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How To Build "Buy Me a Coffee" DeFi dApp Using Solidity
Blockchain technology enables the development of innovative applications like a decentralized "Buy Me a Coffee" application. This guide will walk you through developing and deploying a smart contract for this purpose using Alchemy, Hardhat, Ethers.js, and the Ethereum Sepolia testnet. By the end, you'll know how to: Build, test, and deploy smart contracts with Hardhat. Connect MetaMask to Sepolia via an Alchemy RPC endpoint. Obtain Sepolia ETH from a faucet. Interact with the contract using Ethers.js and build a frontend for the application. For more about smart contracts, visit our smart contract development services.Also, Read | Solidity Smart Contract Vulnerabilities and Ways To Mitigate ThemDetailed steps for building "Buy Me a Coffee" DeFi dApp Using SolidityPrerequisitesBefore starting, ensure you have:npm version 8.5.5 or higher.node version 16.13.1 or higher.An Alchemy account.Step 1: Project Setup1- Create a new directory and then navigate into it:mkdir BuyMeACoffee-contracts cd BuyMeACoffee-contracts 2- Initialize a new npm project: npm init -y3- Install Hardhat: npm install --save-dev hardhat4- Generate a Hardhat project: npx hardhatSelect "Create a JavaScript project" and agree to the defaults.5- Verify the setup by running tests: npx hardhat test Step 2: Writing the Smart Contract1. Create the smart contract file: Copy BuyMeACoffee.sol and replace its content with: // SPDX-License-Identifier: Unlicense pragma solidity ^0.8.0; contract BuyMeACoffee
{
event NewMemo(address indexed from, uint256 timestamp, string name, string message);
struct Memos { address from; uint256 timestamp; string name; string message; }
address payable owner; Memos[] memos;
constructor() { owner = payable(msg.sender); }
function fetchMemosDetails() public view returns (Memos[] memory) { return memos; }
function buyCoffees(string memory _name, string memory _message) public payable {
require(msg.value > 0, "can't buy coffee for free!");
memos.push(Memos(msg.sender, block.timestamp, _name, _message)); emit NewMemo(msg.sender, block.timestamp, _name, _message);
}
function withdrawTips() public {
require(owner.send(address(this).balance));
}
} Also, Read | LSDFi | Exploring Why It Is the Hottest DeFiStep 3: Testing the Contract1- Create a test script: Copy buy-coffee.js and use the following code: const hre = require("hardhat");
async function getBalance(address) {
const balanceBigInt = await hre.ethers.provider.getBalance(address);
return hre.ethers.utils.formatEther(balanceBigInt);
}
async function printBalances(addresses) {
for (const [index, address] of addresses.entries()) {
console.log(Address ${index} balance: ,
await getBalance(address));
}
}
async function printMemos(memos) {
for (const memo of memos) {
console.log(At ${memo.timestamp}, ${memo.name} (${memo.from}) said: "${memo.message}");
}
}
async function main() {
const [owner, tipper3, tipper2, tipper] = await hre.ethers.getSigners();
const BuyMeACoffee = await hre.ethers.getContractFactory("BuyMeACoffee");
const buyMeACoffee = await BuyMeACoffee.deploy(); await buyMeACoffee.deployed();
console.log("BuyMeACoffee deployed to:", buyMeACoffee.address);
const addresses = [owner.address, tipper.address, buyMeACoffee.address];
console.log("== start =="); await printBalances(addresses);
const tip = { value: hre.ethers.utils.parseEther("1") };
await buyMeACoffee.connect(tipper).buyCoffees("Carolina", "You're the best!", tip);
await buyMeACoffee.connect(tipper2).buyCoffees("Vitto", "Amazing teacher", tip);
await buyMeACoffee.connect(tipper3).buyCoffees("Kay", "I love my Proof of Knowledge", tip);
console.log("== bought coffee ==");
await printBalances(addresses);
await buyMeACoffee.connect(owner).withdrawTips();
console.log("== withdrawTips ==");
await printBalances(addresses);
console.log("== memos ==");
const memos = await buyMeACoffee.fetchMemosDetails();
printMemos(memos);
} main() .then(() => process.exit(0)) .catch((error) => {
console.error(error); process.exit(1);
