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vacy policies. We recommend reviewing these policies to understand how your information may be collected and used. For further details, please see the 'about Hotjar' section of Hotjar's support site . 8. Transfer of Information to Other Jurisdictions Aelf operates and engages service providers in various jurisdictions. Therefore, we and our service providers may transfer your personal information to, or store or access it in, jurisdictions that may not provide levels of data protection that are equivalent to those of your home jurisdiction. By using our Website, you acknowledge and agree to such transfers and processing, including to and in the United States. We will take steps to ensure that your personal information receives an adequate level of protection in the jurisdictions in which we process it. If you are a resident in the European Economic Area (EEA) or United Kingdom (UK), then these countries may not necessarily have data protection laws or other similar laws as comprehensive as those in your country. We will however take all necessary measures to protect your personal information in accordance with this privacy policy and applicable laws. - European Commission’s Standard Contractual ClauseWe have implemented measures to protect your personal information, including by using the European Commission’s Standard Contractual Clauses for transfers of personal information between our group companies and between us and our third-party providers. These clauses require all recipients to protect all personal information that they process originating from the EEA or UK in accordance with European data protection laws and regulations. Our Standard Contractual Clauses can be provided upon request. We have implemented similar appropriate safeguards with our third-party service providers and partners and further details can be provided upon request. 9. Duration of Storage of Information We will only keep your personal information for as long as it is necessary for the purposes set out in this Privacy Policy, unless a longer retention period is required or permitted by law (such as tax, accounting or other legal requirements). No purpose in this Privacy Policy will require us keeping your personal information for longer than 2 years. When we have no ongoing legitimate business need to process your personal information, we will either delete or anonymize such information, or, if this is not possible (for example, because your personal information has been stored in backup archives), then we will securely store your personal information and isolate it from any further processing until deletion is possible. 10. Maintaining security of the Information We have implemented appropriate technical and organizational security measures designed to protect the security of any personal information we collect and process. However, please remember: - Despite our safeguards and efforts to secure your information, unfortunately no electronic transmission over the Internet or information storage technology can be guaranteed to be 100% secure, so we cannot promise or guarantee that hackers, cybercriminals, or other unauthorized third parties will not be able to defeat our security, and improperly collect, access, steal, or modify your information. - Transmission of personal information to and from our Website is at your own risk. You should only access the Website within a secure environment. - You are responsible for your username and password and should keep them safe. - If you believe your privacy has been breached, please contact us immediately here . 11. Your Rights and Choices In some regions (like the EEA and UK), you have certain rights under applicable data protection laws. These may include the right to : - Request access and obtain a copy of your personal information. - Request rectification or erasure. - Restrict the processing of your personal information and, if applicable, to data portability. - In certain circumstances, you may also have the right to object to the processing of your personal information. - If we are relying on your consent to process your personal information, you have the right to withdraw your consent at any time. Please note however that this will not affect the lawfulness of the processing before its withdrawal, nor will it affect the processing of your personal information conducted in reliance on lawful processing grounds other than consent. 12. Controls For Do-not-track Features Most web browsers and some mobile operating systems and mobile applications include a Do-Not-Track (“DNT”) feature or setting you can activate to signal your privacy preference not to have data about your online browsing activities monitored and collected. At this stage no uniform technology standard for recognizing and implementing DNT signals has been finalized. As such, we do not currently respond to DNT browser signals or any other mechanism that automatically communicates your choice not to be tracked online. If a standard for online tracking is adopted that we must follow in the future, we will inform you about that practice in a revised version of this privacy policy. 13. Changes To This Privacy Policy We may update this Privacy Policy from time to time. The updated version will be indicated by an updated “Revised” date and the updated version will be effective as soon as it is accessible. If we make material changes to this privacy policy, we may notify you either by prominently posting a notice of such changes or by directly sending you a notification. We encourage you to review this Privacy Policy frequently to be informed of how we are protecting your information. 14. Contact Us If you have questions or comments about this privacy policy, you may email us here . 