flow-hackquest
Welcome to the **Counter Smart Contract** - a minimalist yet educational decentralized application deployed on the **Flow EVM Testnet**. This project demonstrates the fundamental concepts of blockchai
説明
# Counter Smart Contract 🔢
## 🚀 Introduction
Welcome to the **Counter Smart Contract** - a minimalist yet educational decentralized application deployed on the **Flow EVM Testnet**. This project demonstrates the fundamental concepts of blockchain development, smart contract interaction, and state management in a simple, easy-to-understand format.
### Why This Project?
This Counter dApp serves as an excellent starting point for developers looking to:
- 🎓 **Learn Solidity** fundamentals and best practices
- 🌊 **Explore Flow EVM** and its Ethereum-compatible features
- 🔧 **Understand smart contract deployment** and interaction patterns
- 💡 **Build foundational knowledge** for more complex blockchain applications
Whether you're a beginner taking your first steps into Web3 development or an experienced developer exploring the Flow ecosystem, this project provides a clean, well-documented foundation to build upon.
### What Makes It Special?
- **Production-Ready**: Successfully deployed and verified on Flow EVM Testnet
- **Gas-Optimized**: Efficient implementation with minimal gas costs
- **Educational**: Clean code with comprehensive documentation
- **Open Source**: MIT licensed and available for learning and modification
- **Flow-Powered**: Leverages Flow's high-performance blockchain infrastructure
## 📋 Project Overview
The Counter smart contract is a minimalist decentralized application that allows users to:
- **Increment** the counter value
- **Decrement** the counter value
- **Query** the current counter value
This project serves as a foundational example for understanding smart contract development, deployment, and interaction on the Flow blockchain.
## 🌊 Built on Flow EVM Testnet
Flow EVM provides Ethereum compatibility on Flow's high-performance blockchain, offering:
- Low transaction costs
- Fast finality
- EVM compatibility
- Scalable infrastructure
### Deployment Details
| Property | Value |
|----------|-------|
| **Contract Address** | `0x6a5b6a369CeB346F7cC602a327353Bc1B470225F` |
| **Network** | Flow EVM Testnet |
| **Transaction Hash** | `0x062f24cd490123845c1596a95d73d2323de053892a9eb121eb926537ee7f8d34` |
| **Block Number** | 74315522 |
| **Deployer Address** | `0x4B1d0a004038086F2d18E59DC3e56E7b9C19614a` |
| **Gas Used** | 150,987 gas |
| **Deployment Status** | ✅ Successful |
## 🛠️ Tech Stack
### Smart Contract
- **Solidity** `^0.8.0` - Smart contract programming language
- **MIT License** - Open source licensing
### Blockchain
- **Flow EVM Testnet** - Deployment network
- **EVM Compatible** - Ethereum Virtual Machine support
### Development Tools
- **Remix IDE** - Smart contract development and deployment
- **MetaMask** - Wallet integration and transaction signing
- **Flow EVM RPC** - Network connection
## 📦 Contract Features
### Functions
#### `increment()`
- **Type:** Public
- **Description:** Increases the counter value by 1
- **Gas Cost:** ~26,000 gas (approx.)
#### `decrement()`
- **Type:** Public
- **Description:** Decreases the counter value by 1
- **Gas Cost:** ~26,000 gas (approx.)
