{
  "node_id": "health-blockchain-interoperability-2026",
  "title": "Blockchain for Health Data Interoperability & Patient-Controlled Records (2026)",
  "domain": "Medical & Healthcare",
  "version": "1.0.0",
  "last_updated": "2026-05-20",
  "bluf": "Blockchain and distributed ledger technologies enable secure, patient-controlled health records with verifiable provenance, immutable audit trails, and selective disclosure. Governance must address data privacy (off-chain sensitive data), regulatory compliance, interoperability with FHIR, consent management on-chain, and legal recognition of blockchain records. Hybrid on/off-chain architectures are standard.",
  "paywall": {
    "status": "LOCKED",
    "unlock_cost_usd": "0.01",
    "skyfire_id": "41779894-ece2-4163-9761-b3b1b76e19b0"
  },
  "crosswalks": {
    "_available_keys": [
      "nist_framework",
      "iso_standard",
      "industry_mapping",
      "ai_overlay_2026"
    ],
    "_note": "Full crosswalk values included in vault response"
  },
  "primary_citations_count": 4
}