzHCgB8orQ?sub_confirmation=1 DOWNLOAD FREE VIDEO COURSES: http://www.dappuniversity.com/free-download How to Build Ethereum Dapp (Decentralized Application Development Tutorial) https://youtu.be/3681ZYbDSSk Donate Ether to the channel: 0x39C7BC5496f4eaaa1fF75d88E079C22f0519E7b9 Website: http://dappuniversity.com/ Follow me on Twitter (@DappUniversity): https://twitter.com/DappUniversity Email me: [email protected]
Views: 1016 Dapp University
Exploring Ethereum with Web3 Tutorial: Part 3 - Reading Smart Contract Events
 
12:34
Get FREE access to more content like this at http://www.techmaker.tv. Get a quick and easy understanding of how you can interact with Ethereum via Javascript. In this episode, we look at what it means to create an ERC20 compliant smart contract on the Ethereum network, and we look at how to read the event stream with Web3.js. Helpful Links: Ethereum - http://ethereum.org/ Web3 - http://web3js.readthedocs.io/en/1.0/ Infura - http://infura.io/ Etherscan - http://www.etherscan.io
Views: 192 TechmakerTV
Learn Smart Contracts · Web3.js · #2 Ethereum Blockchain Development Crash Course
 
21:06
► SUBSCRIBE TO THIS CHANNEL ◄ For more videos on how to build decentralized applications on The Ethereum Blockchain: https://www.youtube.com/channel/UCY0xL8V6NzzFcwzHCgB8orQ?sub_confirmation=1 DOWNLOAD FREE VIDEO COURSES: http://www.dappuniversity.com/free-download How to Build Ethereum Dapp (Decentralized Application Development Tutorial) https://youtu.be/3681ZYbDSSk Donate Ether to the channel: 0x39C7BC5496f4eaaa1fF75d88E079C22f0519E7b9 Website: http://dappuniversity.com/ Follow me on Twitter (@DappUniversity): https://twitter.com/DappUniversity Email me: [email protected]
Views: 2587 Dapp University
Future of Web3 Java Ethereum ecosystem - Ivaylo Kirilov, blk.io
 
06:49
Discussion about web3j (Web3 Java Ethereum Ðapp API) with Ivaylo Kirilov from https://blk.io Learn more at https://ChronoLogic.Network
Views: 53 ChronoLogic
Создание web-приложения для взаимодействия с блокчейном Ethereum на платформе Meteor
 
16:47
Курсы по разработке на Ethereum: http://ethereumworks.com/?ch=yts&utm_source=yts&utm_medium=youtubesl&utm_campaign=youtubesl&utm_term=youtubesl. Telegram чат для разработчиков: https://t.me/smart_contracts_dev; Самые свежие новости и статьи по криптокодингу - https://t.me/cryptocoding_news Предыдущее видео (создание и запуск первого умного контракта в сети Ethereum) - https://www.youtube.com/edit?o=U&video_id=Afr_PakSW5g Проект Meteor - https://www.meteor.com/ API пакета Web3 JavaScript - https://github.com/ethereum/wiki/wiki/JavaScript-API Sublime Text - https://www.sublimetext.com/ BAT файл для запуска Geth - https://drive.google.com/open?id=0B3_WGJKO-9L7X3hUbTFqZWFHWEk Cвязаться со мной можно через Skype - v.poskonin (Mouse Po). Канал можно поддержать отправив донат на биткоин-кошелек: 17Zs1nhgBB92CeCxFbbB7WhT9MdypJAj1d, или кошелек Ethereum: 0x9740Cd40296744a0aE2aFD115933a791Da4c2AD8.
Ethereum for Python Developers
 
12:02
Everything you need to know to get started with Ethereum with Python. Piper Merriam Ethereum Foundation python team lead.
Views: 3407 Ethereum Foundation
Ethereum Dapp with React JS, Webpack, Web3 & Truffle
 
32:05
► SUBSCRIBE TO THIS CHANNEL ◄ For more videos on how to build decentralized applications on The Ethereum Blockchain: https://www.youtube.com/channel/UCY0xL8V6NzzFcwzHCgB8orQ?sub_confirmation=1 DOWNLOAD FREE VIDEO COURSES: http://www.dappuniversity.com/free-download The Ultimate Ethereum Dapp Tutorial http://www.dappuniversity.com/articles/the-ultimate-ethereum-dapp-tutorial Follow me on Twitter (@DappUniversity): https://twitter.com/DappUniversity Email me: [email protected]
Views: 6084 Dapp University
Web3.js 1.0
 
18:51
Speaker: Fabian Vogelsteller
Views: 4500 Ethereum Foundation
Tutorial dapp with Solidity, Truffle, Web3 and Javascript
 
