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Build A Simple Ethereum + Interplanetary File System (ipfs)+ React.jsdapp.

Build A Simple Ethereum + Interplanetary File System (ipfs)+ React.jsdapp.

Build a simple Ethereum + InterPlanetary File System (IPFS)+ React.jsDApp. Click here to share this article on LinkedIn It is prohibitively expensive to store a lot of data on the Ethereum blockchain. According to Ethereums yellow paper it is approximately 20,0000 gas for 256bit/8 bytes (1word). Based on 02/28/2018 gas prices of 4 gwei/gas. See: for current prices. 20,000 gas per Transaction of 8 bytes x 4 gwei/gas = 80,000 gwei for 8 bytes. 80,000 gwei for 8 bytes. x 1000bytes/8 = 10,000,000 gwei/kB =.01 Ether .01 Ether/kB x 1000kB = 10 Ether to store a 1Mb at $860/ether = $8600.00! It would cost $8,600,000.00 to store a 1 GB file on the Ethereum blockchain! To store Ethereums 38 page PDF yellow paper (520Kb) = $4472 USD. See: for conversions. If we can only afford to store a couple of Kb of data on the blockchain, then we would still have to rely on a centralized server to store data. Thankfully, a solution to store data on decentralized network called the InterPlanetary File System (IPFS) is available. See: to read more. When looking up files in IPFS, you are asking the network to find nodes storing the content behind a unique hash. From IPFSs own website: IPFS and the Blockchain are a perfect match! You can address large amounts of data with IPFS, and place the immutable, permanent IPFS links into a blockchain transaction. This timestamps and secures your content, without having to put the data on the chain itself. A simple DApp to upload a document to IPFS and then store the IPFS hash on the Ethereum blockchain. Once the IPFS hash number is sent to the Ethereum blockchain, the user will receive a transaction receipt. We will use Create-React-App framework to make a front-end. This Dapp works with any user that has MetaMask installed in their browser. This is what 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 >>

Infura Scalable Blockchain Infrastructure

Infura Scalable Blockchain Infrastructure

Home Decentralized applications Ethereum Infura Scalable Blockchain Infrastructure Infura Scalable Blockchain Infrastructure Infura provides scalable access to blockchain technologies like Ethereum and IPFS . Infura is built by team under the umbrella of ConsenSys which is a blockchain venture production studio. ConsenSys has global team building an ecosystem of consumer-centric products and enterprise solutions using blockchain technologies, primarily Ethereum. Setting up you Infura infrastructure is as simple as just registering and providing your email address. Once you enter your email address, based on the type of networks you need access to for example Ethereum Mainnet, Test or IPFS etc, Infura then emails you your private https urls to the respective networks. The urls will be associated with your unique access token, so that only you can use the urls. Your Infura urls are under SSL. You might be able to use Infura infrastructure without providing access tokens, but then there is a throttle on your requests. Also , Infura relieves developers from setting up test and main net infrastructure for building Decentralized applications. It provides a service layer which talks to Infura based Ethereum and IPFS nodes. Infura takes care of issues like syncing of multiple ethereum nodes or setting up your testnet. Infura already serves 1 billion requests per day. The best part is Infura provides JSON-RPC pass through , which matches exactly with existing Ethereum JSON-RPC methods. Apart from that Infura also provides REST based API interactions instead of JSON-RPC as well. Here are the key useful features of Infura: TLS-enabled Ethereum endpoints :Public endpoints for the Ethereum Mainnet and all testnet networks. TLS-enabled IPFS gateway:For decentralized storage, with cu Continue reading >>

