CryptoCoinsInfoClub.com

Github Ethereum Go Ethereum

Github - Ethereum/go-ethereum: Official Go Implementation Of The Ethereum Protocol

Github - Ethereum/go-ethereum: Official Go Implementation Of The Ethereum Protocol

Note: This works only with geth v1.6.0 and above. One of the quickest ways to get Ethereum up and running on your machine is by using Docker: docker run -d --name ethereum-node -v /Users/alice/ethereum:/root \ -p 8545:8545 -p 30303:30303 \ ethereum/client-go --fast --cache=512 This will start geth in fast sync mode with a DB memory allowance of 512MB just as the above command does. It will also create a persistent volume in your home directory for saving your blockchain as well as map the default ports. There is also an alpine tag available for a slim version of the image. Do not forget --rpcaddr 0.0.0.0, if you want to access RPC from other containers and/or hosts. By default, geth binds to the local interface and RPC endpoints is not accessible from the outside. As a developer, sooner rather than later you'll want to start interacting with Geth and the Ethereumnetwork via your own programs and not manually through the console. To aid this, Geth has built insupport for a JSON-RPC based APIs ( standard APIs and Geth specific APIs ). These can beexposed via HTTP, WebSockets and IPC (unix sockets on unix based platforms, and named pipes on Windows). The IPC interface is enabled by default and exposes all the APIs supported by Geth, whereas the HTTPand WS interfaces need to manually be enabled and only expose a subset of APIs due to security reasons.These can be turned on/off and configured as you'd expect. --rpcaddr HTTP-RPC server listening interface (default: "localhost") --rpcport HTTP-RPC server listening port (default: 8545) --rpcapi API's offered over the HTTP-RPC interface (default: "eth,net,web3") --rpccorsdomain Comma separated list of domains from which to accept cross origin requests (browser enforced) --wsaddr WS-RPC server listening interface (default: "loca Continue reading >>

Github.com-ethereum-go-ethereum_-_2017-06-05_16-04-54

Github.com-ethereum-go-ethereum_-_2017-06-05_16-04-54

The go-ethereum project comes with several wrappers/executables found in the cmd directory. | Command | Description ||:----------:|-------------|| geth | Our main Ethereum CLI client. It is the entry point into the Ethereum network (main-, test- or private net), capable of running as a full node (default) archive node (retaining all historical state) or a light node (retrieving data live). It can be used by other processes as a gateway into the Ethereum network via JSON RPC endpoints exposed on top of HTTP, WebSocket and/or IPC transports. geth --help and the CLI Wiki page for command line options || abigen | Source code generator to convert Ethereum contract definitions into easy to use, compile-time type-safe Go packages. It operates on plain Ethereum contract ABIs with expanded functionality if the contract bytecode is also available. However it also accepts Solidity source files, making development much more streamlined. Please see our Native DApps wiki page for details. || bootnode | Stripped down version of our Ethereum client implementation that only takes part in the network node discovery protocol, but does not run any of the higher level application protocols. It can be used as a lightweight bootstrap node to aid in finding peers in private networks. || disasm | Bytecode disassembler to convert EVM (Ethereum Virtual Machine) bytecode into more user friendly assembly-like opcodes (e.g. echo "6001" | disasm). For details on the individual opcodes, please see pages 22-30 of the Ethereum Yellow Paper . || evm | Developer utility version of the EVM (Ethereum Virtual Machine) that is capable of running bytecode snippets within a configurable environment and execution mode. Its purpose is to allow insolated, fine-grained debugging of EVM opcodes (e.g. evm --code 60f Continue reading >>

