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Delete Ethereum Blockchain Windows

How To Setup A Local Test Ethereum Blockchain

How To Setup A Local Test Ethereum Blockchain

Facebook Google Linkedin Twitter Telegram Setting up a private chain is useful for testing purposes or simply for playing around with, I couldnt find a good tutorial on it so I thought I would write my own. In this tutorial we are working on Ubuntu 14.04 LTS and Go Implementation of Ethereum go-ethereum or simply geth The Genesis block is the start block of the Blockchain - the first block, block 0, the only block that does not point to a predecessor block. Its the entry point into the Blockchain database. The Genesis data defines initial parameters of the database and defines a cryptographically valid entry block. You might think thats a flaw in the system being able to decide the starting conditions of the chain, but the consensus algorithm will ensure that no other node will agree with your version of the blockchain unless they have the same genesis block (and some other crucial parameters, discussed later). Great, so how do we make one of these genesis blocks? Well its fairly simple the following JSON is all you really need: { "nonce": "0x0000000000000042", "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000", "difficulty": "0x4000", "alloc": {}, "coinbase": "0x0000000000000000000000000000000000000000", "timestamp": "0x00", "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000", "extraData": "Custem Ethereum Genesis Block", "gasLimit": "0xffffffff"} Save the JSON into a file lets call it genesis.json and save in your home directory. $ geth --genesis --datadir --networkid 123 --nodiscover --maxpeers 0 console It utilises the genesis block json to seed the blockchain It uses the datadir to store all state necessary to maintain the newly created blockchain an Continue reading >>

Change Gaslimit Parameter Into The Genesis.json File On Azure Priavte Blockchain

Change Gaslimit Parameter Into The Genesis.json File On Azure Priavte Blockchain

change gasLimit parameter into the genesis.json file on azure priavte blockchain Azure Blockchain Question 2 7/20/2017 12:33:11 PM 9/1/2017 7:16:02 AM Forum to provide support for Blockchain related Azure marketplace solutions published by Microsoft:1. Azure Blockchain Service2. Azure Mult-member Blockchain(see our announcement for links to these solutions) 0 1 I am trying to deploy a smart contract to an azure ethereum blockchain. The contract is deployed without errors but i cant submit transactions to the blockchain trough this contract. This is an issue with gasLimit parameter on the genesis.json file , because the functions on the contract are a bit complex. It perfectly worked with testRPC and with a blockchain that I created locally using geth and where I could set my parameters. The gasLimit on auzre is set up by microsoft on the genesis.json file and I would like to find a way to change it. Moved by BharathNalla Microsoft contingent staff, Administrator Tuesday, July 25, 2017 6:59 PM request To modify the gas limit, please perform the following steps on each node: Issue killall geth command to stop geth processes. Modify genesis.json file to your new gas limit value. Modify start-private-blockchain.sh at line 45 to include --targetgaslimit yournewgaslimitvalue as an input to MINE_OPTIONS Run the start-private-blockchain.sh script using the parameters specified in /etc/rc.local Please respond if you have any further questions. Continue reading >>

How To Synchronize Parity With Ethereums Mainnet In 20 Minutes

How To Synchronize Parity With Ethereums Mainnet In 20 Minutes

Synchronizing with Ethereums MainNet can take an extremely long time. Even many days And it doesnt matter what software you use to synchronize. The results are the same very very slow. Since this was driving me crazy, I decided to study the command line instructions for Parity. . Its exactly as it sounds. Its very fast but when used incorrectly, you will corrupt your blockchain database, therefore lose everything you have downloaded so far. And then you can start all over Here is the explanation on Paritys configuration page on Github: --fast-and-loose disables DB WAL, which gives a significant speed up but means an unclean exit is unrecoverable. (default: false) --fast-and-loose disables DB WAL, which gives a significant speed up but means an unclean exit is unrecoverable. (default: false) To save you some headache and a lot of wasted time, I highly recommend removing all your existing blockchain data before using the ‐-fast-and-loose switch. The easiest way to remove the complete blockchain data is to launch Command Prompt and use the following command: Now you can go to your Start Menu, find the Parity Ethereum softwares shortcut and Add ‐-fast-and-loose switch to Parity You will end up with the following command line in the Target box: "C:\Program Files\Parity\Parity\ptray.exe" --fast-and-loose ui "C:\Program Files\Parity\Parity\ptray.exe" --fast-and-loose ui Using this method, the full synchronization with Ethereums MainNet will take about 20 minutes. Its even faster than that if you are using an SSD drive. When done, make sure to exit Parity correctly, in order not to corrupt your blockchain database. on Paritys icon in the Taskbar and select Before you start up Parity the next time, I recommend removing the ‐-fast-and-loose switch we have added us Continue reading >>

