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Validate Ethereum Address Online

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 >>

Noob Question... How To Check Account Balance?

Noob Question... How To Check Account Balance?

I'm working out my mining rig.. Been mining for about 12 hours.. I'd like to check my account balance to verify that transfers are happening to my account but I can't seem to figure out how to check the account balance. I'm pool mining at ethpool if that makes any difference. I did put my account ID in the config file and my bat file. So I know the account is attached to my mining instance. So.. what is the way to check account balance? Continue reading >>

On The Importance Of Addresses And Checksums - Ethereum

On The Importance Of Addresses And Checksums - Ethereum

On the importance of addresses and checksums I read on twitter today a response to @ErikVoorhees tweet today: I'm finding myself holding some extra ETH to use as payments, since Bitcoin is becoming too expensive/delayed :( One person answering to this tweet says: @ErikVoorhees @SegWit $ETH HORRIBLE for payments right now NO CHECKSUM ON ADDRESS #Litecoin makes far more sense, stable value too v fiat It resonated with me, as I always have thought that ethereum, which otherwise is miles ahead of the others, have a substantial fundamental flaw in its address format. Yes, I am aware of [ ], but it is a band-aid with many flaws. Perhaps the largest flaw is that it is very random where it is implemented. I can submit a "checksumed" address, but if the counterparty hasn't implemented the checksum algos, it will gladly accept it. Further, it is hard or impossible to ex-ante determine if the receptor will invalidate the address if it is incorrect. Just tested a popular site, shapeshift.io, and they gladly accept ANY ethereum address, regardless of the checksum-casing applied. I know that the idea from the developers was that these addresses were not supposed to be used directly. Well, that was a wrong assumption. They are used as bitcoin addresses indeed, but compared to bitcoin, which have a 32bit checksum, ethereum has a very very weak one that is only occasionally implemented. I believe that this fundamental flaw is a big speedbump for using these addresses as payment, they are very fragile. Create a new, completely different format so that it is easily recognizable, with a 1:1 mapping. Prefix the bitcoin format with ETH or similar, for instance "ETHb1tCoinf0rma7w1LLdo" Use of a name service like ENS or similar. This is the solution I have heard, that the ethereum developers Continue reading >>

Blockchain Developer Api For Ethereum | Blockcypher

Blockchain Developer Api For Ethereum | Blockcypher

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

How To Do An Ethereum Transaction, & Check Your Balance? | Cryptocompare.com

How To Do An Ethereum Transaction, & Check Your Balance? | Cryptocompare.com

How to make an Ethereum Transaction, & check your balance? Once you have managed to set up an Ethereum Miner using either your GPU or your CPU its time to start checking your balance and start trading. Were going to show you how you can check your balance in Command Prompt, how to convert between all the different values of Ether , such as the base unit Wei, and how to make your first transaction! Once you have set up your miner via running the Geth program and Ethminer program (see our guide here on how to get started), you need to open up a third Command Prompt Window. Step 1: This can be done by right clicking on the command prompt in the taskbar at the bottom of your screen and then clicking on the command prompt that appears at the top of the menu. A third command prompt should now be open. Step 2: You now need to tell this Command Prompt where to look to get up and running. Usually the command Prompt window opens looking at your user profile. If this is the case you need to tell Command Prompt to go to wherever you installed geth. In our guide we installed it straight on the C Drive so we need to tell command prompt to get back to the C Drive which we do by typing in cd C:\ and pressing enter. Step 3: You then need to tell Command Prompt what to do. In this case you need to tell it to attach to Geth. So all you type in is geth attach which should look like this C:/>geth attach and then press enter. You now have a console up and running talking to geth so you can start asking it questions or telling it to do things. Remember for"geth attach" to work you need to have anotherCommand Prompt Window runningwith "geth --rpc". If you want to find out your address you type in eth.coinbase. This should look like this C:/>eth.coinbase. Press enter and you should see your ad Continue reading >>

