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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 >>

Myetherwallet.com

Myetherwallet.com

Ledger / TREZOR / Digital Bitbox : Use your hardware wallet . Your device * is * your wallet. MetaMask Connect via your MetaMask Extension . So easy! Keys stay in MetaMask, not on a phishing site! Try it today. Jaxx / imToken Use your Mnemonic Phrase to access your account. Mist / Geth / Parity: Use your Keystore File (UTC / JSON) to access your account. **Do not lose it!** It cannot be recovered if you lose it. **Do not share it!** Your funds will be stolen if you use this file on a malicious/phishing site. **Make a backup!** Secure it like the millions of dollars it may one day be worth. **If you do not reveal your bid, you will not be refunded.** You will unlock your account, enter the Bid Amount, and the Secret Phrase. In the event that two parties bid exactly the same amount, the first bid revealed will win. Once the auction has ended (after 5 days / 120 hours), the winner needs to finalize the auction in order to claim their new name. The winner will be refunded the difference between their bid and the next-highest bid. If you are the only bidder, you will refunded all but 0.01 ETH. The auction for this registrar is a blind auction, and is described in EIP162 . Basically, no one can see *anything* during the auction. Be safe & secure: We highly recommend that you read our guide on How to Prevent Loss & Theft for some recommendations on how to be proactive about your security. Always backup your keys: MyEtherWallet.com & MyEtherWallet CX are not "web wallets". You do not create an account or give us your funds to hold onto. No data leaves your computer / your browser. We make it easy for you to create, save, and access your information and interact with the blockchain. We are not responsible for any loss: Ethereum, MyEtherWallet.com & MyEtherWallet CX, and some of 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 Download And Install Ethereum Wallet And The Blockchain ( Geth Aka Go Ethereum ) : Ethereum

How To Download And Install Ethereum Wallet And The Blockchain ( Geth Aka Go Ethereum ) : Ethereum

(How you are supposed to know how and where to grab that ordinarily, I don't know). Now Geth, or Go Ethereum, is a funny program. Do NOT open it. Do NOT run the program after install, simply install it, and let it be. (3) Skip to step 4, or if you already opened Geth, do the following: Navigate to : C:\Users\YOURNAME\AppData\Roaming\Ethereum And delete Geth, but leave Keystore (this is the Wallet - make a copy of this if you even think you may accidentally delete it). NOTE : This is how to transfer and safeguard your Ethereum Wallet. (4) So rather than Open Geth via Icon, you must access it via command line to use it properly. On Windows 10, do the following: windows + r -> type cmd -> enter -> type cd c:\pathtogeth\ OR type " CD C:\Program Files\Geth " - Enter This is the command prompt area. If you type something funny, a list of commands pops up, or " C:\Program Files\Geth>geth help ". If you type: Then that will launch Geth in Fast Mode (Download and process after), and will utilize up to 1 Ram (default is 10% of 1 Ram - Alternatively you could say 2048 or something). Doing this will download like 2 million blocks an hour on fast comp with cable internet. After a few hours, the bulk of the process should be complete, at which point you'll receive a block a minute. More explanation regarding Step 3 and default settings: If you run Geth 'as default'', then essentially it can never complete as it only allocates 10% of 1 Ram AND verifies each and every block on each download all the way through (so with Fast, you are only verifying the 'top half' of the block chain, while downloading it in total, BUT under the default setting you download and then reverify each block, then download another, then reverify each block, etc... ). Continue reading >>