Interacting With Ethereum Smart Contracts Using Go

Interacting With Ethereum Smart Contracts Using Go

Interacting with Ethereum Smart Contracts using Go Despite recent troubles , Ethereum remains the biggest player regarding Smart Contracts within the Blockchain space and this doesnt seem likely to change anytime soon. In my opinion, the technology itself has great potential and is very interesting from an academic perspective, but as the above mentioned issue and many before that show is that blockchain technology, smart contracts and especially the Ethereum ecosystem with Solidity are very immature and just not ready for prime-time / production use cases. However, its a great time to learn and get to know this technology and play around a bit to be prepared when it reaches an acceptable level of maturity for serious applications. In my previous post on Solidity, I created a small application with a simple Winner-Takes-All Crowdfunding contract. In this post, we will take the contract.sol from my previous post and see if we can deploy and interact with it using Go. Why Go? Well for one, Go is amazing ;) and the most widely used Ethereum client is written in Go, which means there is a nice ecosystem for interacting with Ethereum and smart contracts using Go with nice features such as code-generation and reusable helpers from shared libraries. In this example, we wont use the real Blockchain as a deployment target, but rather use the SimulatedBackend provided by go-ethereum so we can safely test and experiment without spending any money. The Smart Contract itself is pretty simple - I wont go into much detail on what it does or how it works, as that has been covered already . Suffice to say, that the contract is deployed with 3 parameters: Then, during the first phase, projects can be submitted using a name and a url with a transaction including at least the Minimum Entr Continue reading >>

Installation Instructions For Windows

Installation Instructions For Windows

Compiling geth with tools from chocolatey The Chocolatey package manager provides an easy way to getthe required build tools installed. If you don't have chocolatey yet,follow the instructions on to install it first. Then open an Administrator command prompt and install the build toolswe need: C:\Windows\system32> choco install gitC:\Windows\system32> choco install golangC:\Windows\system32> choco install mingw Installing these packages will set up the Path environment variable.Open a new command prompt to get the new Path. The following steps don'tneed Administrator privileges. Please ensure that the installed Go version is 1.7 (or any later version). First we'll create and set up a Go workspace directory layout,then clone the source. OBS If, during the commands below, you get the following message: WARNING: The data being saved is truncated to 1024 characters. Then that means that the setx command will fail, and proceeding will truncate the Path/GOPATH. If this happens, it's better to abort, and try to make some more room in Path before trying again. C:\Users\xxx> set "GOPATH=%USERPROFILE%"C:\Users\xxx> set "Path=%USERPROFILE%\bin;%Path%"C:\Users\xxx> setx GOPATH "%GOPATH%"C:\Users\xxx> setx Path "%Path%"C:\Users\xxx> mkdir src\github.com\ethereumC:\Users\xxx> git clone src\github.com\ethereum\go-ethereumC:\Users\xxx> cd src\github.com\ethereum\go-ethereumC:\Users\xxx> go get -u -v golang.org/x/net/context C:\Users\xxx\src\github.com\ethereum\go-ethereum> go install -v ./cmd/... Continue reading >>

Ethereum Client Platforms: Parity Versus Go-ethereum

Ethereum Client Platforms: Parity Versus Go-ethereum

Ethereum Client Platforms: Parity versus Go-Ethereum Senior Associate, Total Portfolio Management at CPP Investment Board The next step in the Ethereum world, after mastering the basics of the Solidity language and the smart contract development, is about developing simple production applications. The key ingredient here is client software. In this article, I reviewparity, the newer client software layer, and compare it togeth,the product of the Homestead project. What does the client software do? It downloads the whole blockchain onto your system on a regular basis, keeping the tab on the whole network. It verifies all transactions and contracts on the blockchain. If you are building your own contracts, it broadcasts them to the network so that they are included in the next block and confirmed by the miners. Client software can also do the mining but these days you may need a super-computer do make any ether this way. Why is this important? In order to successfully integrate blockchain transactions into a real-world application, a reliable client layer is needed. Just using or another chain scanner for the back-end would be to defeat the purpose of blockchain, a verified decentralized transaction ledger. Differently coded, independently running clients only can provide the robustness, or "antifragility" (@nntaleb) of the blockchain. With both clients, I recommend downloading the source and compiling the code. The code changes so often than any binaries are already old when you get to them. The situation is complicated by multiple spam attacks on the Ethereum blockchain, including "from Shanghai with love" and , . There is no such thing as stable geth or parity clients so the latest commit is the best call. Both geth and parity require 2-4GB of RAM and 50-100GB of hard Continue reading >>