How Ethereum Works - Coindesk

How Ethereum Works - Coindesk

CoinDesk Launches 2017 Year in Review Opinion and Analysis Series Now that we've covered what ethereum is, let's dive deeper into how the platform functions under the hood. Consider the online notebook application described in " What is Ethereum? " Using ethereum, the appdoesn't require one entityto store and control its data. To accomplish this, ethereum borrows heavily from bitcoin's protocol and its blockchain design, but tweaks it to support applications beyond money. Ethereum aims to abstract away bitcoin's design, however, so that developers can create applications or agreements that have additional steps, new rules of ownership, alternative transaction formats or different ways to transfer state. The goal of ethereum's 'Turing-complete' programming language is to allow developers to write more programs in which blockchain transactions could govern and automate specific outcomes. This flexibility is perhaps ethereum's primary innovation, as explained in the guide " How Ethereum Smart Contracts Work ". The structure of the ethereum blockchain is very similar to bitcoin's, in that it is a shared record of the entire transaction history. Every node on the network stores a copy of this history. The big difference withethereum is that its nodes store the most recent state of each smart contract, in addition to all of the ether transactions. (This is much more complicated than described, but the text below should help you get your feet wet.) For each ethereum application, the network needs to keep track of the 'state', or the current information of all of these applications, including each user's balance, all the smart contract code and where it's all stored. Bitcoin uses unspent transaction outputs to track who has how muchbitcoin. While it sounds more complex, the id Continue reading >>

Accounts, Addresses, Public And Private Keys, And Tokens

Accounts, Addresses, Public And Private Keys, And Tokens

Accounts, Addresses, Public And Private Keys, And Tokens The format of your private key is 3a1076bf45ab87712ad64ccb3b10217737f7faacbf2872e88fdd9a537d8fe266. The format of your account (which is generated from your public key) is 0xC2D7CF95645D33006175B78989035C7c9061d3F9. Note that there is a lowercase version 0xc2d7cf95645d33006175b78989035c7c9061d3f9 and a partially uppercase version 0xC2D7CF95645D33006175B78989035C7c9061d3F9. The partially uppercase version has a checksum to verify the address. See EIP55 - Yet another cool checksum address encoding The password encrypted private key is stored in a JSON file with the following format (newlines and indents added for clarity, example on OS/X): $ more ~/Library/Ethereum/keystore/UTC--2017-03-18T05-48-53.504714737Z--c2d7cf95645d33006175b78989035c7c9061d3f9 {"address":"c2d7cf95645d33006175b78989035c7c9061d3f9", "crypto":{ "cipher":"aes-128-ctr", "ciphertext":"0f6d343b2a34fe571639235fc16250823c6fe3bc30525d98c41dfdf21a97aedb", "cipherparams":{ "iv":"cabce7fb34e4881870a2419b93f6c796" }, "kdf":"scrypt", "kdfparams"{ "dklen":32, "n":262144, "p":1, "r":8, "salt":"1af9c4a44cf45fe6fb03dcc126fa56cb0f9e81463683dd6493fb4dc76edddd51" }, "mac":"5cf4012fffd1fbe41b122386122350c3825a709619224961a16e908c2a366aa6" }, "id":"eddd71dd-7ad6-4cd3-bc1a-11022f7db76c", "version":3} How To Create New Accounts (or Addresses) How To Create A New Account In Go Ethereum (geth) You can generate a new Ethereum account by executing geth account new if you already have the geth Ethereum node software installed: $ geth account newYour new account is locked with a password. Please give a password. Do not forget this password.Passphrase: xxxxxxxxRepeat passphrase: xxxxxxxxAddress: {4e6cf0ed2d8bbf1fbbc9f2a100602ceba4bf1319} A UTC--{year}-{month}--{account} enc Continue reading >>

Ethereumjs By Ethereumjs

Ethereumjs By Ethereumjs

browser-builds : browser builds of ethereumjs libraries common : the genesis data for the blockchain ethereumjs-abi : ABI encoding and decoding ethereumjs-account : account schema encoding, decoding and validation ethereumjs-block : block schema encoding, decoding and validation ethereumjs-blockchain : manage a blockchain ethereumjs-codesim : run EVM or Solidity code and examine the output ethereumjs-icap : utilities for handling ICAP (Ethereum in IBAN) encoding ethereumjs-lib : meta package for loading the other ethereumjs- modules ethereumjs-testing : transforms the official test vectors to a format suitable for ethereumjs ethereumjs-tx : transaction creation, manipulation, signing and verification ethereumjs-units : Ethereum unit conversion ethereumjs-util : a collection of frequently used methods by the other libraries ethereumjs-wallet : lightweight toolkit for managing Ethereum keys, including HD wallet support ethereumjs-vm : a complete EVM (Ethereum Virtual Machine) and state processing implementation geth.js : start and stop geth from Node.js helpeth : purists' commandline tool for key and transaction management keythereum : create, import and export Ethereum keys merkle-patricia-tree : This is an implementation of the modified merkle patricia tree as specified in the Ethereum yellow paper node-blockchain-server : aims to provide a full Ethereum node implementation node-devp2p : implementation of the RLPx transport protocol for Ethereum (used between nodes) node-devp2p-dpt : implementation of the RLPx DPT (peer table) protocol for Ethereum node-devp2p-eth : implementation of the Ethereum sub-protocol over RLPx node-devp2p-manager : peer manager for DPT & RLPx Continue reading >>

Ether - How Can I Check If An Ethereum Address Is Valid? - Ethereum Stack Exchange

Ether - How Can I Check If An Ethereum Address Is Valid? - Ethereum Stack Exchange

How can I check if an Ethereum address is valid? I've read many times that you should never input an address by hand unless you want to accidentally send Ether into no-mans-land. I'd like to know what those checksums might be. Is there a way to tell a typo is occurred? how, and what are the formatting rules to it? Im asking so I can potentially create a wrapper function that checks for these things before submitting to the network. EIP 55 added a "capitals-based checksum" which was implemented by Geth by May 2016.Here's Javascript code from Geth: /** * Checks if the given string is an address * * @method isAddress * @param {String} address the given HEX adress * @return {Boolean}*/var isAddress = function (address) { if (!/^(0x)?[0-9a-f]{40}$/i.test(address)) { // check if it has the basic requirements of an address return false; } else if (/^(0x)?[0-9a-f]{40}$/.test(address) || /^(0x)?[0-9A-F]{40}$/.test(address)) { // If it's all small caps or all all caps, return true return true; } else { // Otherwise check each case return isChecksumAddress(address); }};/** * Checks if the given string is a checksummed address * * @method isChecksumAddress * @param {String} address the given HEX adress * @return {Boolean}*/var isChecksumAddress = function (address) { // Check each case address = address.replace('0x',''); var addressHash = sha3(address.toLowerCase()); for (var i = 0; i < 40; i++ ) { // the nth letter should be uppercase if the nth digit of casemap is 1 if ((parseInt(addressHash[i], 16) > 7 && address[i].toUpperCase() !== address[i]) || (parseInt(addressHash[i], 16) <= 7 && address[i].toLowerCase() !== address[i])) { return false; } } return true;}; ICAP has a checksum which can be verified. You can review Geth's icap.go and here's a snippet from it: // validCheckSu Continue reading >>

