Every dated snapshot Fonteum publishes is SHA-256 hashed and attested at write time. Re-fetch the upstream source archive, run shasum -a 256, and compare to the hash on file at /verify/[snapshot_id]. A 64-character match means the bytes you read are byte-exact to what we ingested.
100 attestations on file across 12 source families. Foundation layer for the Certificate-Transparency-style attestation chain — hashes ship first, chain semantics layer on top once 30+ snapshots have accumulated.
snapshot_attestations. Verify any snapshot at /verify/[id].100 attestations on file across 12 source families.
cms_care_compare_nh 10 attestations57daa7dc…61438186attestation →Live FHIR R4 API, a public SHA-256 attestation chain, and an open methodology — every Fonteum value is traceable to its federal source. The hashes above are how a verifier proves it.
cms_pos_facilities 10 attestationscms_qpp_mips_individual 10 attestationscms-hcris-hospital-2552-10 1 attestationcms-inpatient-utilization 9 attestationscms-outpatient-utilization 9 attestationscms-provider-utilization 10 attestationsnppes 10 attestationsoig_leie 10 attestationsoig-leie 1 attestationpecos_ppef 10 attestationssource_manifest 10 attestations