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Setup Your Own Private Proof-of-authority Ethereum Network Withgeth

Setup Your Own Private Proof-of-authority Ethereum Network Withgeth

Setup your own private Proof-of-Authority Ethereum network withGeth geth 1.8 was released a few days after this guide was published and fortunately does not break anything. This post is then valid and was tested for both geth 1.7.3 and geth 1.8. Awesome:) Ive learned a posteriori that the gas limit per block is dynamic . Therefore Ive updated the section 2.3 to give more information about this particular case. In my private network where blocks are most of the time empty, I dont what the gas limit to decrease at all! Clique requires int(N/2+1) sealers (where N is the number of sealers defined in the genesis file in extraData field) to be online in order to run. N=2 is the minimum accepted. See Chapter 4 for more details. Goal: step by step guide to help you setup a local private ethereum network using the Proof-of-Authority consensus engine (also named clique). In a nutshell: we will setup two nodes on the same machine, creating a peer-to-peer network on our localhost. In addition to the two nodes, a bootnode (discovery service) will also be setup. It took me quite some time and extensive research and googling to finally have a solid ethereum development environment for testing my smart contracts and my DApps. In this post, Ive decided to share how I am setting a Proof-of-Authority network using the clique consensus engine of Geth. Its my way to thank the community by giving back and hopefully making life easier for anyone willing exploring the Ethereum universe. My OS is Ubuntu 16.04 LTS (this tuto was done in a fresh virtual machine). For the Ethereum client, I am using Geth (the Go implementation of the Ethereum protocole). I believe that Geth is easy to install with plenty of great tutorials out there, so I am not gonna cover any installation here. I am currently r Continue reading >>

The Challenges Of Building Ethereum Infrastructure

The Challenges Of Building Ethereum Infrastructure

Infrastructure Engineer at Creator of Founder of Find me at The Challenges of Building Ethereum Infrastructure Several of our engineers, myself included, have spent a substantial portion of the past year working on building low level Ethereum infrastructure at BitGo. Weve encountered a plethora of challenges along the way; in this post well cover some of the more interesting ones. Our first attempt (in 2016) at building a highly indexed database of the Ethereum blockchain used EthereumJ to run the EVM in the JVM and thus parse every transaction and contract that ever occurred on the network. This ended up being a poor decision. EthereumJ was not production quality in 2016; it may be better today but according to my conversations with Ethereum developers, its still unreliable. We experienced multiple crashes, subpar documentation, and not so great developer support from the small number of EthereumJ experts. We lost count of how many times our EthereumJ client got stuck or corrupted and we had to delete the entire chainstate and re-sync from scratch. We never managed to stabilize our EthereumJ indexer to the point that we were confident it was ready for production use. Interestingly, I came across this StackExchange post that noted stability issues as of June 2017. A fundamental problem weve had while dealing with Ethereum is how to handle 256 bit numbers. The design rationale for the Ethereum Virtual Machine states: If youre hoping to store them in any popular production quality database as numeric types that you can query and manipulate as such, youre in for a surprise. We found that mongo only supports 128 bit numbers, but due to a limitation in mongoose (the NodeJS mongo driver) the actual support was 32 bits. Because our indexer has traditionally been multithreaded Continue reading >>

Stuck Looking For Peers... #1041

Stuck Looking For Peers... #1041

Top bar says "(nothing here) peers | 3,806 blocks left | 0%" and does not change. Interestingly it was working normally back couple of days. Error: invalid mix digest############################## WARN [09-12|15:31:19] Synchronisation failed, dropping peer peer=20c9ad97c081d633 err="retrieved hash chain is invalid"ERROR[09-12|15:31:28] ########## BAD BLOCK #########Chain config: {ChainID: 3 Homestead: 0 DAO: DAOSupport: true EIP150: 0 EIP155: 10 EIP158: 10 Metropolis: 9223372036854775807 Engine: ethash}Number: 1657897Hash: 0x824a47006ed5f0fadc853b28115cbc93ef6862985d3955bfdfd6d1b660be14e1Error: invalid mix digest############################## WARN [09-12|15:31:28] Synchronisation failed, dropping peer peer=6ce05930c72abc63 err="retrieved hash chain is invalid"ERROR[09-12|15:31:50] ########## BAD BLOCK #########Chain config: {ChainID: 3 Homestead: 0 DAO: DAOSupport: true EIP150: 0 EIP155: 10 EIP158: 10 Metropolis: 9223372036854775807 Engine: ethash}Number: 1657897Hash: 0x824a47006ed5f0fadc853b28115cbc93ef6862985d3955bfdfd6d1b660be14e1 Continue reading >>

