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Verification nodes are specialized nodes that validate blocks and transactions in the Ubu-Block network. They ensure data integrity and consensus compliance.

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Overview

Verification nodes:
  • Validate incoming blocks against consensus rules
  • Verify transaction signatures and data integrity
  • Participate in network consensus
  • Help prevent invalid data from entering the blockchain
The verification node implementation is currently in development. This page will be updated as features are implemented.

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Current Status

The verification node is in early development stage. The basic structure exists at nodes/verification/src/main.rs but core functionality is not yet implemented.

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Planned Features

  • Verify block structure and format
  • Validate block hashes and previous block references
  • Check block timestamp validity
  • Ensure proper block ordering
  • Validate transaction signatures
  • Verify candidate and polling station data
  • Check vote count consistency
  • Ensure data matches electoral boundaries
  • Participate in consensus protocol
  • Vote on block validity
  • Challenge invalid submissions
  • Maintain consensus state
  • Verify electoral data consistency
  • Check candidate registration validity
  • Validate polling station assignments
  • Ensure vote totals are mathematically correct

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Prerequisites

When available, verification nodes will require:
  • Rust toolchain installed (1.70+)
  • SQLite database support
  • Network connectivity to peer nodes
  • Cryptographic key pair for node identity

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Expected Configuration

Verification nodes will likely use a configuration similar to submission nodes: 
main_db = "sqlite://data/blockchain.db"
private_db = "sqlite://data/private.db"
node_addr = "127.0.0.1:9094"

[peers]
node1 = "127.0.0.1:9090"
node2 = "127.0.0.1:9093"

[verification]
enabled = true
min_confirmations = 3
validation_timeout = 30

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Verification Rules

Verification nodes will enforce the following rules:

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Block Rules

  1. Block must reference valid previous block
  2. Block hash must be correctly calculated
  3. Block timestamp must be reasonable
  4. Block must contain valid transactions

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Electoral Data Rules

  1. Candidates must be registered for valid positions
  2. Polling stations must exist in the system
  3. Vote counts must be non-negative integers
  4. Results must match registered voters at station
  5. Candidates must belong to registered parties

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Network Rules

  1. Blocks must come from authenticated peers
  2. Duplicate blocks are rejected
  3. Fork resolution follows longest chain rule
  4. Network protocol version must match

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Development Roadmap

1
Phase 1: Basic Validation
2
  • Implement block structure validation
  • Add hash verification
  • Create validation error types
    • 3
    Phase 2: Electoral Rules
    4
  • Implement candidate validation
  • Add polling station verification
  • Create vote count checks
    • 5
    Phase 3: Consensus Integration
    6
  • Connect to consensus protocol
  • Implement voting mechanism
  • Add fork resolution
    • 7
    Phase 4: Performance Optimization
    8
  • Add validation caching
  • Optimize database queries
  • Implement parallel verification

    • ​
    Contributing

    The verification node is under active development. Contributions are welcome! 
    # Clone and navigate to verification node
cd nodes/verification

# Current structure
tree .
# .
# ├── Cargo.toml
# └── src
#     └── main.rs
    To contribute:
    1. Review the blockchain validation requirements
    2. Check the existing codebase for validation patterns
    3. Submit a pull request with your implementation
    4. Include tests for validation rules

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    Testing

    When implemented, verification nodes can be tested using: 
    # Run unit tests
cargo test

# Run with test network
cargo run --features test-network

# Validate test blockchain
cargo run -- --config test-config.toml --validate-only

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    Security Considerations

    Verification nodes play a critical role in network security. When implementing or running verification nodes:
    • Keep the node software updated
    • Use secure key storage for node identity
    • Monitor validation logs for suspicious patterns
    • Report validation failures to network operators
    • Ensure database integrity with regular backups

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    Next Steps

    Submission Node

    Learn about submission nodes

    Observer Node

    Learn about observer nodes

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    Stay Updated

    Follow the development of verification nodes:
    • Check the GitHub repository for updates
    • Join the developer community discussions
    • Subscribe to release announcements
    • Review the changelog for new features

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