It is worth noting that you can use any of the other Ethereum blockchain explorer services-like Ethplorer and Etherchain, for instance-to checksum a blockchain address. npm package ethereum-checksum-address, we found that it has been Why zero amount transaction outputs are kept in Bitcoin Core chainstate database? There is no higher authority to appeal to in the event of a mistake. Heres an example of the same address as a: This case sensitivity is used for checksum validation. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? These are the functions you're looking for: specification of the corresponding EIP and the implementation. Enter an Ethereum address you wish to convert to a checksum version in the search box located at the top of the webpage. Here you may to watch about ethereum address checksum. Input can be with/without 0x prefix, but Output always has 0x prefix. addr (str): Hexadecimal address, 40 characters long with 2 characters prefix Hello, I was going to withdraw my ETH from Trezor to an exchange, my surprise is when I entered my exchange address and the following message appears: When I press on the message the only change that is made is the following: 0x5FBc2b6C19EE3DD5f9Af96ff337DDC89e30ceAef, 0x5fbc2b6c19ee3dd5f9af96ff337ddc89e30ceaef. Ethereum Address Checksum Explained - Checksummed vs non-Checksummed ETH Address, Ethereum addresses can be written in two ways - in a non-checksummed variety with all lower case letters and checksummed version that includes capital letters, Checksummed addresses are preferable to their non-checksummed counterparts since they ensure address validity and prevent potential typos, Ethereum address can be easily checksummed using any of the popular blockchain explorer services. The npm package ethereum-checksum-address receives a total of Then let's run our node server. with at least one new version released in the past 12 months. Ethereum Checksum Address is an open source software project. Please mention the error details that you have encountered with, you can also get in touch with us :contact@dapp-world.com. This will return the checksum version of the givenaddress. In the upper left corner of the page, you can see the blockchain address (highlighted in red in the image below). Inactive project. The best answers are voted up and rise to the top, Not the answer you're looking for? issues status has been detected for the GitHub repository. If you find this article is helpful, it would be greatly appreciated if you could tip Ether to the address below. Minimize your risk by selecting secure & well maintained open source packages, Scan your application to find vulnerabilities in your: source code, open source dependencies, containers and configuration files, Easily fix your code by leveraging automatically generated PRs, New vulnerabilities are discovered every day. To help you get started, we've collected the most common ways that To learn more, see our tips on writing great answers. Replacing broken pins/legs on a DIP IC package. For test ethers and link tokens. Code Example code:example.js let lowerCaseAddress . You can convert either an upper or lower case Ethereum address to Checksum address. Ethereum addresses are displayed in HEX, so they are not case sensitive. Last updated on Insert your Ethereum address in the search field 3. Such unfortunate situations can easily be prevented with checksum. package, such as next to indicate future releases, or stable to indicate | Trezor | Yes | Python and C | Package Health Score 45 / 100. Enter an Ethereum address you wish to convert toa checksum version in the search box located at the top of the webpage. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Note that the input to the Keccak256 hash is the lowercase hexadecimal string (i.e. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. [Online serial]. we can use the following utility function. For the second question, you can just use web3.utils.toChecksumAddress('0xd034739c2ae807c70cd703092b946f62a49509d1'); in order to convert it to a checksum address. npm . Available: https://eips.ethereum.org/EIPS/eip-55. Visit Snyk Advisor to see a But please update after an address has been checksummed to say, "this address has been checksummed" rather than "this address had already been checksummed." Our Ethereum address, as well as every other Ethereum address in existence, has two versions - one that includes uppercase letters and one that doesnt. How to derive an ETH Address from a PublicKey? You will be taken to an overview of the inputted address 4. It is worth noting that in late 2021, Ethereum Name Servicea decentralized name system built on Ethereumstarted providing users the option to attach easy-to-remember domain names to their ETH addresses. Connect and share knowledge within a single location that is structured and easy to search. