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Ethereum And Web3.js Hello World: Get The Eth Balance Of An Ethereum Address

Ethereum And Web3.js Hello World: Get The Eth Balance Of An Ethereum Address

A site about discovery through experience Ethereum and Web3.js Hello World: Get the ETH Balance of an Ethereum Address Using just 41 lines of HTML + JS, we create a Web3.JS application which can get the ETH Balance of an Ethereum Address [Final Result] [GitHub] For me, the hardest part of learning new technical skills is overcoming the hurdle of simply getting started. The Ethereum development space is booming, and the ability to make relatively simple web applications that interact with the Ethereum blockchain is at a premium. Today, development on World Wide Web requires you to compete with a huge number of fully developed, feature rich applications, where it is very unlikely that you are actually contributing value. However, the same is absolutely not true for Ethereum and blockchain as a whole. There are so many utilities and tools that can bring value to this ecosystem, all with relatively low feature requirements.So let's overcome the first barrier by building a "Hello World" application.From my perspective, the perfect project for something like this would be a bare-bones single-page application which fetches the ETH balance of an Ethereum address. This is about as simple as it gets to allow a user to interact with the blockchain, and thanks to Web3.js, it is also really simple to implement! To gain access to the Ethereum network, you will need to gain access to a Web3 Provider. As I will talk about more below, this comes natively with certain Ethereum focused browsers, but for the average user you will need to provide them with their own gateway to the blockchain. Basically, you need someone to provide your app the data that is actually on the blockchain, and Web3.js has the ability to interact directly with an HTTP Provider to bring you this data with minimal Continue reading >>

Xbt Provider Ab Ethereum Tracker One (eth.xbt)

Xbt Provider Ab Ethereum Tracker One (eth.xbt)

The Wealth 150 is a list of what we believe are the best funds in all the main sectors. For a fund to be selected for the Wealth 150 it must pass a rigorous selection process, and we continually monitor the list to ensure it only contains the best funds. The Wealth 150 is a list of what we believe are the best funds in all the main sectors. For a fund to be selected for the Wealth 150 it must pass a rigorous selection process, and we continually monitor the list to ensure it only contains the best funds. The Wealth 150+ is a selection of our favourite actively managed and tracker funds across the major investment sectors. For a fund to be selected it must pass a rigorous selection process, and we continually monitor the list to ensure it contains only the best funds. We believe Wealth 150+ funds offer the ultimate combination of first-class performance potential and low management charges for UK investors. In many cases these super-low charges are only available through the Vantage Service - a unique benefit to Hargreaves Lansdown clients. The Wealth 150+ is a selection of our favourite actively managed and tracker funds across the major investment sectors. For a fund to be selected it must pass a rigorous selection process, and we continually monitor the list to ensure it contains only the best funds. We believe Wealth 150+ funds offer the ultimate combination of first-class performance potential and low management charges for UK investors. In many cases these super-low charges are only available through the Vantage Service - a unique benefit to Hargreaves Lansdown clients. The Wealth 150+ is a selection of our favourite actively managed and tracker funds across the major investment sectors. For a fund to be selected it must pass a rigorous selection process, and we c Continue reading >>

