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Javascript Ethereum Miner

Is It Possible To Mine Ethereum With Javascript ? - Ethermining

Is It Possible To Mine Ethereum With Javascript ? - Ethermining

Is it possible to mine ethereum with JavaScript ? I am wondering if it's possible to mine ethereum with using JavaScript code, I know it sounds inefficient, but still it's interesting theoretically, if does, I will be glad to receive some links about getting started mining them (not has to be specific for JS). Yes, but afaik no JS miner currently exists. It would basically be a less efficient version of the native CPU miner (highest rate I've seen reported is like 1MH/s), and it would not be profitable in any way unless you plan on embedding it into a page and duping people into visiting it -- though most likely this would just lock up their browser and cause them to close it before it manages to do any useful amount of work. Thanks guys,any references for building an miner ?BTW, ethereum already using PoS ? and whenever they will use it, * there will be any importance for mining power at all ?? * lets consider that I don't have a starting stake (no significant amount of ethereum to validate - which is needed as I understand in Proof of Stake algorithm) Besides sheer novelty why would you want to do this? I was thinking this could be a solution for people annoyed with web ads but not destroying a person's profits if the user uses an ad blocker. Why not in the background do a tiny bit of mining? Not enough to cause a freeze up, certainly, or have any real impact on the client computer as well - test test test! There is no reason to not be up front with the person visiting you page - let them know you are providing a service and there are just some computing cycles you are using on their computer in exchange. If the site is popular (online newspapers/blogs/discussion areas - are some sites that may have use of this that come to mind), these could add up. If the person us Continue reading >>

Build Your First Ethereum Smart Contract With Soliditytutorial

Build Your First Ethereum Smart Contract With Soliditytutorial

Finance & Tech Nerd, Investor, Blockchain & Crypto Enthusiast, Wannabe Polymath, Master of Discipline in Training, Laissez Faire. Talk Is Cheap. Build Your First Ethereum Smart Contract with Solidity Tutorial So you wanna build a smart contract? Perhaps you want to understand how they work, maybe you want to build your own Dapp, maybe you want to launch the very first billion dollar ICO (sarcasm)... Regardless of your intentions, learning how smart contracts work is invaluable. The Ethereum platform possesses enormous potential to create Dapps that could change the way we interact on the web in the decades to come. While Ethereum deploys smart contracts that work much like a standard blockchain transaction, they yield a conditional statement that must be met before a function(s) is executed. Smart contracts can be used for voting, crowdfunding, blind auctions, multi-signature wallets and MUCH more. Bob has his own scrap metal depot business in the United States, Eric is his iron scrap supplier. Eric is based out of China. Bob and Eric have a GREAT business relationship. They trust each other and have been doing business for a long time. Both have booming businesses, and Bob in particular sells out of iron scrap on a routine basis. Bob deploys a contract where once his iron scrap inventory reaches a certain range, he automatically sends an order out to Eric for X lbs of iron scrap at Y ether per ton. Eric agrees to the arrangement and accepts Bobs payment in ether right away. Eric gets to work right away and starts fulfilling Bobs order. Eric can exchange his ether at a local exchange online for Yuan for a tiny fee and itll be processed instantaneously. Whether Eric decides to hold ether or convert to Yuan is his choice, but either way he can now put this capital to wor Continue reading >>

Tutorial 3: Introduction To The Javascript Api

Tutorial 3: Introduction To The Javascript Api

We are going to take a quick look at some of the bindings in the Javascript API and how they can be used to build powerful front ends for your dapps. To start with it's important to understand that all of our functions are asynchronous and return promises. This avoids problems that arise when synchronous javascript functions block the running of other code and hold up the other functions that. If you are not familiar with promises I advise you to take a moment to read up on their use before proceeding as they can be quite confusing for the novice user. For those of you who are comfortable with promises, lets dive in. We are going to be using the below html/javascript template and we will add new javascripts function while explaining what they do. We will not be using any custom libraries and our only aesthetic choice will be to use bootstrap to make things look nice. JavaScript API ///First web3.eth.watch code to monitor coinbase ///Insert your contract address var here: ///Second web3.eth.watch code to monitor block number JavaScript API

Coinbase Address:
Balance:
Latest Block Number:
Latest Block Timestamp:
Latest Block Hash:
Contract String:
Favourite Python:
Take the above and paste it into your preferred text editor and save it as a html file somewhere convenient. Now open Alethzero and use the browser to navigate to it. You should see the below: We have listed several pieces of information; Coinbase Addre Continue reading >>