Ethereum: Using The Wallet With A Private Geth Node

Ethereum: Using The Wallet With A Private Geth Node

Ethereum: Deploying to a Private Blockchain This step may be optional depending on your situation. If youve had geth running in a dev environment for a while then its worth checking if a newer version is available. Check your current geth version by opening a terminal and typing: GethVersion: 1.5.9-stableGit Commit: a07539fb88db7231d18db918ed7a6a4e32f97450Protocol Versions: [63 62]Network Id: 1Go Version: go1.7.3OS: linuxGOPATH=GOROOT=/usr/lib/go-1.7 The stable version available at time of writing is 1.6.7. StackExchange has a nice answer on updating Mist on Ubuntu which helped me with the next part: sudo apt-get install software-properties-commonsudo add-apt-repository -y ppa:ethereum/ethereumsudo apt-get update && sudo apt-get upgrade Lastly, validate that geth was updated successfully: You should see output similar to below confirming the version installed as 1.6.7-stable GethVersion: 1.6.7-stableGit Commit: ab5646c532292b51e319f290afccf6a44f874372Architecture: amd64Protocol Versions: [63 62]Network Id: 1Go Version: go1.8.1Operating System: linuxGOPATH=GOROOT=/usr/lib/go-1.8 Next youll need to download the Ethereum Wallet if its not already installed on your machine. wget Wait until the download is complete and youll see something like this: .HTTP request sent, awaiting response... 200 OKLength: 57229019 (55M) [application/octet-stream]Saving to: 'Ethereum-Wallet-linux64-0-9-0.zipEthereum-Wallet-lin 100%[===================>] 54.58M 794KB/s in 2m 12s 2017-08-18 23:12:42 (425 KB/s) - 'Ethereum-Wallet-linux64-0-9-0.zip saved [57229019/57229019] Unzip the downloaded file and cd into the newly created directory: unzip Ethereum-Wallet-linux64-0-9-0.zipcd linux-unpacked The new directory named /linux-unpacked should contain several files, including the ethereumwallet exec Continue reading >>

A Gentle Introduction To Ethereum

A Gentle Introduction To Ethereum

Ethereum builds on blockchain and cryptocurrency concepts, so if you are not familiar with these, its worth reading a gentle introduction to bitcoin and a gentle introduction to blockchain technology first. This article assumes the reader has a basic familiarity with how Bitcoin works. Ethereum is software running on a network of computers that ensures that data and small computer programs called smart contracts are replicated and processed on all the computers on the network, without a central coordinator. The vision is to create an unstoppable censorship-resistant self-sustaining decentralised world computer. The officialwebsite is Itextends the blockchain concepts from Bitcoin which validates, stores, and replicates transaction data on many computers around the world (hence the term distributed ledger). Ethereum takes this one step further, and also runs computer code equivalently on many computers around the world. What Bitcoin does for distributed data storage, Ethereum does for distributed data storage plus computations. The small computer programsbeing run are called smart contracts, and the contractsare run by participants on their machines using asort ofoperating system called a Ethereum Virtual Machine. To run Ethereum, you can download (or write yourself if you have the patience) some software called an Ethereum client. Just like BitTorrent or Bitcoin, the Ethereum client will connect over the internet to other peoples computers running similar client softwareand start downloading the Ethereum blockchain from them to catch up. It will also independently validate that each block conforms to the Ethereum rules. What does the Ethereum client software do? You can use itto: Create new transactions and smart contracts Your computer becomes a node on the network, r Continue reading >>

How To Change The Blockchain Dir? #572

How To Change The Blockchain Dir? #572

Actually in Windows there's JUNCTION and, just like Linux, you can create a link of the existing data folder to another one (even in another drive) as you see fit. You can download junction from microsoft technet here: . No installation required. So, in this case, you just need to stop geth, move the data folder to another drive/folder/path and create a junction from the original path to the new one. Move the contents of "%USERPROFILE%\AppData\Roaming\Etherium\Geth" to "G:\Data\Geth" and wait for it to finish. Then execute (on a cmd prompt): cd "%USERPROFILE%\AppData\Roaming\Etherium" If you list the contents (dir) it will show something like: 05/11/2017 20:52 Geth [??\G:\Data\geth] Continue reading >>

Ethereum Wallet Review 2017:the Official Wallet For Eth | Finder.com

Ethereum Wallet Review 2017:the Official Wallet For Eth | Finder.com

The Ethereum Wallet is free to download and use, although it will cost you some time and space on your hard drive to download the blockchain. You will most likely need to pay transaction fees in order to send ether over the network, although there is a flexibility feature built in to give you some control over fees in relation to transaction priority. Digital tokens issued on the Ethereum platform The Ethereum Wallet is found within a larger application called Mist. Mist is a web browser designed to interact with decentralized applications (DApps) running on the Ethereum network. The Ethereum Wallet is one application built into Mist, and youll need to run Mist in order to use the Wallet. Its important to note that Mist is still in beta, and its up to users to stay informed about bug fixes, software updates and other potential issues by checking in with official Ethereum channels. Ethereum is a young project, and many elements of the Ethereum platform are still under development. A lot of the existing infrastructure that enables users to interact with Ethereum is designed primarily for developers and those with a fairly advanced technical skillset. Fortunately, however, the official Ethereum Wallet does come with a simple graphical user interface (GUI) and its not too difficult to get it up and running. Heres how: Before you can add currency, you will need to download the latest version of the Ethereum Wallet. The safest and easiest way to do this is to use the link on the official website . If the download doesnt start automatically, you may be taken to Ethereums GitHub page. Scroll down until you find the appropriate download for your operating system. Once the download has completed, you can launch the Mist application. Youll be prompted to choose between using the 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 >>

