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SYSTEM_DESIGN.md
Document Type: System Architecture & Design Specification Project: CeloHT Status: Active / Evolving Last Updated: August 2026 Authors: Johnny Dubic & CeloHT Community
CeloHT is designed as a community-oriented Web3 ecosystem focused on financial inclusion, education, decentralized access, and environmental impact.
The system combines:
- Web applications
- Blockchain infrastructure
- Digital wallets
- Community agents
- Educational systems
- Environmental programs
- APIs and backend services
- Open-source documentation
The architecture is intended to remain modular so individual components can evolve without unnecessarily disrupting the broader ecosystem.
The CeloHT system should prioritize:
- Security
- Reliability
- Transparency
- Usability
- Maintainability
- Scalability
- Interoperability
- Community participation
Components should have clear responsibilities and interfaces.
User interfaces, business logic, blockchain interaction, and infrastructure should remain appropriately separated.
Security requirements should be considered from the beginning of development.
Where practical, CeloHT should use established standards and interoperable technologies.
Important operational events should be measurable and monitorable.
CeloHT Ecosystem
│
┌─────────────────┼─────────────────┐
│ │ │
▼ ▼ ▼
User Applications Education Community Programs
│ │ │
└─────────────────┼─────────────────┘
│
▼
Application Layer
│
┌───────────┼───────────┐
│ │ │
▼ ▼ ▼
APIs Services Data Layer
│ │ │
└───────────┼───────────┘
│
┌───────────────┴───────────────┐
│ │
▼ ▼
Blockchain Layer External Services
│
▼
Celo Network
│
┌─────┴─────┐
▼ ▼
CELO cUSD
The architecture can be divided into:
- Presentation Layer
- Application Layer
- Service Layer
- Data Layer
- Blockchain Layer
- Integration Layer
- Infrastructure Layer
The presentation layer provides interfaces for users and contributors.
Possible interfaces include:
- CeloHT website
- Web applications
- Dashboards
- Educational interfaces
- Agent interfaces
- Community interfaces
The presentation layer should avoid embedding sensitive business logic that must be enforced server-side or on-chain.
The application layer coordinates user actions and system functionality.
Responsibilities may include:
- Authentication
- User sessions
- Application workflows
- Form handling
- Business rules
- API communication
- Blockchain transaction preparation
Services provide reusable system capabilities.
Examples include:
- User management
- Education services
- Agent services
- Transaction services
- Notification services
- Analytics
- Environmental program tracking
Services should have clear interfaces.
The data layer stores information that does not need to exist on-chain.
Possible data includes:
- User profiles
- Educational content
- Course progress
- Program records
- Agent information
- Application configuration
- Analytics data
Sensitive information should be minimized and protected.
The blockchain layer provides decentralized transaction infrastructure.
CeloHT may interact with:
- Celo network
- CELO
- cUSD
- Smart contracts
- Blockchain RPC providers
- Blockchain explorers
The blockchain should not be treated as a general-purpose database for information that does not require on-chain persistence.
CeloHT should carefully determine where information belongs.
Appropriate for:
- Transactions
- Smart-contract state
- Verifiable blockchain events
- Certain public records
Appropriate for:
- Large documents
- Private information
- Application metadata
- Educational content
- Operational records
Users may interact with the Celo ecosystem through compatible wallets.
Wallet integrations should support secure transaction signing without exposing private keys to CeloHT.
The application should request signatures or transactions through wallet interfaces.
CeloHT should never require users to provide:
- Seed phrases
- Private keys
- Wallet passwords
The user remains responsible for approving transactions.
The agent layer can provide community-based access to digital financial services.
Conceptually:
User
↓
Local Agent
↓
CeloHT Application
↓
Celo Network
↓
Blockchain Transaction
Agents should receive appropriate training and operational guidance.
Depending on the program, agents may:
- Assist users
- Explain digital wallets
- Facilitate supported transactions
- Provide onboarding
- Support education
- Report operational issues
Agents should never request users' private keys or recovery phrases.