Awesome Ethereum Awesome Ethereum

Awesome Ethereum Awesome Ethereum

Homestead - 2: Homestead < HERE WE ARE. Metropolis - 3: Metropolis - when we finally officially release a relatively full-featured user interface for non-technical users of Ethereum Serenity - 4: Serenity - Switching the network from Proof of Work to Proof of Stake ( Casper). end of 2016?. Ethereum Visual Identity - Ethereum Visual Identity Guide. Remembering a time where the price of Ether was 2000 ETH per BTC Launching the ether sale - Blog post of the July 22nd 2014 explaining the crowfunding. Intended use if revenue - Intended use of revenue. The Ethereum Foundations mission is to promote and support research, development and education to bring decentralized protocols and tools to the world that empower developers to produce next generation decentralized applications (DAPPs), and together build a more globally accessible, more free and more trustworthy Internet. Casper - Casper - Proof of Work (PoW) for Serenity. an upcoming P2P messaging protocol that will be integrated into the EtherBrowser.* Whisper Wiki Wiki article about Whisper ( December 2014)-* Whisper ? - What is Whisper and what is it used for?. Ethereum compatible JavaScript API which implements the Generic JSON RPC spec.* web3-j GitHub - GitHub Repo.* web3-j documentation - web3-j documentation. Gas is the fundamental network cost unit and is paid for exclusively in ether.* Gas Doc - Gas and transaction costs from the Ethereum Documentation.* What is Gas? - What is the Gas in Ethereum? -Post from CryptoCompare.* Cost calculator - Calculate the cost of conducting a transaction or executing a contract on Ethereum. Continue reading >>

Coinhive Cryptocurrency Miner Is 6th Most Common Malware, Says Report

Coinhive Cryptocurrency Miner Is 6th Most Common Malware, Says Report

CoinHive Cryptocurrency Miner Is 6th Most Common Malware, Says Report Nov 14, 2017 at 12:00 UTC|UpdatedNov 14, 2017 at 12:01 UTC Cyber-security solutions provider Check Point Software has said that the threat from cryptocurrency mining malware is rapidly growing. According to the company's latest Global Threat Impact Index report, the CoinHive variant became the sixthmost-used malware in October. CoinHive - a JavaScript program that lurks unseen on websites - works by tapping the processing power of visitors' computers to mine monero. Maya Horowitz, threat intelligence group manager at Check Point, said ina press release that the emergence of mining malware like CoinHive highlights the "need for advanced threat prevention technologies" to curb such practices and protect networks from cyber-criminals. "Crypto mining is a new, silent, yet significant actor in the threat landscape, allowing threat actors to make significant revenues while victims' endpoints and networks suffer from latency and decreased performance." According to the report, malware variant RoughTed (adware) topped the index, followed by Locky (ransomware) and Seamless (traffic redirection). Recently, internetdomain provider Cloudflare suspended websites that ran hidden cryptocurrency miners, including that ofthe operator of torrent siteProxyBunker. This site was said to be running the Coinhive miner for four days prior to the suspension. The leader in blockchain news, CoinDesk is a media outlet that strives for the highest journalistic standards and abides by a strict set of editorial policies . CoinDesk is an independent operating subsidiary of Digital Currency Group, which invests in cryptocurrencies and blockchain startups. Continue reading >>

Programming Ethereum Smart Contract Transactions In Javascript

Programming Ethereum Smart Contract Transactions In Javascript

Programming Ethereum smart contract transactions in JavaScript Programming Ethereum smart contract transactions in JavaScript By Mikko Ohtamaa 11 months ago. Tagged under web3 , ethereum , javascript , dapp , geth , parity , webpack , nodejs , solidity , solc . This a tutorial blog post and web application showing how to deploy an Ethereum smart contract and transacting with this contract from a web user interface. The web application written using JavaScript, React user interface library and Bootstrap theming. The application is coded in ECMAScript 2016 and wrapped together using Webpack module bundler. For the deployment of the contract Go Ethereum JSON-RPC API is used. The production web application communicates with Ethereum blockchain using Etherscan.io API service for pushing out transactions from the web application. All private keys are held 100% on the client side and transaction is constructed in JavaScript, making the example optimal to follow if you are working with non-custodian wallets or Dapps. We use both command line Node.js tools and browser based JavaScript in this demo. View the example application source code on Github . You need to be comfortable in advanced JavaScript programming. You need to have geth (Go-Ethereum) node or any Ethereum node software running in a Ethereum Ropsten testnet. See below how to install and connect to one safely. You need to be comfortable working on a command line in UNIXy environment, though Windows works also Interact with Ethereum blockchain over both Go-Ethereum JSON-RPC connection and EtherScan.io API Interact with smart contracts from web browser JavaScript Deploy a smart contract from a command line Generate private and public key pair offline Push transactions through etherscan.io API or optional sign tranactio Continue reading >>