Ethereum Wallet Is Stuck At

Ethereum Wallet Is Stuck At "looking For Peers"

I'm trying to create a private network or test network to work with smart contracts. But when I start ethereum wallet it is always getting stuck at "Looking for peers....". Below is the screenshot for the same. I'm using ubuntu 16.04(64-bit) and Geth version is: 1.7.3-stable At first you have to work genesis file init file name code use and file name: computer any dir file save /genesis.json { "nonce" : "0x0000000000000055", "mixHash" : "0x0000000000000000000000000000000000000000000000000000000000000000", "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000", "difficulty": "0x20000", "gasLimit" : "0x800000", "timestamp" : "0x0", "extraData" : "", "coinbase" : "0x0000000000000000000000000000000000000000", "alloc" : {}, "config" : { "chainId": 100, "homesteadBlock": 0, "eip155Block": 0, "eip158Block": 0 }} geth --datadir "D:\CHAINDATAFINAL" init genesis.json D:\CHAINDATAFINAL miens database directory and genesis file directory genesis file directory,Example E:\database\genesis.json Then private network create this commend run geth directory: geth --networkid 20 --port 60303 --rpc --lightkdf --cache 16 --datadir "D:\CHAINDATAFINAL" console then private network create check this network commend: Important Note: After that mist/ethereum wallet open If you have genesis file already init , then you do not need to genesis file init .Then you start from the private network commend run Continue reading >>

People Have Spent Over $1m Buying Virtual Cats On The Ethereum Blockchain

People Have Spent Over $1m Buying Virtual Cats On The Ethereum Blockchain

People have spent over $1M buying virtual cats on the Ethereum blockchain Launched a few days ago, CryptoKitties is essentially like an digital version of Pokemon cards but based on the Ethereum blockchain.And like most viral sensations that catch on in the tech world, its blowing up fast. Built by Vancouver and San Francisco-based design studio AxiomZen , the game is the latest fad in the world of cryptocurrency and probably soon tech in general. People are spending a crazy amount of real money on the game. So far about $1.3M has been transacted , with multiple kittens selling for ~50 ETH (around $23,000) and the genesis kitten being sold for a record ~246 ETH (around $113,000). This third party site tracks the largest purchases made to date on the game. And like any good viral sensation prices are rising and fluctuating fast. Right now it will cost you about .03 ETH, or $12 to buy the least expensive kitten in the game. So now we have people using Ether, an asset with arguably little tangible utility to purchase an asset with unarguably zero tangible utility. Welcome to the internet in 2017. In all seriousness, its a little bit reminiscent of the beanie baby trend where people were paying insane amounts of money for stuffed animals. But if the popularity continues to increase these people may be able to make a return by reselling or breeding their rare kittens, or theyll be stuck holding the virtual cryptographic keys to a virtual rare kitten when the market crashes in a few day, like eventually happened with beanie babies. There are a few cool things about the game though, and putting aside the valuation absurdity its actually a cool way for beginners to interact with the Ethereum blockchain. First off, its important to understand that since its played on the Ethere Continue reading >>

Ethereum Wallet Is Stuck At

Ethereum Wallet Is Stuck At "looking For Peers"

I'm trying to create a private network or test network to work with smart contracts. But when I start ethereum wallet it is always getting stuck at "Looking for peers....". Below is the screenshot for the same. I'm using ubuntu 16.04(64-bit) and Geth version is: 1.7.3-stable At first you have to work genesis file init file name code use and file name: computer any dir file save /genesis.json { "nonce" : "0x0000000000000055", "mixHash" : "0x0000000000000000000000000000000000000000000000000000000000000000", "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000", "difficulty": "0x20000", "gasLimit" : "0x800000", "timestamp" : "0x0", "extraData" : "", "coinbase" : "0x0000000000000000000000000000000000000000", "alloc" : {}, "config" : { "chainId": 100, "homesteadBlock": 0, "eip155Block": 0, "eip158Block": 0 }} geth --datadir "D:\CHAINDATAFINAL" init genesis.json D:\CHAINDATAFINAL miens database directory and genesis file directory genesis file directory,Example E:\database\genesis.json Then private network create this commend run geth directory: geth --networkid 20 --port 60303 --rpc --lightkdf --cache 16 --datadir "D:\CHAINDATAFINAL" console then private network create check this network commend: Important Note: After that mist/ethereum wallet open If you have genesis file already init , then you do not need to genesis file init .Then you start from the private network commend run Continue reading >>

$160 Million Stuck: Can Parity Still Shake Up Ethereum?

