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Developer Guide: Smart Contract & Backend Responsibilities

Overview​

This document outlines the specific responsibilities and features for smart contract and backend developers working on the ChainMove platform. It provides a clear separation of concerns and visual representations of the features each team will implement.

Smart Contract Developer Responsibilities​

Core Features​

  1. Vehicle NFT Management

    • Implement ERC-721 compatible Vehicle NFTs
    • Handle vehicle ownership transfers
    • Manage vehicle metadata on-chain

  2. Investment Pool Contracts

    • Create and manage investment pools
    • Handle investor contributions
    • Distribute returns to investors

  3. Revenue Sharing

    • Implement revenue distribution logic
    • Handle profit sharing between investors and platform
    • Manage payment schedules

  4. Governance

    • Implement voting mechanisms
    • Handle proposal creation and execution
    • Manage protocol parameters

Feature Diagram: Smart Contract Features​

Smart Contract Developer Tasks​

  1. VehicleNFT Contract

    • Implement mint(): Create new vehicle NFTs
    • Implement transfer(): Handle ownership transfers
    • Implement setTokenURI(): Update vehicle metadata
    • Events: Transfer, Mint, MetadataUpdate

  2. InvestmentPool Contract

    • Implement createPool(): Initialize new investment opportunities
    • Implement invest(): Handle investor contributions
    • Implement withdraw(): Process investor withdrawals
    • Events: PoolCreated, Invested, Withdrawn

  3. RevenueSharing Contract

    • Implement recordPayment(): Track revenue from vehicles
    • Implement distribute(): Allocate revenue to investors
    • Implement claimEarnings(): Allow investors to claim returns
    • Events: PaymentRecorded, RevenueDistributed, EarningsClaimed

Backend Developer Responsibilities​

Core Features​

  1. API Development

    • RESTful API endpoints
    • WebSocket for real-time updates
    • Authentication & Authorization

  2. Database Management

    • Schema design and migrations
    • Data validation and sanitization
    • Query optimization

  3. Blockchain Integration

    • Smart contract interaction
    • Event listening and processing
    • Transaction management

  4. Off-chain Services

    • File storage (IPFS, S3)
    • Email notifications
    • Background jobs

Feature Diagram: Backend Features​

Backend Developer Tasks​

  1. API Endpoints

    • User authentication and profile management
    • Vehicle listing and search
    • Investment operations
    • Transaction history

  2. Database Models

    • Users and authentication
    • Vehicle listings and details
    • Investment records
    • Transaction history

  3. Blockchain Services

    • Contract deployment helpers
    • Event listeners
    • Transaction queue management

Feature Implementation Mapping​

Developer Workflow​

Responsibility Matrix​

FeatureSmart Contract DeveloperBackend Developer
User Management- Wallet connectionUser authentication
Signature verificationSession management
On-chain identityOff-chain profile
Vehicle ListingNFT mintingMetadata storage
Ownership transferSearch & filtering
On-chain verificationImage hosting
InvestmentPool creationPayment processing
Token transfersInvestment records
Yield calculationTransaction history
RevenueDistribution logicPayout processing
Profit sharingEmail notifications
Claim verificationReceipt generation
GovernanceVoting mechanismProposal management
Proposal executionVoter analytics
Parameter updatesUI integration

System Integration​

  1. Smart Contract Events

    • Backend listens for on-chain events
    • Updates database accordingly
    • Triggers notifications

  2. API to Smart Contract

    • Backend signs and sends transactions
    • Handles gas estimation
    • Manages transaction nonces

  3. Data Consistency

    • Off-chain data mirrors on-chain state
    • Regular reconciliation
    • Conflict resolution

Development Workflow​

  1. Smart Contract Development

    • Write and test contracts locally
    • Deploy to testnet
    • Verify on block explorer

  2. Backend Development

    • Implement API endpoints
    • Set up database models
    • Integrate with smart contracts

  3. Testing

    • Unit tests for contracts and backend
    • Integration tests
    • End-to-end tests

  4. Deployment

    • Deploy smart contracts
    • Deploy backend services
    • Configure monitoring

Best Practices​

Smart Contracts​

  • Follow Solidity style guide
  • Implement access control
  • Use OpenZeppelin contracts
  • Comprehensive test coverage
  • Gas optimization

Backend​

  • RESTful API design
  • Input validation
  • Error handling
  • Logging and monitoring
  • Security best practices

Troubleshooting​

Common Issues​

  1. Transaction Failures

    • Check gas limits
    • Verify contract addresses
    • Check for revert reasons

  2. Event Not Captured

    • Verify event signatures
    • Check block range
    • Confirm listener is running

  3. API Timeouts

    • Check blockchain node connection
    • Review query performance
    • Check for rate limiting

Support​

For issues not covered in this guide, please refer to: