How Blockchain Technology Can Revolutionize Healthcare Data Cybersecurity

Arpna Aggarwal is an AI-enabled cybersecurity and risk mitigation expert in the Healthcare sector.

Late last year, a major breach involving New Era Life Insurance Companies affected the protected health information (PHI) of more than 335,000 individuals. The root cause of the data breach was a cybercriminal’s unauthorized access to its IT network. The exposed data of policyholders, agents, and insurance carrier partners included names, birth dates, insurance ID numbers, claim information (including diagnosis/treatment details) and Social Security numbers.

Blockchain’s decentralized architecture, cryptographic security and automated governance would have either drastically reduced or prevented the attack. Here’s a look at how blockchain could have avoided unauthorized data exfiltration by eliminating centralized data repositories, enforcing granular access controls and enabling real-time anomaly detection.

Decentralized Data Storage

New Era’s centralized data storage created a single point of failure, enabling hackers to exfiltrate sensitive customer data over a nine-day period.

Solution

Distributed Ledger Technology (DLT) Eliminates Single Points Of Failure (Preventive Control): Patient data stored on a blockchain ledger would require consensus from multiple nodes to alter records, preventing unauthorized changes. Hackers cannot overwrite data without network-wide validation, even if they breach one node.

Encrypted Fragmentation (Preventive Control): Data is divided into fragments using algorithms like Reed-Solomon. For example, a patient’s Social Security number could be split into 10 shards, requiring six to reconstruct. Authorized collaborators can access specific fragments without exposing decryption keys, ensuring secure sharing while maintaining privacy.

Immutable Audit Trails

The delay in detecting the breach at New Era highlights critical gaps in legacy systems: centralized logging, reactive monitoring and opaque audit trails. Companies can shift to a proactive security posture by integrating blockchain-powered logging and AI-driven anomaly detection.

Solution

Real-Time Tamper-Proof Logging (Detective Control): Every data access, modification or transfer is recorded on a permissioned blockchain (e.g., hyperledger fabric). This creates an unalterable, time-stamped ledger, ensuring attackers cannot delete or modify logs.

For example: A hacker attempting to erase their tracks would fail, as blockchain’s cryptographic hashing would expose discrepancies across nodes.

Transparent Accountability (Detective Control): Insurers, auditors and regulators can access the blockchain ledger in real time to verify compliance, trace breach origins and validate remediation steps.

Smart Contracts For Access Control

Weak access controls and delayed threat detection highlight the urgent need for smart contracts and AI-driven monitoring. Insurers can enforce granular access policies and automate real-time responses to suspicious activity.

Solution

Dynamic Access Control (Preventive Control): Smart contracts codify role-based permissions (RBAC) into binding policies. For example:

Policyholder-Approved Access: Patients preauthorize specific providers to access their medical records only during active claims.

Time-Bound Permissions: Claims adjusters lose access automatically after 30 days unless reauthorized, preventing prolonged exposure.

Automated Threat Response With AI Tools (Detective Control): AI tools monitor blockchain logs for patterns, such as bulk data copying. Smart contracts execute predefined responses upon detecting anomalies, such as freezing compromised accounts and revoking token approvals.

Decentralized Identity Management

There are systemic vulnerabilities in traditional identity management such as centralized SSN and insurance ID databases. By adopting Self-Sovereign Identity (SSI), insurers can eliminate centralized data silos and mitigate breach impacts.

Solution

Decentralized Identifiers (DIDs) (Preventive Control): Policyholders generate unique, blockchain-anchored DIDs to replace SSNs/insurance IDs. These DIDs are cryptographically secure and controlled solely by the user. Since there is no centralized database, hackers cannot steal bulk SSNs/IDs, as data is decentralized and encrypted. Also, only necessary information is shared (e.g., proof of residency without an address), minimizing exposure.

Secure Data Sharing With Partners

This breach also affected the partners by exposing sensitive data from Boston Mutual, underscoring the risks of centralized data sharing. In this case, multiparty cryptographic verification and tokenized data exchange can be implemented to prevent unauthorized third-party copying and reduce exposure.

Solution

Interorganizational Consensus (Preventive Control): Partner insurers would each hold a share of a cryptographic key required to access shared data. No single entity has the whole key, eliminating single points of compromise.

Tokenized Data Exchange (Preventive Control): Replace sensitive data (e.g., policyholder IDs) with cryptographic tokens (Piiano, Fortanix) that retain the original format but hold no intrinsic value. For example, Social Security number 123-45-6789 becomes TKN-45-6789, stored in shared databases.

What The Future Holds

As of 2025, blockchain technology has seen growing yet still early-stage implementation among health insurance companies. Adoption is accelerating, with insurers increasingly piloting or deploying blockchain solutions to address persistent industry challenges; however, widespread, full-scale deployment remains limited.

Developing nations have successfully embraced blockchain technology. A prime example is the AID:Tech system for NHIF Tanzania, which serves as a case study of African insurance. Blockchain technology has prevented cyberattacks, fraud and data tampering, delivering enhanced security, transparency and operational trust across the insurance value chain.

Digital Identity on Blockchain issues NHIF members a digital identity linked to their insurance account, securely stored on a blockchain platform. This prevents unauthorized access and ensures that only verified individuals can utilize insurance services.

All transactions—encompassing policy issuance, claims and payments—are meticulously recorded on a decentralized ledger using immutable and tamper-proof records. This immutability guarantees that data remains unaltered and cannot be deleted by hackers or malicious insiders, effectively mitigating a significant cyberattack vector.

Forbes Technology Council is an invitation-only community for world-class CIOs, CTOs and technology executives. Do I qualify?