$160 Million Stuck: Can Parity Still Shake Up Ethereum?

$160 Million Stuck: Can Parity Still Shake Up Ethereum? Feb 1, 2018 at 05:00 UTC|UpdatedFeb 2, 2018 at 05:02 UTC When life gives you lemons to the tune of nearly $160 million, it's not so easy to make lemonade. But that's just what ethereum startup Parity Technologies is seeking to do after a rough 2017, a year in which it suffered one of the most high-profile breaches in the history of blockchain. Far from a sinister hack, though, it's had to face that its fortunes effectively changed when a novice developer "accidentally" froze the funds so no one could access them . Worse still, attempts at getting the money back don't exactly look promising . Entering 2018, that could have an impact beyond just a single startup. Far from a conventional business, Parity supplies support for one of the two most widely used clients on ethereum, providing software roughly a quarter of the network uses to operate. And like other blockchain conglomerates (think the ever-expanding Brooklyn startup ConsenSys), Parity has diverse interests. Also affected by the incident was the Web3 Foundation, the non-profit that oversees the development of the Polkadot blockchain, and it is also led by former ethereum CTO and Parity founder Gavin Wood. The much-heralded blockchain for blockchains raised roughly $150 million in an ICO last year, and as reported by CoinDesk , funds lost in the Parity freeze included the ICO earnings. As such, Ashley Tyson, a spokesperson for the Web3 Foundation, acknowledged that the loss to its operations has been felt. Plans to deploy bounties designed to fix code weaknesses and grant programs to spur development, she said, have been scrapped. "With a majority of our funds frozen, we're not sure what our ability is to financially contribute to these initiatives. Certainly Continue reading >>

Ethereum Digital Currency: What You Need To Know

Ethereum Digital Currency: What You Need To Know

Ethereum Digital Currency: What You Need To Know The general public first became aware of blockchain technology with the inception of bitcoin . Bitcoin, a decentralized digital currency, or cryptocurrency , allows people to send and receive funds to each other without the need for an intermediary such as a bank or payment processing company. The safety and validity of these peer-to-peer transactions is made possible by blockchain, which facilitates a public ledger of all bitcoin transfers on the network and enforces checks and balances that prevent P2Ppitfalls such as double spending and other fraudulent activity. While blockchain is in fact the underlying technology behind bitcoin, it is also utilized for a number of other purposes throughout various industries. Because of its inherent transparency and ability to securely remove the middle man when facilitating digital asset transfers, currency or otherwise, blockchain presents some very unique opportunities to enterprising developers such as the team behind the Ethereum project. Like bitcoin, Ethereum utilizes blockchain technology. Also like bitcoin, Ethereum features a cryptocurrency named Ether that can be bought, sold, traded or produced by mining. The high-level similarities end there, however, as Ethereum was created and structured with a significantly different purpose in mind. Essentially a programmable blockchain, the open source Ethereum platform can be home to a multitude of user-created decentralized applications. What this means is programmers can use Ethereum not only to design and release their own cryptocurrencies like bitcoin, but also store and execute future contracts like real estate payments or wills for example. Per its creators, Ethereum on its own is "value-agnostic" and in the end developers Continue reading >>

What Banks Can You Buy Bitcoin Ethereum Mist Wallet Only 1 Peer

What Banks Can You Buy Bitcoin Ethereum Mist Wallet Only 1 Peer

What Banks Can You Buy Bitcoin Ethereum Mist Wallet Only 1 Peer Same, although I have reluctantly had no choice but to give up Difference Between Volume Supply And Market Cap For Cryptocurrencies Cryptocurrency Code mist and use MEW although I hate doing so. The entire process of creating the wallet should take place offline. In particular, Ethereum supports smart contracts, which are agreements written in code that auto-execute when certain predetermined conditions are met. Get an Ether address with this lightweight Ethereum Web Wallet: Whats your take on etherwall desktop wallet? To use the Bitcoin Transaction How Many Confirmations Buy Ethereum Nz at all, I can only select the three original ones. To quote you directly: This is why I won't use their stuff. This is with no other applications running. With this Ethereum Faucet, you can receive free ether simply by adding your wallet address and start claiming. We tried for all that time to be fully decentralized, but we are trying to be more pragmatic now, and our number 1 priority has been to also connect to Infura or some other remote node. That had nothing to do with their client. You can do this by trading your bitcoin for ethereum on exchanges such as www. I downloaded, and installed, what I believe to be is an Ethereum Wallet at least that what it says at the top of the screen. April 25, Because anyone who knows this address can use the blockchain to find out which transactions you have made in What Banks Can You Buy Bitcoin Ethereum Mist Wallet Only 1 Peer past. That alone is a great thing. Frustrating, because it was easy to do that with a Bitcoin paperwallet, Any Bitcoin Tradestation How Start Litecoin, thx. The disadvantage of this variant is, however, that if no backup has been made and the hard disk is bro Continue reading >>