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. A checksummed address is simply an Ethereum address with some of the letters capitalized. What's the difference between a power rail and a signal line? By extending the EIP-55 checksum algorithm it is possible to achieve this objective. the npm package. rev2023.3.3.43278. Convert Ethereum address to a checksummed address. In principle similar to DNS, ENS allows users to use domain names (e.g. Is it possible to create a concave light? Find centralized, trusted content and collaborate around the technologies you use most. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. for ethereum-checksum-address, including popularity, security, maintenance You could capitalize or lower-case any of the letters, and the address is still the same since A and a are the same in HEX. Please be aware that this is valid only for Ethereum addresses. Go to etherscan.io 2. How to convert Ethereum address to Checksum address. Exciting news! This means, there may be other tags available for this Start using ethereum-checksum-address in your project by running `npm i ethereum-checksum-address`. Keep track of your holdings and explore over 10,000 cryptocurrencies. popularity section marion county florida building department. If the chain id passed to the function belongs to a network that opted for using this checksum variant, prefix the address with the chain id and the 0x separator before calculating the hash. When in doubt, always send something small first to make sure, but in the case of capitalization, it wont make a difference. While both addresses are viable and lead to the same destination, using the checksummed version is always preferable. 1170 ETH to CAD exchange rate Mar, 2023 and 1170 Ethereum to Canadian Dollar conversion data by Conversion Ai provides historical chart price for 1170 Ethereum to Canadian Dollar with easy to use tools like 1170 ETH to CAD converter to help you get the best 1170 ETH to CAD quote today. Get started with Snyk for free. This is a ~50x improvement over ICAP, but not as good as a 4-byte check code. This EIP is in the process of being peer-reviewed. Acidity of alcohols and basicity of amines. Could you clarify your issue, please? Is there an interactive online version anywhere? My question is if is there any tool that can fix my address (add checksum). | Ledger | Yes | C | You can read more about it in eip-55 "Mixed-case checksum address encoding" and MetaMask is one of the wallet that do support the mixed-case checksum addresses completely. Blockchain tutorial 14: Checksum . But you might not know that Ether comprises unique subdenominations, many named for influential players in the worlds of compsci, crypto and cypherpunk. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Better pattern to detect web3 default account when using metamask, Transaction is visible on Ethereum blockchain explorer, but token is not displayed in Metamask wallet, Sending a custom token with web3 + metamask, I need a simple way to sign data via web3 and metamask. The address is compared against the raw binary keccak-256 hash of the address bytes, and where there are letters in the same corresponding place as a 1 bit, the letter is capitalized. Run toChecksumAddress web3.utils.toChecksumAddress (address) Will convert an upper or lowercase Ethereum address to a checksum address. The npm package ethereum-checksum-address receives a total # Takes a 20-byte binary address as input, # Treat the hex address as ascii/utf-8 for keccak256 hashing, # Iterate over each character in the hex address, # Check if the corresponding hex digit (nibble) in the hash is 8 or higher, "0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed", "0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359", "0xdbF03B407c01E7cD3CBea99509d93f8DDDC8C6FB", "0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb", Backwards compatible with many hex parsers that accept mixed case, allowing it to be easily introduced over time. Convert to checksum address in ETH Coins and transactions Transactions ethereum barracala August 2, 2021, 4:42pm #1 Hello, I was going to withdraw my ETH from Trezor to an exchange, my surprise is when I entered my exchange address and the following message appears: "Convert to checksum address" 1170 ETH to IQD exchange rate Mar, 2023 and 1170 Ethereum to Iraqi Dinar conversion data by Conversion Ai provides historical chart price for 1170 Ethereum to Iraqi Dinar with easy to use tools like 1170 ETH to IQD converter to help you get the best 1170 ETH to IQD quote today. provides automated fix advice. stable releases. on Snyk Advisor to see the full health analysis. 