Xbt Provider

Xbt Provider

Price is updated every 10 minutes, do not base investment decisions on these values. Calculated values on the site are only indicative and price information should be viewed on the underlying exchanges. Fair Value is just an indication of where the market should trade in a Pareto efficient environment. For investors in Germany: please note that the issuer is unable to respond to questions relating to the listings on Boerse Stuttgart and Tradegate. For all question regarding pricing on these markets please refer to your local broker. XBT Provider by CoinShares manages Bitcoin Tracker One, Bitcoin Tracker Euro, Ether Tracker One and Ether Tracker Euro. With these instruments anyone can invest in Bitcoin and Ether as ETPs, exchange-traded tracking certificates, from anywhere in the world. XBT Provider's prospectus is approved by the Swedish FSA (Finansinspektionen) and our products are listed on Nasdaq Nordic in Stockholm. HOW CAN I INVEST IN THE BITCOIN OR ETHER ETPs? Bitcoin Tracker One, Bitcoin Tracker Euro, Ether Tracker One and Ether Tracker Euro are traded in the same manner as any share or instrument listed on the Nasdaq exchange in Stockholm. To invest, you need an account, which is obtained through your bank, advisor or online broker. The product is listed on Nasdaq in Stockholm and is traded during normal opening hours: Monday to Friday, 9:00 to 17:25 (CET). More questions? Please contact your advisor, brokerage or bank. In the event that your current advisor, broker or bank is not a member of the Nasdaq Nordic exchange they will most likely be able to trade through one of their counterparties. Nasdaq Nordic members . Nasdaq (Nasdaq: NDAQ) is a leading provider of trading, clearing, exchange technology, listing, information and public company services across six Continue reading >>

Xbt Provider Launches First Ethereum Exchange-traded Notes

Xbt Provider Launches First Ethereum Exchange-traded Notes

XBT Provider Launches First Ethereum Exchange-Traded Notes The issuer of the worlds first bitcoin exchange-traded notes (ETN), XBT Provider, has announced the launch of the first ethereum ETNs. XBT Provider will launch two exchange-traded notes Ether Tracker One (COINETH) and Ether Tracker Euro (COINETHE). XBT Provider Has Announced the Launch of Two Ethereum ETNs XBT Provider states thatthe two ETNs are denominated in SEK and EUR respectively, and that pricing will track the value of ethereum as determined by an index rate comprising the average of the 3 most liquid of a select group of exchanges, daily. The ETNs will be traded during normal market hours on Nasdaq Stockholm. Laurent Kssis, a representative of XBT Provider, has described the launch of the ethereum ETNs as a response to popular demand from traders. The listing of these two Ether ETNs is a major win for European investors who have been requesting these products for over a year now. As of today, investors can trade [Ethereum] via a safe, familiar route in Nasdaq. Head of ETP Services Europe at Nasdaq, Helena Wedin, stated that while it is important to acknowledge that exposure to an asset in its early stage of development, such as a digital currency, comes with a risk, trading Ether on Nasdaq Stockholm provides investors with the protection provided by a regulated infrastructure, well-known marketplace and accessibility through their ordinary brokers. XBT Provider is a Swedish domiciled company that is owned by Coinshares. The company released the first bitcoin exchange-traded note, Bitcoin Tracker One, which was launched on Nasdaq Stockholm in 2015. XBTs prospectus has been approved by the Swedish FSA (Finansinspektionen). XBT Provider Was Recently Fined by Nasdaq for Rule Violations On September 25, XBT Continue reading >>

Web3 Web3.js 1.0.0 Documentation

Web3 Web3.js 1.0.0 Documentation

var Web3 = require('web3');var web3 = new Web3('orvar web3 = new Web3(new Web3.providers.HttpProvider('change providerweb3.setProvider('ws://localhost:8546');// orweb3.setProvider(new Web3.providers.WebsocketProvider('ws://localhost:8546'));// Using the IPC provider in node.jsvar net = require('net');var web3 = new Web3('/Users/myuser/Library/Ethereum/geth.ipc', net); // mac os path// orvar web3 = new Web3(new Web3.providers.IpcProvider('/Users/myuser/Library/Ethereum/geth.ipc', net)); // mac os path// on windows the path is: "\\\\.\\pipe\\geth.ipc"// on linux the path is: "/users/myuser/.ethereum/geth.ipc" Contains the current available providers. Object - HttpProvider: The HTTP provider is deprecated, as it wont work for subscriptions. Object - WebsocketProvider: The Websocket provider is the standard for usage in legacy browsers. Object - IpcProvider: The IPC provider is used node.js dapps when running a local node. Gives the most secure connection. var Web3 = require('web3');// use the given Provider, e.g in Mist, or instantiate a new websocket providervar web3 = new Web3(Web3.givenProvider || 'ws://remotenode.com:8546');// orvar web3 = new Web3(Web3.givenProvider || new Web3.providers.WebsocketProvider('ws://remotenode.com:8546'));// Using the IPC provider in node.jsvar net = require('net');var web3 = new Web3('/Users/myuser/Library/Ethereum/geth.ipc', net); // mac os path// orvar web3 = new Web3(new Web3.providers.IpcProvider('/Users/myuser/Library/Ethereum/geth.ipc', net)); // mac os path// on windows the path is: "\\\\.\\pipe\\geth.ipc"// on linux the path is: "/users/myuser/.ethereum/geth.ipc" web3.givenProviderweb3.eth.givenProviderweb3.shh.givenProviderweb3.bzz.givenProvider... When using web3.js in an Ethereum compatible browser, it will set with the curren Continue reading >>

