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Ethereum Block Explorer

Private Blockchain - How Could

Private Blockchain - How Could "ethereum Block Explorer" Connect Into Geth That Is Already Running On The Main Server Securely? - Ethereum Stack Exchange

I am working on private Ethereum Network. I run Ethereum boot-node and Ethereum Block Explorer app ( (A lightweight ethereum block explorer.) ) on the main server. Inside the main server where I run Ethereum node, at the browser I could connect into the Ethereum Block Explorer from localhost:8000: But from an external node on the browser, when I try to connect from main server's ip address < ip-address >:8000 I have faced with the following error message. The main reason of this error message was "web3 is not connected" var eth_node_url = '// TODO: remote URLweb3.setProvider(new web3.providers.HttpProvider(eth_node_url));if(!web3.isConnected()) { $('#connectwarning').modal({keyboard:false,backdrop:'static'}) //enters here $('#connectwarning').modal('show') //enters here} On the external node, if I run geth app on the background that is already connected to the private Ethereum network, it solves the problem. [Q] On the external node without running the geth app on the background, is it possible for Ethereum Block Explorer to connect into the geth app that is already running on the main server? If yes, is there a secure approach as running geth with --rpcaddr="localhost" --rpccorsdomain="*" on the main server? Thank you for your valuable time and help. geth --port 3000 --networkid 23422 --nodiscover --datadir="/home/MyEthereumEbloc" --rpc --rpcaddr="localhost" --rpccorsdomain="*" --maxpeers=6 --ipcapi "admin,eth,web3" --autodag => In order to install Ethereum Block Explorer, I have followed the installation guide on . [~$] git clone [~$] cd explorer[~/explorer$] npm start> [email protected] prestart /home/netlab/explorer> npm install> [email protected] postinstall /home/netlab/explorer> bower install> [email protected] start /home/netlab/explorer> http-se Continue reading >>

Blockchain Developer Api For Ethereum | Blockcypher

Blockchain Developer Api For Ethereum | Blockcypher

# ^# / \ _ _# / ^ \ |_) | _ _ | / ._ |_ _ ._#< > |_) | (_) (_ |< \_ \/ |_) | | (/_ |# \ v / / |# \ /# v Welcome to BlockCyphers Ethereum API documentation! If youre familiar with our Bitcoin endpoints, youll feel right at home with our Ethereum API. However, there are a few differences, and they stem in part from the fundamental differences between Bitcoin and Ethereum. In the most abstract sense, Bitcoin and Ethereum are cousins; they both have blocks of transactions linked together into a chain, they both use Proof of Work to reach consensus (for now, as Ethereum plans to move to Proof of Stake in a future release), they are both about decentralizing trust. But thats where the similarities end. Here are just some of Ethereums differences: There are no UTXOs, only accounts (of two varieties) Block time is significantly shorter; 15 second target instead of 10 minutes Miners get rewards for including references to orphan blocks (so called uncle blocks) Ethereums scripting language is far more expressive than Bitcoins; typically advanced transactions/contracts are constructed using a higher level language then converted into EVM bytecode Ethereum has no strict cap on monetary supply (ether supply) Transactions cost gas to run (denominated in ether) depending on how computationally expensive they are to run. Blocks also have total gas limits to prevent runaway computation/keep the network decentralized. In a nutshell, Bitcoin is about decentralized, trust-minimizing, sound money. Ethereum is about decentralized, trust-minimizing, sound computation. Much more detail about these differences can be read at the Ethereum Wiki here. You can find more information at the projects webpage as well. man curl | grep -A 3 "DESCRIPTION"DESCRIPTIONcurl is a tool to transfer data from or Continue reading >>

Mix Blockchain

Mix Blockchain

MIX Blockchain is a smart contract platform for decentralized content. It is fully public. It cannot be censored and no one can be prevented from participating. It is fully programmable at every level. It is a protocol for interconnected content apps that empower the individual. All published content is machine readable providing flexible presentation and analysis. New content types can be created that are backwards compatible. New smart contracts can be written to create new filter bubbles for existing content. MIX runs on its own clone of Ethereum, allowing the community to hard fork if necessary. All software is licensed with Apache 2.0 . Jonathan was a participant in the Drupal web development community for ten years where he created the blockchain Drupal modules Coin Tools and Ethereum. As he fosters the growth of the MIX development community, he endeavours to replicate the vibrancy of the Drupal development community. Ethan is a designer who was trained in user centred design methods. He is funding travel through freelance design, taking on creative challenges from those he meets along the way. His role with MIX is developing a visual identity and graphic media. When not designing, Ethan is seeing new places and cultures, all the while writing, drawing and jotting down ideas. Brian is a Blockchain enthusiast with four years of experience in the field. His draw to MIX is creating a censorship resistant publishing platform as an alternative to the centralized systems that are currently in place today. Outside of Blockchain development he has eight years of experience as a backend software developer. Alina is a web developer with a background in marketing and communications. For MIX she is designing and developing different apps such as the block explorer while tra Continue reading >>