36:08
In this video, I tried to explain how to make simple dapp, app based on blockchain and Ethereum platform. App is consistent from Backend part smart contract written in Solidity using framework Truffle. Solidity is Ethereum language for writing smart contracts and Truffle is the most popular development framework for Ethereum with a mission to make your life a whole lot easier. During development we use testrpc. Testrpc is a Node.js based Ethereum client for testing and development. It uses ethereumjs to simulate full client behavior and make developing Ethereum applications much faster. It also includes all popular RPC functions and features (like events) and can be run deterministically to make development a breeze. In these way, we work on the local test network, not on the real network where we would spend real Gas. We use web3 to make your app work on Ethereum. Web3 object provided by the web3.js library. Under the hood, it communicates to a local node through RPC calls. web3.js works with any Ethereum node, which exposes an RPC layer. In frontend we connect with web3 we interact with backend blockchain and performing certain transactions. Then in standard way, we represent it in frontend with JS. For serving app we use Lite-Server Lightweight development only node server that serves a web app, opens it in the browser, refreshes when html or javascript change, injects CSS changes using sockets, and has a fallback page when a route is not found. Written version of this tutorial is here http://truffleframework.com/tutorials/pet-shop If you like the tutorial please leave the comment, subscribe and if you want, be free to donate some crypto: BTC: 12mqJi98dbS6xov4RrcYk2xhLnmZAyksYt ETH: 0x1cDB80B7a34F9fAC75AEC6ea4B68c985cBEA3c14 BCC: 8Fk2gHog9YMFUZUJcrGxFU2TtMPmwBtyW5 Write what you would like to see next, which blockchain development tutorial.
Views: 21104 Blockchain Talks
Ethereum Überweisung in PHP / deutsch
 
11:46
Ein Beispiel, wie man mit seiner Ethereum-Wallet und einem PHP-Skript automatisiert einen Betrag überweisen kann. Der Entwicklung einer eigenen Ether/Ethereum Onlineüberweisungs-Plattform oder einem Glücksspiel-Portal steht damit nichts mehr im Weg ;) Die Beispiel-Scripte sind in diesem Artikel verlinkt: http://www.zen-systems.de/ethereum-anwendungen-in-php/
Ethereum Web3/Solidity Workshop
 
01:02:42
Repo: https://github.com/cmditch/hodl-box Slides: https://goo.gl/4tr56k Demo: https://cmditch.github.io/hodlbox (Run testrpc in the background)
Views: 3108 ETHDenver
Building And Deploying Ethereum Smart Contracts With Solidity and JavaScript
 
23:14
Watch this talk to learn how to build smart contracts on top of Ethereum platform. We will also cover how to use Solidity and JavaScript for smart contracts development as well as how to design and deploy basic contract to the Ethereum blockchain. EVENT: Talk recording from AmsterdamJS March 2018 Meetup SPEAKER: Mikhail Kuznetcov PERMISSIONS: AmsterdamJS Meetup Organizer provided Coding Tech with the permission to republish this video. CREDITS: Amsterdam JSNation YouTube channel: https://www.youtube.com/channel/UCQM428Hwrvxla8DCgjGONSQ
Views: 6881 Coding Tech
Ultimate Intro to Ethereum Ðapp Development [Part 12] - Oracles and Oraclize
 
12:37
Video Notes: https://gist.github.com/AlwaysBCoding/556a9a47f75c2950b3a3035197594230 This is Part 12 of a 24 part screencast series outlining everything you need to know in order to get started building Ðapps in Ethereum. The series covers creating an Ethereum development environment, how to use various Javascript libraries to interact with the Ethereum protocol, simple ways to send transactions to the main Ethereum network, how to write and test smart contracts, how to run your own Ethereum node, how to mine Ether, adventures into undergraduate computer science, and more. These videos were recorded in November 2016, so some of the information might be slightly dated. Crypto Donation Links: BTC: 1HewuvpGP1fwprdcg2yru5ss28tGCo4wg8 ETH: 0xC46CDe805aCC8e7507E53E36486C7D8600559d65 XMR: 42HvHqtwg2dcZqDfLZjK8Xc8LyFKN7i3XCipbVSFDJLVGsdUN5pT3e7LExz9QTaGzdGdrEohXzvkeFmdZK1MPGX92xqftUn
Views: 3647 Decypher Media
04. Capturing Smart Contract Events in our User Interface (Solidity)
 
10:14
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 weekly! My Patreon: https://www.patreon.com/designcourse 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: 20898 DesignCourse
IoT + Ethereum -- Raspberry Pi, NodeJS, Web3 & Solidity Pt1: Blink an LED on events
 