15. How Can You Review, Update, Or Delete The Data We Collect From You? Based on the applicable laws of your country, you may have the right to request access to the personal information we collect from you, change that information, have any inaccurate information corrected or delete it in some circumstances. To request to review, update, or delete your personal information, please contact us on the above provided details. ## /legal/cookie-policy Last updated: 25 June 2024 This Cookie Policy explains how Aelf Pte Ltd ("Company," "we," "us," and "our") uses cookies and similar technologies to recognize you when you visit our website at https://www.aelf.com ("Website"). It explains what these technologies are and why we use them, as well as your rights to control our use of them. This may help us to provide you with a good experience when you browse our Websites and may also allow us to improve our Websites. By continuing to browse the Websites, you are agreeing to our use of cookies as well as the terms of this policy (the “Cookie Policy”). Please note that in some cases we may use cookies to collect personal information, or that becomes personal information if we combine it with other information. What are cookies? Cookies are small data files that are placed on your computer or mobile device when you visit a website. Cookies are widely used by website owners in order to make their websites work, or to work more efficiently, as well as to provide reporting information. Cookies set by the website owner are called "first-party cookies." Cookies set by parties other than the website owner are called "third-party cookies." Third-party cookies enable third-party features or functionality to be provided on or through the website (e.g., advertising, interactive content, and analytics). The parties that set these third-party cookies can recognize your computer both when it visits the website in question and also when it visits certain other websites. Why do we use cookies? We use first- and third-party cookies for several reasons. Some cookies are required for technical reasons in order for our Website to operate, and we refer to these as "essential" or "strictly necessary" cookies. Other cookies also enable us to track and target the interests of our users to enhance the experience on our Online Properties. Third parties serve cookies through our Website for advertising, analytics, and other purposes. This is described in more detail below. How can I control cookies? You have the right to decide whether to accept or reject cookies. You can exercise your cookie rights by setting your preferences in the Cookie Consent Manager. The Cookie Consent Manager allows you to select which categories of cookies you accept or reject. Essential cookies cannot be rejected as they are strictly necessary to provide you with services. The Cookie Consent Manager can be found in the notification banner and on our website. If you choose to reject cookies, you may still use our website though your access to some functionality and areas of our website may be restricted. You may also set or amend your web browser controls to accept or refuse cookies. The specific types of first- and third-party cookies served through our Website and the purposes they perform are described in the table below (please note that the specific cookies served may vary depending on the specific Online Properties you visit): How can I control cookies on my browser? As the means by which you can refuse cookies through your web browser controls vary from browser to browser, you should visit your browser's help menu for more information. The following is information about how to manage cookies on the most popular browsers: - Chrome - Internet Explorer - Firefox - Safari - Edge - Opera In addition, most advertising networks offer you a way to opt out of targeted advertising. If you would like to find out more information, please visit: - Digital Advertising Alliance - Digital Advertising Alliance of Canada - European Interactive Digital Advertising Alliance What about other tracking technologies, like web beacons? Cookies are not the only way to recognize or track visitors to a website. We may use other, similar technologies from time to time, like web beacons (sometimes called "tracking pixels" or "clear gifs"). These are tiny graphics files that contain a unique identifier that enables us to recognize when someone has visited our Website or opened an email including them. This allows us, for example, to monitor the traffic patterns of users from one page within a website to another, to deliver or communicate with cookies, to understand whether you have come to the website from an online advertisement displayed on a third-party website, to improve site performance, and to measure the success of email marketing campaigns. In many instances, these technologies are reliant on cookies to function properly, and so declining cookies will impair their functioning. Do you use Flash cookies or Local Shared Objects? Websites may also use so-called "Flash Cookies" (also known as Local Shared Objects or "LSOs") to, among other things, collect and store information about your use of our services, fraud prevention, and for other site operations. If you do not want Flash Cookies stored on your computer, you can adjust the settings of your Flash player to block Flash Cookies storage using the tools contained in the Website Storage Settings Panel. You can also control Flash Cookies by going to the Global Storage Settings Panel and following the instructions (which may include instructions that explain, for example, how to delete existing Flash Cookies (referred to "information" on the Macromedia site), how to prevent Flash LSOs from being placed on your computer without your being asked, and (for Flash Player 8 and later) how to block Flash Cookies that are not being delivered by the operator of the page you are on at the time). Please note that setting the Flash Player to restrict or limit acceptance of Flash Cookies may reduce or impede the functionality of some Flash applications, including, potentially, Flash applications used in connection with our services or online content. Do you serve targeted advertising? Third parties may serve cookies on your computer or mobile device to serve advertising through our Website. These companies may use information about your visits to this and other websites in order to provide relevant advertisements about goods and services that you may be interested in. They may also employ technology that is used to measure the effectiveness of advertisements. They can accomplish this by using cookies or web beacons to collect information about your visits to this and other sites in order to provide relevant advertisements about goods and services of potential interest to you. The information collected through this process does not enable us or them to identify your name, contact details, or other details that directly identify you unless you choose to provide these. How often will you update this Cookie Policy? We may update this Cookie Policy from time to time in order to reflect, for example, changes to the cookies we use or for other operational, legal, or regulatory reasons. Please therefore revisit this Cookie Policy regularly to stay informed about our use of cookies and related technologies. The date at the top of this Cookie Policy indicates when it was last updated. Where can I get further information? If you have any questions about our use of cookies or other technologies, please contact us here . ## /about-aelf 📄️ Introduction What is aelf? 