Myetherwallet Partners With Infura For Enhanced Infrastructure Support

Myetherwallet Partners With Infura For Enhanced Infrastructure Support

MyEtherWallet Partners With INFURA For Enhanced Infrastructure Support On Thursday, June 29, INFURA announced that it has partnered with MyEtherWallet (MEW) and will provide MEW with dedicated back-end infrastructure. Additional node capacity will take some pressure off the web-based wallet provider. INFURA has announced a partnership with MyEtherWallet to facilitate transactions within the Ethereum network. Native node support by INFURA will be integrated into the MEW platform. As explained in INFURAs Medium post announcement, In the MEW interface, on the top right menu, there is a selection box that allows you to choose your preferred node. Simply select infura.io and your MEW session will be connected to INFURA. INFURA will support MyEtherWallets mainnet and testnet networks, relieving MEW of its high-volume traffic. MEW receives a peak of 1,000 transaction requests per second. It might be easiest to think about this with an analogy. If MEW primarily manufactures automobiles (wallets), then INFURA provides on-ramps (nodes) to access the freeway (the Ethereum blockchain). Although MEW has 10 of its own nodes, additional capacity through INFURA will ease its burden. While this alleviates one of the limiting factors in Ethereums lag, INFURA indicates that enhanced node support is just one step toward network scalability. Node overload has become obvious as cryptocurrency enthusiasts race to invest in token offerings. Founders of INFURA and MyEtherWallet expressed their delight at the new partnership. INFURA is thrilled to be working with MyEtherWallet to support the growing Ethereum ecosystem, said Michael Wuehler, co-founder of INFURA. Both projects have earned deep respect among the developer communities and share the same vision of facilitating and simplifying the u Continue reading >>

Web3js - To Which Remote Ethereum Nodes Does Metamask Plugin Send Signed Transactions? And Are They Exposed To Denial Of Service Attacks? - Ethereum Stack Exchange

Web3js - To Which Remote Ethereum Nodes Does Metamask Plugin Send Signed Transactions? And Are They Exposed To Denial Of Service Attacks? - Ethereum Stack Exchange

To which remote ethereum nodes does Metamask plugin send signed transactions? and are they exposed to denial of service attacks? So Metamask allows in it UI to connect to different ethereum nw (public/ testnet) right. If so, can I setup similar service on my machine without subjecting my machine to DOS attack and affecting my machine? How can I do this? 1) INFURA ( ) maintains those remote nodes. 2) You can trust those nodes for two reasons: Uptime and Relay of signed transactions (as opposed of keeping your private key in our servers). We strive to keep an uptime of 100% (which is our latest record). Transaction-wise, it is you, from your local machine the one that signs the transaction with your private key. That way you don't need to worry that we can use your account for malicious purposes. All that INFURA does is relaying that transaction to the network to be mined. 3) Everybody can setup the same service in their machine. You just need to run a local node and synchronise it with the network you want, then open the RPC to receive transactions only from 127.0.0.1, this means, only your machine can send signed transactions and reading requests to that node. If you set up the RPC feature to listen 0.0.0.0, you will be exposed to attacks from the outside. Other security suggestions, but more advanced to implement, would be to setup a firewall to incoming requests to your machine to the RPC port and staying behind your home router (that's pretty enough in most cases). TLDR: INFURA is the remote service behind metamask. INFURA does not keep your private keys, what you send is the only thing that gets relayed. INFURA core competence is keeping nodes in the network synchronized, releasing the user to worry about that matter. Continue reading >>

Designing The Architecture For Your Ethereum Application

Designing The Architecture For Your Ethereum Application

Developer and Security Researcher at Zeppelin Solutions. Designing the architecture for your Ethereum application As you are beginning with Ethereum development, and after going through some of the many excellent tutorial posts out there, you are faced with the challenge of building your first Ethereum-based app. This brings up a set of new challenges around designing the architecture and layout of your application: traditional client-server applications now have a third new component in the mix, the blockchain. In this article Ill cover some of the most traditional scenarios for Ethereum applications, which arise from the different interactions between these three components. Ill discuss serverless apps, browser plugins, private nodes, offline signing, and other issues that play a role when designing the layout of your solutions. The canonical flavour of an Ethereum app is a serverless one, where the entire flow of your app happens entirely between the client and the blockchain. The first step here is to actually distribute the client code to your users. The easiest way is to set up a static page that contains a web3-enabled web app. Such page can be hosted anywhere: AWS S3 , Google Cloud , Github pages , other cloud providers, or your own server. Furthermore, if you can count on your clients having either bzz or ipfs protocol support, you can even disitribute it via Swarm or IPFS for total decentralization. Next step is for the app to be able to read information from the blockchain, which, as you already know, requires a connection to an active Ethereum node. This will be set by your web3 provider , which is the piece that handles the actual web3 connection to a node. Now, some of your users may already have an established connection to a node, for instance, via the 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 >>