Connecting To The Network

Connecting To The Network

Distribution of client implementations on the current live network - Realtime stats on EtherChain. Public, private, and consortium blockchains Most Ethereum projects today rely on Ethereum as a public blockchain, which grants access to a larger audience of users, network nodes, currency, and markets. However, there are often reasons to prefer a private blockchain or consortium blockchain (among a group of trusted participants). For example, a number of companies in verticals, like banking, are looking to Ethereum as a platform for their own private blockchains. Below is an excerpt from the blog post On Public and Private Blockchains that explains the difference between the three types of blockchains based on permissioning: Public blockchains: a public blockchain is a blockchain that anyone in the world can read, anyone in the world can send transactions to and expect to see them included if they are valid, and anyone in the world can participate in the consensus process the process for determining what blocks get added to the chain and what the current state is. As a substitute for centralized or quasi-centralized trust, public blockchains are secured by cryptoeconomics the combination of economic incentives and cryptographic verification using mechanisms such as proof of work or proof of stake, following a general principle that the degree to which someone can have an influence in the consensus process is proportional to the quantity of economic resources that they can bring to bear. These blockchains are generally considered to be fully decentralized. Consortium blockchains: a consortium blockchain is a blockchain where the consensus process is controlled by a pre-selected set of nodes; for example, one might imagine a consortium of 15 financial institutions, each of 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 >>

How Long To Download Ethereum Blockchain?

How Long To Download Ethereum Blockchain?

How long to download Ethereum Blockchain? So I downloaded the Ethereum-Wallet(MIST) because I want to get into altcoins as well as Bitcoin. When I started the Wallet, it started downloading the Ethereum Blockchain. This is more then 24h ago at it seems the closer I get to finish downloading the whole thing the slower the download I mean it's getting ridiciulous with this massive blockchain downloads and the wiaitng time, especially because I download around 15GB so far. 15GB I could download in less than an hour so why does this take so long with these blockchains I thought its like a p2p download, And o another note the number of total Blocks seem to be changing while downloading. I wouldn't have been surprised if it would grow bigger because of more transactions in the blockchain etc. but it is jumping frim 1,480,000ish to 1,580,000ish Blocks... back and forth... I'm relatively new to the cryptocoin-world so forgive me if some of these questions seem ignorant or naive. 12+ exclusive games The Bitcoin Casino by Primedice Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here. A few hours for me. But I did that a few months ago now. It takes very very long time. very bad* must wait hours*: is not future. i am in the hopes some thing comes back from the future for betterment of online cryptographic currency! () So I downloaded the Ethereum-Wallet(MIST) because I want to get into altcoins as well as Bitcoin. When I started the Wallet, it started downloading the Ethereum Blockchain. This is more then 24h ago at it seems the closer I get to finish downloading the whole thing the slower the download I mean it's getting ridiciulous with this massive blockchain downloads and the wiaitng time, Continue reading >>

