HashCare is the audit trail that answers that question. Every AI-assisted clinical decision in the SolvingHealth network produces a hash — a 64-character cryptographic fingerprint that proves what was said, by which model, under which physician's oversight, at what time. Tamper-evident. Permanent. OIG audit-ready from transaction one.
The accountability chain
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A 64-character fingerprint. Changes if a single character in the record changes. Proves the document existed, unmodified, at that exact timestamp.
Try to break it
Here is a single care event — a caregiver's visit note, sealed with a real SHA-256 hash the moment it was signed. Change one character and watch the fingerprint break. A family or a payer can run this same check and know, instantly, whether a record is the one the caregiver actually signed.
Sealed by the caregiver at sign-off. Edit any field below to simulate an after-the-fact change to the record.
This runs entirely in your browser using the Web Crypto API (SHA-256) — nothing is uploaded. In production, the sign-off hash is anchored to immutable storage with a 7-year object lock, so the comparison can be made by anyone, years later, against a record no one can quietly rewrite.
Interactive Demo
Select the data sources to include in your identity snapshot. Your hash changes only when your underlying data changes — making it tamper-evident by design.
How It Works
From a physician attestation to a caregiver shift note — every event gets the same four-step chain. There are no exceptions and no manual overrides.
What Gets Anchored
HashCare anchors the clinical events that matter most — the ones where provenance, timing, and integrity are not optional.
When a physician reviews and attests to an AI-generated note, LMN, or prior auth, the attestation event is hashed at the moment of signing. Immutable audit trail. No retroactive edits.
Every caregiver shift note, care goal update, and clinical observation in co-op.care is anchored. Family-owned, hash-verified, and auditable by any authorized party.
ComfortCard emergency profiles are backed by a HashCare identity. Any care provider scanning the QR can verify the record is unmodified — and when it was last attested.
Letters of Medical Necessity are hashed at issuance and again at physician sign-off. The two-hash chain proves the document was not altered between generation and attestation.
When a physician attests to a DecisionIndex score, that attestation is hashed and linked to the underlying evidence record. Attestation corpus is tamper-evident and cumulative.
SurgeonValue encounter records are anchored at ingestion. Billing codes, procedural notes, and outcome data are verifiable against the original hash — no retroactive modifications.
Selective Disclosure
Consent tokens are scoped access grants. You specify who sees what, for how long, and for what purpose. They expire automatically and leave an on-chain audit trail.
For Developers
HashCare SDK handles cryptographic key management, FHIR R4 data ingestion, consent token lifecycle, and audit log maintenance — so your team can focus on clinical features, not compliance infrastructure.
Three lines to generate a health identity. One call to create a time-limited consent token. A standard webhook when a token is accessed or revoked.
Full SDK documentation// Initialize HashCare SDK const hashcare = new HashCare({ apiKey: 'hc_...' }); // Generate health identity hash const identity = await hashcare .generateHash({ sources: ['apple_health', 'epic_fhir'], includeModules: [ 'vitals', 'diagnoses', 'medications' ] }); // Create scoped consent token // (24hr, read-only, ortho data only) const token = await hashcare .createConsentToken({ purpose: 'pre-surgical-review', expires: '24h', scope: [ 'diagnoses.musculoskeletal', 'vitals.weight_height' ] });
SolvingHealth Ecosystem
Every attestation, care record, and identity claim in the SolvingHealth ecosystem is anchored to a HashCare hash. Cryptographic provenance from the first data point to the last.
Physician attestations are hash-anchored at the moment of signing. Immutable audit trail for every clinical review.
clinicalswipe.comDigital health identity wallet powered by HashCare. QR-accessible emergency profile. Cryptographically verified at every care touchpoint.
comfortcard.orgCare records are hash-anchored. Every caregiver shift, clinical note, and care goal — immutable and family-owned.
co-op.careEncounter logs and billing outcomes are anchored at ingestion. Verifiable, auditable, and timestamped — before they enter any downstream system.
surgeonvalue.comHashCare is opening the SDK to a select cohort of health systems and AI developers. Every attestation, LMN, and clinical note you generate through the SolvingHealth harness is anchored automatically. Join the waitlist for early access.
No spam. Early cohort is limited to 50 developers.