Rinkeby: Ethereum Testnet

Rinkeby: Ethereum Testnet

An archive node synchronizes the blockchain by downloading the full chain from the genesis block to the current head block, executing all the transactions contained within. As the node crunches through the transactions, all past historical state is stored on disk, and can be queried for each and every block. Initial processing required to execute all transactions may require non-negligible time and disk capacity required to store all past state may be non-insignificant. High end machines with SSD storage, modern CPUs and 8GB+ RAM are recommended. To run an archive node, download rinkeby.json and start Geth with: geth --datadir=$HOME/.rinkeby init rinkeby.json geth --networkid=4 --datadir=$HOME/.rinkeby --cache=1024 --syncmode=full --ethstats='yournode:Respect my [emailprotected] ' --bootnodes=enode://a24ac7c5484ef4ed0c5eb2d36620ba4e4aa13b8c84684e1b4aab0cebea2ae45cb [emailprotected] 52.169.42.101:30303 You can download Geth from . A full node synchronizes the blockchain by downloading the full chain from the genesis block to the current head block, but does not execute the transactions. Instead, it downloads all the transactions receipts along with the entire recent state. As the node downloads the recent state directly, historical data can only be queried from that block onward. Initial processing required to synchronize is more bandwidth intensive, but is light on the CPU and has significantly reduced disk requirements. Mid range machines with HDD storage, decent CPUs and 4GB+ RAM should be enough. To run a full node, download rinkeby.json and start Geth with: geth --datadir=$HOME/.rinkeby init rinkeby.json geth --networkid=4 --datadir=$HOME/.rinkeby --cache=512 --ethstats='yournode:Respect my [emailprotected] ' --bootnodes=enode://a24ac7c5484ef4ed0c5eb2d36620ba4e4aa1 Continue reading >>

How To Read An Ethereum Transaction

How To Read An Ethereum Transaction

Last updated on October 30th, 2017 at 08:01 am Although 99Bitcoins has been around for a while, it just occurred to me that weve never really covered the basics of Ethereum transactions even though weve discussed Ethereum itself. So this post is aimed at all of the Ethereum newbies out there: lets understand how to read an Ethereum transaction. The first thing youre going to need in orderto read a transaction is an Ethereum block explorer. A block explorer is a search engine that allows you to search inside the Ethereum blockchain for transactions, addresses, and other interesting information. In this case, well use EtherScan , one of the most popular Ethereum block explorers out there today. Lets take a look at a random Ether transaction via EtherScan. Now lets break down the data that are displayed: TxHash Also known as the transaction ID, TxHash is a way to look up a specific transaction on the Ethereum blockchain. Block Height The block number in which the transaction was included (for an in-depth explanation of blocks, watch this video ) Time Stamp The time the transaction entered the blockchain (i.e., the time the block was mined) From/To The sending and receiving Ethereum addresses Value How much Ether was sent and the equivalentUSD value Before we move to the rest of the terms, lets look at a short explanation of gas. Gas in Ethereum is somewhat similar to transaction fees in Bitcoin . Each operation on the Ethereum network requires a fixed amount of gas (adding two numbers costs 3 gas, calculating a hash costs 30 gas, and sending a transaction costs 21,000 gas, for example). Gas is paid in Ether, but you cant own gas. Its just calculated at a fixed gas/ether exchange rate when you send a transaction on the Ethereum blockchain. Well talk more about gas in a dif Continue reading >>