#### `getCount()`
- **Type:** Public View
- **Returns:** `int256` - Current counter value
- **Description:** Retrieves the current counter value
- **Gas Cost:** Free (read-only)
## 🚀 Getting Started
### Prerequisites
- MetaMask wallet configured for Flow EVM Testnet
- Test FLOW tokens for gas fees
### Flow EVM Testnet Configuration
Add the following network to your MetaMask:
```
Network Name: Flow EVM Testnet
RPC URL: https://testnet.evm.nodes.onflow.org
Chain ID: 545
Currency Symbol: FLOW
Block Explorer: https://evm-testnet.flowscan.io
```
### Interacting with the Contract
You can interact with the deployed contract using:
1. **Remix IDE**
- Load the contract at the deployed address
- Connect to Flow EVM Testnet
- Call functions through the UI
2. **Web3.js/Ethers.js**
```javascript
const contractAddress = "0x6a5b6a369CeB346F7cC602a327353Bc1B470225F";
const abi = [...]; // Contract ABI
const contract = new ethers.Contract(contractAddress, abi, signer);
// Increment counter
await contract.increment();
// Get current count
const count = await contract.getCount();
console.log("Current count:", count.toString());
```
3. **Block Explorer**
- Visit: [Flow EVM Testnet Explorer](https://evm-testnet.flowscan.io)
- Search for contract: `0x6a5b6a369CeB346F7cC602a327353Bc1B470225F`
## 📊 Project Structure
```
flow/
│
├── counter.sol # Smart contract source code
└── readme.md # Project documentation
```
## 🔐 Security Considerations
- ✅ Uses Solidity `^0.8.0` with built-in overflow protection
- ✅ Simple, auditable codebase
- ✅ No external dependencies
- ⚠️ No access control implemented (anyone can modify counter)
## 📈 Future Improvements
### Short-term Enhancements
- [ ] **Access Control**: Implement Ownable pattern to restrict who can modify the counter
- [ ] **Events**: Add event emissions for increment/decrement actions for better tracking
- [ ] **Reset Function**: Add ability to reset counter to zero
- [ ] **Set Function**: Allow setting counter to a specific value
- [ ] **Frontend**: Build a React/Next.js web interface for easier interaction
### Medium-term Goals
- [ ] **Multi-Counter**: Support multiple named counters in a single contract
- [ ] **Counter History**: Store historical counter values with timestamps
- [ ] **Limits**: Add configurable min/max bounds for the counter
- [ ] **Batch Operations**: Allow incrementing/decrementing by custom amounts
- [ ] **Unit Tests**: Add comprehensive test suite using Hardhat/Foundry
### Long-term Vision
- [ ] **Governance**: Implement DAO-style voting for counter modifications
- [ ] **NFT Integration**: Mint NFTs at milestone counter values
- [ ] **Cross-chain**: Deploy to multiple EVM chains
- [ ] **Analytics Dashboard**: Build comprehensive usage analytics
- [ ] **Gas Optimization**: Further optimize contract for lower gas costs
## 📝 License
This project is licensed under the MIT License - see the LICENSE file for details.
## 🤝 Contributing
Contributions are welcome! Feel free to:
- Open issues for bugs or suggestions
- Submit pull requests with improvements
- Share feedback and ideas
## 🔗 Useful Links
- [Flow Documentation](https://developers.flow.com/)
- [Flow EVM Documentation](https://developers.flow.com/evm/about)
- [Solidity Documentation](https://docs.soliditylang.org/)
- [Flow Discord Community](https://discord.gg/flow)
## 👨💻 Developer
Developed and deployed by: `0x4B1d0a004038086F2d18E59DC3e56E7b9C19614a`
---
**⭐ If you find this project useful, please consider giving it a star!**
*Built with ❤️ on Flow EVM Testnet*
ハッカソンの進行状況
markdown # Counter Smart Contract 🔢  ## 🚀 Introduction Welcome to the **Counter Smart Contract** - a minimalist yet educational decentralized application deployed on the **Flow EVM Testnet**. This project demonstrates the fundamental concepts of blockchain development, smart contract interaction, and state management in a simple, easy-to-understand format. ### Why This Project? This Counter dApp serves as an excellent starting point for developers looking to: - 🎓 **Learn Solidity** fundamentals and best practices - 🌊 **Explore Flow EVM** and its Ethereum-compatible features - 🔧 **Understand smart contract deployment** and interaction patterns - 💡 **Build foundational knowledge** for more complex blockchain applications Whether you're a beginner taking your first steps into Web3 development or an experienced developer exploring the Flow ecosystem, this project provides a clean, well-documented foundation to build upon. ### What Makes It Special? - **Production-Ready**: Successfully deployed and verified on Flow EVM Testnet - **Gas-Optimized**: Efficient implementation with minimal gas costs - **Educational**: Clean code with comprehensive documentation - **Open Source**: MIT licensed and available for learning and modification - **Flow-Powered**: Leverages Flow's high-performance blockchain infrastructure ## 📋 Project Overview The Counter smart contract is a minimalist decentralized application that allows users to: - **Increment** the counter value - **Decrement** the counter value - **Query** the current