}); 2- Run the script: npx hardhat run scripts/buy-coffee.jsStep 4: Deploying to Sepolia Testnet1- Create a deployment script:Create scripts/deploy.js with: const hre = require("hardhat");
async function main() {
const BuyMeACoffee = await hre.ethers.getContractFactory("BuyMeACoffee");
const buyMeACoffee = await BuyMeACoffee.deploy();
await buyMeACoffee.deployed();
console.log("BuyMeACoffee deployed to:", buyMeACoffee.address);
} main() .then(() => process.exit(0)) .catch((error) => {
console.error(error); process.exit(1);
}); 2- Configure Hardhat for Sepolia: Edit hardhat.config.js: require("@nomiclabs/hardhat-ethers");
require("@nomiclabs/hardhat-waffle");
require("dotenv").config();
const SEPOLIA_URL = process.env.SEPOLIA_URL;
const PRIVATE_KEY = process.env.PRIVATE_KEY;
module.exports = {
solidity: "0.8.4",
networks: {
sepolia: { url: SEPOLIA_URL, accounts: [PRIVATE_KEY] }
}
};3- Install dotenv: npm install dotenv4- Create a .env file: touch .env 5- Add your Alchemy and MetaMask details: SEPOLIA_URL=https://eth-sepolia.alchemyapi.io/v2/ PRIVATE_KEY=Also, Read | Identifying Smart Contract Orchestration Patterns in SolidityConclusionDeveloping a decentralized "Buy Me a Coffee" dApp using Solidity enables secure, transparent microtransactions. This blockchain-based approach ensures immutable and verifiable transactions, fostering trust and eliminating intermediaries to reduce fees and increase efficiency. It's a perfect solution for content creators and small businesses, promoting decentralized finance. Are you looking for smart contract developers? Join us in creating secure, transparent dApps and shaping the future of decentralized payment solutions. Start building today!References- Ethereum Stack Exchange- Medium
Jagveer Singh
30 May 2024
Discovering Top ERC Token Standards in 2024
The Ethereum blockchain has emerged as a fertile ground for exponential growth and innovation, particularly regarding tokens. These digital assets, powered by smart contracts, fuel various applications, from DeFi to non-fungible tokens (NFTs) and beyond. However, with a growing number of ERC (Ethereum Request for Comment) standards, understanding which one to use for your project can take time and effort.Ethereum app development services offer essential expertise for projects that wish to utilize these standards. They help navigate the complexities of token implementation, ensuring smooth integration within the broaderEthereum development services ecosystem.This blog dives into the top ERC token standards in 2024, exploring their functionalities and highlighting the use cases that make them stand out.What are ERC Token Standards?ERC Token Standardsrefer to a series of proposals from the Ethereum community aimed at enhancing the Ethereum network. Standing for "Ethereum Request for Comment," ERC standards define the rules and specifications Ethereum-based tokens must follow to ensure interoperability and compatibility across various applications and wallets.You may also like | Understanding ERC-404 | The Unofficial Token StandardNavigating the Ethereum Tokenverse: Top ERC Standards in 2024ERC-20: The Cornerstone of Fungible TokensThe ERC standards, ERC-20, established the blueprint for fungible tokens on Ethereum. Fungible tokens, like shares of a stock or utility tokens within a dApp, are interchangeable and hold equal value. ERC-20 defines a set of functions – transfer, balance inquiries, and approval – that ensure seamless interaction between tokens and wallets, exchanges, and other smart contracts.This standardization has fueled the widespread adoption of ERC-20 tokens, making them compatible with a vast ecosystem of tools and services. Popular projects like Tether (USDT), Chainlink (LINK), and Basic Attention Token (BAT) all leverage the ERC-20 standard.Discover more | ERC-20 Token Standard | Development EssentialsERC-721: Unlocking the World of NFTsERC-721 revolutionized the way digital ownership is represented. It introduced non-fungible tokens (NFTs) with unique properties and characteristics. This standard enables the creation of one-of-a-kind digital assets like