technical-specification.md

Humanity Coin Technical Specification

1. Blockchain Architecture

1.1 Core Components

1.1.1 Node Architecture

• Modular Design
  • Core Module: Transaction processing and state management
  • Consensus Module: Hybrid PoR-RBFT implementation
  • Network Module: P2P communication and data propagation
  • Storage Module: Blockchain data and state storage
  • API Module: External interfaces and RPC endpoints

1.1.2 Data Structures

• Block Structure

  struct Block {
      header: BlockHeader,
      transactions: Vec<Transaction>,
      validator_signatures: Vec<Signature>,
      reputation_updates: Vec<ReputationChange>
  }
  
  struct BlockHeader {
      version: u32,
      previous_hash: Hash,
      timestamp: u64,
      merkle_root: Hash,
      validator_set_hash: Hash,
      state_root: Hash
  }

• Transaction Structure

  struct Transaction {
      version: u32,
      sender: Address,
      recipient: Address,
      amount: u64,
      nonce: u64,
      signature: Signature,
      timestamp: u64
  }

1.2 Consensus Implementation

1.2.1 Proof of Reputation (PoR)

struct ReputationScore {
    base_score: u32,
    contribution_multiplier: f32,
    time_decay_factor: f32,
    verification_count: u32
}

fn calculate_reputation(score: ReputationScore) -> u32 {
    let time_adjusted = score.base_score as f32 * score.time_decay_factor;
    let contribution_adjusted = time_adjusted * score.contribution_multiplier;
    min(contribution_adjusted as u32, MAX_REPUTATION_SCORE)
}

1.2.2 Validator Selection

struct ValidatorSet {
    epoch: u64,
    validators: Vec<Validator>,
    total_reputation: u64
}

struct Validator {
    address: Address,
    reputation_score: u32,
    last_active: u64
}

fn select_validators(set: ValidatorSet, count: u32) -> Vec<Validator> {
    // Weighted random selection based on reputation scores
    // Returns a subset of validators for the current block
}

1.3 Identity Verification System

1.3.1 Zero-Knowledge Proof Implementation

struct IdentityProof {
    public_key: PublicKey,
    biometric_hash: Hash,
    proof: ZKProof,
    verifier_signatures: Vec<Signature>
}

fn verify_identity(proof: IdentityProof) -> Result<bool, Error> {
    // Verify zero-knowledge proof
    // Check verifier signatures
    // Validate against duplicate prevention system
}

2. Smart Contract System

2.1 Core Contracts

2.1.1 Identity Registry Contract

contract IdentityRegistry {
    struct Identity {
        address wallet;
        bytes32 identityHash;
        uint256 reputationScore;
        uint256 lastActive;
        address[] verifiers;
    }
    
    mapping(address => Identity) public identities;
    mapping(bytes32 => bool) public usedBiometricHashes;
    
    function registerIdentity(
        bytes32 _identityHash,
        bytes memory _proof
    ) external {
        require(!usedBiometricHashes[_identityHash], "Identity exists");
        // Verify proof and register identity
    }
}

2.1.2 Reputation Management Contract

contract ReputationSystem {
    struct ReputationData {
        uint256 score;
        uint256 lastUpdate;
        mapping(string => uint256) contributions;
    }
    
    mapping(address => ReputationData) public reputationScores;
    
    function updateReputation(
        address _user,
        string memory _contributionType,
        uint256 _value
    ) external onlyValidator {
        // Update reputation based on contribution
        // Apply time decay
        // Enforce maximum limits
    }
}

3. Network Architecture

3.1 P2P Network

3.1.1 Node Discovery

struct Node {
    id: NodeId,
    address: SocketAddr,
    reputation: u32,
    capabilities: Vec<Capability>
}

fn discover_peers(bootstrap_nodes: Vec<Node>) -> Result<Vec<Node>, Error> {
    // Implement Kademlia-based node discovery
    // Filter by node capabilities and reputation
}

3.1.2 Data Propagation

struct NetworkMessage {
    message_type: MessageType,
    payload: Vec<u8>,
    signature: Signature,
    timestamp: u64
}

fn propagate_transaction(tx: Transaction) -> Result<(), Error> {
    // Implement gossip protocol
    // Validate before propagation
    // Track message propagation metrics
}

4. Security Measures

4.1 Sybil Attack Prevention

struct IdentityVerification {
    proof_of_uniqueness: ZKProof,
    verifier_threshold: u32,
    cooling_period: u64
}

fn verify_new_identity(verification: IdentityVerification) -> Result<bool, Error> {
    // Implement multi-layer verification
    // Check against known patterns
    // Enforce cooling period
}

4.2 Consensus Attack Prevention

struct ConsensusGuard {
    validator_set: ValidatorSet,
    minimum_reputation: u32,
    maximum_power: u32
}

fn validate_consensus_round(guard: ConsensusGuard) -> Result<(), Error> {
    // Check validator distribution
    // Verify reputation requirements
    // Enforce power limits
}

5. Performance Optimization

5.1 Transaction Processing

struct TransactionPool {
    pending: Vec<Transaction>,
    processing: HashMap<TxHash, TransactionStatus>,
    capacity: usize
}

fn process_transaction_batch(pool: &mut TransactionPool) -> Result<Vec<Transaction>, Error> {
    // Implement parallel validation
    // Sort by priority and reputation
    // Batch for optimal throughput
}

5.2 State Management

struct StateManager {
    current_state: StateRoot,
    state_cache: LruCache<StateKey, StateValue>,
    pending_changes: Vec<StateChange>
}

fn apply_state_changes(manager: &mut StateManager) -> Result<StateRoot, Error> {
    // Implement efficient state transitions
    // Manage cache invalidation
    // Optimize storage access
}

6. Implementation Guidelines

6.1 Development Stack

• Core Blockchain: Rust
• Smart Contracts: Solidity
• API Layer: GraphQL
• Client Libraries: TypeScript

6.2 Testing Requirements

• Unit tests for all core components
• Integration tests for network interactions
• Stress testing for consensus mechanism
• Security audits for smart contracts
• Performance benchmarking suite

6.3 Deployment Strategy

1. Local testnet deployment
2. Public testnet launch
3. Security audits and penetration testing
4. Gradual mainnet rollout
5. Community node onboarding

6.4 Monitoring and Maintenance

• Network health metrics
• Validator performance tracking
• Transaction throughput monitoring
• State growth analysis
• Security incident response plan