Fonteum Research Snapshots

How this source shows up on Fonteum.

Hosting Fonteum's own research deliverables: state-level CMS Care Compare snapshots, healthcare specialty supply studies (dermatology, chiropractor, NPPES specialty factory), and provider-supply benchmarks. Renders on /research and /press; never overwrites federal source attribution on a per-field basis.

Research and data questions this source supports.

• 01Retrieve a cryptographically attested snapshot of any Fonteum research dataset — the SHA-256 hash, witness signature, and methodology version in a single API call.
• 02Build a pipeline that tracks provenance across multiple Fonteum research studies using the snapshot chain as the integrity anchor.
• 03Validate that a Fonteum data export you received matches the published snapshot hash before ingesting it downstream.
• 04Access the full citation provenance for any Fonteum research study — source dataset, snapshot date, methodology version, and attestation signature.
• 05Integrate Fonteum research snapshots into a RAG retrieval system that requires verifiable citation lineage for healthcare data.

Dataset size: Growing snapshot chain — see fonteum.com/chain for current count

What we can’t infer from this source.

• First-party research is Fonteum's own work. It is not a substitute for the federal sources it builds on.
• Each study has its own limitations panel — the master limitation list is per-study, not source-wide.
• Datasets ship as static CSV/JSON. A query API is on the roadmap but not yet available.
• Tier — first-party research; never overwrites federal source attribution on per-field provenance.

Authority, license, refresh cadence.

What the source allows.

Free to cite with attribution and a link back to the canonical study URL (fonteum.com/research/{slug}). Datasets ship as CSV/JSON downloads — please reference the per-study limitations panel when summarizing. /press carries the canonical citation template.

What a single field looks like in the graph.

A worked example. Every field surfaced from this source carries this shape of provenance line — source · last checked · display rule · confidence (when applicable).

Official API, bulk download, and Fonteum endpoints.

Common questions about Fonteum Research.

What are Fonteum research snapshots?

Fonteum research snapshots are cryptographically attested records of the dataset state underlying each published research study. Each snapshot captures: source dataset (e.g., CMS Care Compare NH Deficiencies), snapshot date, methodology version, SHA-256 hash of the underlying data file, and an Ed25519 witness co-signature. This chain makes Fonteum's research findings independently auditable.

How does the cryptographic attestation chain work?

Each Fonteum research snapshot is attested using an Ed25519 signing key. The SHA-256 hash of the underlying data file is signed and stored in the snapshot_witness_signatures table. The chain index at fonteum.com/chain shows the full attestation history. Each subsequent snapshot links to prior snapshot hashes, creating a tamper-evident audit trail.

What is an in-toto witness signature?

An in-toto witness signature is a supply-chain integrity primitive that certifies a transformation step (ingestion, normalization, publication) in a software supply chain. Fonteum applies Ed25519 in-toto co-signatures to each research snapshot to certify that the published dataset is the authentic output of the documented ingest pipeline — not a post-hoc modification.

Where can I access Fonteum's snapshot audit chain?

The full snapshot chain index is available at fonteum.com/chain. Each entry shows the source, snapshot date, SHA-256 hash, and witness signature. The public key for signature attestation is published at fonteum.com/chain-public-key.json. Per-snapshot API access is available at the /api/v1/ snapshots endpoint.

What research studies does Fonteum publish?

Fonteum publishes federal-data research studies including: Nursing Home Deficiency and Harm Rate (418,148 citations, 14,635 facilities), MIPS Score Distribution by Specialty 2023 (477,137 clinician scores), Hospital Margin Gap, NSA Compliance Scoring, REAL Act Compliance, and Provider Directory Accuracy Index (51 states). All studies are at fonteum.com/research.

Where this source already shows up.

Research studies citing this source

• Nursing Home Quality by State 2026 — CMS Care Compare State-Level Snapshot →
• Home Health Quality by State 2026 — CMS Care Compare State-Level Snapshot →
• Dermatology Access and Practice Density Report 2026 — Indexed Practice Coverage Across the United States →

Related sources in the graph

• /sources/nppes →
• /sources/cms-care-compare →
• /sources/oig-leie →

• /sources → The full source library — every dataset Fonteum cites.
• /data-provenance → The provider graph — pipeline diagram, source-family clusters, field-level provenance examples, display rules.
• /methodology → Network-wide sourcing, refresh cadence, and corrections policy.
• /editorial-policy → Independence, sourcing, conflicts, corrections, retractions.