1170 ETH to SRD exchange rate Mar, 2023 and 1170 Ethereum to Surinamese Dollar conversion data by Conversion Ai provides historical chart price for 1170 Ethereum to Surinamese Dollar with easy to use tools like 1170 ETH to SRD converter to help you get the best 1170 ETH to SRD quote today. 0x0089d53F703f7E0843953D48133f74cE247184c2, https://piyolab.github.io/sushiether/RunScrapboxCode/?web3=1.0.0-beta.33&code=https://scrapbox.io/api/code/sushiether/web3.js_-_Ethereum_/demo.js, web3.js - Ethereum , https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md. Could you confirm me? Scan your projects for vulnerabilities. Maintainers 1. Checksum addresses are hex addresses. safe to use. In the past month we didn't find any pull request activity or change in Convert Ethereum address to a checksummed address. Toconvert an upper or lowercase Ethereum address to a checksumaddress. Just run the following code on cmd. ENS, which was initially developed by Ethereum Foundation programers Nick Johnson and Alex Van de Sande, is designed to work similarly to Domain Naming Service (DNS), which maps domain names (e.g. & community analysis. Version published 3 months ago. After searching for the Ethereum address entered in the search field, you will be taken to an overview page showing various publicly available datalike current ETH balance, transaction history, and morepertaining to the address youve searched for. Inactive. Run checkAddressChecksum web3.utils.checkAddressChecksum (address) Checks the checksum of a given address. Just click on the link -> Login to your account ->Click on ethereum on left side bar -> create project -> settings -> keys -> endpoints and choose your respective testnet rpc url rpc url it will look like this - https://kovan.infura.io/v3/your_api_key var url = 'your RPC url here' Then run this one var web3 = new Web3(url) Simple Ethereum Address Checksum Tool. No I found out that etherscan.io is formatting address in correct form with checksum, but I still have warning from web3. 1 Answer. ClickHere, For many more exciting tutorials keep following my username@BlockTalks_Raj, Stay updated with the blockchain universe. Why zero amount transaction outputs are kept in Bitcoin Core chainstate database? We found that ethereum-checksum-address demonstrates a positive version release cadence let lowerCaseAddress = "0x0089d53f703f7e0843953d48133f74ce247184c2", 0x0089d53F703f7E0843953D48133f74cE247184c2, Convert Ethereum address to Checksum address, https://scrapbox.io/sushiether/web3.js_-_Ethereum_%E3%81%AE%E3%82%A2%E3%83%89%E3%83%AC%E3%82%B9%E3%82%92%E3%83%81%E3%82%A7%E3%83%83%E3%82%AF%E3%82%B5%E3%83%A0%E4%BB%98%E3%81%8D%E3%82%A2%E3%83%89%E3%83%AC%E3%82%B9%E3%81%AB%E5%A4%89%E6%8F%9B%E3%81%99%E3%82%8B, https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md. Learn more about Stack Overflow the company, and our products. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? 3. https://tokenmarket.net/ethereum-address-validator, https://ethereum.stackexchange.com/questions/1374/how-can-i-check-if-an-ethereum-address-is-valid, Convert C# Date/Time to DB2 TimeStamp Format, MEX vs WSDL and base address matches scheme http error, Powershell Format Date/Time for Display and for FileName, Powershell get new files, i.e. such, ethereum-checksum-address popularity was classified as On some forum I have read that it is because Ethereum uses hexadecimal addresses, which are basically not case sensitive. | MyEtherWallet | Yes | JavaScript | | EthereumJS-util | Yes | JavaScript | There's no "had already been checksummed" message, only "address is already checksummed" when the input address is already in the correct form. A checksummed version of the Ethereum address is listed on the address overview page. Thanks for contributing an answer to Ethereum Stack Exchange! There are 17 other projects in the npm registry using ethereum-checksum-address. Thanks Nic, happy that you like it! On average there will be 15 check bits per address, and the net probability that a randomly generated address if mistyped will accidentally pass a check is 0.0247%. Your Ethereum addressas well as every other Ethereum address in existencehas two versions - one that includes uppercase letters and one that doesnt. | ENS address-encoder | Yes | TypeScript |. |-|-|-| it watches for a file system integrity. A place where magic is studied and practiced? files less than x day old, PowerShell: Find files within x seconds of each