counter value This project serves as a foundational example for understanding smart contract development, deployment, and interaction on the Flow blockchain. ## 🌊 Built on Flow EVM Testnet Flow EVM provides Ethereum compatibility on Flow's high-performance blockchain, offering: - Low transaction costs - Fast finality - EVM compatibility - Scalable infrastructure ### Deployment Details | Property | Value | |----------|-------| | **Contract Address** | `0x6a5b6a369CeB346F7cC602a327353Bc1B470225F` | | **Network** | Flow EVM Testnet | | **Transaction Hash** | `0x062f24cd490123845c1596a95d73d2323de053892a9eb121eb926537ee7f8d34` | | **Block Number** | 74315522 | | **Deployer Address** | `0x4B1d0a004038086F2d18E59DC3e56E7b9C19614a` | | **Gas Used** | 150,987 gas | | **Deployment Status** | ✅ Successful |  ## 🛠️ Tech Stack ### Smart Contract - **Solidity** `^0.8.0` - Smart contract programming language - **MIT License** - Open source licensing ### Blockchain - **Flow EVM Testnet** - Deployment network - **EVM Compatible** - Ethereum Virtual Machine support ### Development Tools - **Remix IDE** - Smart contract development and deployment - **MetaMask** - Wallet integration and transaction signing - **Flow EVM RPC** - Network connection ## 📦 Contract Features ### Functions #### `increment()` - **Type:** Public - **Description:** Increases the counter value by 1 - **Gas Cost:** ~26,000 gas (approx.) #### `decrement()` - **Type:** Public - **Description:** Decreases the counter value by 1 - **Gas Cost:** ~26,000 gas (approx.) #### `getCount()` - **Type:** Public View - **Returns:** `int256` - Current counter value - **Description:** Retrieves the current counter value - **Gas Cost:** Free (read-only) ## 🚀 Getting Started ### Prerequisites - MetaMask wallet configured for Flow EVM Testnet - Test FLOW tokens for gas fees ### Flow EVM Testnet Configuration Add the following network to your MetaMask: ``` Network Name: Flow EVM Testnet RPC URL: https://testnet.evm.nodes.onflow.org Chain ID: 545 Currency Symbol: FLOW Block Explorer: https://evm-testnet.flowscan.io ``` ### Interacting with the Contract You can interact with the deployed contract using: 1. **Remix IDE** - Load the contract at the deployed address - Connect to Flow EVM Testnet - Call functions through the UI 2. **Web3.js/Ethers.js** ```javascript const contractAddress = "0x6a5b6a369CeB346F7cC602a327353Bc1B470225F"; const abi = [...]; // Contract ABI const contract = new ethers.Contract(contractAddress, abi, signer); // Increment counter await contract.increment(); // Get current count const count = await contract.getCount(); console.log("Current count:", count.toString()); ``` 3. **Block Explorer** - Visit: [Flow EVM Testnet Explorer](https://evm-testnet.flowscan.io) - Search for contract: `0x6a5b6a369CeB346F7cC602a327353Bc1B470225F` ## 📊 Project Structure ``` flow/ │ ├── counter.sol # Smart contract source code └── readme.md # Project documentation ``` ## 🔐 Security Considerations - ✅ Uses Solidity `^0.8.0` with built-in overflow protection - ✅ Simple, auditable codebase - ✅ No external dependencies - ⚠️ No access control implemented (anyone can modify counter) ## 📈 Future Improvements ### Short-term Enhancements - [ ] **Access Control**: Implement Ownable pattern to restrict who can modify the counter - [ ] **Events**: Add event emissions for increment/decrement actions for better tracking - [ ] **Reset Function**: Add ability to reset counter to zero - [ ] **Set Function**: Allow setting counter to a specific value - [ ] **Frontend**: Build a React/Next.js web interface for easier interaction ### Medium-term Goals - [ ] **Multi-Counter**: Support multiple named counters in a single contract - [ ] **Counter History**: Store historical counter values with timestamps - [ ] **Limits**: Add configurable min/max bounds for the counter - [ ] **Batch Operations**: Allow incrementing/decrementing by custom amounts - [ ] **Unit Tests**: Add comprehensive test suite using Hardhat/Foundry ### Long-term Vision - [ ] **Governance**: Implement DAO-style voting for counter modifications - [ ] **NFT Integration**: Mint NFTs at milestone counter values - [ ] **Cross-chain**: Deploy to multiple EVM chains - [ ] **Analytics Dashboard**: Build comprehensive usage analytics - [ ] **Gas Optimization**: Further optimize contract for lower gas costs ## 📝 License This project is licensed under the MIT License - see the LICENSE file for details. ## 🤝 Contributing Contributions are welcome! Feel free to: - Open issues for bugs or suggestions - Submit pull requests with improvements - Share feedback and ideas ## 🔗 Useful Links - [Flow Documentation](https://developers.flow.com/) - [Flow EVM Documentation](https://developers.flow.com/evm/about) - [Solidity Documentation](https://docs.soliditylang.org/) - [Flow Discord Community](https://discord.gg/flow) ## 👨💻 Developer Developed and deployed by: `0x4B1d0a004038086F2d18E59DC3e56E7b9C19614a` --- **⭐ If you find this project useful, please consider giving it a star!** *Built with ❤️ on Flow EVM Testnet*