{"id":13564,"date":"2024-11-24T19:31:36","date_gmt":"2024-11-24T19:31:36","guid":{"rendered":"https:\/\/blockchainagentur.de\/smart-contract-programming\/"},"modified":"2024-11-24T19:31:36","modified_gmt":"2024-11-24T19:31:36","slug":"smart-contract-programming","status":"publish","type":"blog_posts","link":"https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/","title":{"rendered":"Programming smart contracts with Solidity in the blockchain &#8211; for beginners"},"content":{"rendered":"<section class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text]<\/p>\n<h1 style=\"text-align: center;\"><span id=\"Programming_Smart_Contracts_with_Solidity_in_the_Blockchain_For_Beginners\"><strong>Programming Smart Contracts with Solidity in the Blockchain \u2013 For Beginners<\/strong><\/span><\/h1>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;12315&#8243; img_size=&#8221;full&#8221; css=&#8221;.vc_custom_1732476689448{padding-right: 20px !important;}&#8221;][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_column_text css=&#8221;.vc_custom_1732475446558{padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 20px !important;padding-left: 30px !important;}&#8221;]<br \/>\n<span style=\"font-weight: 400;\">Blockchain technology offers <\/span><b>limitless possibilities<\/b><span style=\"font-weight: 400;\">. Smart Contracts are a central component. They automate processes, ensure transparency, and are tamper-proof. In this article, you will learn step by step how to program <a class=\"wpil_keyword_link\" title=\"Smart Contracts\" href=\"https:\/\/blockchainagentur.de\/blockchain-programmieren\/\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"103\">Smart Contracts<\/a> with Solidity, how to test them, and how to deploy them on the Ethereum blockchain. You don\u2019t need any prior knowledge to create your own <a class=\"wpil_keyword_link\" title=\"Smart Contract\" href=\"https:\/\/blockchainagentur.de\/was-ist-ein-smart-contract\/\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"90\">Smart Contract<\/a>. Let\u2019s get started! <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">Inhaltsverzeichnis<\/p><ul class=\"toc_list\"><li><a href=\"#Programming_Smart_Contracts_with_Solidity_in_the_Blockchain_For_Beginners\"><span class=\"toc_number toc_depth_1\">1<\/span> Programming Smart Contracts with Solidity in the Blockchain \u2013 For Beginners<\/a><ul><li><a href=\"#How_Do_Smart_Contracts_Work_for_the_Ethereum_Blockchain\"><span class=\"toc_number toc_depth_2\">1.1<\/span> How Do Smart Contracts Work for the Ethereum Blockchain?<\/a><\/li><li><a href=\"#Getting_Started_with_Solidity\"><span class=\"toc_number toc_depth_2\">1.2<\/span> Getting Started with Solidity?<\/a><ul><li><a href=\"#Why_Solidity_Is_Perfect_for_Programming_Smart_Contracts_and_dApps_Decentralized_Applications\"><span class=\"toc_number toc_depth_3\">1.2.1<\/span> Why Solidity Is Perfect for Programming Smart Contracts and dApps (Decentralized Applications)<\/a><\/li><li><a href=\"#Solidity_The_Key_to_Modern_Blockchain_Applications\"><span class=\"toc_number toc_depth_3\">1.2.2<\/span> Solidity: The Key to Modern Blockchain Applications<\/a><\/li><\/ul><\/li><li><a href=\"#Development_of_Smart_Contracts_with_Solidity_Step_by_Step\"><span class=\"toc_number toc_depth_2\">1.3<\/span> Development of Smart Contracts with Solidity: Step by Step<\/a><\/li><li><a href=\"#1_Write_Your_First_Contract_in_Remix\"><span class=\"toc_number toc_depth_2\">1.4<\/span> 1. Write Your First Contract in Remix<\/a><ul><li><a href=\"#Step_1_Open_Remix\"><span class=\"toc_number toc_depth_3\">1.4.1<\/span> Step 1: Open Remix<\/a><\/li><li><a href=\"#Step_2_Create_a_New_File\"><span class=\"toc_number toc_depth_3\">1.4.2<\/span> Step 2: Create a New File<\/a><\/li><li><a href=\"#Step_3_Write_the_First_Smart_Contract\"><span class=\"toc_number toc_depth_3\">1.4.3<\/span> Step 3: Write the First Smart Contract<\/a><\/li><\/ul><\/li><li><a href=\"#2_Compile_the_Code\"><span class=\"toc_number toc_depth_2\">1.5<\/span> 2. Compile the Code<\/a><\/li><li><a href=\"#3_Test_Deployment_of_the_Smart_Contract\"><span class=\"toc_number toc_depth_2\">1.6<\/span> 3. Test Deployment of the Smart Contract<\/a><ul><li><a href=\"#Step_1_Choose_the_Test_Environment\"><span class=\"toc_number toc_depth_3\">1.6.1<\/span> Step 1: Choose the Test Environment<\/a><\/li><li><a href=\"#Step_2_Deploy_the_Contract\"><span class=\"toc_number toc_depth_3\">1.6.2<\/span> Step 2: Deploy the Contract<\/a><\/li><li><a href=\"#Step_3_Test_the_Functions\"><span class=\"toc_number toc_depth_3\">1.6.3<\/span> Step 3: Test the Functions<\/a><\/li><\/ul><\/li><li><a href=\"#4_Deployment_to_the_Ethereum_Blockchain\"><span class=\"toc_number toc_depth_2\">1.7<\/span> 4. Deployment to the Ethereum Blockchain<\/a><ul><li><a href=\"#Step_1_Set_Up_a_Wallet\"><span class=\"toc_number toc_depth_3\">1.7.1<\/span> Step 1: Set Up a Wallet<\/a><\/li><li><a href=\"#Step_2_Switch_to_the_Test_Network\"><span class=\"toc_number toc_depth_3\">1.7.2<\/span> Step 2: Switch to the Test Network<\/a><\/li><li><a href=\"#Step_3_Using_the_Contract\"><span class=\"toc_number toc_depth_3\">1.7.3<\/span> Step 3: Using the Contract<\/a><\/li><\/ul><\/li><li><a href=\"#5_Interaction_with_the_Real_Blockchain\"><span class=\"toc_number toc_depth_2\">1.8<\/span> 5. Interaction with the Real Blockchain<\/a><\/li><li><a href=\"#In_Conclusion\"><span class=\"toc_number toc_depth_2\">1.9<\/span> In Conclusion<\/a><\/li><li><a href=\"#More_Articles\"><span class=\"toc_number toc_depth_2\">1.10<\/span> More Articles<\/a><ul><li><ul><li><a href=\"#Bewerten_Sie_unseren_Artikel\"><span class=\"toc_number toc_depth_4\">1.10.0.1<\/span> Bewerten Sie unseren Artikel<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/div>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2 style=\"text-align: center;\"><span id=\"How_Do_Smart_Contracts_Work_for_the_Ethereum_Blockchain\"><strong>How Do Smart Contracts Work for the Ethereum Blockchain?