Infura - Scalable Blockchain Infrastructure - Ethereum And Ipfs

Infura - Scalable Blockchain Infrastructure - Ethereum And Ipfs

Our mission is to provide the world with secure, stable, and scalable access to Ethereum and IPFS. For Ethereum dapp developers, INFURATM eliminates the need to install, configure, and maintain Ethereum nodes. FerrymanTM is a software layer that improves reliability and helps INFURA scale. Access IPFS seamlessly without the hassle of managing the infrastructure on your own. INFURATM assists the decentralization movement and advances the state of the art by providing ... Public endpoints for the Ethereum Mainnet and all testnet networks For decentralized storage, with custom reliability features Fully compatible with the standard JSON-RPC API and popular web3 libraries A reverse proxy that helps with scaling and reliability Geth and Paritythe most popular clients, both for robustness Permissioned private infrastructure can be set up for your organization Start using INFURATM in a few easy steps! It's an easy signup to get your own access token. Use one of these test or production INFURATM endpoints as your Ethereum client provider. Add your Access Token to the end of the URL. Below is a quick command line example using CURL. $ curl -X POST \ -H "Content-Type: application/json" \ --data '{"jsonrpc": "2.0", "id": 1, "method": "eth_blockNumber", "params": []}' \ "$ {"jsonrpc": "2.0","result": "0x3ccb11", "id":1} where the "0x3ccb11" will be replaced with the block number of the most recent block on that network. You can read more about getting started with INFURATM in this blog post . A fast Ethereum API for decentralized applications Running and syncing Ethereum blockchain nodes can be time-consuming and requires lots of storage. Regular end-users may have a hard time keeping their clients in sync. We take care of devops with reliable transaction processing so you can foc Continue reading >>

Providers Web3.py 4.0.0 Documentation

Providers Web3.py 4.0.0 Documentation

Deprecated: This provider is deprecated in favor of EthereumTesterProvider and the newly created eth-tester. class web3.providers.eth_tester.TestRPCProvider This provider can be used for testing. It uses an ephemeral blockchainbacked by the ethereum.tester module. This provider will be slowerthan the EthereumTesterProvider since it uses an HTTP server for RPCinteractions with. AutoProvider is the default used when initializing web3.Web3 without any providers. Theres rarely a reason to use itexplicitly. Web3 supports the use of multiple providers. This is useful for cases whereyou wish to delegate requests across different providers. To use this feature,simply instantiate your web3 instance with an iterable of provider instances. >>> from web3 import Web3, HTTPProvider>>> from . import MySpecialProvider>>> special_provider = MySpecialProvider()>>> infura_provider = HTTPProvider('web3 = Web3([special_provider, infura_provider]) When web3 has multiple providers it will iterate over them in order, trying theRPC request and returning the first response it receives. Any provider whichcannot respond to a request must throw aweb3.exceptions.CannotHandleRequest exception. If none of the configured providers are able to handle the request, then aweb3.exceptions.UnhandledRequest exception will be thrown. Continue reading >>