Ether.cards

Ether.cards

Ether cards are 'physical ether'. They're a quick and convenient way to give ether, tokens, or other blockchain assets to friends and family, and a great way to introduce people to the power of the Ethereum blockchain. Load an Ether Card from any wallet that supports scanning QR codes. The card can be redeemed using MyCrypto, MyEtherWallet, or our own token sweeping tool. Each card has its own unique Ethereum address, printed on the back in QR code and text form, and a private key, hidden under a scratch-off panel. To use one, simply scan the code, deposit some Ether or tokens using your favourite wallet app, and give it to the lucky recipient. When they want to redeem it, they can scratch off the panel, and use their own wallet app to 'sweep' the funds into their newly created account. Each unscratched card's security is guaranteed by a smart contract . Ether cards are available for purchase now, with free worldwide shipping and a minimum order of just two cards. We're having slight stock issues at the moment - orders placed now should ship by January 12 Easily verify that you have a genuine Ether Card, and that a guarantee deposit has been paid on it. Step by step instructions on installing a wallet and claiming your ether. Go to www.mycrypto.com , and click "Send Ether". Under "Select the format of your private key", choose "Mnemonic Phrase". Enter the phrase on the back of your card, and click "Unlock". If your card has a QR code instead of a phrase, see the instructions for redeeming a classic ether card . When you click Unlock, you will be presented with a list of addresses and balances. The first address in the list (already selected) will match the one printed on the card. Click "Unlock". You will be shown information about your Ether Card account, including ac 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 >>

Accessing Your Ether Wallets Private Keys On Blockchain.info

Accessing Your Ether Wallets Private Keys On Blockchain.info

Accessing your Ether wallets Private Keys on Blockchain.info Currently, many companies support creation and use of Ether wallets. Its possible to send and receive ETH easily, without being need to download the whole Blockchain for the task. However, many of these wallets havent added support for ERC-20 tokens. These tokens are used often as a trading value in many ICOs, and also given to the users as payment for their contribution. With Chronologics ICO it wasnt different. There are steps to be taken to visualize and use these tokens for some wallets. Now, lets talk about the wallets that really allow users full control over their address. Among them we have Jaxx, MyEtherWallet, Blockchain.info, and others. If youve made your contribution from any of these rest assured that with a few simple steps you can manage and even transfer your DAY tokens. However, if youve sent your contribution from Coinbase, Bittrex, Poloniex, FreeWallet, BTC Markets or Kraken, among others, then you have a problem. In order to check the DAY tokens inside your ETH address, you dont need to unblock/open your wallet, rather only type your wallets address on EtherScan.io or Ethplorer.io. Now, if you really want to move your DAY tokens, or any other ERC-20 asset from those wallets, then youll have to access it using the Private Key, JSON file and password, etc. Today well feature a quick tutorial on how to recover your Private Key from an Ether wallet hosted by Blockchain.info. Step #1: Login into your Blockchain.info account. Step #2: Click on Ether (left side of your screen). Step #3: Select the option Export Private Key, as demonstrated below. Step #4: This warning mentions the implied risks of exposing your Private Key. Basically, never let anyone else see it and always double-check the websi Continue reading >>

Ether - How Can I Check If An Ethereum Address Is Valid? - Ethereum Stack Exchange

Ether - How Can I Check If An Ethereum Address Is Valid? - Ethereum Stack Exchange

How can I check if an Ethereum address is valid? I've read many times that you should never input an address by hand unless you want to accidentally send Ether into no-mans-land. I'd like to know what those checksums might be. Is there a way to tell a typo is occurred? how, and what are the formatting rules to it? Im asking so I can potentially create a wrapper function that checks for these things before submitting to the network. Updated May 2016: EIP 55 added a "capitals-based checksum" and has been implemented by Geth.Here's Javascript code from Geth: /** * Checks if the given string is an address * * @method isAddress * @param {String} address the given HEX adress * @return {Boolean}*/var isAddress = function (address) { if (!/^(0x)?[0-9a-f]{40}$/i.test(address)) { // check if it has the basic requirements of an address return false; } else if (/^(0x)?[0-9a-f]{40}$/.test(address) || /^(0x)?[0-9A-F]{40}$/.test(address)) { // If it's all small caps or all all caps, return true return true; } else { // Otherwise check each case return isChecksumAddress(address); }};/** * Checks if the given string is a checksummed address * * @method isChecksumAddress * @param {String} address the given HEX adress * @return {Boolean}*/var isChecksumAddress = function (address) { // Check each case address = address.replace('0x',''); var addressHash = sha3(address.toLowerCase()); for (var i = 0; i < 40; i++ ) { // the nth letter should be uppercase if the nth digit of casemap is 1 if ((parseInt(addressHash[i], 16) > 7 && address[i].toUpperCase() !== address[i]) || (parseInt(addressHash[i], 16) <= 7 && address[i].toLowerCase() !== address[i])) { return false; } } return true;}; ICAP has a checksum which can be verified. You can review Geth's icap.go and here's a snippet from it: // val Continue reading >>