Why Infura Is The Secret Weapon Of Ethereum Infrastructure

Why Infura Is The Secret Weapon Of Ethereum Infrastructure

A blockchain venture production studio building decentralized applications on Ethereum. Go to www.consensys.net and subscribe to our newsletter. Why Infura is the Secret Weapon of Ethereum Infrastructure Find out how platforms like Metamask, CryptoKitties, Status, and UJO all utilize Infura for scalable blockchain solutions Building a decentralized future is about more than tokenomics or cryptography, institutional adoption or even regulation. For Ethereum and the entire blockchain ecosystem to grow, it falls on the community to build the infrastructure components that keep the network running. Across the Ethereum network, there is a need for utilities that lower the barrier of entry and simplify access to Ethereum data. Among the most essential of these are Infrastructure-as-a-Service (IaaS) products. Leading the way is Infura , which offers developers a suite of tools to connect their apps to the Ethereum network and other decentralized platforms. Many of the blockchain spaces most remarkable projects Metamask , CryptoKitties , UJO , Radar Relay , Cipher Browser , uPort utilize Infuras APIs to connect their applications to the Ethereum network. In doing so, Infura provides the fundamental infrastructure required to handle both the short-term spikes that can often occur during token launches and essential, longer-term scaling solutions. An average of 6.5 billion JSON-RPC requests per day on the Ethereum network are channeled through Infura infrastructure, making the project an essential pillar of the ecosystem. Our mission is to facilitate access to Ethereum and the opportunities it provides, says Infura Lead Systems Engineer Nicola Cocchiaro. Weve always believed that only through widespread adoption can the enormous potential of Ethereum be fully realized. One of th Continue reading >>

Sample Nodejs App To Query The Ethereum Blockchain

Sample Nodejs App To Query The Ethereum Blockchain

Sample NodeJS app to query the Ethereum blockchain Had a discussion last night with some friends and was really curious how to develop applications utilising blockchain technology. I found the Ethereum API a few months back but I was not clear on how to start until last night. Eric, a former colleague, blogged about a sample on how to do it in Java using Spring Boot and Thymeleaf. One key thing in his blog was the use of the Infura API rather than spinning up a node to communicate with the Ethereum blockchain. Check out his blog "My first foray into the world of blockchain" . Inspired by all of this, I tried web3js which Eric suggested. web3js , an Ethereum Javascript API, is developed by the Ethereum team. I came up with a basic nodeJS sample below using web3js. It's basically the nodeJS version of what Eric has done in his blog . Really simple stuff but I needed to figure out things for a few hours to get it running. require('dotenv').config();var BigNumber = require('bignumber.js');var Web3 = require('web3')var web3 = new Web3(new Web3.providers.HttpProvider(process.env.API_URL));var balance = web3.eth.getBalance(process.env.ACCOUNT, function (error, result) { if (!error) { console.log(web3.utils.fromWei(new BigNumber(result), 'ether')); } else { console.error(error); } }); Continue reading >>