How To Install Testnet For The Ethereum Blockchain Client

How To Install Testnet For The Ethereum Blockchain Client

How to install Testnet for the Ethereum blockchain client Blockchain Semantics has had a lot of people reach out and tell us they have trouble installing testnet for the Ethereum blockchain. Needless to say, this is the first step in being able to develop smart contracts on Ethereum. So, here is a set-by-step ready reckoner for getting your testnet going! Ethereum client provides an interface to create transactions, mine blocks and various other blockchain interactions. Currently three client implementations are available for Ethereum. Of these three, this article covers Geth. First lets have a look at the installation instructions for Geth. Video tutorial for setting-up Testnet for Ethereum Blockchain Geth is available for Linux, Windows and OS X. Lets see how to install it in various operating systems. To install GETH on ubuntu, open Terminal using Ctrl + Alt + T and type: sudo apt-get install software-properties-common Now hit Enter. The program will ask you to type the password. Enter your password and press Enter. You should see a result similar to the figure shown. Next type the following command at the prompt and type Enter. sudo add-apt-repository -y ppa:ethereum/ethereum When the program asks whether youd like to allow the installation to take some hard drive space, type Y(yes) and press Enter. After the installation is finished, you can check geth by typing the following at the prompt: Geth packages are built and can be downloaded from . The download page provides an installer as well as a zip file. Once the file has finished downloading, open and install geth.exe GETH installation for MAC requires GO compiler to be installed. If you dont have GO compiler, install it first using: Once the repository has cloned, change the working directory.: Using Go-Ethereum Continue reading >>

Ethereum Wallet Does Not Synch (downloading Chain Structure Without End In Sight) #2749

Ethereum Wallet Does Not Synch (downloading Chain Structure Without End In Sight) #2749

Version: `0.8.10`OS & Version: osxNode type: `Geth 1.6.6 (Go)`Number of blocks synchronized: 4010159 I'm not a techie but wanted to try and download and synch a wallet to start to learn. It's been three days and the wallet has not synched. The "downloading chain structure" never ends. What options do i have? It usually does take a few hours. But if it's taking too long, you want to check other things like - is a firewall/antivirus blocking anything, are you behind a proxy and can you try on another network, any specific issues shown in the log file? Hey Sathish - i read your earlier responses on the same lines. No firewall/antivirus, no proxy, tried two networks too. No log file issues that i can see. The issue is that it's been 3 days and the chain structure just keeps on growing, just never ends. Same here. It looks like this isn't a priority for fixing or they just can't repro it. It's going to be up to us to fix it or abandon MIst/Wallets in Ethereum. I'm on my third day of trying to download the block chain for my wallet. I'm on Windows 10. I have no firewall/proxy/network issues. Here's the last entries in the log when it's stuck (nothing unusual except the retry): INFO [08-12|12:55:12] Imported new state entries count=1 flushed=1 elapsed=0s processed=19798 pending=3054 retry=1 duplicate=0 unexpected=2 INFO [08-12|12:55:14] Imported new state entries count=384 flushed=420 elapsed=114.308ms processed=20182 pending=3124 retry=2 duplicate=0 unexpected=2 INFO [08-12|12:55:15] Imported new state entries count=384 flushed=404 elapsed=22.045ms processed=20566 pending=2876 retry=2 duplicate=0 unexpected=2 INFO [08-12|12:55:17] Imported new state entries count=384 flushed=386 elapsed=92.248ms processed=20950 pending=2919 retry=264 duplicate=0 unexpected=2 It appears to ge Continue reading >>

Ethertweet - Microblogging On The Ethereum Blockchain

Ethertweet - Microblogging On The Ethereum Blockchain

This repository contains the code of a decentralized microblogging service running on the Ethereum blockchain. The service provides basic Twitter-like functionality to tweet messages of up to 160 characters. Here, decentralization means there is no company or central authority in control of what is being published. The system is censorship resistant in the sense that once a message is published, it can only be removed by the publisher. All accounts can receive donations in Ethereum's Ether crypto currency. Being able to receive donations can be an incentive to run a decentralized microblogging feed. To not expose the user's social graph to the world, following other accounts is not supported on purpose. If you want to edit the source files, you can use Ethereum's Mix IDE which can be found here . In the repository, there is a Mix IDE project file called .mix, it also contains some test cases used during development. Mix can simulate a local blockchain for testing. geth --rpc --rpccorsdomain="With geth running, open in your web browser. You should see a menu of existing accounts and the corresponding tweets, as shown in this picture: Posting tweets is not yet supported using the web browser. Instead, you have to use the geth command line. After starting geth as shown above, open a second shell and start the interactive geth interface by running You should see various ethereum statistics like the current block number. All commands below assume you are in the interactive geth interface. An example how to read tweets of an existing account. See section Browse Accounts below, to learn how to explore all existing accounts. Create a local variable TweetAccount to point to the existing account. Here, the address of the test account 0x9e82d1745c6c9c04a 6cfcde102837cf0f25efc56 i Continue reading >>

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