<\/strong><\/span><\/h2>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\"><a class=\"wpil_keyword_link\" href=\"https:\/\/blockchainagentur.de\/blockchain-programmiersprache\/\" title=\"Smart Contracts\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"179\">Smart Contracts<\/a> are digital, intelligent contracts that are executed on a blockchain. They operate under the principle: \u201cIf A happens, then execute B.\u201d Everything is defined in the code.<\/span><\/p>\n<p><b>An example:<\/b><span style=\"font-weight: 400;\"> Imagine buying a concert ticket. As soon as the payment is received, the Smart Contract sends the ticket directly to you. No middleman is needed. Everything runs automatically.  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">What\u2019s special about it? The data is unchangeable. Everyone can view it, and it\u2019s not tamperable.<\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2 style=\"text-align: center;\"><span id=\"Getting_Started_with_Solidity\"><strong>Getting Started with Solidity?<\/strong><\/span><\/h2>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">Solidity is the leading <\/span><b>programming language<\/b><span style=\"font-weight: 400;\"> for creating <a class=\"wpil_keyword_link\" href=\"https:\/\/blockchainagentur.de\/erc20-token-erstellen\/\" title=\"Smart Contracts\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"296\">Smart Contracts<\/a>. It was specifically developed for the Ethereum blockchain. With Solidity, you can program complex logic and applications. The syntax is similar to JavaScript and is easy to learn. <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><span id=\"Why_Solidity_Is_Perfect_for_Programming_Smart_Contracts_and_dApps_Decentralized_Applications\"><strong>Why Solidity Is Perfect for Programming Smart Contracts and dApps (Decentralized Applications)<\/strong><\/span><\/h3>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">If you want to get into blockchain programming, Solidity is the language of choice. It was specifically developed for the <\/span><b>Ethereum blockchain<\/b><span style=\"font-weight: 400;\"> and offers the following advantages: <\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Easy<\/b><br \/>\n<span style=\"font-weight: 400;\">The syntax of Solidity is easy to learn and resembles familiar languages like JavaScript. It is <\/span><b>clearly structured<\/b><span style=\"font-weight: 400;\"> and allows developers to make quick progress. Beginners can easily write simple Smart Contracts without being intimidated by the complexity of <a class=\"wpil_keyword_link\" href=\"https:\/\/blockchainagentur.de\/distributed-ledger-technologie\/\" title=\"Blockchain-Technologie\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"152\">blockchain technology<\/a>.  <\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Flexible<\/b><br \/>\n<span style=\"font-weight: 400;\">Whether you want to program a simple function for storing values or develop a <\/span><b>complex system<\/b><span style=\"font-weight: 400;\"> for tokens or decentralized applications, Solidity provides the tools you need. With this language, you can implement versatile and innovative solutions that run directly on the blockchain.  <\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Secure<\/b><br \/>\n<span style=\"font-weight: 400;\">The Ethereum blockchain is based on <\/span><b>unchangeable transactions<\/b><span style=\"font-weight: 400;\">, and Solidity supports this feature with precise security mechanisms. Once deployed, the code is transparent and tamper-proof, which builds trust and reduces the risk of errors.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><span id=\"Solidity_The_Key_to_Modern_Blockchain_Applications\"><strong>Solidity: The Key to Modern Blockchain Applications<\/strong><\/span><\/h3>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">The <a class=\"wpil_keyword_link\" href=\"https:\/\/blockchainagentur.de\/blockchain-erstellen\/\" title=\"Entwicklung\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"219\">development<\/a> of Solidity has made it possible to implement <\/span><b>versatile applications<\/b><span style=\"font-weight: 400;\"> on the Ethereum blockchain. Whether you want to program Smart Contracts and <\/span><b>dApps<\/b><span style=\"font-weight: 400;\"> or write contracts for the Ethereum blockchain, Solidity provides you with everything you need.  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">A key component is <\/span><b>compilation<\/b><span style=\"font-weight: 400;\">. Once the program code is error-free, the Solidity compiler converts it into a format that can run on the Ethereum Virtual Machine (EVM). With tools like Remix, you can easily manage this process, test your Smart Contracts, and deploy them in the appropriate environment.  