Go Ethereum - How To Use Miner.start(2) From Javascript - Ethereum Stack Exchange

Go Ethereum - How To Use Miner.start(2) From Javascript - Ethereum Stack Exchange

How to use miner.start(2) from javascript Got Following example to run miner from javascript: var mining_threads = 1function checkWork() { if (eth.getBlock("pending").transactions.length > 0) { if (eth.mining) return; console.log("== Pending transactions! Mining..."); miner.start(mining_threads); } else { miner.stop(0); // This param means nothing console.log("== No transactions! Mining stopped."); }}eth.filter("latest", function(err, block) { checkWork(); });eth.filter("pending", function(err, block) { checkWork(); });checkWork(); I am not able to use miner.start(mining_threads). Currently, I am using the following libraries: If you're using this by uploading the script through the JavaScript console (loadScript) in Geth, it should work. galahad Aug 14 '16 at 18:02 Attaching error info will help to resolve. A.K. Aug 23 '16 at 5:33 did you figure out how to use miner.start() in js file? I got same problem. When it is running and I clicked the function of miner.start(), that warns I dont have a module for miner.start(). Jorden Gao Feb 7 '17 at 16:16 Continue reading >>

Go Ethereum - How To Use Miner.start(2) From Javascript - Ethereum Stack Exchange

Go Ethereum - How To Use Miner.start(2) From Javascript - Ethereum Stack Exchange

How to use miner.start(2) from javascript Got Following example to run miner from javascript: var mining_threads = 1function checkWork() { if (eth.getBlock("pending").transactions.length > 0) { if (eth.mining) return; console.log("== Pending transactions! Mining..."); miner.start(mining_threads); } else { miner.stop(0); // This param means nothing console.log("== No transactions! Mining stopped."); }}eth.filter("latest", function(err, block) { checkWork(); });eth.filter("pending", function(err, block) { checkWork(); });checkWork(); I am not able to use miner.start(mining_threads). Currently, I am using the following libraries: If you're using this by uploading the script through the JavaScript console (loadScript) in Geth, it should work. galahad Aug 14 '16 at 18:02 Attaching error info will help to resolve. A.K. Aug 23 '16 at 5:33 did you figure out how to use miner.start() in js file? I got same problem. When it is running and I clicked the function of miner.start(), that warns I dont have a module for miner.start(). Jorden Gao Feb 7 '17 at 16:16 Continue reading >>

Browser-based Cryptocurrency Mining Makes Unexpected Return From The Dead

Browser-based Cryptocurrency Mining Makes Unexpected Return From The Dead

Browser-Based Cryptocurrency Mining Makes Unexpected Return from the Dead Once thought of as dead, browser-based cryptocurrency mining makes an unlikely return, coming back to haunt websites and their visitors. Browser-based cryptocurrency mining activity exploded in the last few months of 2017. After many years of deathly silence, the catalyst appears to be the launch of a new browser-based mining service in September by Coinhive. This service wraps everything up nicely in an easy-to-use package for website owners and has injected new life into an idea that was long thought of as dead and buried. Browser-based cryptocurrency mining is not new;it's been around since at least 2011. A surge in the cryptocurrency market in 2017, as well as availability of coins that are mineable using home hardware and easy-to-use JavaScript APIs, has led to a torrent of malicious browser-based mining affecting many well-known and lesser-known websites. Mobile devices have not been spared from cryptocurrency mining, as witnessed by a 34 percent increase in the number of mobile apps incorporating cryptocurrency mining code. Browser-based mining, as its name suggests, is a method of cryptocurrency mining that happens inside a browser and is implemented using scripting language. This is different compared to the more widely known file-based cryptocurrency mining approach which involves downloading and running a dedicated executable file. Browser-based mining dates back to May of 2011 when an innovative service called BitcoinPlus.com was initially launched back when Bitcoin was cheap and mining was easynot to be confused with another cryptocurrency known as Bitcoin Plus.org (XBC). That service was in many ways remarkably similar to its modern reincarnation, Coinhive. It used JavaScript code f Continue reading >>

Try Out Ethereum Using Only Nodejs Andnpm!

