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BLOCKCHAIN_INTEGRATION.md
Version: 1.0 Project: CeloHT Blockchain: Celo Primary Assets: CELO and cUSD
This document defines how CeloHT applications interact with the Celo blockchain.
The integration architecture separates wallet interactions, blockchain RPC communication, smart contracts, transaction monitoring, and application services.
CeloHT User
│
▼
CeloHT Application
│
▼
Wallet Layer
│
▼
Signed Transaction
│
▼
Celo Network
│
┌────────────┼────────────┐
▼ ▼ ▼
CELO cUSD Contracts
│ │ │
└────────────┼────────────┘
▼
Blockchain
│
▼
Events / Receipts
│
▼
CeloHT Services
Celo provides the blockchain infrastructure used by CeloHT.
CeloHT applications should explicitly identify:
- Network
- Chain ID
- RPC endpoint
- Contract addresses
- Asset addresses where applicable
These values should be environment-specific.
Wallets authorize transactions.
Application
│
▼
Connect Wallet
│
▼
Wallet Address
│
▼
Prepare Transaction
│
▼
User Approval
│
▼
Signature
│
▼
Broadcast
CeloHT applications must never request private keys or seed phrases.
CELO may be used for:
- Network transaction fees
- Blockchain interactions
- Ecosystem transactions where appropriate
The application should clearly distinguish CELO from stable-value assets.
cUSD may be used for:
- Payments
- Transfers
- Community financial services
- Other supported ecosystem transactions
The application should always verify the correct network and asset configuration.
Transaction Created
│
▼
Transaction Signed
│
▼
Transaction Broadcast
│
▼
Pending
│
▼
Confirmed
│
▼
Application Updated
A transaction should not be marked successful solely because it was submitted.
The application should verify:
- Transaction hash
- Network
- Receipt
- Status
- Relevant contract events
- Expected recipient
- Expected asset
- Expected amount
Applications should interact with contracts through well-defined interfaces.
Frontend
│
▼
Blockchain Service
│
▼
Contract Interface / ABI
│
▼
Wallet
│
▼
Celo
Contract addresses should be centrally configured rather than duplicated throughout the codebase.
CeloHT should maintain a public registry containing:
Contract Name
Network
Address
Version
Deployment Date
Verification Status
Repository
This reduces confusion between development, test, and production contracts.
Blockchain requests may pass through RPC infrastructure.
CeloHT Application
│
▼
Blockchain Service
│
▼
RPC Provider
│
▼
Celo Network
Applications should handle:
- RPC errors
- Timeouts
- Rate limits
- Temporary outages
Where justified, applications may support multiple RPC providers.
Blockchain Service
│
┌───────┴───────┐
▼ ▼
RPC A RPC B
│ │
└───────┬───────┘
▼
Celo
Failover must not introduce inconsistent network configuration.
Important contract events can be monitored.
Smart Contract
│
▼
Blockchain Event
│
▼
Indexer / Listener
│
▼
Application Database
│
▼
Dashboard
Before executing blockchain operations, applications should validate addresses.
Validation should include:
- Correct format
- Correct network
- Expected contract address where applicable
User-supplied addresses must not automatically be trusted.
Applications should validate:
- Positive amounts
- Decimal precision
- Minimum values
- Maximum values
- Available balance
- Transaction fee requirements
Financial calculations should avoid unsafe floating-point arithmetic.
Transactions require network fees.
The application should provide users with understandable transaction-fee information where practical.
The system should not assume that users always have sufficient CELO for fees.
A failed transaction should produce a clear application state.
Transaction
│
├── Success
│
├── Pending
│
└── Failed
│
▼
User Feedback
Failed transactions should not be treated as successful application actions.
For blockchain transactions:
The blockchain is authoritative.
Application databases may cache or index blockchain information, but they should not override confirmed blockchain state.
Blockchain integrations should protect against:
- Wrong network
- Wrong contract
- Malicious contract address
- Transaction replay where applicable
- Unauthorized signing
- Incorrect amounts
- Phishing
- RPC manipulation
- Frontend compromise
Before production deployment:
Local
│
▼
Test Environment
│
▼
Celo Testnet
│
▼
Integration Testing
│
▼
Production
The exact test network should be documented in each repository.
- Correct Celo network
- Correct chain ID
- Contract addresses verified
- Wallet flow tested
- Transaction monitoring tested
- Error handling implemented
- RPC failure handling implemented
- Events tested
- Production configuration reviewed
Document: Blockchain Integration Version: 1.0 Blockchain: Celo Primary Assets: CELO / cUSD
© 2026 CeloHT - Open Source. Global Impact. Licensed under Apache.