artwork, collectibles, and even in-game items.The ability to verify ownership and track provenance on the blockchain has opened doors for a booming NFT market. From iconic artworks like CryptoPunks to digital sports memorabilia, ERC-721 empowers creators and collectors in a way never before possible.Also, Read | ERC-721 Non-Fungible Token Standard DevelopmentERC-1155: Embracing Flexibility with Semi-Fungible TokensERC-1155 offers a hybrid approach, catering to both fungible and non-fungible assets within a single smart contract. This standard allows creators to issue various token types – fungible tokens (like game currency) alongside non-fungible ones (like unique character upgrades) – under one umbrella.This flexibility makes ERC-1155 ideal for games, supply chain management, and other applications where managing a diverse range of digital assets is necessary. For instance, a game developer could use ERC-1155 to represent in-game currency (fungible) alongside unique character skins (non-fungible).Also, Check | ERC-1155 | An Introduction to Multi Token Standard DevelopmentERC-777: Streamlining Token TransfersERC-777 builds upon the foundation of ERC-20, aiming to improve token transfer functionality. It introduces new features like a "send" function, allowing for more efficient transfers with additional security measures. This can be particularly beneficial for scenarios where automatic token transfers occur, such as loyalty programs or subscription services.While still under development, ERC-777 presents a compelling option for projects requiring enhanced security and streamlined token transfer processes.You may also like | ERC-4337: Ethereum's Account Abstraction ProposalBeyond the Big Four: Exploring Emerging StandardsThe Ethereum token landscape constantly evolves, with new standards emerging to address specific needs. Here are a few worth keeping an eye on:ERC-1400This standard focuses on security tokens, which represent real-world assets like stocks on the blockchain and have compliance features.ERC-884Designed for identity management, ERC-884 enables the creation of self-sovereign identity tokens, empowering users to control their digital identities.ERC-223An improved version of ERC-20 that tries to prevent accidental token transfers by adding a safety mechanism. Not as commonly used as ERC-20.ERC-4626ERC-4626, also known as the Tokenized Vault Standard, is another important ERC standard to be aware of in 2024. It's specifically designed for yield-bearing vaults.Explore more | Unexplored ERC Token Standards On EthereumChoosing the Right ERC Standard for Your ProjectSelecting the most suitable ERC standard depends on the nature of your project. Here's a quick breakdown to guide your decision:Fungible tokens: ERC-20 is the clear choice for fungible tokens like utility tokens or digital currencies.Non-fungible tokens: ERC-721 is the go-to standard for creating unique digital assets like NFTs.Hybrid fungible/non-fungible assets: ERC-1155 offers flexibility for managing both types of tokens within a single contract.Security tokens: ERC-1400 provides enhanced security features for representing real-world assets on the blockchain.Also, Read | Tokenization of RWA (Real-World Assets): A Comprehensive GuideConclusionThe world of ERC token standards is dynamic, with continuous innovation shaping the future of the Ethereum token landscape. By understanding these standards' core functionalities and use cases, you'll be well-equipped to navigate this ever-evolving space and choose the right tools to power your next groundbreaking project on the Ethereum blockchain.Elevate Your Ethereum Project with Oodles BlockchainERC token standards can be complex, but Oodles Blockchain makes it simple. Using our expertEthereum development services, we simplify creating a project with ERC token standards. Our experts help you choose the right ERC standard, build secure smart contracts, navigate compliance with tokens like ERC-1400, and enhance performance using advanced standards like ERC-777. Contact ourblockchain developers today for seamless token launch solutions.
