BlockDAG Security Deep Dive: How VeloxDAG Resists Attacks

BlockDAG protocols must answer one question: *which transactions are final?* VeloxDAG uses cumulative proof-of-work across the DAG to order blocks and resolve conflicts.

Each block must satisfy SHA256 difficulty targets. Parents must exist and be valid. Tips are tracked across parallel chains — when blocks arrive out of order, the heaviest work chain wins.

Attack vectors considered: - 51% hashrate: Expensive due to fair-launch distribution — no single entity holds genesis supply - Double spends: Require rewriting DAG work — computationally infeasible at scale - Selfish mining: Mitigated by multi-parent inclusion and tip diversity

The reference implementation includes reorg protection, mempool validation, and nonce-based transaction ordering. Security audits are planned as the network grows.

Fair launch isn't just ethics — it's security. No concentrated genesis supply means no concentrated attack surface.