Ethereum Address Validator: Tool To Validate Eth Addresses?

Ethereum Address Validator: Tool To Validate Eth Addresses?

Ethereum is an open source, unrestricted, blockchain based distributing computer platform that features scripting (smart contract) functionality. The platform provides a decentralized virtual machine known as the EVM (Ethereum virtual machine). This machine has the capability to execute scripts using public nodes spread all over the globe. Ethereum has also provided a cryptocurrency that is referred to as Ether. The currency can be transferred from one account to another and can be used in compensating all participating nodes for the computations they perform. There is an internal transaction mechanism used to determine the pricing referred to as Gas, and its used primarily in spam mitigation. It also assists in allocating resources throughout the network. The Process of Checking an Ethereum Address The Ethereum Address Validator is a tool that is used in validating Ethereum addresses. The validator is designed for use in cases where payers need to verify whether a transaction receiver has correctly communicated his or her address. It was designed to prevent scenarios where a payment is sent to an unrecoverable or mistyped Ethereum address. Benefits of the Ethereum Address Validator It is backward compatible with common hex parsers, especially those that accept mixed case letters. This allows it to be slowly introduced as time goes by. Ethereum Address Validator ensures that characters do not surpass the 40 length limit The address checksum has been encoded in lower and upper case variation of A-F hexadecimal letters that are contained in an address. This means that if the typed address only includes lowercase letters, it will not be possible to establish whether that particular address is valid or not. When this happens, you will need to request the address sender to Continue reading >>

How Do Bitcoin Transactions Work? - Coindesk

How Do Bitcoin Transactions Work? - Coindesk

Bitcoin transactions are sent from and to electronic bitcoin wallets , and are digitally signed for security. Everyone on the network knows about a transaction, and the history of a transaction can be traced back to the point where the bitcoins were produced. Holding onto bitcoins is great if you’re a speculator waiting for the price to go up, but the whole point of this currency is to spend it, right? So, when spending bitcoins, how do transactions work? There are no bitcoins, only records of bitcoin transactions Here’s the funny thing about bitcoins: they don’t exist anywhere, even on a hard drive. We talk about someone having bitcoins, but when you look at a particular bitcoin address, there are no digital bitcoins held in it, in the same way that you might hold pounds or dollars in a bank account. You cannot point to a physical object, or even a digital file, and say “this is a bitcoin”. Instead, there are only records of transactions between different addresses, with balances that increase and decrease. Every transaction that ever took place is stored in a vast public ledger called the block chain. If you want to work out the balance of any bitcoin address, the information isn’t held at that address; you must reconstruct it by looking at the blockchain. If Alice sends some bitcoins to Bob, that transaction will have three pieces of information: An input. This is a record of which bitcoin address was used to send the bitcoins to Alice in the first place (she received them from her friend, Eve). An amount. This is the amount of bitcoins that Alice is sending to Bob. An output. This is Bob's bitcoin address. To send bitcoins, you need two things: a bitcoin address and a private key. A bitcoin address is generated randomly, and is simply a sequence of lett Continue reading >>

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