Payment Provider Bitrefill Runs Successful Lightning Transaction Test

Payment Provider Bitrefill Runs Successful Lightning Transaction Test

Payment Provider Bitrefill Runs Successful Lightning Transaction Test Dec 29, 2017 at 21:31 UTC|UpdatedDec 29, 2017 at 21:43 UTC Faster and cheaper bitcoin transactions may soon go alive. A recent transaction posted on Twitter from inside the offices of prepaid phone payment provider, Bitrefill, used the Lightning network to top up a mobile (for real) at near instant speed with zero fee, as the Tweet touted. While such transaction is not yet generally available to the public and may still be largely limited to command line interfaces, it nonetheless gives a peek into how the future may look like for regular bitcoin users. Mainnet Lightning Network paying my actual phone bill with actual Mainnet funds on @bitrefill . Speed: Instant. Fee: Zero. Future: Almost Here. pic.twitter.com/futhn502Lp Alex Bosworth (@alexbosworth) December 28, 2017 Lightning has been one of the most watched bitcoin-scaling solutions. It's a new layer of abstraction atop the bitcoin protocol that allows transactions to occur more quickly and cheaply, without sacrificing the security. According to data site Bitinfocharts , currently the average transaction fee of bitcoin is at $36. Yet, people who saw Bosworth's tweet may have been confused because the use case isn't visible to Bitrefill customers. According to CEO Sergej Kotliar, the transaction shown occurred when Bosworth was testing out Bitrefill's implementation with one of the company's developers, by invitation. Bosworth needed to refill his phone at the time anyway, so he decided to test it with real money. It worked. "Everything is ready to go on our end, but we're not launching it yet until a Lightning wallet is released for general use on mainnet." Wallets need to be updated in order to interact with the Lightning protocol layer, and this Continue reading >>

Ethereum - Remix | Not Possible To Connect To The Web3 Provider - Stack Overflow

Ethereum - Remix | Not Possible To Connect To The Web3 Provider - Stack Overflow

REMIX | Not possible to connect to the Web3 Provider I had an error to run on web3 provider (localhost:8545) Not possible to connect to the Web3 provider. Make sure the provider is running and a connection is open (via IPC or RPC). I'm running geth on my local and I gave some options to connect with remix and testnet. $ geth testnet rpc rpcapi db, net, web3, personal rpccorsdomain console I gave the -rpccorsdomain becuase the remix is on https. anyway, check the 'web3 prover' on Run tab in remix IDE. Then, modified the address like ' ' not the ' '. I don't know the reason why but it worked anyway when I fixed like that.I made my accounts and did something. However, I had to redownload the geth again in some reason. (I've changed my pc). and I'm syncing the blocks right now. I think the syncing is not finished yet because the the blockNumber is 0. so... I'm waiting now but I'm wondering that the error could occur when eth.syncing is not completely done. Continue reading >>

Using Infura (or A Custom Provider) | Truffle Suite

Using Infura (or A Custom Provider) | Truffle Suite

Infura is a hosted Ethereum node cluster that lets your users run your application without requiring them to set up their own Ethereum node or wallet. You may not be familiar with Infura by name, but if you've used MetaMask then you've used Infura, as it is the Ethereum provider that powers MetaMask. For security reasons, Infura does not manage your private keys, which means Infura cannot sign transactions on your behalf. However, Truffle can sign transactions through the use of its HDWalletProvider. This provider can handle the transaction signing as well as the connection to the Ethereum network. ( Read more about HDWalletProvider .) This tutorial will show you how to use Infura to migrate an existing dapp to an Ethereum network supported by Infura. In this specific instance, we'll migrate to Ropsten. We'll assume that you already have a dapp to migrate. If you want a test dapp, feel free to use our Pet Shop tutorial dapp. Truffle's HDWalletProvider is a separate npm package: Note: If you are on Windows and get an MSBUILD error, you may need to install the Windows build tools. In a terminal with Administrator rights, run npm install -g windows-build-tools and then try installation again. Before you can use Infura, you need to register for an Infura Access Token . Fill out the form and you will receive your token. Your information will be sent to your email and displayed on the screen. Make sure you save this token and keep it private! The next step is to edit your truffle.js file to use HDWalletProvider and provide all the necessary configuration for deploying to Ropsten. First, define the HDWalletProvider object in your configuration file. Add this line at the top of your truffle.js file: var HDWalletProvider = require("truffle-hdwallet-provider"); Next, provide a r Continue reading >>