Ethereum - Godoc

Ethereum - Godoc

Package ethereum defines interfaces for interacting with Ethereum. var NotFound = errors . New ("not found") NotFound is returned by API methods if the requested item does not exist. type CallMsg struct { From common . Address // the sender of the 'transaction' To * common . Address // the destination contract (nil for contract creation) Gas uint64 // if 0, the call executes with near-infinite gas GasPrice * big . Int // wei <-> gas exchange ratio Value * big . Int // amount of wei sent along with the call Data [] byte // input data, usually an ABI-encoded contract method invocation} CallMsg contains parameters for contract calls. type ChainReader interface { BlockByHash(ctx context . Context , hash common . Hash ) (* types . Block , error ) BlockByNumber(ctx context . Context , number * big . Int ) (* types . Block , error ) HeaderByHash(ctx context . Context , hash common . Hash ) (* types . Header , error ) HeaderByNumber(ctx context . Context , number * big . Int ) (* types . Header , error ) TransactionCount(ctx context . Context , blockHash common . Hash ) ( uint , error ) TransactionInBlock(ctx context . Context , blockHash common . Hash , index uint ) (* types . Transaction , error ) // This method subscribes to notifications about changes of the head block of // the canonical chain. SubscribeNewHead(ctx context . Context , ch chan<- * types . Header ) ( Subscription , error )} ChainReader provides access to the blockchain. The methods in this interface access rawdata from either the canonical chain (when requesting by block number) or anyblockchain fork that was previously downloaded and processed by the node. The blocknumber argument can be nil to select the latest canonical block. Reading block headersshould be preferred over full blocks whenever possible. T Continue reading >>

Could Not Connect To The Ethereum Client.

Could Not Connect To The Ethereum Client.

Could not connect to the ethereum client. I deployed a private Ethereum network on Azure. Here are some network details:ADMIN-SITE: ETHEREUM-RPC-ENDPOINT:Im having an issue with deploying a smart contract through Truffle. When I SSH into the first TX node, I am able to attach to geth by running: geth attach I get my personal accounts listed and Im able to successfully unlock it, see below: instance: Geth/smartcewj-tx0/v1.6.7-stable-ab5646c5/linux-amd64/go1.8.3 at block: 34596 (Tue, 24 Oct 2017 17:33:05 UTC) modules: admin:1.0 eth:1.0 net:1.0 personal:1.0 rpc:1.0 web3:1.0 Now, once my account is unlocked, Im attempting to deploy my smart contractthrough truffle.Here is my truffle.js file: network_id: "72" // Match any network id After I try to deploy a smart contract and runtruffle migrate -network demo I get the following error: Could not connect to your Ethereum client. Please check that your Ethereum client: - is accepting RPC connections (i.e., "--rpc" option is used in geth) - is properly configured in your Truffle configuration file (truffle.js) I know that geth is running since I could attach to it and unlock one of the eth accounts. What am I missing? We provide limited support for 3rd party tools integrating with our templates. We have verified your network is working correctly by adding a custom RPC endpoint to Metamask in a Chrome browser and sending 1000 Ether to an Ethereum address using your Blockchain Admin endpoint. In your truffle.js file, you pass the network_id in as a "" string. In the few truffle.js files we have seen, the network_id is passed in as an integer. Have you tried removing the double quotes? Also, consider the following post regarding your error with Truffle: Continue reading >>

Ethereum Smart Contracts In A Nutshell Forhackers

Ethereum Smart Contracts In A Nutshell Forhackers

Ethereum smart contracts in a nutshell forhackers Learn how to program Ethereum smart contracts using soliditylanguage This article will guide you through the steps of setting up your own Ethereum development environment and basic smart contract life cycle on Ethereum network. As the article title states, this will be done in a nutshell and to support the process, Debian GNU/Linux version 9 (stretch) and CLI interface will be used. All examples will be performed against Ethereum testnet. Installing requirements (golang, cmake, geth, solc) Working lottery example and live demo on testnet Installing requirements (golang, cmake, geth,solc) Before start, make sure to have all software and dependencies installed, the list bellow will be used in this guide. Compile the latest version of each software listed, the recommended location is under /usr/src. Golang is pre compiled. Some of the commands used during installation need to be performed as super user, you can use sudo in front of them. tar -C /usr/local -zxf go1.8.linux-amd64.tar.gz echo "export GOPATH=$HOME/go" >> ~/.bashrc echo "export PATH=$PATH:$HOME/go/bin:/usr/local/go/bin" >> ~/.bashrc discover golang latest version for linux amd64 curl -s -o - | egrep -o "[^>]*linux-amd64.tar.gz[^<]*" | sort -r | head -1 # so the compiled version is valid on etherescan # install_deps did not work for Debian9 but line bellow did apt-get -y install build-essential g++ gcc libboost-all-dev unzip # build script was unable to download jsoncpp-1.7.7 curl -L -o deps/downloads/jsoncpp-1.7.7.tar.gz Geth or Go Ethereum is the official implementation of the Ethereum protocol, it is writen in go and provides a powerful javascript console. Using the console, you can interact with the Ethereum network, by for example checking account balance o Continue reading >>