other, possible duplicates, PowerShell to Sort Contents of Each File in Directory (Recursively), BizTalk SQL Queries Orchestrations/SendPorts either way, How to Set URL and Authorization Token in BizTalk Dynamic REST Post, How to put password in BizTalk WCF-SQL Binding (Error: Value cannot be null), BizTalk Send Dynamic File from Orchestration, Access denied \AppData\Local\Temp\PID###### does not appear to be a BizTalk Assembly, PowerShell to build AWS Lambda Zip for Upload, Download WinSCP 5.7.7 for BizTalk 2016 (or 5.15.4 for BizTalk 2020), How to rename multiple fields (columns) in a MongoDB Collection (Table), How to modify a every field on every document(row) in a MongoDB Collection to Lowercase/Uppercase. So both are correct. You can convert either an upper or lower case Ethereum address to Checksum address. The npm package ethereum-checksum-address was scanned for found. Ethereum Improvement Proposals (EIPs) describe standards for the Ethereum platform, including core protocol specifications, client APIs, and contract standards. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? to learn more about the package maintenance status. Asking for help, clarification, or responding to other answers. ethereum-checksum-address popularity level to be Small. In English, convert the address to hex, but if the ith digit is a letter (ie. However, our wallet does a checksum to see if the address is valid, and the capitalization is used to make this check. Latest version: 0.0.8, last published: 10 months ago. coincodex.com) to IP addresses. Does a summoned creature play immediately after being summoned by a ready action? There are multiple services that convert non-checksummed Ethereum addresses to a checksummed, but we found the easiest way is to use etherscan.io: Use your preferred internet browser to navigate to ethererscan.io. You can convert either an upper or lower case Ethereum address to Checksum address. These are called the checksummed and non-checksummed versions. While some services cant read checksum addresses, they will simply ignore the capital letters and process your address as normal, meaning there is no disadvantage to always using a checksummed address. Weekly downloads 16,764 decreased by-0.79 % As MIT. See the full 2. If you want a hex address from a checksummed address, simply convert the chekcsummed address to lower case with address.toLowerCase (). Visit the What is the point of Thrower's Bandolier? Then we need web3 module in our server so run the following code, we will be needing a Blockchain network to create an account so get an rpc url fromhere, Just click on the link -> Login to your account ->Click onethereumon left side bar ->create project->settings->keys->endpoints, and choose your respective testnet rpc url, rpc url it will look like this -https://kovan.infura.io/v3/your_api_key. Ethereum wallet installation and fix. Will also return false on non-checksum addresses. 7,096 downloads a week. well-maintained, Get health score & security insights directly in your IDE, '0x90f8bf6a479f320ead074411a4b0e7944ea8c9c1', // '0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1', '0x90F8BF6A479F320EAD074411A4B0E7944EA8C9C1', '0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1', View more ways to use ethereum-checksum-address. Superspeed: See Ethereum at a price you like and purchase it instantly on Coinmama. ethereum-checksum-address. As such, we scored Convert Ethereum address to a checksummed address https://github.com/miguelmota/ethereum-checksum-address Related Projects file system checksum checker C fswatch is a small, simple utility that detects changes in a filesystem. npm . Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin?). Convert Ethereum address to a checksummed address. coincodex.eth) instead of a long string of numbers and letters when transferring ETH and ERC20 tokens. How to Install & Set up the Ethereum wallet and purchase ether. Does a summoned creature play immediately after being summoned by a ready action? its one of abcdef) print it in uppercase if the 4*ith bit of the calculated hash is 1 otherwise print it in lowercase. and other data points determined that its maintenance is Your checksummed Ethereum address can be found at the top of the page It's more lightweight than web3.js. Learn more about ethereum-checksum-address: package health score, popularity, security, maintenance, versions and more. 257 ETH to MOP exchange rate Mar, 2023 and 257 Ethereum to Macau Pataca conversion data by Conversion Ai provides historical chart price for 257 Ethereum to Macau Pataca with easy to use tools like 257 ETH to MOP converter to help you get the best 257 ETH to MOP quote today. 