How To Delete Your Local Copy Of The Blockchain

How To Delete Your Local Copy Of The Blockchain

How to Delete Your Local Copy of the Blockchain If you want to delete your local copy of the NEM blockchain, it is strongly recommended to shutdown the NEM software (NCC and NIS) first. The blockchain is a database file located at: Windows Vista/7/8: C:\Users\[YOUR-USERNAME]\nem\nis\data\ Mac: /Users/[YOUR-USERNAME]/nem/nis/data/ Linux: /home/[YOUR-USERNAME]/nem/nis/data/ After you deleted the blockchain, restart the NEM client and it will begin to download and synchronize the blockchain from scratch. If you don't want to wait for the blockchain to download, you can follow this guide to import the developer uploaded database. 1. Open the Windows file explorer and go to (C:) and then to Users. 6. Delete the "nis5.h2" file (this is the blockchain database): 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 >>

Ethereum Wallet Syncing Problems

Ethereum Wallet Syncing Problems

One of the most common problems with the Ethereum Wallet application is keeping the blockchain in sync with the Ethereum network. This page describes some of the common issues users may encounter while trying to sync the blockchain and potential methods to work around the problems. Note that Ethereum Wallet will not display your account balance correctly when it is not synced fully or correctly. Check that your the clock on your computer is close to real time. Change your system settings so that your system clock is synced to an NTP (Network Time Protocol) server. Slow Syncing Between Blocks 2,283,397 And 2,717,576[ edit ] You may be encountering some problems syncing Ethereum Wallet (or Mist) to the Mainnet blockchain. A common problem when syncing Ethereum Wallet's blockchain data is that the syncing slows down between blocks 2,283,397 and 2,620,384 due to the attack on the Ethereum network (reference Why is my node synchronization stuck/extremely slow at block 2,306,843? ). The syncing also slows down between blocks 2,675,055 and 2,717,576 due to the state clearing process to remove the 20 million empty accounts created by the network attack. How to recover from slow syncing?[ edit ] If you have a problem with slow syncing, the easiest way to recover from this slowdown is to remove your blockchain data and restart Ethereum Wallet. Ethereum Wallet will then perform a fast sync which skips over these attack blocks. WARNING: Make sure you back up your keystore directory so you don't accidentally delete your account information. Depending on your operating system, you will find the chaindata subdirectory in: Linux - $HOME/.ethereum/geth OS/X - $HOME/Library/Ethereum or $HOME/Library/Ethereum/geth Windows - %APPDA Continue reading >>

Account Management Ethereum Homestead 0.1 Documentation

Account Management Ethereum Homestead 0.1 Documentation

Remember to use a strong and randomly generated password. We just created our first account. If we try to list our accounts again we can see our new account: > eth.accounts["0xb2f69ddf70297958e582a0cc98bce43294f1007d"] For the command line averse, there is now a GUI-based option for creating accounts: The official Mist Ethereum wallet. The Mist Ethereum wallet, and its parent Mist project, are being developed under the auspices of the Ethereum Foundation, hence the official status. Versions of the wallet app are available for Linux, Mac OS X, and Windows. The Mist wallet is beta software. Please beware and use it at your own risk. Creating an account using the GUI Mist Ethereum wallet couldnt be easier. In fact, your first account is created during the installation of the app. Download the latest version of the wallet app for your operating system. Opening the Wallet App will kick off syncing a full copy of the Ethereum blockchain on your computer, since you will in effect be running a full geth node. Unzip the downloaded folder and run the Ethereum-Wallet executable file. Wait for the blockchain to fully sync, then follow the instructions on the screen and your first account will be created. When you launch the Mist Ethereum wallet for the first time, you will see the account you created during the installation process. By default it will be named MAIN ACCOUNT (ETHERBASE). Creating additional accounts is easy; just click on ADD ACCOUNT in the apps main screen and enter the required password. The Mist wallet is still in active development, so details of the steps outlined above may change with upgrades. Creating a Multi-Signature Wallet in Mist The Mist Ethereum wallet has an option to secure your wallet balance with a multisig wallet. The advantage of using a multisig Continue reading >>