The education system supports:
- Financial literacy
- Blockchain education
- Web3 fundamentals
- Wallet education
- Digital security
- Celo ecosystem education
Learning should be structured and measurable where practical.
A simplified model:
Learning Content
↓
Course / Lesson
↓
Quiz / Assessment
↓
Completion
↓
Learning Metrics
CeloHT's environmental component can track activities associated with reforestation.
Potential data includes:
- Planting locations
- Tree counts
- Species
- Planting dates
- Maintenance
- Survival measurements
Environmental claims should be supported by appropriate evidence.
A conceptual structure:
Project
├── Community
├── Planting Site
├── Species
├── Trees Planted
├── Maintenance
└── Survival Monitoring
APIs provide controlled communication between system components.
APIs should implement:
- Authentication
- Authorization
- Input validation
- Rate limiting
- Logging
- Error handling
Blockchain interactions may be abstracted through a service layer.
Example:
Frontend
↓
Blockchain Service
↓
Wallet Provider / RPC
↓
Celo Network
This reduces direct coupling between application components and blockchain infrastructure.
Applications may use one or more RPC providers.
Production systems should avoid unnecessary dependency on a single provider when availability requirements justify redundancy.
A relational database may be appropriate for structured application data.
Potential entities include:
Users
Agents
Courses
Lessons
Quizzes
Programs
Communities
Transactions
Events
Reports
The actual schema should be defined separately.
Authentication determines who a user is.
Potential mechanisms may include:
- Wallet-based authentication
- Traditional authentication where appropriate
- Session-based authentication
- OAuth-compatible providers where required
Authentication architecture should be documented separately.
See:
AUTHENTICATION_ARCHITECTURE.md
Authorization determines what an authenticated user may do.
Potential roles include:
- User
- Agent
- Contributor
- Administrator
- Maintainer
- Governance participant
Permissions should follow least privilege.
CeloHT governance provides mechanisms for community participation in appropriate decisions.
Governance may involve:
- Proposals
- Discussions
- Voting
- Working groups
- Governance councils
Technical architecture should not automatically grant governance authority.
Treasury systems should be separated from ordinary application logic.
A conceptual structure:
Governance / Authorized Control
↓
Treasury Controls
↓
Multisignature
↓
Digital Assets
See:
TREASURY.md
Where required, CeloHT may provide:
- Email notifications
- In-app notifications
- System alerts
- Security alerts
Notifications should not expose sensitive information unnecessarily.
Analytics may measure:
- Users
- Education
- Transactions
- Agents
- Community participation
- Program performance
- Environmental activities
Analytics systems should respect privacy requirements.
Production systems should provide appropriate:
- Logs
- Metrics
- Traces
- Alerts
- Health checks
Observability should help detect failures before they significantly affect users.
Applications should provide predictable error behavior.
Errors should:
- Avoid exposing secrets
- Provide useful user feedback
- Be logged appropriately
- Include enough diagnostic information for maintainers
Critical services should consider:
- Redundancy
- Backups
- Monitoring
- Recovery procedures
- Provider redundancy
- Graceful failure
The architecture should allow components to scale independently where necessary.
Potential scaling targets include:
- API requests
- Users
- Education content
- Agent activity
- Blockchain interactions
- Analytics workloads
Performance optimization should focus on:
- Fast page loading
- Efficient API calls
- Caching where appropriate
- Efficient database queries
- Reduced unnecessary blockchain requests
Performance should not compromise security or correctness.
Caching may be used for:
- Public content
- Static resources
- Non-sensitive API responses
- Blockchain data where appropriate
Sensitive or rapidly changing information should be handled carefully.
Security should exist across every layer:
User
↓
Authentication
↓
Authorization
↓
Application
↓
API
↓
Database / Blockchain
↓
Infrastructure
A compromise of one layer should not automatically compromise the entire system.
Infrastructure may include:
- Cloud hosting
- Web servers
- Databases
- DNS
- CDN
- CI/CD
- Monitoring systems
- Object storage
Infrastructure credentials must be protected.