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">By integrating <\/span><b>cryptocurrencies<\/b><span style=\"font-weight: 400;\"> like Ether or even Bitcoin, complex transactions can be automated. For example, payments can be triggered as soon as a certain condition is met. Thanks to the blockchain as a decentralized storage system, all processes remain tamper-proof and traceable.  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Thus, Solidity is more than just a programming language. It is the heart of modern <\/span><b>decentralized applications<\/b><span style=\"font-weight: 400;\"> and enables the implementation of innovative business models \u2013 secure, flexible, and efficient.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2 style=\"text-align: center;\"><span id=\"Development_of_Smart_Contracts_with_Solidity_Step_by_Step\"><strong>Development of Smart Contracts with Solidity: Step by Step<\/strong><\/span><\/h2>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">Here is how to create your first Smart Contract, test it, and deploy it.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2 style=\"text-align: center;\"><span id=\"1_Write_Your_First_Contract_in_Remix\"><strong>1. Write Your First Contract in Remix<\/strong><\/span><\/h2>\n<p>[\/vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><span id=\"Step_1_Open_Remix\"><strong>Step 1: Open Remix<\/strong><\/span><\/h3>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">Visit the website <\/span><a href=\"https:\/\/remix.ethereum.org\/\"><span style=\"font-weight: 400;\">Remix<\/span><\/a><span style=\"font-weight: 400;\">. You don\u2019t have to install anything; simply enter the web address. <\/span><b>Remix<\/b><span style=\"font-weight: 400;\"> is a browser-based application. <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><span id=\"Step_2_Create_a_New_File\"><strong>Step 2: Create a New File<\/strong><\/span><\/h3>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">In the left menu, you will see an icon for <\/span><b>files<\/b><span style=\"font-weight: 400;\">. Click on it. Create a new file and name it `FirstContract.sol`.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><span id=\"Step_3_Write_the_First_Smart_Contract\"><strong>Step 3: Write the First Smart Contract<\/strong><\/span><\/h3>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">Insert the following <\/span><b>code<\/b><span style=\"font-weight: 400;\"> into the file:  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8220;`solidity<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\/\/ SPDX-License-Identifier: MIT<\/span><\/p>\n<p><span style=\"font-weight: 400;\">pragma solidity ^0.8.0;<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">contract FirstContract {<\/span><\/p>\n<p><span style=\"font-weight: 400;\">    uint public storedValue;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">    function setValue(uint _value) public {<\/span><\/p>\n<p><span style=\"font-weight: 400;\">        storedValue = _value;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">    }<\/span><\/p>\n<p><span style=\"font-weight: 400;\">    function getValue() public view returns (uint) {<\/span><\/p>\n<p><span style=\"font-weight: 400;\">        return storedValue;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">    }<\/span><\/p>\n<p><span style=\"font-weight: 400;\">}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8220;`  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">This contract stores a variable (`storedValue`) on the blockchain. You can change it with `setValue` and retrieve it with `getValue`.<\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2 style=\"text-align: center;\"><span id=\"2_Compile_the_Code\"><strong>2. Compile the Code<\/strong><\/span><\/h2>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">Switch to the <\/span><b>Solidity Compiler<\/b><span style=\"font-weight: 400;\"> tab (the gear icon). Choose version 0.8.0 or higher. Then click on Compile FirstContract.sol.  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">If errors occur, check the code for missing semicolons or brackets.<\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2 style=\"text-align: center;\"><span id=\"3_Test_Deployment_of_the_Smart_Contract\"><strong>3. Test Deployment of the Smart Contract<\/strong><\/span><\/h2>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">Once your contract has compiled without errors, you can test it in a <\/span><b>secure test environment<\/b><span style=\"font-weight: 400;\">. Remix provides the JavaScript VM for this\u2014a virtual blockchain environment that runs directly in the browser.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><span id=\"Step_1_Choose_the_Test_Environment\"><strong>Step 1: Choose the Test Environment<\/strong><\/span><\/h3>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">Switch to the <\/span><b>Deploy &amp; Run<\/b><span style=\"font-weight: 400;\"> Transactions tab (the right arrow icon). In the dropdown menu under Environment, select JavaScript VM.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><span id=\"Step_2_Deploy_the_Contract\"><strong>Step 2: Deploy the Contract<\/strong><\/span><\/h3>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">In the Deploy section, click the corresponding button. Your Smart Contract will be deployed and will appear in the list under <\/span><b>Deployed Contracts<\/b><span style=\"font-weight: 400;\">.