Radar Relay Api

Radar Relay Api

parity --jsonrpc-hosts=all \ --jsonrpc-interface=all \ --ws-origins=all \ --ws-hosts=all \ --ws-interface=all \ --chain=mainnet \ --base-path /path/for/ethereum_node_data (use --chain=kovan to run the Kovan testnet) Install the latest version of Geth for your platform . Running a full archive node will allow for you to obtain the maximum amount of information from the Ethereum blockchain, however, this can often take a full week to fully sync. A light node allows interaction with the Ethereum blockchain without downloading the entire blockchain. A light node performs worse than a full node, so at this time a light node is not recommended for automated trading. geth --cache 1024 --v5disc --rpc --syncmode fast --gcmode full run geth --help for the full configuration options. Infura provides a public HTTP interface for reading Ethereum state information and sending transactions. Infuras free public API removes the need to run a local node, at the cost of trusting Infura to provide truthful Ethereum state information, to properly relay your transactions to the rest of the network, and to manage your personal information (Ethereum address, IP address, web3 applications used) appropriately. Infura is recommended for testing and resource-restricted environments. Sign up for a free Infura API key: . Infura will work without an API key, but Infura claims that requests without a key are throttled more aggressively. A local unlocked account may be used to connect and execute Ethereum transactions if no other option is available. Warning: running an unlocked account can be dangerous as it exposes access to your Ethereum account. NOTE: This should only be done in a secure isolated environment (behind a firewall). Your account will create a private key and address for you on the blo Continue reading >>

Infura Handled $8 Billion Worth Of Ethereum Transactions In 2017

Infura Handled $8 Billion Worth Of Ethereum Transactions In 2017

Infura Handled $8 Billion Worth of Ethereum Transactions in 2017 Infura, an ethereum and IPFS node service provider, announced today they processed more than 7 million ethereum transactions last year, worth some $8 billion at todays prices. We witnessed an explosion of ICOs and the creation of popular dapps, like CryptoKitties, that pushed transaction traffic on Mainnet through the stratosphere, Infura says before adding: It is common knowledge that Ethereum handles more transaction traffic than all other blockchains combined, and were excited to be relaying a decent chunk of these transactions to the network. Infura is a node infrastructure provider for ethereum dapps, with a number of them using it, including MetaMask and CryptoKitties. They have seemingly grown considerably last year, suggesting dapps are finding increasing usage from ethereans and other cryptonians. Unlike bitcoin, which tries to be just digital gold, or Bitcoin Cash, which tries to increase its currency like usage from traditional merchants, Ethereum aims to build web 3.0. That translates to, in effect, natively blockchenized websites. Towards that aim, they have been building the infrastructure over the past year, with Infura providing the nodes, MetaMask providing an easy connection to the blockchain for both sites and users, while Uport provides identity services when needed and Oraclize provides data feeds. Those building blocks now in place can allow a new project to easily get up and running while maintaining focus on their core services, rather than having to handle the entire infrastructure on their own. They still have the option to do it all in-house, with some in particular perhaps desiring more control over their nodes, but on the user side, dapps usually offer the option to connect to Continue reading >>

Blockchain Infrastructure: Poa Network Partners Withinfura

Blockchain Infrastructure: Poa Network Partners Withinfura

Public platform for smart contracts. An open Ethereum sidechain with Proof of Authority (PoA) consensus by independent validators. Blockchain Infrastructure: POA Network Partners WithInfura POA Network is proud to announce a new partnership with Infura , for enhanced blockchain infrastructure support. Infura will support POAs main network by providing reliable uptime for POA nodes. This will be the first time that Infura has provided access to nodes for a sidechain project. It is a great step forward for POAs mission to grow the Ethereum ecosystem. POA Network is an open, public, permissioned blockchain based on the Ethereum protocol that offers an open source framework for smart contracts. POA Network was developed with the aim of addressing issues that the Ethereum ecosystem is currently facing such as scalability and governance. Infura, part of the ConsenSys umbrella , is an Ethereum and IPFS node service provider that processed more than 7 million Ethereum transactions last year. For over 2 years, Infura has provided thousands of DApp developers with reliable and scalable access to Ethereum nodes. Infura helps bootstrap new p2p infrastructure solutions such as the POA side-chain by acting as a reliable bootstrap core to accelerate the growth of new P2P networks. With the Infura partnership, users of POA can rest knowing that access to the network or POA DApps like the POA Bridge will always be available. The addition of the Infura POA nodes adds another layer of decentralization as it removes the POA R&D team and POA network from being the sole providers of the POA nodes. When it comes to interoperability between Ethereum and POA networks, having both network nodes on Infura will provide a consistent user experience and further add to the decentralization of the ne Continue reading >>