30:21
A basic led blinking example, driven by smart contract events. *Github ( https://github.com/nacmonad/eth-iot-examples/) Pre-Requisites: Node JS - https://github.com/nodesource/distributions Ethereum Test RPC - https://github.com/ethereumjs/testrpc Remix - Solidity Browser Compiler - https://github.com/ethereum/browser-solidity Web3 -- https://github.com/ethereum/web3.js 0:00-10:00 --- pi node js server 10:00-20:30 --- TestRPC and Browser-Solidity 20:30-FIN --- WEB3 and interacting with Smart Contract ERRATA: @10:20 -- the mnemoic is used to generate the 10 public/private keypairs and has nothing to do with the coinbase @22:22 -- coinbase is just the wallet public key that is associated with the Web3 instance. has nothing to do with genesis blocks.
Views: 1660 rustcity
Get transactions by address - Etherscan api with python 3 tutorial 3
 
19:46
source code: http://pysource.com/2018/01/17/get-transactions-by-address-etherscan-api-with-python-3-tutorial-3/
Views: 621 Pysource
How To Send Ethereum Transactions
 
03:30
How To Send Ethereum Transactions http:///www.Blockgeeks.com You can send transactions between any two accounts on Ethereum. Typically, these transactions occur in the production environment called the Mainnet but there’s also a few test networks available for us to use. Test networks are useful when you want to use Ethereum without having to pay real money. Some of the popular test nets today are Ropsten, Rinkeby and Kovan. Properly functioning test environments are a critical part of the DAPP development process. Ropsten, which is the main public network and uses proof of work has become prone to spammy transactions and slowness. In response to this, two separate community efforts led to the creation of new test nets, Rinkeby and Kovan. These networks require authenticating using your GitHub account and the transactions are validated using proof of authority meaning there are a small set of validators. Let’s try to send a transaction over the Rinkeby test net. We’ll use a Chrome plugin called MetaMask to connect to the network and make transactions. I highly recommend getting MetaMask since it makes interacting with the Ethereum blockchain extremely easy. First, we’ll change the network to Rinkeby to make sure we’re using test ether and not real ether. Let’s create two test accounts and label them. To get test ether into these accounts, we need to use a tool called a Faucet which is just a website where you enter your address and it sends you some test ether. Let’s copy the address for one of our accounts. When we click the buy button, we get redirected to the Faucet. Since we’re connected to Rinkeby, we need to use our GitHub credentials to get the test ether. To do this, go to gist.github.com, create a new Gist with a single line that contains the address you just copied and publish it. You then copy the Gist URL and paste it into the Faucet. In a few short moments, we can see that we have updated the balance in our account. The reason the balance took a few seconds to update is because we need to wait for the transaction to get mined on the Rinkeby network. Now, let’s move this test ether between our accounts. First, let’s copy the address of our receiving account. Then, we click the send button, paste the address, as well as the amount and hit submit. Once we submit the transaction, we’re provided a transaction hash which we can use to reference this transaction. If we use an Ethereum blockchain explorer like Etherscan, we can get more details about this transaction. Since we made the transaction on the Rinkeby network, we have to use rinkeby.etherscan.io and we can see that the transaction is still waiting to be mined. Once it is successfully mined, we’ll see a block number assigned to the transaction. We can then verify the updated account balances using MetaMask. To learn more about Ethereum, check out our online guides and courses at blockgeeks.com. Thanks for watching and see you next time.
Views: 4386 Blockgeeks
Ethereum Tutorial - JS Decentralized Apps with Ethereum
 
12:23
Learn more advanced front-end and full-stack development at: https://www.fullstackacademy.com Arnoldo Mora shows you the basic concepts to understand the Ethereum Blockchain ecosystem, its history and why this is a great moment to get started developing with it. You will be able to start using the basic tool set of the JS-Ethereum developer. Will go through a fully functional demo app with Node.js, TestRPC, Truffle and Web3.js in just 10 minutes. Clone, install, run and get started!
Views: 9060 Fullstack Academy
Inspecting Blocks · Web3.js · #7 Ethereum Blockchain Development Crash Course
 
15:37
► SUBSCRIBE TO THIS CHANNEL ◄ For more videos on how to build decentralized applications on The Ethereum Blockchain: https://www.youtube.com/channel/UCY0xL8V6NzzFcwzHCgB8orQ?sub_confirmation=1 DOWNLOAD FREE VIDEO COURSES: http://www.dappuniversity.com/free-download How to Build Ethereum Dapp (Decentralized Application Development Tutorial) https://youtu.be/3681ZYbDSSk Donate Ether to the channel: 0x39C7BC5496f4eaaa1fF75d88E079C22f0519E7b9 Website: http://dappuniversity.com/ Follow me on Twitter (@DappUniversity): https://twitter.com/DappUniversity Email me: [email protected]
Views: 592 Dapp University
Intro  - Etherscan API with python 3 Tutorial 1
 
