Table 21.

Blockchain validation (from Prototype).

Metric	Validation Method	Result	Limitation/Future Work
Integrity/Tampering	Full chain re-hash	100% detection	Single-node only
Replay Attack	Nonce + timestamp uniqueness	Prevented	N/A
PoW Simulation	Nonce search (default difficulty)	Functional (~ 10-50ms mining)	Basic; no economic incentives
Latency Overhead	Timed appends (local)	~ 2ms/block	Supports real-time SOC (total < 5% impact)
Scalability	100-block chain validation	Linear (~ 50ms total)	Untested > 10k blocks; multi-node needed
Consensus/Network	N/A (single-node)	Zero cost	Future: Hyperledger multi-node
Sybil/Storage Attacks	Design-level (auth planned)	Conceptual	Implement access controls
Cross-Org Sharing	Off-chain export concept	N/A	Permissioned ledger integration