Using Infura With Web3j

Using Infura With Web3j

For obtaining ether to use in these networks, you can refer to Ethereum testnets The web3j infura module provides an Infura HTTP client( InfuraHttpService )which provides support for the Infura specific Infura-Ethereum-Preferred-Client header. Thisallows you to specify whether you want a Geth or Parity client to respond to your request. Youcan create the client just like the regular HTTPClient: Web3j web3 = Web3j.build(new HttpService("web3ClientVersion = web3.web3ClientVersion().send();System.out.println(web3ClientVersion.getWeb3ClientVersion()); Geth/v1.7.2-stable-1db4ecdc/darwin-amd64/go1.9.1 If you want to test a number of the JSON-RPC calls against Infura, update the integration test CoreIT with your Infura URL & run it. For further information, refer to the Infura docs . In order to transact with Infura nodes, you will need to create and sign transactions offlinebefore sending them, as Infura nodes have no visibility of your encrypted Ethereum key files, whichare required to unlock accounts via the Personal Geth/Parity admin commands. Continue reading >>

Introducing Nodeth The Easiest Way To Deploy Secure Ethereum Nodes In The Cloud For Main, Test

Introducing Nodeth The Easiest Way To Deploy Secure Ethereum Nodes In The Cloud For Main, Test

Introducing NodETH the easiest way to deploy secure Ethereum nodes in the cloud for main, test and private networks (free during publicbeta) NodETH is currently in public beta. During this time all nodes are 100% free. Give the service a go and let us know what you think! Nodes are the keepers of the Ethereum network. According to ethernodes.org , right now there are some 22,492 of them. They validate transactions and new blocks. Theyre also the entry point for committing transactions to blockchain and pulling data out of it. In other words nodes are fundamental to web3 applications. Want to deploy a new smart contract? Youre going to have to do it through a node. Want to watch on and react to the state of the blockchain? New blocks? Contract events? You need a node. Want to setup a private network between collaborators on your latest web3 project? Need node. Node need. The point is: if youre a developer working with Ethereum youre going to have to run a node at some point. NodETH takes the hassle out of this. We built NodETH because we were fed up managing and securing servers to power the backend of our dapps. NodETH is an interface for spinning up Ethereum nodes from your web browser. Select a network to connect to (or create a private one), your node type, hit deploy and your node will be running in 5 minutes: Each node is deployed on its own virtual private server in the cloud. Every node is locked down only the JSON RPC API endpoints you select are exposed to the outside world. All connections to APIs are handled over secure TLS connections. We made NodETH to solve a problem for ourselves and now were releasing it along with other tools weve been developing as part of w3k.it . Instead of manually deploying nodes as we need them we now use NodETH in production to Continue reading >>

Alternatives To Remote Node Services Like Infura And Etherscan? - Ethdev

Alternatives To Remote Node Services Like Infura And Etherscan? - Ethdev

Alternatives to remote node services like Infura and Etherscan? you can do that w a 5$ digital ocean server + geth exposing rpc public Could I achieve this with a lite weight full node? What if I ran geth --fast. Would that still work? I found this: geth --fast --rpc --rpcaddr 127.0.0.1 --rpcport 8545 --rpccorsdomain * --rpcapi admin,db,eth,debug,miner,net,shh,txpool,personal,web3 Does this look right? And would the --fast prevent me from having to sync the entire blockchain? He says that: The downside of this is that you wont have the full data for the entire historical blockchain, just the most recent stuff and for new incoming blocks So I should still be able to send transactions, right? you can do that w a 5$ digital ocean server + geth exposing rpc public you cannot currently sync a fast node on a 5USD Digital Ocean :- 25 GB is too small: the chaindata folder size is now over 66 GB- with only one vCPU and 1GB ram it'll take you a month to do the initial sync, the node will crash all the time and it will go out of sync all the time- if you look at the number of github issues raised on the geth repo, you'll see that it's much harder to keep a mainnet node running than people usually think Its going to take you a month to sync to mainnet though with an instance that small Continue reading >>

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