Area Of Work:
Blockchain App Development
Industry:
Software Development
Technology:
Smart Contract
,
Ethers.js
,
more
Mudit Kumar
15 Jul 2024
Building a Decentralized Voting System with Solidity and Hardhat
In this blog, we will guide you through the process of building a decentralized voting system using Solidity and Hardhat, which are heavily used in blockchain app development. You will learn how to create and deploy smart contracts that ensure secure, transparent, and tamper-proof voting. Ideal for developers looking to harness the power of blockchain technology in democratic processes, this tutorial covers everything from setting up your environment to writing and testing your contracts. With the help of this mechanism, voters will be able to safely cast their ballots on the Ethereum blockchain, guaranteeing that they cannot be manipulated.Also, Check | How To Build "Buy Me a Coffee" DeFi dApp Using SoliditySetting Up the Development Environment1. Install Node.js.2. Setup Hard Hat: Install Hardhat by running the following command in your terminal: npm install --save-dev hardhat3. Create a Hardhat Project: Initialize a new Hardhat project by running: npx hardhat
You may also like | How To Create a Daily Game Reward System in SolidityWriting the Smart Contract1. Create the Contract: Inside the contracts directory, create a new file named Voting.sol. This Solidity file will hold our voting logic.2. Implement the Contract: // SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract Voting {
struct Candidate {
uint id;
string name;
uint voteCount;
}
mapping(uint => Candidate) public candidates;
uint public candidatesCount;
mapping(address => bool) public voters;
constructor() {
addCandidate('Alice');
addCandidate('Bob');
}
function addCandidate(string memory _name) private {
candidatesCount ++;
candidates[candidatesCount] = Candidate(candidatesCount, _name, 0);
}
function vote(uint _candidateId) public {
require(!voters[msg.sender], 'You have already voted.');
require(_candidateId > 0 && _candidateId <= candidatesCount, 'Invalid candidate ID.');
voters[msg.sender] = true;
candidates[_candidateId].voteCount ++;
}
}Also, Check | How to Create a MultiSig Wallet in SolidityDeploying the Contract1. Configure Deployment Scripts:- Inside the scripts directory, create a file named deploy.js.- Add the following code to deploy the contract:
async function main() {
const Voting = await ethers.getContractFactory('Voting');
const voting = await Voting.deploy();
await voting.deployed();
console.log('Voting deployed to:', voting.address);
}
main().catch((error) => {
console.error(error);
process.exitCode = 1;
});Also, Read | Exploring Data Structures in Solidity for Advanced Smart ContractsTesting the Contract1. Write Tests:- In the test directory, create a new file for the tests.- Use Hardhat's testing framework to write tests for your contract.2. Run Tests:
npx hardhat test
Also, Explore | Identifying Smart Contract Orchestration Patterns in SolidityConclusionCongratulations! You now have a sophisticated decentralized voting system deployed on Ethereum using Solidity and Hardhat. This system lays the groundwork for numerous enhancements, such as advanced voting mechanisms, time-bound functionalities, and complex candidate structures. Imagine implementing features like weighted votes, multi-tiered elections, or secure voter verification – the possibilities are endless!Ready to take your decentralized voting system to the next level? Contact our expert Solidity developers at Oodles to transform your vision into a robust, feature-rich solution tailored to your specific needs. Let's innovate together and redefine the future of voting!
Area Of Work:
Blockchain App Development
Industry:
Software Development
Technology:
Python
,
Java
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more
Ashish Gushain
17 Jul 2024
Why Prefer Tron Platform for Token Development
TRON should be the preferred choice for those wishing their token development on a cutting-edge public blockchain platform. Now, it is providing Ethereum, EOS, and other blockchain alternatives considerable competition. Due to this, in the last year or two, demand for skilled TRON Development has skyrocketed. TRON is a public blockchain network offering a better alternative to blockchains like Ethereum for token development. It is a less expensive and more effective option. Since it is a distinct blockchain network, it has its protocols, resources, and features. It enables businesses and programmers for highly-efficient decentralized apps (DApps) and token development on the TRON network. Indeed, one of the hottest topics in the cryptocurrency industry right now is TRON-based blockchain app development. However, some elements are severely restricting