Providers Api Ethers.js 3.0.0 Documentation

Providers Api Ethers.js 3.0.0 Documentation

This automatically creates a FallbackProvider backed by INFURA and Etherscan; recommended var providers = require('ethers').providers;// Connect to Ropsten (the test network)// You may specify any of:// - boolean; true = ropsten, false = homestead// - object; { name: 'ropsten', chainId: 3 } (see ethers.networks);// - string; e.g. 'homestead', 'ropsten', 'rinkeby', 'kovan'var network = providers.networks.ropsten;// Connect to INFUAvar infuraProvider = new providers.InfuraProvider(network);// Connect to Etherscanvar etherscanProvider = new providers.EtherscanProvider(network);// Creating a provider to automatically fallback onto Etherscan// if INFURA is downvar fallbackProvider = new providers.FallbackProvider([ infuraProvider, etherscanProvider]);// This is equivalent to using the getDefaultProvidervar provider = providers.getDefaultProvider(network)// Connect to a local Parity instancevar provider = new providers.JsonRpcProvider('network);// Connect to an injected Web3's provider (e.g. MetaMask)var web3Provider = new providers.Web3Provider(web3.currentProvider, network); All properties are immutable, and reflect their default value if not specified, or ifindirectly populated by child Objects. These are relatively low-level calls. The Contracts API shouldusually be used instead. Send the read-only (constant) transaction to a single Ethereum node andreturn a Promise with the result (as a hex string ) of executing it.(See Transaction Requests ) This is free, since it does not change any state on the blockchain. Send a transaction to a single Ethereum node and return a Promise with theestimated amount of gas required (as a BigNumber ) to send it.(See Transaction Requests ) This is free, but only an estimate. Providing too little gas will result in atransaction being reject Continue reading >>

Deploy To Ethereum Network (from Browser-solidity)

Deploy To Ethereum Network (from Browser-solidity)

0x037c897d77109a0d99186e7456ca7f52f2deae9f Unlike when deploying to local JavaScriptVM, it takes a while for the above state change (state registered in block). If there is no change on the screen all the time in this state, there is a possibility that registration has failed. (When checking with the browser's DevelopmentMode, it often occurs that JavaScript has caused an error.) BrowserSolidity is still under development and depending on the Version the Create operation may fail. In that case, please adjust the version of BrowserSolidity or try to deploy directly from the command line shown in the following section. Set "HelloWorld" in the same way as when running in local JavaScriptVM. Enter "Hello World" and press 'setGreeting'. Wait for the transaction to be issued and enter the block. A transaction is created and the results are displayed. If you press 'getGreeting', the value of the field will be retrieved. Since this process is contant, it does not involve issuing transactions, so the results are displayed immediately. Deployed contracts are instantiated on the BlockChain, so you can specify addresses to retrieve them. Press 'AtAddress' and the address of the contract you created in the dialog 0x037c897d77109a0d99186e7456ca7f52f2deae9f You can load deployed contracts as described below. Continue reading >>