Try Out Ethereum Using Only Nodejs Andnpm!

Try out Ethereum using only nodejs andnpm! Image modified from Ethereum is a decentralized smart contract platform. In this tutorial we will go through deploying and interacting with a smart contract using only nodejs and npm. This will bring you through many useful tools created by other developers. $ npm install [email protected] [email protected] [email protected] [email protected] Next, obtain an address and its private key using MyEtherWallet . First, type in a password to encrypt your wallet file and download your wallet file. Then upload your wallet file to view your private keys. Next, obtain some Ether so that transactions can be sent. We will be using the Rinkeby testnet and their Ether can be obtained for free at this faucet . Follow the instructions and with your address obtained above, use that at the faucet for free Ether. Next, check the balance of your account at Etherscan . After the transaction is confirmed, you now have some Ether that can be used to pay for transaction fees. Now, we can start coding, first, we create a new file tryEthereum.js and require all our dependencies. Next, we note down our address and private key from a previous step. var address = '0x8D68583e625CAaE969fA9249502E105a21435EbF'; var key = '1ce642301e680f60227b9d8ffecad474f15155b6d8f8a2cb6bde8e85c8a4809a'; In this tutorial, we will deploy a simple ballot smart contract, vote on one of the proposals and check which proposal has been voted on. An example smart contract written in Solidity can be obtained at Remix . The ballot smart contract code can also be found here in case it is not loaded automatically. The solidity code is compiled into bytecode for execution in the Ethereum virtual machine. The interface provides the mapping for a higher language to interact with the smart con Continue reading >>

How To Mine Ethereum

How To Mine Ethereum "the Easy Way" - An Ethereum Mining Contract?

How to mine Ethereum "the Easy Way" - an Ethereum Mining Contract? How to mine Ethereum "the Easy Way" - an Ethereum Mining Contract? Ethereum is quite difficult to mine on your standard PC as there are quite a few step to go through as can be seen in our comprehensive guide here . If you aren't tech savvy or willing to give a bit of time to getting it up and running yourself, thereis another way. This is where you pay someone else to do it for you and get them to run the mining equipment on your behalf. You can compare all Bitcoin and Ethereum cloud mining contracts here . You can buy your first cloud mining contract with Genesis Mining here . This is called cloud mining. It has been happening for a long time with Bitcoin and a number of reputable providers have come to the fore where you can trust their reputation for them not to run off with your money. This is especially true of Genesis Mining who are the first to set up a batch of Ethereum Mining contracts where all you do is pay them some cash and your up and running as an Ethereum miner - as simple as that - no hassle no playing around with downloading Geth and using command prompt - and most importantly you don't have to maintain it yourself which can be a big issue if you have to keep going to restart your computer. So it saves your time! The reason Ethereum Cloud miners can get better deals is two fold. Firstly they buy in bulk, so they get a discount on all their graphics cards. Secondly they can put their mining machines in low cost locations such as Iceland. This severely reduces the operating costs of running an ethereum mining contract which means they can pass on these savings to you. In fact Genesis mining run their contracts off green energy - so you can say your being green whilst being in the avant- Continue reading >>

Web3.eth Web3.js 1.0.0 Documentation

Web3.eth 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 >>

Javascript Mining - Crypto Mining Blog

Javascript Mining - Crypto Mining Blog

All About BTC, LTC, ETH mining as well as other alternative crypto currencies JSEcoin Self Mining is Now Back Up and Running Again It seems that quite a lot of websites have recently got into crypto mining Monero (XMR) using the Javascript miner provided by Coin Hive without warning their users that there will be such a thing when you visit them. That of course cannot remain undiscovered for long time due to the increased CPU load when visiting these websites and it really is not the best thing to do and not tell your visitors not to mention that you wont be earning that much. You can offer them to open a separate window with the miner as a means to support your website, product or service and then everything could be fine, but not telling them and hoping that they will not find and will not get unhappy is really not fine. In fact besides the web miner that particular service also offers other interesting and useful ways to monetize your traffic with mining, namely the Proof of Work Captcha and PoW Shortlinks that you might want to check out this post however is not about the XMR web miner. This post is about JSEcoin that we have talked about last month as well. It is a project similar in a ways to Coin Hive, but it more than just a web-based miner for an existing crypto coin. It is a whole new crypto currency that can be mined with a dedicated web miner and that you can also embed in your website for your visitors to help support you by mining the coin. Soon after we covered the project they have shut down the function for users to try self mining as there was an influx of new users registering and trying it out, not really a surprise here. Now, a bit later the backend has been upgraded to meet the increased user demand and self mining is back and running just fine an Continue reading >>