developers' ability to understand the potential of this cutting-edge blockchain system. These elements include the lack of knowledge and tools for developers to learn how to build on the TRON blockchain. But if you work with a blockchain development company like Oodles, you can boost the development of your next-generation TRON.Understanding TRC-10The TRON team made the TRC-10 token first available on the TRON mainnet in 2018. Due to the low cost and ease of creation, people use TRC-10 tokens as a payment method in decentralized applications (dApps). TRC-10 tokens also aid in the development of blockchain-based assets. They don't require support from the TRON Virtual Machine. The team may create them using an API or smart contract. Thus, developers don't need to be familiar with programming languages to make a TRC-10 token. By spending 1,024 TRX, any account on the TRON network can produce a TRC-10 token. Except for the bandwidth used to transfer them, they are usually free to use after that. Before producing a TRC-10 token, users must provide specific details such as the token's name, market value, conversion rate to TRX, period of circulation, number of bandwidth points used, and stake. Also, Read | A Quick Guide to Ethereum ERC Token StandardsUnderstanding TRC-20TRON blockchain enables the TRC-20 standard usage to incorporate native TRON coins into smart contracts. The TRON Virtual Machine, which serves as the platform for TRON smart contracts, enables the creation of TRC-20 tokens. The ERC-20 standard for generating fungible tokens on the Ethereum network is compatible with TRC-20. TRC-20 coins are fungible, much as TRC-10 tokens, which means users may trade them for other assets of the same kind. Developers may incorporate more logic into their smart contracts. So, one can view TRC-20 as a better or enhanced version of TRC-10 in some ways. However, issuers need to be mindful of the expenses. According to the whitepaper for TRON, the transaction costs for TRC-10 tokens are 1,000 times cheaper than those for TRC-20.Also, Check | The Complete Guide to TRC-20 Token DevelopmentUnderstanding TRC-721The TRC-721 set of guidelines governs the issuance of non-fungible tokens (NFTs) on the TRON network. A non-fungible token is cryptographically distinct. In contrast to fungible tokens, they have a unique identifier, and you cannot exchange them for an identical item. You can tokenize any real-world item, such as works of art, music, clothing, or real estate, with TRC-721. Developers can also use it to make NFTs that depict digital assets like sports highlights, GIFs, or in-game avatars. Each TRC-721 coin has a blockchain address that identifies its owner and serves as proof of ownership. Also, Read |Real Estate Tokenization and Blockchain | An In-depth GuideFeatures & Benefits of Token Development on TRON The TRON blockchain can help to develop various blockchain applications, including wallets, DApps, tokens, and more. Tokens based on TRON are state-of-the-art. The team uses the most recent blockchain technology (TRC20/TRC10) to construct them. They are middleman-free and safe. Also, they handle transactions quickly. TRON wallets are simple to create and fit into any existing system. The UI of TRON tokens/wallets is customizable, so they make the update of the software simpler. They support Android, iOS, Windows, and other well-known platforms. Some additional features of TRON Blockchain Development are a P2P decentralized network, token swaps, data, global access, multi-token support, public ledger storage, cost-effectiveness, and high-end security. Also, Read | Understanding the Types of Crypto Tokens and Their BenefitsBuilding a Token on the TRON Blockchain has various Advantages, includingOn the peer-to-peer decentralized blockchain, payments are safe and quick.Users and holders of TRON tokens have unrestricted access to data.In the event of a disagreement, all transactions are visible, immutable, and simple to monitor.Since there are chances of zero human error, it results in better accuracy.The network is capable of 2000 transactions per second or perhaps more.Your TRON token can manage a rising workload thanks to its excellent scalability.TRON network has a relatively low gas charge compared to ETH and other blockchain networks resulting in a lower transaction cost.Also, Read | A Guide to Defi Token Development Like SafemoonWhat's NextBusiness organizations may now easily modify this token technology. One of the service providers that enables you to use these tokens for your company's operations is Oodles. Our skilled blockchain developers make it simple for you. Our mission is to use technology to empower your business idea. Get in touch with us to build these tokens for your business.