Ether Tracker Euro Xbt Provider

Ether Tracker Euro Xbt Provider

Data delayed at least 15 minutes, as of Mar 28 2018 08:28 BST. Make up to three selections, then save.0 of 3 selected The Ethereum Certificates will provide an exposure to the performance of the digital currency Ethereum as priced in USD on the Primary Marketplaces. Holders of the Ethereum Certificates will have exposure to both the performance of Ethereum and the fluctuations in the relevant 18 foreign exchange rate (for Ethereum Certificates denominated in SEK, USD/SEK and for Ethereum Certificates denominated in EUR, USD/EUR). The performance data shown in tables and graphs on this page is calculated in GBX of the fund/index/average (as applicable), on a Bid To Bid / Nav to Nav basis, with gross dividends re-invested on ex-dividend date. Past performance is not necessarily a guide to future performance; unit prices may fall as well as rise. The videos and white papers displayed on this page have not been devised by The Financial Times Limited ("FT"). FT has not selected, modified or otherwise exercised control over the content of the videos or white papers prior to their transmission, or their receipt by you. The videos, white papers and other documents displayed on this page are paid promotional materials provided by the fund company. Any prospectus you view on this page has not been approved by FT and FT is not responsible for the content of the prospectus. The information made available to you does not constitute the giving of investment advice or an offer to sell or the solicitation of an offer to buy any security of any enterprise in any jurisdiction. The securities listed above are not registered and will not be registered for sale in the United Sates and cannot be purchased by U.S. investors as the securities can only be purchased in jurisdictions where they Continue reading >>

Github - Joincivil/react-ethereum-provider: Inject Web3 Provider Into Your React App

Github - Joincivil/react-ethereum-provider: Inject Web3 Provider Into Your React App

If nothing happens, download GitHub Desktop and try again. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. A simple provider to make it easier to connect to web3 / Ethereum. Note that your App must be wrapped in an component that passes in the web3 object. This library is still a work in progress. I intend to build out more methods as they are required in our apps. # npmnpm install react-ethereum-provider --save# yarnyarn add react-ethereum-provider import React from 'react'import { withEthereum } from 'react-ethereum-provider'const MyComponent = (props) => { const connected = props.ethereum.connected if(connected === null) return Loading... else if (!connected) return Not connected to Ethereum else { return Connected to Ethereum! }}export default withEthereum()(MyComponent) import React from 'react'import Web3 from 'web3'import { EthereumProvider } from 'react-ethereum-provider'import ExampleComponent from './ExampleComponent'export default () => { return ( )} Currently this library expects web3.js, however I think I might abstract it a bit to accept either EthJS or web3.js in the future.Send a pull request if you add something useful! Continue reading >>

Github - Metamask/provider-engine: A Javascript Library For Composing Ethereum Provider Objects Using Middleware Modules.

Github - Metamask/provider-engine: A Javascript Library For Composing Ethereum Provider Objects Using Middleware Modules.

A JavaScript library for composing Ethereum provider objects using middleware modules. If nothing happens, download GitHub Desktop and try again. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Web3 ProviderEngine is a tool for composing your own web3 providers . Built to be modular - works via a stack of 'sub-providers' which are like normal web3 providers but only handle a subset of rpc methods. The subproviders can emit new rpc requests in order to handle their own; e.g. eth_call may trigger eth_getAccountBalance, eth_getCode, and others.The provider engine also handles caching of rpc request results. const ProviderEngine = require('web3-provider-engine')const CacheSubprovider = require('web3-provider-engine/subproviders/cache.js')const FixtureSubprovider = require('web3-provider-engine/subproviders/fixture.js')const FilterSubprovider = require('web3-provider-engine/subproviders/filters.js')const VmSubprovider = require('web3-provider-engine/subproviders/vm.js')const HookedWalletSubprovider = require('web3-provider-engine/subproviders/hooked-wallet.js')const NonceSubprovider = require('web3-provider-engine/subproviders/nonce-tracker.js')const RpcSubprovider = require('web3-provider-engine/subproviders/rpc.js')var engine = new ProviderEngine()var web3 = new Web3(engine)// static resultsengine.addProvider(new FixtureSubprovider({ web3_clientVersion: 'ProviderEngine/v0.0.0/javascript', net_listening: true, eth_hashrate: '0x00', eth_mining: false, eth_syncing: true,}))// cache layerengine.addProvider(new CacheSubprovider())// filtersengine.addProvider(new FilterSubprovider())// pending nonceengine.addProvider(new NonceSubprovide Continue reading >>

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