向问好 Say HELLO to INFURA.Our mission is to provide the world with secure, stable, fault tolerant and scalable Ethereum and IPFS nodes.INFURA的使命是提供给世界安全的，稳定的，容错性的，和可扩展的以太坊和IPFS节点 Ethereum Nodes For Ethereum ÐApp developers, INFURA™ eliminates the need to install, configure, and maintain Ethereum nodes.IPFS Nodes IPFS enables the creation of completely distributed applications.Access IPFS seamless from your decentralized application without the hassle of managing the infrastructure on your own.Service Layer The INFURA™ Service Layer called Ferryman™ provides advanced routing of requests, load balancing, failover and usage tracking capabilities.The world will be decentralized when Ethereum is ubiquitous and every person is hosting his or her own node.We eagerly await that day.Until that day comes, INFURA will assist the decentralization movement and advance the state of the art by providing the people with a gateway to Ethereum and IPFS.

INFURA is for Everyone.Join those already leveraging INFURA.INFURA is a service of ConsenSys, a venture production studio.ConsenSys builds decentralized applications, enterprise solutions and developer tools for blockchain ecosystems, focusing primarily on Ethereum.Galano Founder and Chief Infrastructure Engineer Herman Junge Founder Maurycy Pietrzak Founder and Chief Software Engineer Michael Wuehler Founder and Product Development Manager INFURA Health    |    Documentation    |    API    |    Privacy Policy    |    Terms of Service A formation Copyright © 2017 ConsenSys Inc.INFURA is a trademark of ConsenSys AG.Site Template by BlackTie.co - Attribution License 3.0 - 2013By Mikko Ohtamaa 5 months ago.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.You can view and try the demo application here: 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 You need to have solc installed 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 tranactions offline Sample Solidity contract source code Install Node version 7.2.1 or later.

Use nvm script to make this easy for you.This demostration is built Ethereum Ropsten testnet in mind.The public testnet is ideal for cases where you don't want to spend any money to test your contracts, but you still want to share them publicly and use public blockchain explorers to debug your contracts.Ropsten testnet mining difficulty is very low and anyone can mine some testnet ETH there using the CPU.ukash to bitcoin ukNote that running a private testnet usin geth is still much faster alternative, transaction delay wise, compared to the public testnet.bitcoin price alarm androidYou can run geth on a server (2GB VPS) and then connect it to using SSH tunneling to avoid the CPU burden and sync delays on your local development laptop.bitcoin lohnt sichSee here how to deploy geth securely on a server and then build a SSH tunnel from your local development computer to server running geth See another blog post how to set up geth with password protected JSON RPC The demo app has a text input that directly takes your Ethereum account private key.bitcoin hashrate over time

A private key is just a 256 bit number.You can generate one easily from a passphrase using sha3 hash in node console.Then generate a private key from a passphrase in Nod console: To get a matching Ethereum address for your private key: Make sure JSON-RPC is available on http://localhost:8545.Connect to your geth and send some balance from geth coinbase address to this address: Check your coinbase address has some balance: Unlock your coinbase account so that you can do withdraws from it: Transfer 0.1 ETH to your private key address as generated above: See my demo transaction in Etherscan Ropsten explorer.ethereum nodeWe use the following sample smart contract for the demo: Note: You can skip this step if you want as there is already a deployed test contract here.bitcoin calculator audGeth JSON-RPC API running at http://localhost:8545 connected to Ropsten testnet (see below for geth info) You need to have balance on your Geth coinbase account (run --mine to generate some) First compile the contract to create contracts.json ABI definitions: Then you can deploy the contract using the attached deploy.js script.

The sample deployment script is a JavaScript script that reads contract ABI definitions and communicates with geth over JSON-RPC using web3 wrapper: See a sample deployed contract Sign up to Etherscan.io and create API key there Now when your contract is deployed, you have a private key to your account, you have your Etherscan.io API key, you can make some calls to the contract.Either run the app locally (below) or directly use the hosted version.The transaction is constructed offline using contract address, private key, nonce and function description see here.The raw transaction (payload) is pushed to Ethereum network over EtherScan.io eth_sendRawTransaction (pushTx) endpoint.The transaction data payload is 32-bit hash of the Solidity function signature, like setValue(uint), and all function arguments serialized as 256-bit parameters (2000 = 0x00000000000000000000000000000000000000000000000000000000000007d0).The transaction can also carry value as ETH that get added to the ethers hold by the smart contract itself.