Wallet Not Finding Peers, Blocks Or Ether #1761

Wallet Not Finding Peers, Blocks Or Ether #1761

please make sure no firewall is blocking outgoing connections. Furthermore please upload your node.log as instructed below. Please, make sure you are running the latest version and your node is fully synced. Although this may take between 1h (SSD) and 10 hours (HDD) you should be able to see a progress bar on the splash-screen or in the main-window. check your account's balance using make a backup of all account's keyfiles via menu -> accounts -> backup -> accounts should the initial sync take very long, consider following these instructions to speed it up if the peer count stays at 0 and it does not sync, verify your firewall settings consider using in the meantime If this didn't solve your issue, please follow these instructions and upload the node.log files: Hi dcbentley,,Where do i find "node.log"? I am using a mac.Did you have a similiar issue? Do you know if there is any support line Ican contact? On Thu, Jun 1, 2017 at 2:51 PM dcbentley ***@***.***> wrote: Hi there @demarzano < >, I'd recommend looking over the advice from @luclu < > on how to locate the node.log file. (You might also be able to use Spotlight to find it). If you have Notepad++ it'll format it so the text is easier to read, (but isn't necessary). If the log file has warns regarding time differences, you'll need to check your System settings to make sure they are set to the correct time zone and auto update. If these are set correctly, then your system isn't polling the macOS time server correctly, and is a different issue. Mac doesn't have a direct way to interact with the UEFI to check the system clock. (I goofed and thought you were using a PC). The suggestions from @luclu < post here also helped: Continue reading >>

Solution: Help My Ethereum Client Synchronization Stuck !!!

Solution: Help My Ethereum Client Synchronization Stuck !!!

Home Blogs acloudfan's blog Solution: help my Ethereum client synchronization stuck !!! Solution: help my Ethereum client synchronization stuck !!! If you are frustrated because your GETH client is stuck and not synchronizing then you are facing a problem that many developers have faced. There are multiple reasons due to which this may be happening: You have a slow connection or your firewall may be the cause Your client is connecting to the Pre ROPSTEN-Revival network If you have already ruled out #1 and #2 then read on. The solution is here 1. Delete the chain data (or use --datadir to specify the directory for chaindata) admin.addPeer('enode://6ce05930c72abc632c58e2e4324f7c7ea478cec0ed4fa2528982cf34483094e9c[email protected]13.84.180.240:30303') admin.addPeer('enode://20c9ad97c081d63397d7b685a412227a40e23c8bdc6688c6f37e97cfbc22d2b4d[email protected]52.169.14.227:30303') 5. Once synchronization is complete, kill geth and start it normally (e.g., I used --data option) geth --identity "MyTestNode" --datadir "./data" --testnet --verbosity "4" --fast Give it a couple of hours & you should get the data This is a tried solution - works for me, hope it works for you - All the Best !!! Continue reading >>

What Is Ethereum? A Step-by-step Beginners Guide

What Is Ethereum? A Step-by-step Beginners Guide

If you want to know what is Ethereum and how it works and what it can be used for, without going deep into the technical abyss, this guide is perfect for you. Important Note: This guide assumes a basic understanding of blockchain technology. If youre unfamiliar with blockchain, check out this step by step introduction for beginners . Beyond Bitcoin & first generation decentralized applications Although commonly associated with Bitcoin , blockchain technology has many other applications that go way beyond digital currencies. In fact, Bitcoin is only one of several hundred applications that use blockchain technology today. [Blockchain] is to Bitcoin, what the internet is to email. A big electronic system, on top of which you can build applications. Currency is just one. Sally Davies, FT Technology Reporter Until relatively recently, building blockchain applications has required a complex background in coding, cryptography, mathematics as well as significant resources. But times have changed. Previously unimagined applications, from electronic voting & digitally recorded property assets to regulatory compliance & trading are now actively being developed and deployed faster than ever before. By providing developers with the tools to build decentralized applications, Ethereum is making all of this possible. At its simplest, Ethereum is an open software platform based on blockchain technology that enables developers to build and deploy decentralized applications. Is Ethereum similar to Bitcoin? Well, sort of, but not really. Like Bitcoin , Ethereum is a distributed public blockchain network. Although there are some significant technical differences between the two, the most important distinction to note is that Bitcoin and Ethereum differ substantially in purpose and capabil 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 >>