Private Blockchain Explorer

Private Blockchain Explorer

Last blocks sample 30 minutes Avg Block Time 15. For these steps, Deploying to a Private Blockchain. I've been going to blockchain. In this article Ill walk through installing EthExplorer, a block explorer for Ethereum, in Ubuntu. >Anyone can make transactions on BTC/LTC chain. This is SHAFT Blockchain explorer. BlockCypher Testnet. Rules. {{ $root. More than 27 million people use GitHub to discover, fork, and contribute to over 80 million projects. Blockchain Explorer powered by onion-monero-blockchain-explorer Neo Explorer is an easy to use tool that provides searchable information about NEO blocks, transactions, addresses, assets and more. Then in the RISE Blockchain Explorer. private blockchain explorer Blockchain Explorer (Verge) Blockchain Explorer Chain Core is enterprise-grade blockchain infrastructure that enables organizations to build better financial services from the ground up. Blockchain height : bchain. Litecoin. For these steps, I'm running my Ubuntu instance in VirtualBox on a Windows 10 host. But since I've already got the blockchain on my hard drive, this seems Jul 13, 2011 Are Bitcoin transactions really private? How Private Are Bitcoin Transactions? Block explorer tells me that someone sent 36953. This dockerized environment is designed for viewing private Quorum and Ethereum networks. com/maran/ethereum-blockchain-explorerZclassic had some issues providing a reliable block explorer in the past, so I've created one myself for Bitcoin Private: [BTCP BlockFor any developer using the Ethereum blockchain (main or testnet) is tedious: the simple synchronization is an operation of 1h at least and it will be necessary to undermine to obtain ethers. Is there any application out there that allows me to explore the Ethereum blockchain in a private network? ( Continue reading >>

Ethereum: Ethexplorer Block Explorer

Ethereum: Ethexplorer Block Explorer

Ethereum: Deploying to a Private Blockchain Make sure you have git installed, as well as nodejs and npm. Open a terminal and type the following: git clone This will create a new directory called explorer. Change into this directory: This will also install any missing dependencies. When its finished the server will start and you should see something like: > [email protected] start /home/someone/explorer> http-server ./app -a localhost -p 8000 -c-1Starting up http-server, serving ./app on port: 8000Hit CTRL-C to stop the server In your browser navigate to You may see this error: Restart geth (or start it, if you hadnt started it in the first place) with the specified rpccorsdomain value. Alternatively (and less securely), you can use a wildcard value *. geth --port 3000 --networkid 58342 --nodiscover --datadir="privchain" --maxpeers=0 --autodag \ --rpc --rpcport 8545 --rpcaddr 127.0.0.1 --rpccorsdomain "*" --rpcapi "eth,net,web3" \ --ipcapi "eth,net,web3" Refresh the browser at To see some transactions start flowing, we can attach to the geth console and start mining. Open a new terminal and type: geth attach ipc://home/someone/privchain/gath.ipc You may need to create a default account and unlock it as well. From the geth console, type: > personal.newAccount('password')> personal.unlockAccount(web3.eth.coinbase, 'password', 16000) After a few minutes the mining should start. While we wait, we can have a look at the genesis block by clicking on the *Block # link 0. Once the mining starts, refresh the block explorer in your browser to see the transactions. Taking this a step further, we could use truffle to deploy a smart contract, and see it in EthExplorer. Continue reading >>

Local Development Environment

Local Development Environment

Let's set up the local environment for smart contract application development. For local development, this tutorial uses the following environment. If you prefer other development tools, please use those as you find appropriate. In this tutorial we will assume contracts will be implemented in Browser Solidity. Execute the following command to download browser-solidity to any folder locally. (You may use this IDE directly from the Browser Solidity website, but it will not be possible to access the Deploy server.) $ git clone -b gh-pages You can start development after you opening the above file in a browser. Prepare BlockExplorer to check the state of blocks on Ethereum. As of this writing, this does not seem to work in Windows environment. Please create a virtual environment with Vagrant etc. for BlockExplorer. Follow the procedure below to launch EtherBlockExplorer. $ git clone cd ./explorer$ npm install bower$ npm start With PortForward setting configured to Deploy node, You can check the status of blocks by accessing the above link. geth -rpc -rpccorsdomain " Continue reading >>

Gastracker Review - Ethereum Classic's Ether Transaction Block Explorer?

Gastracker Review - Ethereum Classic's Ether Transaction Block Explorer?

