To propose a blockchain-integrated privacy-preserving framework for secure electronic health record (EHR) publishing that balances privacy and analytical utility.
Key Findings:
SENTINEL-Chain achieved a privacy score of 79.9% and utility of 98.2%, with a combined score exceeding all 16 baselines by 4%-95%.
Correlation fidelity was high, with 99.9% for claim amounts, 99.6% for length of stay, 99.7% for age, and 99.1% for severity indices.
The framework demonstrated 100% resistance to record linkage attacks and a membership inference attacker advantage below the random guessing baseline.
The blockchain layer processed 9,988 transactions in 101 blocks with complete integrity verification.
Interpretation:
Limitations:
Smart contract gas estimation indicates a per-record registration cost of 61,895 gas units, which may be high without Layer-2 deployment.