Javascript Api | Ethereum Builder's Guide

Javascript Api | Ethereum Builder's Guide

To make your app work with on Ethereum, you can use the web3 object provided by the web3.js library . Under the hood it communicates to a local node through RPC calls . web3.js works with AlethZero, geth and Mist, and also in an external browser if one of the former nodes are running locally. web3 contains the eth object - web3.eth (for specifically Ethereum blockchain interactions) and the shh object - web3.shh (for Whisper interaction). Over time we'll introduce other objects for each of the other web3 protocols. As this API is designed to work with a local RPC node and all its functions are by default use synchronous HTTP requests. If you want to make asynchronous request, you can pass an optional callback as the last parameter to most functions.All callbacks are using an error first callback style: web3.eth.getBlock(48, function(error, result){ if(!error) console.log(result) else console.error(error);}) You will always get a BigNumber object for balance values as JavaScript is not able to handle big numbers correctly.Look at the following examples: "101010100324325345346456456456456456456"// "101010100324325345346456456456456456456"101010100324325345346456456456456456456// 1.0101010032432535e+38 web3.js depends on the BigNumber Library and adds it automatically. var balance = new BigNumber('131242344353464564564574574567456');// or var balance = web3.eth.getBalance(someAddress);balance.plus(21).toString(10); // toString(10) converts it to a number string// "131242344353464564564574574567477" The next example wouldn't work as we have more than 20 floating points, therefore it is recommended to keep you balance always in wei and only transform it to other units when presenting to the user: var balance = new BigNumber('13124.234435346456466666457455567456');balance.pl Continue reading >>

Blockchain: Managing The Blockchain

Blockchain: Managing The Blockchain

[ Back ] With the Web3.js Javascript API, along with other APIs, we can use Javascript to interact with our blockchain. We can see when we attach to our blockchain service that we have APIs such as admin, eth and miner: C:\Program Files\Geth> geth attachWelcome to the Geth JavaScript console!instance: Geth/v1.6.6-stable-10a45cb5/windows-amd64/go1.8.3coinbase: 0xc7552f45deb093cafb47286a0bc9415845ca3735at block: 5181 (Sat, 01 Jul 2017 17:00:48 BST) datadir: d:\eth modules: admin:1.0 debug:1.0 eth:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 web3:1.0 First let's look at the admin JavaScript API: Next let's look at the personal JavaScript API: > personal.listAccounts["0xc7552f45deb093cafb47286a0bc9415845ca3735", "0x0851db3e133a15cd1c32531ffff96b4526e3cbcd"]> personal.newAccount('Password')"0xe9d07dcfea16a68bba57ad026ac2cdb65f77eae3"> personal.listAccounts["0xc7552f45deb093cafb47286a0bc9415845ca3735", "0x0851db3e133a15cd1c32531ffff96b4526e3cbcd", "0xe9d07dcfea16a68bba57ad026ac2cdb65f77eae3"]> personal.unlockAccount('0xc7552f45deb093cafb47286a0bc9415845ca3735','Qwerty')true > web3.version.api"0.18.1"> web3.version.node"Geth/v1.6.6-stable-10a45cb5/windows-amd64/go1.8.3"> web3.version.network"1"> web3.version.ethereum"0x3f"> web3.sha3("hello")"0x1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8" In Ethereum we use Kecca-256 (pronouced as "Ket-chak") for our hashing function. We can try and test [ here ]. Now, let's look at some more properties and functions of the Web3 API: > web3.toHex("Hello")"0x48656c6c6f"> web3.toAscii("0x68656c6c6f")"hello"> web3.toDecimal("0x1234")4660> web3.fromDecimal(4660)"0x1234"> web3.fromWei(eth.getBalance(eth.accounts[0]), "ether")25905.288230376151511744> web3.toWei(0.01, "ether")"10000000000000000"> web3.toBigNumber(10000 Continue reading >>

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