From What Is Blockchain? To Building A Blockchain In Less Than Anhour

From What Is Blockchain? To Building A Blockchain In Less Than Anhour

Investor, writer, and emerging tech enthusiast | www.lstephanian.com From What is Blockchain? to building a blockchain in less than anhour A blockchain is a digital ledger of records thats arranged in chunks of data called blocks. These blocks then link with one another through a cryptographic validation known as a hashing function . Linked together, these blocks form an unbroken chain a blockchain. The reason that this type of data structure is useful for things like cryptocurrencies is decentralization, meaning the records inside this chain arent stored in any single location, are accessible by everyone, and are immutable by any one party. Centralized Structure Vs. Decentralized Structure, Source: SoftwareAdvice Although blockchain is most commonly associated with Bitcoin, there are many uses for this technology. There are several broad categories of blockchain applications, a couple of which include: The Blockchain that makes up Bitcoin sends money globally to individuals and merchants. But Blockchains can also create digital assets like stocks and bonds. A Blockchain can create a verifiable record of any data, file, or contract. This can be useful in any industry that uses big data, like the medical industry or government. Before you begin, I should note that this article assumes you have a basic understanding of programming and some understanding of computer science theory. This article isnt meant to be all-encompassing, but rather to serve as an introduction to blockchain programming for those looking to expand their technical knowledge. I believe that the best way to truly understand a concept is to put it into practice. If you are interested in learning how to implement a blockchain contract, Ive put together an easy-to-follow, step-by-step tutorial below. You Continue reading >>

Ethereum Wallet Syncing Problems

Ethereum Wallet Syncing Problems

One of the most common problems with the Ethereum Wallet application is keeping the blockchain in sync with the Ethereum network. This page describes some of the common issues users may encounter while trying to sync the blockchain and potential methods to work around the problems. Note that Ethereum Wallet will not display your account balance correctly when it is not synced fully or correctly. Check that your the clock on your computer is close to real time. Change your system settings so that your system clock is synced to an NTP (Network Time Protocol) server. Slow Syncing Between Blocks 2,283,397 And 2,717,576 You may be encountering some problems syncing Ethereum Wallet (or Mist) to the Mainnet blockchain. A common problem when syncing Ethereum Wallet's blockchain data is that the syncing slows down between blocks 2,283,397 and 2,620,384 due to the attack on the Ethereum network (reference Why is my node synchronization stuck/extremely slow at block 2,306,843? ). The syncing also slows down between blocks 2,675,055 and 2,717,576 due to the state clearing process to remove the 20 million empty accounts created by the network attack. If you have a problem with slow syncing, the easiest way to recover from this slowdown is to remove your blockchain data and restart Ethereum Wallet. Ethereum Wallet will then perform a fast sync which skips over these attack blocks. WARNING: Make sure you back up your keystore directory so you don't accidentally delete your account information. Depending on your operating system, you will find the chaindata subdirectory in: Alternatively, you can run geth removedb to remove the blockchain data. Start Ethereum Wallet. It should now start fast syncing the blockchain data. Alternatively, run geth --syncmode "fast" --cache 1024 console an Continue reading >>