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><span id=\"Step_3_Test_the_Functions\"><strong>Step 3: Test the Functions<\/strong><\/span><\/h3>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">Open the deployed contract and use the functions to <\/span><b>test<\/b><span style=\"font-weight: 400;\"> it. For example, you can store a number with `setValue`. Enter a number like `42` and click Transact. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Then retrieve the value with `getValue` to ensure everything works.  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">The JavaScript VM is safe and does not require real <\/span><b>cryptocurrencies<\/b><span style=\"font-weight: 400;\">. This allows you to test your Smart Contract without any risk.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2 style=\"text-align: center;\"><span id=\"4_Deployment_to_the_Ethereum_Blockchain\"><strong>4. Deployment to the Ethereum Blockchain<\/strong><\/span><\/h2>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">If your contract works as intended in the test environment, you can upload it to the real <\/span><b>Ethereum blockchain<\/b><span style=\"font-weight: 400;\">.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><span id=\"Step_1_Set_Up_a_Wallet\"><strong>Step 1: Set Up a Wallet<\/strong><\/span><\/h3>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">Download a <\/span><b>wallet<\/b><span style=\"font-weight: 400;\"> such as MetaMask and set it up. This wallet serves as the interface to the blockchain. You will also need some Ether for the <\/span><b>transaction fees<\/b><span style=\"font-weight: 400;\"> (gas).  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><span id=\"Step_2_Switch_to_the_Test_Network\"><strong>Step 2: Switch to the Test Network<\/strong><\/span><\/h3>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">It is recommended to test the Smart Contract in a test network like Ropsten or Goerli first. These networks work like the Ethereum mainnet, but you can get test Ether for free to <\/span><b>simulate<\/b><span style=\"font-weight: 400;\"> transaction costs.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h3 style=\"text-align: center;\"><span id=\"Step_3_Using_the_Contract\"><strong>Step 3: Using the Contract<\/strong><\/span><\/h3>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">Connect your wallet to Remix by selecting <\/span><b>Injected Provider \u2013 MetaMask<\/b><span style=\"font-weight: 400;\"> under <\/span><b>Environment<\/b><span style=\"font-weight: 400;\">. Make sure you are connected to the desired network.  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Click <\/span><b>Deploy<\/b><span style=\"font-weight: 400;\"> again to put the contract live on the blockchain. Confirm the transaction in your wallet. Once the transaction is complete, your contract is publicly available on the blockchain and can be viewed and used by others.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2 style=\"text-align: center;\"><span id=\"5_Interaction_with_the_Real_Blockchain\"><strong>5. Interaction with the Real Blockchain<\/strong><\/span><\/h2>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_column_text]<br \/>\n<span style=\"font-weight: 400;\">To interact with your Smart Contract, you\u2019ll need tools like Web3.js or ethers.js. Here is an example of how to use Web3.js:  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8220;`javascript<\/span><\/p>\n<p><span style=\"font-weight: 400;\">const contract = new web3.eth.Contract(abi, contractAddress);<\/span><\/p>\n<p><span style=\"font-weight: 400;\">await contract.methods.setValue(42).send({ from: userAddress });<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8220;`  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Your <\/span><b>frontend<\/b><span style=\"font-weight: 400;\"> can also communicate with the contract to send or retrieve data. This gives you a complete, <\/span><b>fully functional application<\/b><span style=\"font-weight: 400;\"> connected to the Ethereum blockchain.  <\/span><br \/>\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2 style=\"text-align: center;\"><span id=\"In_Conclusion\"><strong>In Conclusion<\/strong><\/span><\/h2>\n<p>[\/vc_column_text][vc_separator color=&#8221;juicy_pink&#8221; border_width=&#8221;5&#8243; el_width=&#8221;10&#8243;][vc_message icon_fontawesome=&#8221;&#8221;]<br \/>\n<span style=\"font-weight: 400;\">Developing Smart Contracts with Solidity is the <\/span><b>perfect entry point<\/b><span style=\"font-weight: 400;\"> into blockchain programming. With tools like Remix, you can get started right away without risking real cryptocurrencies. Follow this guide to gain your first experiences.  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">And if it doesn\u2019t work smoothly at first\u2014practice makes perfect. Start with <\/span><b>simple contracts<\/b><span style=\"font-weight: 400;\">. Expand your knowledge step by step. Soon you\u2019ll be able to develop complex applications on the Ethereum blockchain. The future is decentralized. Become part of it!  <\/span><br \/>\n[\/vc_message][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h2 style=\"text-align: center;\"><span id=\"More_Articles\"><span id=\"Weitere_Artikel\"><strong>More Articles<\/strong><\/span><\/span><\/h2>\n<p>[\/vc_column_text]<div class=\"blog-preview row\"><div class=\"item\" itemtype=\"http:\/\/schema.org\/Blog\"><div class=\"item-sd-container\"><div class=\"photo\"><a itemprop=\"url\" href=\"https:\/\/blockchainagentur.de\/kryptowaehrung-erstellen\/\"><img itemprop=\"image\" src=\"https:\/\/blockchainagentur.de\/wp-content\/uploads\/2024\/11\/Eigene-Kryptowaehrung-erstellen-in-einfachen-Schritten.png\"><\/a><\/div><div class=\"content\"><a itemprop=\"url\" href=\"https:\/\/blockchainagentur.de\/kryptowaehrung-erstellen\/\"><div class=\"title\">Eigene Kryptow\u00e4hrung erstellen in einfachen Schrit...<\/div><\/a><\/div><\/div><\/div><div class=\"item\" itemtype=\"http:\/\/schema.org\/Blog\"><div class=\"item-sd-container\"><div 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beginners\",\"image\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/blockchainagentur.de\/wp-content\/uploads\/2024\/11\/Smart-Contracts-mit-Solidity-in-der-Blockchain-programmieren-1024x576.png\",\"height\":576,\"width\":1024},\"step\":{\"@type\":\"HowToStep\",\"url\":\"https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/\",\"name\":\"Programming smart contracts with Solidity in the blockchain - for beginners\",\"text\":\"\\r\\nProgramming Smart Contracts with Solidity in the Blockchain \u2013 For Beginners\\r\\n[vc_column width=\\\"1\/2\\\"][vc_column width=\\\"1\/2\\\"]\\r\\nBlockchain technology offers limitless possibilities. Smart Contracts are a central component. They automate processes, ensure transparency, and are tamper-proof. In this article, you will learn step by step how to program Smart Contracts with Solidity, how to test them, and how to deploy them on the Ethereum blockchain. You don\u2019t need any prior knowledge to create your own Smart Contract. Let\u2019s get started! \\r\\n\\r\\nHow Do Smart Contracts Work for the Ethereum Blockchain?\\r\\n\\r\\nSmart Contracts are digital, intelligent contracts that are executed on a blockchain. They operate under the principle: \u201cIf A happens, then execute B.\u201d Everything is defined in the code.\\r\\n\\r\\nAn example: Imagine buying a concert ticket. As soon as the payment is received, the Smart Contract sends the ticket directly to you. No middleman is needed. Everything runs automatically.  \\r\\n\\r\\nWhat\u2019s special about it? The data is unchangeable. Everyone can view it, and it\u2019s not tamperable.\\r\\n\\r\\nGetting Started with Solidity?\\r\\n\\r\\nSolidity is the leading programming language for creating Smart Contracts. It was specifically developed for the Ethereum blockchain. With Solidity, you can program complex logic and applications. The syntax is similar to JavaScript and is easy to learn. \\r\\n\\r\\nWhy Solidity Is Perfect for Programming Smart Contracts and dApps (Decentralized Applications)\\r\\n\\r\\nIf you want to get into blockchain programming, Solidity is the language of choice. It was specifically developed for the Ethereum blockchain and offers the following advantages: \\r\\n\\r\\n&nbsp;\\r\\n\\r\\nEasy\\r\\nThe syntax of Solidity is easy to learn and resembles familiar languages like JavaScript. It is clearly structured and allows developers to make quick progress. Beginners can easily write simple Smart Contracts without being intimidated by the complexity of blockchain technology.  \\r\\n\\r\\n&nbsp;\\r\\n\\r\\nFlexible\\r\\nWhether you want to program a simple function for storing values or develop a complex system for tokens or decentralized applications, Solidity provides the tools you need. With this language, you can implement versatile and innovative solutions that run directly on the blockchain.  \\r\\n\\r\\n&nbsp;\\r\\n\\r\\nSecure\\r\\nThe Ethereum blockchain is based on unchangeable transactions, and Solidity supports this feature with precise security mechanisms. Once deployed, the code is transparent and tamper-proof, which builds trust and reduces the risk of errors.  \\r\\n\\r\\nSolidity: The Key to Modern Blockchain Applications\\r\\n\\r\\nThe development of Solidity has made it possible to implement versatile applications on the Ethereum blockchain. Whether you want to program Smart Contracts and dApps or write contracts for the Ethereum blockchain, Solidity provides you with everything you need.  \\r\\n\\r\\nA key component is compilation. Once the program code is error-free, the Solidity compiler converts it into a format that can run on the Ethereum Virtual Machine (EVM). With tools like Remix, you can easily manage this process, test your Smart Contracts, and deploy them in the appropriate environment.  \\r\\n\\r\\nBy integrating cryptocurrencies like Ether or even Bitcoin, complex transactions can be automated. For example, payments can be triggered as soon as a certain condition is met. Thanks to the blockchain as a decentralized storage system, all processes remain tamper-proof and traceable.  \\r\\n\\r\\nThus, Solidity is more than just a programming language. It is the heart of modern decentralized applications and enables the implementation of innovative business models \u2013 secure, flexible, and efficient.  \\r\\n\\r\\nDevelopment of Smart Contracts with Solidity: Step by Step\\r\\n\\r\\nHere is how to create your first Smart Contract, test it, and deploy it.  \\r\\n\\r\\n1. Write Your First Contract in Remix\\r\\n\\r\\nStep 1: Open Remix\\r\\n\\r\\nVisit the website Remix. You don\u2019t have to install anything; simply enter the web address. Remix is a browser-based application. \\r\\n\\r\\nStep 2: Create a New File\\r\\n\\r\\nIn the left menu, you will see an icon for files. Click on it. Create a new file and name it `FirstContract.sol`.  \\r\\n\\r\\nStep 3: Write the First Smart Contract\\r\\n\\r\\nInsert the following code into the file:  \\r\\n\\r\\n```solidity\\r\\n\\r\\n\/\/ SPDX-License-Identifier: MIT\\r\\n\\r\\npragma solidity ^0.8.0;\\r\\n\\r\\n&nbsp;\\r\\n\\r\\ncontract FirstContract {\\r\\n\\r\\n    uint public storedValue;\\r\\n\\r\\n    function setValue(uint _value) public {\\r\\n\\r\\n        storedValue = _value;\\r\\n\\r\\n    }\\r\\n\\r\\n    function getValue() public view returns (uint) {\\r\\n\\r\\n        return storedValue;\\r\\n\\r\\n    }\\r\\n\\r\\n}\\r\\n\\r\\n```  \\r\\n\\r\\nThis contract stores a variable (`storedValue`) on the blockchain. You can change it with `setValue` and retrieve it with `getValue`.\\r\\n\\r\\n2. Compile the Code\\r\\n\\r\\nSwitch to the Solidity Compiler tab (the gear icon). Choose version 0.8.0 or higher. Then click on Compile FirstContract.sol.  \\r\\n\\r\\nIf errors occur, check the code for missing semicolons or brackets.\\r\\n\\r\\n3. Test Deployment of the Smart Contract\\r\\n\\r\\nOnce your contract has compiled without errors, you can test it in a secure test environment. Remix provides the JavaScript VM for this\u2014a virtual blockchain environment that runs directly in the browser.  \\r\\n\\r\\nStep 1: Choose the Test Environment\\r\\n\\r\\nSwitch to the Deploy &amp; Run Transactions tab (the right arrow icon). In the dropdown menu under Environment, select JavaScript VM.  \\r\\n\\r\\nStep 2: Deploy the Contract\\r\\n\\r\\nIn the Deploy section, click the corresponding button. Your Smart Contract will be deployed and will appear in the list under Deployed Contracts.  \\r\\n\\r\\nStep 3: Test the Functions\\r\\n\\r\\nOpen the deployed contract and use the functions to test it. For example, you can store a number with `setValue`. Enter a number like `42` and click Transact. \\r\\n\\r\\nThen retrieve the value with `getValue` to ensure everything works.  \\r\\n\\r\\nThe JavaScript VM is safe and does not require real cryptocurrencies. This allows you to test your Smart Contract without any risk.  \\r\\n\\r\\n4. Deployment to the Ethereum Blockchain\\r\\n\\r\\nIf your contract works as intended in the test environment, you can upload it to the real Ethereum blockchain.  \\r\\n\\r\\nStep 1: Set Up a Wallet\\r\\n\\r\\nDownload a wallet such as MetaMask and set it up. This wallet serves as the interface to the blockchain. You will also need some Ether for the transaction fees (gas).  \\r\\n\\r\\nStep 2: Switch to the Test Network\\r\\n\\r\\nIt is recommended to test the Smart Contract in a test network like Ropsten or Goerli first. These networks work like the Ethereum mainnet, but you can get test Ether for free to simulate transaction costs.  \\r\\n\\r\\nStep 3: Using the Contract\\r\\n\\r\\nConnect your wallet to Remix by selecting Injected Provider \u2013 MetaMask under Environment. Make sure you are connected to the desired network.  \\r\\n\\r\\nClick Deploy again to put the contract live on the blockchain. Confirm the transaction in your wallet. Once the transaction is complete, your contract is publicly available on the blockchain and can be viewed and used by others.  \\r\\n\\r\\n5. Interaction with the Real Blockchain\\r\\n\\r\\nTo interact with your Smart Contract, you\u2019ll need tools like Web3.js or ethers.js. Here is an example of how to use Web3.js:  \\r\\n\\r\\n```javascript\\r\\n\\r\\nconst contract = new web3.eth.Contract(abi, contractAddress);\\r\\n\\r\\nawait contract.methods.setValue(42).send({ from: userAddress });\\r\\n\\r\\n```  \\r\\n\\r\\nYour frontend can also communicate with the contract to send or retrieve data. This gives you a complete, fully functional application connected to the Ethereum blockchain.  \\r\\n\\r\\nIn Conclusion\\r\\n\\r\\nDeveloping Smart Contracts with Solidity is the perfect entry point into blockchain programming. With tools like Remix, you can get started right away without risking real cryptocurrencies. Follow this guide to gain your first experiences.  \\r\\n\\r\\nAnd if it doesn\u2019t work smoothly at first\u2014practice makes perfect. Start with simple contracts. Expand your knowledge step by step. Soon you\u2019ll be able to develop complex applications on the Ethereum blockchain. The future is decentralized. Become part of it!  \\r\\n\\r\\nMore Articles\\r\\n\"}}}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Smart Contracts mit Solidity programmieren","description":"Program a smart contract in the Ethereum blockchain and everything you need for programming with Solidity.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/","og_locale":"en_US","og_type":"article","og_title":"Smart Contracts mit Solidity programmieren","og_description":"Program a smart contract in the Ethereum blockchain and everything you need for programming with Solidity.","og_url":"https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/","og_site_name":"Blockchain Agentur","og_image":[{"width":1280,"height":720,"url":"https:\/\/blockchainagentur.de\/wp-content\/uploads\/2024\/11\/Smart-Contracts-mit-Solidity-in-der-Blockchain-programmieren.