First Steps With Go Ethereum Kin Foundation Medium

First Steps With Go Ethereum Kin Foundation Medium

As part of our new journey at Kik, we started working on the Kin wallet SDK for mobile. This is a great opportunity to take a deeper step into the world of cryptocurrency. We had to research and decide if the wallet SDK should be native Android and iOS or Javascript, and whether it should be deployed via binary or WebView . The options were: go-ethereum Go library supported by Ethereum web3.js Javascript library supported by Ethereum web3.j Lightweight Java and Android library We explored and created a simple integration with those options. I explored go-ethereum right away, reading their docs and taking a few online courses, but I wanted to do more. I had to build something with go-ethereum myself in order to better understand how everything works. The integration with Geth (go-ethereum) is pretty simple. I started running a Geth node on my Mac and synced the block history on Mainnet. It took a while to sync, but eventually I had a fully running Geth on my Mac. My next goal was to set up an Ethereum node on a mobile device. It took hours, but it was just a POC so I thought, Why bother having a full node on my mobile device? I consulted with some of our blockchain specialists and asked if we had to have a full or light node on the mobile device. They told me it is not a requirement at the moment and suggested to use Infura as a node provider. The experience was smooth, and I had a connection to Testnet quickly. I created an account and started sending tokens to the world;) You can send to yourself test tokens here on Ropsten. Enjoy! With go-ethereum, I created a simple app that allows users to create as many accounts as they wish with a public address and then added a feature that checks the balance. Then, I played with the ability to send transactions passing ETH from Continue reading >>

Go Ethereum Downloads

Go Ethereum Downloads

446D 939E 45C0 DC1E 2A8E 2F62 5219 CDE2 99E2 3788 You can import the build server public keys by grabbing the individual keys directly from the keyserver network: gpg --recv-keys F9585DE6 C2FF8BBF 9BA28146 7B9E2481 D2A67EAC Similarly you can import all the developer public keys by grabbing them directly from the keyserver network: gpg --recv-keys E058A81C 85BE4B0C 05A5DDF0 2F295D12 1CCB7DD2 99E23788 From the download listings above you should see a link both to the downloadable archives as well as detached signature files. To verify the authenticity of any downloaded data, grab both files and then run: gpg --verify geth-linux-amd64-1.5.0-d0c820ac.tar.gz.asc Note that you must use the name of the signature file, and you should use the one that's appropriate to the download you're verifying. Continue reading >>

Choosing An Ethereum Client | Truffle Suite

Choosing An Ethereum Client | Truffle Suite

There are many Ethereum clients to choose from. We recommend different clients depending on whether you are developing or deploying. We recommend Ganache , a personal blockchain for Ethereum development that runs on your desktop. Part of the Truffle Suite, Ganache simplifies dapp development by placing your contracts and transactions front and center. Using Ganache you can quickly see how your application affects the blockchain, and introspect details like your accounts, balances, contract creations and gas costs. You can also fine tune Ganache's advanced mining controls to better suit your needs. Ganache is available for Windows, Mac and Linux, and you can download it here . Ganache, when launched runs on It will display the first 10 accounts and the mnemonic used to create those accounts. ( Read more about account mnemonics .) By default, Ganache will use the following mnemonic: candy maple cake sugar pudding cream honey rich smooth crumble sweet treat This mnemonic can be changed to be randomly generated, or you can input your own. Warning: Do not use this mnemonic on the main Ethereum network (mainnet). If you send ether to any account generated from this mnemonic, you will lose it all! We also recommend using Truffle Develop, a development blockchain built directly into Truffle. Truffle Develop helps you set up an integrated blockchain environment with a single command, no installation required. Run Truffle Develop by typing the following into a terminal: This will run the client on It will display the first 10 accounts and the mnemonic used to create those accounts. ( Read more about account mnemonics .) Truffle Develop uses the same mnemonic every time to make developing your applications as easy as possible: candy maple cake sugar pudding cream honey rich smoot Continue reading >>