Parity

Parity

Parity comes with an extensive, easy-to-use, in-built Ethereum Wallet and app environment that can be accessed via your Web browser of choice. Account, address book and multi-sig management Hardware and electronic cold wallet support Develop smart contracts and decentralised applications with Parity or build protocol extensions. Check out our Wiki , Gitter and Bug Bounty Program Parity is designed for mission critical use in enterprise environments. Parity has a number of features that make it perfect for deployment in private or consortium setting. The Parity Ethereum client is built from the ground up to the highest standards of software development. Tuned, hand optimised use of low-level Rust language JITEVM turbocharges execution of complex contracts Multi-level in-memory caching Memory and concurrency safety guaranteed by Rust language Actor-based modularity ensures maximal resilience Unit tested and peer reviewed from day one Standard, JSON-based, chain-specification format EVM plugins allow native speed contracts Actor-based modular architecture with IPC Rust's ownership tracking facilitates minimal memory footprint Cache management gives fine control to user State-trie pruning minimises storage footprint 1-line install on Mac and Linux Docker images available Library APIs are fully documented 100% consensus test conformant implementation Complies with standard devp2p network protocol Fully compatible with JSON-RPC API Stable is the most mature and tested software Beta comes with additional features and better performance but may yet have quirks and issues to be fixed Nightly is a cutting edge software build but comes with a strong caveat against using it for managing anything of value From RLP and the Trie to the network subsystem. We aim for our unit tests to Continue reading >>

Heres How I Built A Private Blockchain Network, And You Cantoo

Heres How I Built A Private Blockchain Network, And You Cantoo

Heres how I built a private blockchain network, and you cantoo Nothing helps understand blockchains better than building oneyourself This is PART-4 of The Product Managers guide to the Blockchain series! If you somehow landed on my publication for the first time, Welcome! I recommend you start from part 1 , and then read part 2 and part3 before reading this post. However If you are the explorer type, read on! (Update: Heres the latest part 5 of the blockchain series ) In Part 3 of this series, we looked at the mechanics of Ethereum and also talked about the concept of Ethereum Accounts, Smart Contracts and Gas the fuel that helps all these pieces to work together. Its been a lot of reading so far, but while you can read all the blockchain content available on the internet, nothing helps understand blockchains better than building one yourself. So thats what I did. You can simply follow this post and build a little prototype to see how everything weve talked about so far comes together. Here is what we will accomplish in this post, Weve seen this before , but basically the Ethereum blockchain network is simply lots of EVM (Ethereum Virtual Machines) or nodes connected to every other node to create a mesh. Each node runs a copy of the entire blockchain and competes to mine the next block or validate a transaction. Whenever a new block is added, the blockchain updates and is propagated to the entire network, such that each node is in sync. To become a node in the Ethereum network, your computer will have to download and update a copy of the entire Ethereum blockchain. To achieve this Ethereum provides tools that you can download, connect to the Ethereum network with and then interact with it. These are: Geth if you have experience with web development and are interested i Continue reading >>

How To Delete Geth Chaindata & Resync

How To Delete Geth Chaindata & Resync

Home Guides Clients How To Delete Geth Chaindata & Resync Go-Ethereum (Geth)is one of the many Ethereum clients . It is developed by developers from the Ethereum Foundation . The core features of Ethereum web 3.0 stack are expected to arrive at Geth first. In this guide, the procedure for re-syncing Gethon Windows will be shown. I am usingGeth 1.5.4 (latest stable version as of 30 Nov) on my Windows 10 machine. Note: If you have not installed Geth, please install Geth using the instructions here: How To Install Geth In Windows . Resync of the blockchain has the benefit of reducing the amount of disk space used by Geth. The deletion of chaindata folder and resyncing of the blockchain will not be needed once Geth has employed state-tree pruning which will automatically archive old blocks to reduce disk usage. Until Geth has included this functionality, the regular deletion of chaindata folder and resyncing of blockchain is recommended to keep the disk usage at minimum. The chaindata folder is located atC:\Users\\AppData\Roaming\Ethereum\geth\. Yes, delete the whole folder. Do not worry. Your Ethereum account will NOT be deleted (they are stored in another location). Step 3: Run Geth with the -fast -cache=1024 flags If you do not know how to set the flags, please usethe instructions here (Under Step 4): How To Install Geth In Windows . Step 4: Wait for Geth to complete the fast sync Fast sync is completed when Geth starts to import 1 block at a time. Continue reading >>