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"9 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/#article","isPartOf":{"@id":"https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/"},"author":{"name":"Shopboostr","@id":"https:\/\/blockchainagentur.de\/en\/#\/schema\/person\/9fab357b653e2fe9d7e0cd5590ab65b0"},"headline":"Programming smart contracts with Solidity in the blockchain &#8211; for beginners","datePublished":"2024-11-24T19:31:36+00:00","dateModified":"2024-11-24T19:31:36+00:00","mainEntityOfPage":{"@id":"https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/"},"wordCount":1851,"commentCount":0,"publisher":{"@id":"https:\/\/blockchainagentur.de\/en\/#organization"},"articleSection":["Blockchain"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/#respond"]}]},{"@type":["WebPage","ItemPage"],"@id":"https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/","url":"https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/","name":"Smart Contracts mit Solidity programmieren","isPartOf":{"@id":"https:\/\/blockchainagentur.de\/en\/#website"},"datePublished":"2024-11-24T19:31:36+00:00","dateModified":"2024-11-24T19:31:36+00:00","description":"Program a smart contract in the Ethereum blockchain and everything you need for programming with Solidity.","breadcrumb":{"@id":"https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/blockchainagentur.de\/en\/smart-contract-programming\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/blockchainagentur.de\/en\/"},{"@type":"ListItem","position":3,"name":"Programming smart contracts with Solidity in the blockchain &#8211; 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Smart Contracts are a central component. They automate processes, ensure transparency, and are tamper-proof. In this article, you will learn step by step how to program Smart Contracts with Solidity, how to test them, and how to deploy them on the Ethereum blockchain. You don\u2019t need any prior knowledge to create your own Smart Contract. Let\u2019s get started! \r\n\r\nHow Do Smart Contracts Work for the Ethereum Blockchain?\r\n\r\nSmart Contracts are digital, intelligent contracts that are executed on a blockchain. They operate under the principle: \u201cIf A happens, then execute B.\u201d Everything is defined in the code.\r\n\r\nAn example: Imagine buying a concert ticket. As soon as the payment is received, the Smart Contract sends the ticket directly to you. No middleman is needed. Everything runs automatically.  \r\n\r\nWhat\u2019s special about it? The data is unchangeable. Everyone can view it, and it\u2019s not tamperable.\r\n\r\nGetting Started with Solidity?\r\n\r\nSolidity is the leading programming language for creating Smart Contracts. It was specifically developed for the Ethereum blockchain. With Solidity, you can program complex logic and applications. The syntax is similar to JavaScript and is easy to learn. \r\n\r\nWhy Solidity Is Perfect for Programming Smart Contracts and dApps (Decentralized Applications)\r\n\r\nIf you want to get into blockchain programming, Solidity is the language of choice. It was specifically developed for the Ethereum blockchain and offers the following advantages: \r\n\r\n&nbsp;\r\n\r\nEasy\r\nThe syntax of Solidity is easy to learn and resembles familiar languages like JavaScript. It is clearly structured and allows developers to make quick progress. Beginners can easily write simple Smart Contracts without being intimidated by the complexity of blockchain technology.  \r\n\r\n&nbsp;\r\n\r\nFlexible\r\nWhether you want to program a simple function for storing values or develop a complex system for tokens or decentralized applications, Solidity provides the tools you need. With this language, you can implement versatile and innovative solutions that run directly on the blockchain.  \r\n\r\n&nbsp;\r\n\r\nSecure\r\nThe Ethereum blockchain is based on unchangeable transactions, and Solidity supports this feature with precise security mechanisms. Once deployed, the code is transparent and tamper-proof, which builds trust and reduces the risk of errors.  \r\n\r\nSolidity: The Key to Modern Blockchain Applications\r\n\r\nThe development of Solidity has made it possible to implement versatile applications on the Ethereum blockchain. Whether you want to program Smart Contracts and dApps or write contracts for the Ethereum blockchain, Solidity provides you with everything you need.  \r\n\r\nA key component is compilation. Once the program code is error-free, the Solidity compiler converts it into a format that can run on the Ethereum Virtual Machine (EVM). With tools like Remix, you can easily manage this process, test your Smart Contracts, and deploy them in the appropriate environment.  \r\n\r\nBy integrating cryptocurrencies like Ether or even Bitcoin, complex transactions can be automated. For example, payments can be triggered as soon as a certain condition is met. Thanks to the blockchain as a decentralized storage system, all processes remain tamper-proof and traceable.  \r\n\r\nThus, Solidity is more than just a programming language. It is the heart of modern decentralized applications and enables the implementation of innovative business models \u2013 secure, flexible, and efficient.  \r\n\r\nDevelopment of Smart Contracts with Solidity: Step by Step\r\n\r\nHere is how to create your first Smart Contract, test it, and deploy it.  \r\n\r\n1. Write Your First Contract in Remix\r\n\r\nStep 1: Open Remix\r\n\r\nVisit the website Remix. You don\u2019t have to install anything; simply enter the web address. Remix is a browser-based application. \r\n\r\nStep 2: Create a New File\r\n\r\nIn the left menu, you will see an icon for files. Click on it. Create a new file and name it `FirstContract.sol`.  \r\n\r\nStep 3: Write the First Smart Contract\r\n\r\nInsert the following code into the file:  \r\n\r\n```solidity\r\n\r\n\/\/ SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.8.0;\r\n\r\n&nbsp;\r\n\r\ncontract FirstContract {\r\n\r\n    uint public storedValue;\r\n\r\n    function setValue(uint _value) public {\r\n\r\n        storedValue = _value;\r\n\r\n    }\r\n\r\n    function getValue() public view returns (uint) {\r\n\r\n        return storedValue;\r\n\r\n    }\r\n\r\n}\r\n\r\n```  \r\n\r\nThis contract stores a variable (`storedValue`) on the blockchain. You can change it with `setValue` and retrieve it with `getValue`.\r\n\r\n2. Compile the Code\r\n\r\nSwitch to the Solidity Compiler tab (the gear icon). Choose version 0.8.0 or higher. Then click on Compile FirstContract.sol.  \r\n\r\nIf errors occur, check the code for missing semicolons or brackets.\r\n\r\n3. Test Deployment of the Smart Contract\r\n\r\nOnce your contract has compiled without errors, you can test it in a secure test environment. Remix provides the JavaScript VM for this\u2014a virtual blockchain environment that runs directly in the browser.  \r\n\r\nStep 1: Choose the Test Environment\r\n\r\nSwitch to the Deploy &amp; Run Transactions tab (the right arrow icon). In the dropdown menu under Environment, select JavaScript VM.  \r\n\r\nStep 2: Deploy the Contract\r\n\r\nIn the Deploy section, click the corresponding button. Your Smart Contract will be deployed and will appear in the list under Deployed Contracts.  \r\n\r\nStep 3: Test the Functions\r\n\r\nOpen the deployed contract and use the functions to test it. For example, you can store a number with `setValue`. Enter a number like `42` and click Transact. \r\n\r\nThen retrieve the value with `getValue` to ensure everything works.  \r\n\r\nThe JavaScript VM is safe and does not require real cryptocurrencies. This allows you to test your Smart Contract without any risk.  \r\n\r\n4. Deployment to the Ethereum Blockchain\r\n\r\nIf your contract works as intended in the test environment, you can upload it to the real Ethereum blockchain.  \r\n\r\nStep 1: Set Up a Wallet\r\n\r\nDownload a wallet such as MetaMask and set it up. This wallet serves as the interface to the blockchain. You will also need some Ether for the transaction fees (gas).  \r\n\r\nStep 2: Switch to the Test Network\r\n\r\nIt is recommended to test the Smart Contract in a test network like Ropsten or Goerli first. These networks work like the Ethereum mainnet, but you can get test Ether for free to simulate transaction costs.  \r\n\r\nStep 3: Using the Contract\r\n\r\nConnect your wallet to Remix by selecting Injected Provider \u2013 MetaMask under Environment. Make sure you are connected to the desired network.  \r\n\r\nClick Deploy again to put the contract live on the blockchain. Confirm the transaction in your wallet. Once the transaction is complete, your contract is publicly available on the blockchain and can be viewed and used by others.  \r\n\r\n5. Interaction with the Real Blockchain\r\n\r\nTo interact with your Smart Contract, you\u2019ll need tools like Web3.js or ethers.js. Here is an example of how to use Web3.js:  \r\n\r\n```javascript\r\n\r\nconst contract = new web3.eth.Contract(abi, contractAddress);\r\n\r\nawait contract.methods.setValue(42).send({ from: userAddress });\r\n\r\n```  \r\n\r\nYour frontend can also communicate with the contract to send or retrieve data. This gives you a complete, fully functional application connected to the Ethereum blockchain.  \r\n\r\nIn Conclusion\r\n\r\nDeveloping Smart Contracts with Solidity is the perfect entry point into blockchain programming. With tools like Remix, you can get started right away without risking real cryptocurrencies. Follow this guide to gain your first experiences.  \r\n\r\nAnd if it doesn\u2019t work smoothly at first\u2014practice makes perfect. Start with simple contracts. Expand your knowledge step by step. Soon you\u2019ll be able to develop complex applications on the Ethereum blockchain. The future is decentralized. Become part of it!  \r\n\r\nMore Articles\r\n"}}}}]}},"multi-rating":{"mr_rating_results":[{"adjusted_star_result":0,"star_result":0,"total_max_option_value":5,"adjusted_score_result":0,"score_result":0,"percentage_result":0,"adjusted_percentage_result":0,"count":0,"post_id":13564}]},"_links":{"self":[{"href":"https:\/\/blockchainagentur.de\/en\/wp-json\/wp\/v2\/blog_posts\/13564"}],"collection":[{"href":"https:\/\/blockchainagentur.de\/en\/wp-json\/wp\/v2\/blog_posts"}],"about":[{"href":"https:\/\/blockchainagentur.de\/en\/wp-json\/wp\/v2\/types\/blog_posts"}],"author":[{"embeddable":true,"href":"https:\/\/blockchainagentur.de\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blockchainagentur.de\/en\/wp-json\/wp\/v2\/comments?post=13564"}],"version-history":[{"count":0,"href":"https:\/\/blockchainagentur.de\/en\/wp-json\/wp\/v2\/blog_posts\/13564\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blockchainagentur.de\/en\/wp-json\/wp\/v2\/media\/13414"}],"wp:attachment":[{"href":"https:\/\/blockchainagentur.de\/en\/wp-json\/wp\/v2\/media?parent=13564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blockchainagentur.de\/en\/wp-json\/wp\/v2\/categories?post=13564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blockchainagentur.de\/en\/wp-json\/wp\/v2\/tags?post=13564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}