Aur (en) - Geth-git

Aur (en) - Geth-git

abigen, bootnode, disasm, evm, geth, gethrpctest, rlpdump mist ( mist-git ) (optional) Mist dapp browser and Ethereum wallet. veox, yeah looks broken, also puppeth is not being installed. diff --git a/PKGBUILD b/PKGBUILDindex [`7dd8af3`](100644--- a/PKGBUILD+++ b/[email protected]@ -19,13 +19,17 @@ optdepends=( 'mist: Mist dapp browser and Ethereum wallet.' ) provides=(- 'geth'- 'abigen'- 'bootnode'- 'disasm'- 'evm'- 'gethrpctest'- 'rlpdump'+ 'geth'+ 'abigen'+ 'bootnode'+ 'evm'+ 'rlpdump'+ 'ethkey'+ 'faucet'+ 'p2psim'+ 'puppeth'+ 'swarm'+ 'wnode' ) source=("${pkgname}::git+Continue reading >>

Developers' Entry | Ethereum Frontier Guide

Developers' Entry | Ethereum Frontier Guide

NOTE: These instructions are for people who want to contribute Go source code changes.If you just want to run ethereum, use the normal Installation Instructions This document is the entry point for developers of the etherum go implementation. Developers here refer to the hands-on: who are interested in build, develop, debug, submit a bug report or pull request or contribute to go-ethereum with code. We assume that you have go v1.4 installed , and GOPATH is set. Note:You must have your working copy under $GOPATH/src/github.com/ethereum/go-ethereum. You also usually want to checkout the develop branch (instead of master). Since go does not use relative path for import, working in any other directory will have no effect, since the import paths will be appended to $GOPATH/src, and if the lib does not exist, the version at master HEAD will be downloaded. Most likely you will be working from your fork of go-ethereum, let's say from github.com/nirname/go-ethereum. Clone or move your fork into the right place: git clone [email protected]:nirname/go-ethereum.git $GOPATH/src/github.com/ethereum/go-ethereum go-ethereum uses Godep to manage dependencies. Make sure that go binaries are on your executable path: godep should be prepended to all go calls build, install and test. Alternatively, you can prepend the go-ethereum Godeps directory to your current GOPATH: Switch to the go-ethereum repository root directory (Godep expects a local Godeps folder ). Each wrapper/executable found in the cmd directory can be built individually. Note: Geth (the ethereum command line client) is the focus of the Frontier release . See integration testing information on the Testing wiki page geth can do node behaviour monitoring, aggregation and show performance metric charts. Read about metrics and moni Continue reading >>

How To Build A Private Ethereum Blockchain

How To Build A Private Ethereum Blockchain

Step 5: Create an account to use as the coinbase for your blockchain node An Ethereum account is the public key that stores ether that will be used in your private blockchain to pay for gas fees. Before we start the blockchain, we need to create an account that the mining rewards will be deposited too. You will be prompted to set a password for the account, DONT FORGET YOUR PASSWORD, you will not be able to recover it later and wont be able to spend the ether you mine or unlock that account. After entering the password twice, you should expect to get a response back like this: Address: {941f1f0b08757457be0b52d83a1e3e566473ed61} This is the public key of the Ethereum account. Ethereum convention is to prefix accounts with 0x so the account is sometimes seen as 0x941f1fobo8757457be0b52d83a1e3e566473ed61. Step 6: Create JSON File for Genesis Block to Bootstrap Private Blockchain Using a text editor, create a file CustomGenesis.json with the following contents: Step 7: Initialize the blockchain from your CustomGenesis.json file go-ethereum/build/bin/geth init ./CustomGenesis.json You should expect to see output similar to this: INFO[0223|20:20:03] Allotted 128MB cache and 1024 file handles to /home/ubuntu/.ethereum/geth/chaindata INFO[0223|20:20:04] closed db:/home/ubuntu/.ethereum/geth/chaindata INFO[0223|20:20:04] Allotted 128MB cache and 1024 file handles to /home/ubuntu/.ethereum/geth/chaindata INFO[0223|20:20:04] successfully wrote genesis block and/or chain rule set: 5dd3be94dcbf5216aaa3e82700fb51a831257df5d45d984941a0a32ee0f960d8 Congratulations! You have initialized a private Ethereum blockchain!! Before we move on, lets take a break for some optional exploration of the files we have generated. In your home directory you will now see a hidden directory called.ether 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 >>

More in ethereum