Ethereum Blockchain As A Service Now On Azure

Ethereum Blockchain As A Service Now On Azure

Ethereum Blockchain as a Service now on Azure Marley Gray Principal Program Manager, Azure Blockchain Engineering Microsoft and ConsenSys are partnering to offer Ethereum Blockchain as a Service (EBaaS) on Microsoft Azure so Enterprise clients and developers can have a single click cloud based blockchain developer environment. The initial offering contains two tools that allow for rapid development of SmartContract based applications: Ether.Camp - An integrated developer environment, and BlockApps - a private, semi-private Ethereum blockchain environment, can deploy into the public Ethereum environment. The Enterprise Partner Group at Microsoft is on the front lines with some of our largest customers. Everyone, particularly Financial Services, is interested in Blockchain technology. While a platform like Bitcoin has many great uses specifically as a Cryptocurrency, Ethereum provides the flexibility and extensibility many of our customers were looking for. With the Frontier Release last summer, Ethereum is real and has a vibrant community of developers, enthusiasts and businesses participating. In Financial Services particularly, Blockchain is a major disruptor to some of their core businesses, and FinTech companies are driving innovation in this space. Ethereum is open, flexible can be customized to meet our customers needs allowing them to innovate and provide new services and distributed applications or apps. Ethereum enables SmartContracts and Distributed Applications (Apps) to be built, potentially cutting out the middleman in many industry scenarios streamlining processes like settlement. But that is just scratching the surface of what can be done when you mix the cryptographic security and reliability of the Blockchain with a Turing complete programming language Continue reading >>

Synchronize Ethereum Using Geth Fast

Synchronize Ethereum Using Geth Fast

Home Notes Synchronize Ethereum using geth fast Ill show you a trick that at least seem it worked for me of how to synchronize the Ethereum Wallet faster and is to execute a geth command, Ill do this using the UI wallet in Linux Mint and how to do it in windows as well. Before we start lets take a look to some information so you understand the process better: Argument fast:This flag enables fast syncing through state downloads rather than downloading the full block data. This will also reduce the size of your blockchain dramatically. This can only be run if you are syncing your blockchain from scratch. Argument cache:Megabytes of memory allocated to internal caching (min 16MB / database forced). Default is 16MB, so increasing this to 256, 512, 1024 (1GB), or 2048 (2GB) depending on how much RAM your computer has should make a difference. I recommend to use 1024. If you already start to sync without using fast Ill show you how to start from scratch without doing any major change to the wallet (i.e. delete your wallet). You dont need to install or get geth, if you already installed the wallet it uses geth in back-end you just need to know where it is located and Ill show you later. You must have mist or eth-wallet installed and ran it at least once (doesnt matter if never was fully sync). 1.- Open the home folder then you must have shown the hidden folders, if you dont know how to show the hidden folder take a look in here Show hidden folders in Linux Mint Then we are going to work with these two hidden folders: .ethereum: this folder contains data related to the wallet we installed, here is where the blockchain data is located and we are going to clean them all, yes we are going to delete and burn it all. .config: this is a common folder among other application and also Continue reading >>

Ethereum/welcome - Gitter

Ethereum/welcome - Gitter

hi can anyone direct me to a good tutorial of a msi rx 570 bios mod Hi, I have started a single node with mining property enabled on private network and it started generating ethers, even there is not other node. Miner generate ethers only when it receives blocks from other nodes. how a single node in private network can generate ethers? I need help! I transferred funds from liqui.io to my Ethereum Wallet which in connected to the network but my ethereum I transferred won't show in my wallet because I cannot create a wallet because of a NODE error. What to do? I am using the Ethereum GUI after I downloaded the necessary scripts from git. How long does it usually take to create a contract? Haha I made this mistake when I first downloaded ethereum wallet @JosephIanF_twitter . First question, windows or mac? and also, at the top of ethereum wallet GUI, how many blocks does it say you have left to download? so good news is your coin has almost certainly been sent to your account already, and is very safe there. If you want to confirm, look up the address you sent it to on bad news is that youll have to download the whole blockchain before you can access those funds from within Ethereum Wallet. If youre getting a node error, youll need to delete the ~/Library/Ethereum/geth/chaindata folder (on a Mac) and start downloading the chain from scratch. That has your encrypted private key and if you delete that youll never be able to access the funds in that account. ok then what is use case of (--light) light client mode? geth --fast vs. geth --light geth --fast will find the best peer possible at the moment its run, and fast sync by downloading only the block headers & transaction receipts up to that peers furthest synced block. Depending on the best available peer at that time, Continue reading >>

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