A typical development flow:
Developer
↓
GitHub
↓
Pull Request
↓
Automated Tests
↓
Security Checks
↓
Review
↓
Build
↓
Deployment
Production deployment should require appropriate controls.
CeloHT benefits from open-source development.
Public repositories may contain:
- Source code
- Documentation
- Issues
- Tests
- Architecture
- Contribution guidelines
Secrets and sensitive operational information must remain private.
System components should use controlled versioning.
Versioning should allow maintainers to identify:
- Current version
- Previous version
- Changes
- Compatibility
- Deployment state
See VERSIONING.md.
Testing should occur at multiple levels:
Unit
↓
Integration
↓
End-to-End
↓
Security
↓
Production Verification
See TESTING.md.
Critical systems should have recovery procedures.
Recovery planning should consider:
- Database loss
- Infrastructure outage
- Compromised credentials
- Blockchain provider outage
- Application failure
- Data corruption
External systems may include:
- Wallet providers
- RPC providers
- Blockchain explorers
- Authentication services
- Cloud providers
- Analytics tools
Each integration introduces dependency and security considerations.
Where practical, external integrations should be isolated behind interfaces.
This allows a provider to be replaced without rewriting the entire application.
Configuration should be separated from application code where appropriate.
Different environments may include:
- Development
- Testing
- Staging
- Production
Sensitive configuration should use secure secret management.
Production credentials and infrastructure should not be casually reused in development environments.
Environment boundaries reduce accidental production impact.
A simplified transaction flow:
User
↓
CeloHT Interface
↓
Wallet
↓
Transaction Signature
↓
Celo Network
↓
Blockchain Confirmation
↓
CeloHT Application
↓
User Feedback
The application should accurately distinguish between:
- Submitted
- Pending
- Confirmed
- Failed
Important trust boundaries include:
- User ↔ Application
- Application ↔ API
- API ↔ Database
- Application ↔ Wallet
- Application ↔ Blockchain
- CeloHT ↔ Third-party services
Each boundary should have appropriate validation and authorization.
Major system components should be evaluated for threats such as:
- Unauthorized access
- Credential theft
- Data exposure
- Smart-contract exploitation
- API abuse
- Infrastructure compromise
- Phishing
- Denial of service
Threat modeling should evolve with the architecture.
CeloHT is an evolving ecosystem.
System architecture should therefore be reviewed when there are major changes in:
- Users
- Products
- Blockchain infrastructure
- Governance
- Security requirements
- Regulatory environment
- Program scope
Important architectural decisions should be documented.
A decision record may contain:
Decision
Context
Alternatives
Chosen Approach
Reason
Trade-offs
Date
This creates institutional memory for future contributors.
CeloHT should avoid unnecessary vendor lock-in where practical.
Architecture should favor portable standards and replaceable components when the cost-benefit analysis supports them.
Architecture documentation should remain synchronized with implementation.
Material architectural changes should trigger documentation updates.
This document should be read together with:
TECH_STACK.mdSECURITY.mdSMART_CONTRACTS.mdSMART_CONTRACT_SECURITY.mdAUTHENTICATION_ARCHITECTURE.mdAUTHORIZATION_MODEL.mdDATA_PRIVACY.mdENVIRONMENT_CONFIGURATION.mdTESTING.mdPERFORMANCE.mdRELEASE_PROCESS.md
CeloHT's system architecture is designed to connect people, applications, blockchain infrastructure, education, community programs, and environmental initiatives through modular and secure technology.
The architecture should evolve without losing its core principles:
Security. Transparency. Reliability. Interoperability. Community value.
The long-term objective is not simply to build more technology, but to build technology that remains understandable, maintainable, verifiable, and useful to the communities CeloHT serves.
Document Status: Active / Evolving Maintained By: CeloHT Community Primary Authors: Johnny Dubic & CeloHT Community
© 2026 CeloHT - Open Source. Global Impact. Licensed under Apache.