📄️ ELF token What is ELF? 📄️ Wallet Supported wallets 📄️ Technical & Security Keep your ELF safe 📄️ Governance Participate by voting 📄️ Partnerships & Ecosystem Get involved 📄️ Grants Kick start your project 📄️ Investments Get funded 📄️ Community Engagement Feature requests & bugs reporting 📄️ aelf and AI aelf's relationship with AI ## /quick-start/developers/hello-world-contract On this page Creating your first contract Description : This is the simplest contract to get you started. It introduces the basic structure of a smart contract and shows how to deploy and interact with it. Purpose : To familiarize you with the basic syntax and deployment process of smart contracts on aelf blockchain. Difficulty Level : Easy Step 1 - Setting up your development environment Local Codespaces Basic knowledge of terminal commands IDE - Install VS Code Note for Apple Silicon users: Ensure that Rosetta is installed, if it is not, use the following command: Terminal softwareupdate --install-rosetta Install Required Packages Install dotnet 8.0.x SDK Install aelf contract templates Linux and macOs Windows Terminal dotnet new --install AElf.ContractTemplates Command Prompt dotnet new install AElf.ContractTemplates AELF.ContractTemplates contains various predefined templates for the ease of developing smart contracts on the aelf blockchain. Install aelf deploy tool Terminal dotnet tool install --global aelf.deploy aelf.deploy is a utility tool for deploying smart contracts on the aelf blockchain. Please remember to export PATH after installing aelf.deploy. info ℹ️ Note: If you have installed aelf.deploy and your terminal says that there is no such command available, please uninstall and install aelf.deploy. Install Node.js and Yarn Install Node.js Install Yarn Install aelf-command Linux and macOs Windows Terminal sudo npm i -g aelf-command Command Prompt npm i -g aelf-command aelf-command is a CLI tool for interacting with the aelf blockchain, enabling tasks like creating wallets and managing transactions. Provide required permissions while installing aelf-command globally. Visit aelf-devcontainer-template . Click the Use this template button. Choose Create a new repository . Enter a suitable repository name. Click Create repository . Within the GitHub interface of your new repository, click on Code . Select Codespaces . Click on the + sign to create a new Codespace. After some time, your workspace will load with the contents of the repository. You can now continue your development using GitHub Codespaces. Step 2 - Develop Smart Contract Start Your Smart Contract Project Open your Terminal . Enter the following command to generate a new project: Terminal mkdir hello-world cd hello-world dotnet new aelf -n HelloWorld Adding Your Smart Contract Code Now Hello World template ready, let's customize it to add our own contract logic. We'll start by creating methods to update and read a message stored in the contract. Enter this command in your Terminal . Terminal cd src The implementation of file src/HelloWorldState.cs is as follows: HelloWorldState.cs using AElf . Sdk . CSharp . State ; namespace AElf . Contracts . HelloWorld { // The state class is access the blockchain state public class HelloWorldState : ContractState { // A state that holds string value public StringState Message { get ; set ; } } } The implementation of file src/HelloWorld.cs is as follows: HelloWorld.cs // contract implementation starts here namespace AElf . Contracts . HelloWorld { public class HelloWorld : HelloWorldContainer . HelloWorldBase { // A method that updates the contract state, Message with a user input public override Empty Update ( StringValue input ) { State . Message . Value = input . Value ; Context . Fire ( new UpdatedMessage { Value = input . Value } ) ; return new Empty ( ) ; } // A method that reads the contract state, Message public override StringValue Read ( Empty input ) { var value = State . Message . Value ; return new StringValue { Value = value } ; } } } Building Smart Contract Build the new code with the following commands inside src folder: Terminal dotnet build Step 3 - Deploy Smart Contract Create A Wallet To send transactions on the aelf blockchain, you must have a wallet. Run this command to create aelf wallet. Terminal aelf-command create You will be prompted to save your account, please do save your account as shown below: Terminal ? Save account info into a file? ( Y/n ) Y Make sure to choose Y to save your account information. tip ℹ️ Note: If you do not save your account information (by selecting n or N), do not export the wallet password. Only proceed to the next step if you have saved your account information. Next, enter and confirm your password. Then export your wallet password as shown below: Linux and macOs Windows Terminal export WALLET_PASSWORD = "YOUR_WALLET_PASSWORD" Command Prompt $env :WALLET_PASSWORD = "YOUR_WALLET_PASSWORD" Acquire Testnet Tokens (Faucet) for Development To deploy smart contracts or execute on-chain transactions on aelf, you'll require testnet ELF tokens. Get ELF Tokens Go to https://faucet-ui.aelf.dev Enter your address and click Get Tokens . Deploy Smart Contract: The smart contract needs to be deployed on the chain before users can interact with it. Run the following command to deploy a contract. Remember to export the path of HelloWorld.dll.patched to CONTRACT_PATH. Linux and macOs Windows Terminal export CONTRACT_PATH = $( find ~+ . -path "*patched*" | head -n 1 ) Terminal aelf-deploy -a $WALLET_ADDRESS -p $WALLET_PASSWORD -c $CONTRACT_PATH -e https://tdvw-test-node.aelf.io/ Command Prompt $CONTRACT_PATH = Get-ChildItem -Recurse -Filter "*patched*" | Select-Object -First 1 -ExpandProperty FullName $env :CONTRACT_PATH = $CONTRACT_PATH Command Prompt aelf-deploy -a $env :WALLET_ADDRESS -p $env :WALLET_PASSWORD -c $env :CONTRACT_PATH -e https://tdvw-test-node.aelf.io/ Please wait for approximately 1 to 2 minutes. If the deployment is successful, it will provide you with the contract address. Copy the smart contract address from the address field Export your smart contract address: Linux and macOs Windows Terminal export CONTRACT_ADDRESS = "YOUR_SMART_CONTRACT_ADDRESS e.g. 2LUmicHyH4RXrMjG4beDwuDsiWJESyLkgkwPdGTR8