18:13
source code: http://pysource.com/2018/01/16/intro-etherscan-api-with-python-3-tutorial-1/
Views: 1346 Pysource
Building Dapps with Web3 and Meteor
 
19:36
I created this video with the YouTube Video Editor (http://www.youtube.com/editor)
Views: 1406 Jeff Anthony
[이더리움 dAPP 만들기] web3.js 라이브러리 맛보기
 
15:39
Management API : https://github.com/ethereum/go-ethereum/wiki/Management-APIs JSON RPC API : https://github.com/ethereum/wiki/wiki/JSON-RPC#go html 파일에 adding web3.js : https://github.com/ethereum/wiki/wiki/JavaScript-API#adding-web3 이더리움 dAPP 만들기 튜토리얼 기초 과정입니다. 이 강의에서 다룰 주제로는 Geth, Web3.js, Solidity, Truffle.js, Mist 등이 있고 추후에 더 추가될계획입니다. 기초과정 이후 Advanced 과정에서는 이더리움 코어 스터디와 4세대 블록체인 Openhash platform에대한 스터디를 진행합니다 질문이 있거나 이해가안가시는분들은 댓글로 남겨주세요. 이메일 : [email protected] 페이스북 : https://www.facebook.com/seungju.chae.9
Views: 101 Solidify
dApp Development with Web3 and JavaScript
 
31:45
Now that we’ve built the smart contract, how can we interact with it as a user from a web browser? We’ll show you how dApp development works with web3 and metamask.
Views: 152 ANZ Coders
How To Create Ethereum Wallet Address and Send / Receive ETH
 
14:52
A video showing how to create an Ethereum wallet account address and access it using the myetherwallet.com platform. This video shows how to create an address, send & receive funds and backup your wallet information. My Links Website http://www.imineblocks.com Facebook https://www.facebook.com/imineblocks Twitter https://twitter.com/IMineBlocks_com Instagram https://www.instagram.com/imineblocks Steemit https://steemit.com/@imineblocks Buy anything on Amazon US http://amzn.to/1Ttb8P9 UK http://amzn.to/27P0s71 Please use the link below to make your donation in one of the 65 supported Altcoins. http://imineblocks.com/donations/ Tips are appreciated. Here's my Addresses Bitcoin:1FFVvaF7A3sjhzX26mNWfuqYKz1CwmEsYh Litecoin:LUUEfTYzsQU1e86kjiDtkwAYmqReZYAPfs Ethereum:0x5B905114167C80276AD28A997f606C698547fe40 Burstcoin BURST-N8KB-DKKW-9C4W-AF289 Storj 1PtCzyShTUXwhf63nRqQuxEgLZRkjwu4SK Dash:XmVpjUbZ12bK4k8E2LnMJeULeUsLcjAyBe BitSend:iRoCVCDSVTyqqojyybMcbRpFU4HhdosVhP Decred:DseJxmrkYw3FncKWJoEH9SswdcDPuyi4DZF Ethereum Classic:0x0927B3ff51BFC3865788aE7ad90246D850c05325 Nexus:2QyTKoWw38qhXZ144gvDuxcMPunquV4o2CLxFTHa4vBUkj1m4Sh NXT:NXT-VJTM-6E5M-7PZ6-9LSXJ Stratis:ST6bqKBoGtvtrVnStDjiGkcfh29KhZDMmw Vertcoin:VkzcFB4qpWta6txy7kjfx6z2pS4VhmmhCn Zcash:t1QAirDg9e9Gyz1YzWFXvBenjyRQq5iYyxi Monero:48CbEcFkNVEd2JyZCTW4erduVKsbBEkwd9n791ayUQjVDx12yc3oZjqbV2NaqdSSXa3NcnpZdDCYZSQ92DpoSztY8xqRkuw
Views: 92045 IMineBlocks
Building an Ethereum/React App
 
01:38:59
Building an Ethereum/React crowdfunding app.
Views: 1121 RallyCoding
Web3 Goes Live -- Livestreaming Video on the Peer-to-Peer Internet
 
30:32
The web3 stack offers solutions for payment, computation, identity, and storage, but the live media layer is missing. Built on top of Swarm and an open media server called LPMS, the Livepeer project incentivizes live video transcoding and distribution in a fully decentralized way. This enables any user to send a live stream into the network and ensure it can reach all the devices on the planet at any connection speed. This talk will cover the incentives for running nodes, and the solution for scalable verification of transcoding work designed to be built on top of Truebit. Speaker; Eric Tang
Views: 715 Ethereum Foundation