Docker - Geth 1.8.3, Cant Sync To Rinkeby.io - Stuck At: Ipc Endpoint Opened - Stack Overflow

Docker - Geth 1.8.3, Cant Sync To Rinkeby.io - Stuck At: Ipc Endpoint Opened - Stack Overflow

I cant seem to get the latest version of Geth 1.8.3 working. It stops and never starts syncing. I'm trying to get it on to the rinkeby.io testnet for smart contract testing. I had success with 1.7.3 after downloading and using ADD to copy the files to the image. But I would like to automate the build, so that it can be used in Google cloud with a deployment.yml. Currently I'm testing on my local machine since I know the firewall worked with 1.7.3. (no specific rules set) The Dockerfile builds just fine and I can see that it shows up in the rinkeby.io node list, but even after 1 hour not a single block has been synced.its stuck on: IPC endpoint opened With 1.7.3 it took 10-15 seconds to start the sync. # ----- 1st stage build -----FROM golang:1.9-alpine as builderRUN apk add --no-cache make gcc musl-dev linux-headers git curlWORKDIR /RUN curl -o rinkeby.json git clone cd /go-ethereum && make geth# ----- 2nd stage build -----FROM alpine:latestRUN apk add --no-cache ca-certificates COPY --from=builder rinkeby.json $HOME/rinkeby.jsonCOPY --from=builder /go-ethereum/build/bin/geth /usr/local/bin/ VOLUME [ "/root/.rinkeby/geth/lightchaindata" ]EXPOSE 8545 8546 30303 30304 30303/udp 30304/udpRUN geth --datadir=$HOME/.rinkeby init rinkeby.jsonCMD ["sh", "-c", "geth --networkid=4 --datadir=$HOME/.rinkeby --rpcaddr 0.0.0.0 --syncmode=fast --ethstats='Oxy:Respect my [email protected]' --bootnodes=enode://a24ac7c5484ef4ed0c5eb2d36620ba4e4aa13b8c84684e1b4aab0cebea2ae45cb[email protected]52.169.42.101:30303?discport=30304"] INFO [04-04|13:14:10] Maximum peer count ETH=25 LES=0 total=25INFO [04-04|13:14:10] Starting peer-to-peer node instance=Geth/v1.8.4-unstable-6ab9f0a1/linux-amd64/go1.9.2INFO [04-04|13:14:10] Allocated cach Continue reading >>

Fix: Ethereum Node Is Not Finding Peers On Os X

Fix: Ethereum Node Is Not Finding Peers On Os X

This post is a quick tip for anyone encountering a problem updating the Ethereum Blockchain because the Ethereum node is not finding peers, if you want to instead find out what Ethereum is then you are best reading up on the official site for now. So your Ethereum node is getting stuck whilst looking for peers and is not adding new blocks? This started happening to me even though it had previously been working for weeks. This screen could literally show for hours. After a lot of digging it turns out that the reason for this was because my computers time had become otu of sync with the network as Id turned off the Set time zone automatically using current location setting whilst traveling. How to Make Your Ethereum Node Find Peers Whilst you can turn the above setting back on, in my case it didnt work immediately and instead the solution was to manually sync the clock via the process ntpdate. Open up a Terminal window and type the following commands (you may need to type in your Macs login password as this is an admin command): This will return a domain name such as time.apple.com which you can then use in the following command: The above syncs your clock with a central timeserver which then enables you to connect with other peers. The official Ethereum Wiki states this is a common problem when experiencing trouble connecting to nodes: An accurate clock is required to participate in the Ethereum network. Check your OS for how to resync your clock (example sudo ntpdate -s time.nist.gov) because even 12 seconds too fast can lead to 0 peers. I hope someone else finds this article useful and it saves some time in hunting down your fix Continue reading >>

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