[Plan] 🎯 Advanced Random Airdrop System with Chainlink VRF & Automation

Documentation

A comprehensive Solidity project that combines Chainlink VRF (Verifiable Random Function) and Chainlink Automation to create a fully automated, fair, and transparent airdrop distribution system.

🌟 What Makes This Project Special

This isn't just another airdrop contract. It's a complete automated ecosystem that demonstrates advanced smart contract patterns, Chainlink integrations, and real-world deployment strategies.

• Fully Automated: No manual intervention required after setup
• Provably Fair: Uses Chainlink VRF for verifiable randomness

🎓 Learning Objectives

🔗 Chainlink VRF Integration

• Requesting and handling verifiable random numbers
• Managing VRF subscriptions and LINK payments
• Implementing callback functions with proper error handling
• Working with request IDs and async responses

🤖 Chainlink Automation (Keepers)

• Setting up automated time-based triggers
• Implementing checkUpkeep and performUpkeep functions
• Managing contract state transitions automatically
• Handling complex automation logic

🏗️ Advanced Smart Contract Patterns

• Custom Errors: Gas-efficient error handling
• Events: Comprehensive logging and monitoring
• Enums: Clean state management
• Modifiers: Access control and validation
• CEI Pattern: Checks-Effects-Interactions security

🧪 Professional Testing & Deployment

• Unit tests with Foundry
• Integration tests with forked networks
• Fuzz testing for edge cases
• Mock contracts for local development
• Deployment scripts for multiple networks
• Gas optimization techniques

🧪 Testing Strategy

Unit Tests

forge test --match-test testRegistration
forge test --match-test testVRFCallback
forge test --match-test testAutomation

Integration Tests

forge test --fork-url $SEPOLIA_RPC_URL

Fuzz Tests

forge test --match-test testFuzz_MultipleRegistrations

Gas Analysis

forge test --gas-report

🚀 Deployment & Interaction

Local Development

# Start local blockchain
anvil

# Deploy to local
forge script script/DeployAirdrop.s.sol --rpc-url http://localhost:8545 --broadcast

Testnet Deployment

# Deploy to Sepolia
make deploy ARGS="--network sepolia"

# Verify contract
make verify ARGS="--network sepolia"

Interaction Scripts

# Register for airdrop
cast send $CONTRACT_ADDRESS "registerForAirdrop()" --private-key $PRIVATE_KEY

# Check registration status
cast call $CONTRACT_ADDRESS "isRegistered(address)" $YOUR_ADDRESS

📚 Dependencies

This project uses the following libraries:

• Chainlink contracts for VRF (Verifiable Random Function) and Automation
• OpenZeppelin contracts for security and utility functions
• Forge Standard Library for testing

Installing Dependencies

To install all required libraries with Foundry, run:

# Install all dependencies at once
forge install

# Or install each dependency individually
forge install smartcontractkit/chainlink-brownie-contracts --no-commit
forge install foundry-rs/forge-std --no-commit
forge install OpenZeppelin/openzeppelin-contracts --no-commit

Note: The --no-commit flag prevents Foundry from committing the changes to your repository.

🎯 Project Milestones

Week 1: Foundation

• Project setup and basic contract structure
• Registration system implementation
• Basic VRF integration
• Initial testing framework

Week 1: Automation

• Chainlink Automation integration
• Automated phase transitions
• Winner selection logic
• Integration testing

Week 2: Advanced Features

• Multi-tier prize system (optional)
• Weighted selection algorithm (optional)
• Anti-Sybil protection
• Gas optimization

Week 2: Production Ready

• Comprehensive testing
• Deployment scripts
• Documentation
• Security review

🏆 Success Metrics

By the end of this project, you'll have:

• ✅ A fully functional automated airdrop system
• ✅ Deep understanding of Chainlink VRF and Automation
• ✅ Professional-grade testing and deployment skills
• ✅ Gas-optimized and secure smart contracts
• ✅ Real-world deployment experience