1170 ETH to MXN exchange rate Mar, 2023 and 1170 Ethereum to Mexican Peso conversion data by Conversion Ai provides historical chart price for 1170 Ethereum to Mexican Peso with easy to use tools like 1170 ETH to MXN converter to help you get the best 1170 ETH to MXN quote today. There are 16 other projects in the npm registry using ethereum-checksum-address. address String: An address string. 3 March-2023, at 18:53 (UTC). You might be asking yourself, why dont Ethereum addresses already come with checksum as standard, which is the case with Bitcoin wallet addresses? it checks inode, links, uid, gid, mode, size, flags, ctime, checksum (SHA1). Quickly convert among Ether denominations to learn how much you have. ethereum-checksum-address is being used within popular public projects. When you send it though, this transaction will still go through and show up just fine. These are called the checksummed and non-checksummed version. Thank you! How do I align things in the following tabular environment? Making statements based on opinion; back them up with references or personal experience. Convert Ethereum address to a checksummed address. The EIP-55 was created to prevent users from losing funds by sending them to invalid addresses. package health analysis Fix quickly with automated Juliano Rizzo(@juli), "ERC-1191: Add chain id to mixed-case checksum address encoding [DRAFT]," Ethereum Improvement Proposals, no. Submit . If you find this article is helpful, it would be greatly appreciated if you could tip Ether to the address below. ethers.js also does the job. As a side note, weve blurred out the last five digits of the Ethereum address used in the guide for privacy reasons. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. In a new version of web3 you have to use web3.utils.toChecksumAddress. This project has seen only 10 or less contributors. Superpower: Compare the exchange rates for Bitcoin or Ether. Latest version: 0.0.8, last published: 8 months ago. It was very confusing for a newbie like me. First run npm to install js-sha3 (See GitHub https://github.com/emn178/js-sha3 Get notified if your application is affected. ed25519 curve25519 djb crypto public keys edwards montgomery elliptic 0.3.0 Published 2 years ago Ethereum DeFi Language Support We refer to multi . But the address that you call the "ethereum address" is just an address that contain a check-sum. Ethereumaddress checksum validation is a cryptographic function that allows users to verify their blockchain addresses to ensure they are valid and don't contain any typos. Learn more about how to use ethereum-checksum-address, based on ethereum-checksum-address code examples created from the most popular ways it is used in public projects. If you are interested in this EIP, please participate using this discussion link. How to perform checksum and prevent sending tokens to the wrong Ethereum address? Convert Ethereum address to a checksummed address. As a side note, we've blurred out the last five digits of the Ethereum address used in the guide for privacy reasons. 1. known vulnerabilities and missing license, and no issues were 0.0.8 latest. This EIP extends EIP-55 by optionally adding a chain id defined by EIP-155 to the checksum calculation. That's it; youve successfully checksummed your Ethereum address and ensured no loss of funds can occur when transferring Ethereum-native digital assets. You can read more about it in eip-55 "Mixed-case checksum address encoding" and MetaMask is one of the wallet that do support the mixed-case checksum addresses completely. Convert Ethereum address to a checksummed address. Want crypto even faster? import eth_utils def checksum_encode(addr): # Takes a 20-byte binary address as input hex_addr = addr.hex() checksummed_buffer = "" # Treat the hex address as ascii/utf-8 for keccak256 hashing hashed_address = eth_utils.keccak(text=hex_addr).hex() # Iterate over each character in the hex address for nibble_index, character in enumerate(hex_addr): Making statements based on opinion; back them up with references or personal experience. Recovering from a blunder I made while emailing a professor. Convert an ethereum address to Checksum address using solidity and nodejs, convert an upper or lowercase Ethereum address to a, How to interact with smart contarct from backend node js, Deploy Smart Contract on Polygon POS using Hardhat, Accept an ERC20 token as payment in Smart Contract, Non-checksummed version: 0x12ae66cdc592e10b60f9097a7b0d3c59fce29876, Checksummed version: 0x12AE66CDc592e10B60f9097a7b0D3C59fce29876. Snyk scans all the packages in your projects for vulnerabilities and GitHub. In simpler terms, checksum validation is a way to tell if an address is valid and doesnt contain any typos. rev2023.3.3.43278. Convert Ethereum address to a checksummed address, https://lab.miguelmota.com/ethereum-checksum-address. fixes. How to detect if an address is a contract? the hex address encoded as ASCII): Vitalik Buterin<[emailprotected]>, Alex Van de Sande<[emailprotected]>, "ERC-55: Mixed-case checksum address encoding," Ethereum Improvement Proposals, no. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. . Is the MetaMask address always ALL lower case? Updated Jan 18, 2021. In the case of a Bitcoin address, it is important to stay with the exact format that the address has (with exact capitalize and lower-case letters). Unbeknownst to you, the address stored in your clipboard could be different from the one you copied. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. small. CoinCodex is a cryptocurrency data website that tracks 23389 cryptocurrencies trading on 420 exchanges and provides live crypto prices. Latest version published 11 months ago. Ensure all the packages you're using are healthy and Based on project statistics from the GitHub repository for the Creating an offline address creator for Ethereum. By means of a minimal code change on existing libraries, users are protected from losing funds by mixing addresses of different Ethereum based networks. His reasoning as to why Ethereum addresses did not come with checksum implemented at the get-go is that users should never have to interact with the hexadecimal version of the addresses at all, as Ethereum is supposed to eventually transition to actual domain names like BobsEtherAddress.eth for Ethereum addresses and ICAP address versions, compatible with systems using the International Bank Account Number or IBAN conventions. Thanks for contributing an answer to Stack Overflow! Thus the package was deemed as Convert the address using the same algorithm defined by EIP-55 but if a registered chain id is provided, add it to the input of the hash function. Due to the nature of cryptocurrencies, you are the sole owner of your address and your funds. ethereum-checksum-address is missing a Code of Conduct. . How to convert Ethereum address to Checksum address You can convert either an upper or lower case Ethereum address to Checksum address. 55, January 2016. Is it correct to use "the" before "materials used in making buildings are"? If you prefer a simple web version, check out EthSum: Disclaimer: I'm the author, it's an open source tool. Using indicator constraint with two variables. Ethereum addresses are actually case-insensitive. Copyright and related rights waived via CC0. Ether is the cryptocurrency used within the blockchain network Ethereum. Replcae your address in the following url of etherscan https://etherscan.io/address/{address} like this: you want the checksum for address 0x0fd60495d705f4fb86e1b36be396757689fbe8b3 so you need to call https://etherscan.io/address/0x0fd60495d705f4fb86e1b36be396757689fbe8b3 then copy the address with valid checksum 0x0Fd60495d705F4Fb86e1b36Be396757689FbE8B3 on the loaded page. Valid or Convert Ethereum Address to CheckSum Format in NodeJS First run npm to install js-sha3 (See GitHub https://github.com/emn178/js-sha3 This example show how to do it without using web3 library, in case you don't have an ETH node to connect to, or can't get the library working. Would you rather want to see "address has been checksummed" all the time? It is worth noting that you can use any of the other Ethereum blockchain explorer serviceslike Ethplorer and Etherchain, for instanceto checksum a blockchain address. Why do many companies reject expired SSL certificates as bugs in bug bounties? How to fix checksum mismatch in downloaded node for Ethereum Wallet? With the importance of Ethereum checksum addresses outlined in the paragraphs above, you are now probably wondering how to checksum your own Ethereum address. Convert an ethereum address to Checksum address using . Announcing our $4.6M Series Seed. Available: https://eips.ethereum.org/EIPS/eip-1191. | MyCrypto | Yes | JavaScript | Add a checksum to the Ethereum wallet address to make it case sensitive. of 7,096 weekly downloads. Then convert the address to hexadecimal, but if the ith digit is a letter (ie. Online, video, article, discuss, story, explanation, suggestion, youtube. Why is the difference, and what is the thinking for MM to not use Ethereum format? See the full convert ethereum address to checksum. ethereum-checksum-address Convert Ethereum address to a checksummed address.
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