For those who are new to crypto currencies , this would be a good time to remind them that Ethereum was not always well Ethereum. What is called Ethereum Classic(ETC) is the original Ethereum blockchain from which the current Ethereum(ETH) blockchain was forked. As a consequence of a theft in 2016, the Ethereum blockchain split into two due to ideological differences with the Ethereum Foundation. In a scenario not dissimilar to Bitcoin and Bitcoin Cash , we now have two chains each claiming to be the real' Ethereum. Ethereum is a distributed computing platform with smart contract functionality, meaning that it facilitates smart contract developers to deploy their Dapps on the platform. In 2016, a decentralized autonomous organization called The DAO , a set of complex smart contracts instantiated on the platform poised to revolutionize Ethereum had an objective to provide a new decentralized business model for organizing both commercial and non-profit enterprises. DAO, launched as a stateless crowd fund, raised a total of 11.5 million ETH from 11,000 investors in May 2016. A paper was published the same month, highlighting security vulnerabilities in DAO and recommending investors to hold off from investing DAO in projects until the vulnerabilities were secured. The week after, while developers were still working on solutions to address the vulnerabilities, an anonymous entity exploited a combination of the vulnerabilities to steal 3.6 million ETH from the fund. When dispute arose as to what recourse befit the exploitation, the community was divided into two, with one arguing that although unethical, the attack was a valid transaction based on the rule that code is law and blockchain is supposed to be immutable, while others sought for the stolen ETH to be re-appropriat Continue reading >>

Github - Carsenk/explorer: Ethereum Block Explorer (ethexplorer V2) - Realtime Price Ticker, Shapeshift.io Integration, Etc.

Github - Carsenk/explorer: Ethereum Block Explorer (ethexplorer V2) - Realtime Price Ticker, Shapeshift.io Integration, Etc.

Ethereum Block Explorer (ETHExplorer V2) - Realtime Price Ticker, Shapeshift.io Integration, etc. ETHExplorer V2 based off github.com/etherparty/explorer The code in this branch is licensed under GPLv3 (see LICENSE file) Feel free to modify or reuse the code here. Discuss this project at: Reddit Page on /r/ethreum Make sure to install geth as well for the ETH explorer to be able to function. Then run: geth --rpc --rpcaddr localhost --rpcport 8545 --rpcapi "web3,eth" --rpccorsdomain "Then visit in your browser of choice after you npm start the explorer ##Updates since original etherpaty/explorer base: -Regular Expressions completed for Addresses, Block #s, and Transacions IDs (aka Search works great) -The theme is based off Bootstrap V3 for responsive design. -You can easily change from a dark or light theme utilizing -There is a basic API implemented now as well as well as a Ethereum Blockchain Information page -Address Pages are integrated with Shapeshift to easily send a payment to an address. Continue reading >>

Announcing Our Blockchain Explorer

Announcing Our Blockchain Explorer

Its been a busy few months here at blk.io with supporting the milestone 3.x release of web3j and getting our first enterprise product built. One of the challenges weve always had when working with private Ethereum or Quorum blockchain networks is the lack of a tool like Etherscan for viewing whats been happening in the blockchain. We decided to build a blockchain explorer to address this shortcoming. Our block Explorer supports both Ethereum and Quorum networks, and provides the ability to search for and view recent blocks, transactions and deployed smart contracts. Its super responsive, event at scale weve tested in on live networks with millions of transactions across millions of blocks. Weve kept the explorer experience as simple as possible this includes integrating it with your network. All that is required to get up and running with it is details of the node you want to sync from, the Explorer takes care of the rest. Quorums transaction privacy is also well catered for. When a private transaction is encountered, the Explorer marks it as private, and will request details of the transaction on demand from the Quorum enclave, keeping your data private. A challenge when working with smart contracts is understanding what actions they are performing when you interact with them. The creation of log events on the blockchain is the recommended method of recording state changes in smart contracts. However, making sense of what actions those events represent is non-trivial. To address this, our Explorer provides a contract registry. Using this registry, you can associate information about smart contracts with the Explorer, so when you are viewing the events associated with a transaction, you can see details of the event that was called and its parameter values. For instance Continue reading >>