Area Of Work:
Blockchain App Development
,
Crypto/Token Development
Industry:
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Mudit Kumar
11 Oct 2022
The Boons of Building on Cardano Blockchain
The race to challenge Ethereum's hegemony is on, and the Cardano blockchain might be among the favorites. What advantages does the blockchain with a distinct blockchain development strategy provide, though? We will delve into Cardano, the smart contract platform, in this blog post.Understanding Cardano BlockchainConsider Bitcoin as a first-generation blockchain with simply transactional use cases and Ethereum as a second-generation blockchain that popularised the idea of smart contracts and the existence of blockchains as an ecosystem. According to Ethereum's founder Vitalik Buterin, both first-generation and second-generation blockchains, such as Bitcoin and Ethereum, experience the "blockchain trilemma." It explains the trade-off that blockchain developers must make to address the three key challenges of decentralization, security, and scalability. Cardano, a third-generation blockchain, aspires to scale without sacrificing security or decentralization. Charles Hoskinson, who founded the network, departed Ethereum in 2014 due to differences in the development of the blockchain platform for smart contracts. He introduced Cardano in 2017 to outperform Bitcoin and Ethereum. Cardano adopts a distinct peer review methodology. Academics review and approve any alterations to the network or future advances before they are implemented, including the Ouroboros consensus process. Also, Check | Why Develop a Blockchain-based Freelance PlatformThe Consensus Mechanism of Cardano BlockchainWhile Ethereum and, up until recently, Bitcoin were founded on the proof-of-work consensus algorithm, Cardano has created Ouroboros, a proof-of-stake alternative. There is no longer a "race" to create a new block thanks to this procedure: To have the opportunity to mine for brand-new blocks, the network chooses slot leaders (nodes) at random. Epochs are the slots into which the blockchain is divided. For rewards, slot leaders can mine entire epochs or portions of epochs. Epochs can be divided indefinitely, which is why Cardano asserts that it is theoretically infinitely scalable. The main advantage of Ouroboros is that it provides a verifiable method for choosing validators at random to produce an additional share of security. Additionally, the randomness might make it impossible for patterns to emerge that would protect the network from attacks. Also, Explore | Developing a Ride-Sharing App like Uber with BlockchainAdvantages of Cardano BlockchainWeb 3.0 Development Cardano was created with integration with Web 3.0 in mind. Cardano may be used to create metaverses, and the blockchain will be particularly beneficial if you want to combine your business with the Internet of Things or IoT technologies. This has been done since it is anticipated that all of these Web 3.0 characteristics will expand quickly and benefit businesses in a variety of ways. The integration of Cardano is carried out with the assistance of blockchain engineers experienced in such services. Given how quickly the IT market changes, it is also crucial to hire such blockchain developers who can offer upgrade and maintenance services in the future. You may also like | Chatgpt and Web3 Integration | Exploring New OpportunitiesAdaptable and SturdyThe blockchain is equipped to manage difficult projects and innovative start-up ideas. The blockchain's several tiers enable low transaction costs and quick speeds while also preventing network congestion. This implies that it is incredibly trustworthy even when the market swings, which is seen by investors all around the world as a positive indicator.Also, Explore | Cardano Ouroboros: A Tailored Approach to Proof-of-StakeNFT Trade AssistanceCustom NFT tokens can be created and traded using Cardano. A custom NFT marketplace that charges for NFT trading can likewise be hosted on the blockchain. This implies that, once the need arises, NFT fans can be drawn via the blockchain. Its collection of attributes, including verifiability, auditing, and client testing capabilities, make it the ideal choice for anything involving NFTs. Also, Visit | NFT Marketplace DevelopmentReviewed by PeersCardano has been endorsed by experts from all around the world and has strong research backing, unlike other blockchain ventures that merely have a white paper as their initial step. This might be a result of the Cardano cryptocurrency being founded by Charles Hoskinson, an Ethereum co-founder. The properties of Cardano have also been confirmed by leading computer experts from around the world.High SecurityCardano uses a proprietary Proof-of-Stake consensus algorithm called Ouroboros to handle the transaction validation process. The development procedures used by Cardano guarantee complete security and lightning-fast transaction processing. With the Proof-of-Stake consensus method, Delegated Staking is possible, enabling your clients to participate in the validation process without needing the technical know-how to run a node. Connect with our blockchain developers to get started with Cardano blockchain development or any assistance or consultation related to dApps development.
Area Of Work:
Blockchain App Development
Industry:
Software Development
Technology:
Rust
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No SQL/Mongo DB
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Mudit Kumar
29 Jun 2023