Ethereum Classic Community

Ethereum Classic Community

Vitalik Buterin and The Ethereum Foundation create the first blockchain-based turing-complete smart contract platform Slock.it construct TheDAO Ethereum Contract; a security audit is completed by Dejavu TheDAO smart contract is deployed; members of the public send it value in return for DAO tokens Slock.it announce a $1.5 Million USD proposal, paid in Ether by the crowdfund, 'to guarantee the integrity of The DAO' On the last day of the crowdsale, DAO curator Vlad Zamfir calls for a moratorium on TheDAO, citing many game-theoretical security issues The crowdsale completes to become the world's largest and raising an incredible $150 Million USD Peter Vessenes publicly discloses the existence of a critical security vulnerability overlooked in many Solidiy contracts Stephan Tual publicly claims that TheDAO funds are safe despite the newly-discovered critical security flaw Ether is slowly and silently drained from TheDAO as the re-entry bug is applied The price of Ether is slashed in half as Griff Green announces that TheDAO has been hacked TheDAO's splitting mechanism gives around a month for a solution to be found that recovers the funds; Foundation and community developers race to implement a soft fork A group of 'white-hat' hackers secure 70% of TheDAO funds but protocol-level action is required to save the remaining 30% split by the hacker The Ethereum Foundation releases a 'Soft Fork' client to censor transactions coming from the hacker; mining pools vote to enable it by lowering gas limit Critical Denial of Service flaws are found in the Soft Fork implementation, miners quickly decide not to use it Many days of intense arguing goes on in the Ethereum community about the pros and cons of implementing a Hard Fork The only remaining option is a controversial Hard Fork. Continue reading >>

Ethereum & Rotterdam

Ethereum & Rotterdam

With Public transportation: When you exit the Central station from the front, the 'Groot Handelsgebouw' will be located on your right side. CIC Rotterdam is located on the 4th floor of the Groot Handelsgebouw. By Car: If you are coming by car, there is a parking garage under the building navigate to Conradstraat, Rotterdam for the entrance of the parking garage. Once parked you can take the elevator from the A-part of the building to the 4th floor. BlockLab puts blockchain technology into practice. Rooted in the Port and the City of Rotterdam BlockLab develops use cases with alliances of engineers, developers, system players and end users. BlockLab's focus is on energy and logistics the first being Rotterdams biggest challenge, the latter our greatest strength. Capacity building and internationalization are supportive tracks. BlockLab is a subsidiary of the Port of Rotterdam, co-founded by the City of Rotterdam. As a Smart Industries Fieldlab BlockLab is embedded in a regional innovation ecosystem; with the Port Authority BlockLab unlocks a global network; BlockLab also participates in the Dutch Blockchain Coalition. is a subsidiary of the Port of Rotterdam, co-founded by the City of Rotterdam. Building on top of Ethereum protocols and projects like 0x, Raiden and Gnosis Flashboys has built a few proof of concepts on top of Ethereum-based protocols and projects like 0x, Raiden and Gnosis. In this presentation they will show some of these projects and share their experiences. By: Dave Hoogendoorn & Emiel van der Hoek (openAware BV) Why would you build another block explorer? What does it take to build a block explorer? In addition to answering these questions, this presentation will go into some of the technical details and challenges that were encountered during this p Continue reading >>

Bitcoin Block Explorer - Blockchain

Bitcoin Block Explorer - Blockchain

Like paper money and gold before it, bitcoin and ether allow parties to exchange value. Unlike their predecessors, they are digital and decentralized. For the first time in history, people can exchange value without intermediaries which translates to greater control of funds and lower fees. Search You may enter a block height, address, block hash, transaction hash, hash160, or ipv4 address... Continue reading >>

Build Your Own Blockchain

Build Your Own Blockchain

How to Create a Private Ethereum Blockchain from Ground-up? Ethereum is a decentralized platform that runs smart contracts, applications that run exactly as programmed without possibility of downtime, censorship, fraud or third party interference. In this blog post I will take you through all the steps required in setting up a fully functioning private ethereum blockchain, inside your local network which includes: Setting up a private blockchain with ethereum using geth. Setting up the MetaMask ethereum wallet to work with the private blockchain. Transfer funds between multiple accounts. Create, deploy and invoke a smart contract on the private blockchain using remix. Setting up ethereum block explorer over the private blockchain. Go Ethereum (or geth ) is one of the three original implementations (along with C++ and Python) of the ethereum protocol. It is written in Go, fully open source and licensed under the GNU LGPL v3. Go Ethereum is available either as a standalone client called geth that you can install on pretty much any operating system, or as a library that you can embed in your Go, Android or iOS projects. To install geth on Mac OS X, we use homebrew . Homebrew installs the stuff you need that Apple didnt. This blog assumes you have homebrew installed already, in case not check this out. Once you have homebrew installed, following commands will install geth. Installing geth on Ubuntu is straightforward, you just need to use apt-get the commands are shown below. sudo apt-get install software-properties-common For Windows, you can find the corresponding geth installation here . If you find any difficulties in any of the above installations, check this out. First we need to create an account for ethereum mining. This will generate a public/private key pair for Continue reading >>

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