BiomedBERT frozen + linear probe

LIVE

The signed evidence record for biomedbert_probe. Everything below was read out of the passport file; the signature was checked when this page was built, by the same code the Verify button runs.

SIGNATURE VALIDexit 0signature valid, issued by NakedSignal under key ns-passport-2026-07, not expired

SubjectBiomedBERT frozen + linear probe biomedbert_probe

Configuration109M frozen, mean-pooled 768-d, logistic head

Code fingerprintb444c02112cc, b5b34c074f7f

Spec versionMedEval-1 v0.1

Issued2026-08-03T16:03:41Z by NakedSignal

Expires2026-09-20T00:00:00Z — the sealed held-out generation this evidence cycle is anchored to (gen2, set hash ad30d214daa285c5...) is published to expire 2026-09-20; per spec, a passport lapses when its generation retires or its spec version is superseded, whichever comes first

Tamper: edit one scorekey ns-passport-2026-07 · Ed25519

The check runs against the public key published on the governance page, using your browser's own Ed25519 implementation. The exit code shown is the exit code verify_passport.py returns for the same document.

Measured by NakedSignal

Computed in this repo by the MedEval-1 harness on data the model had never seen. Every number below was copied out of a file the harness wrote — 8 of them, each listed with its SHA-256 at the foot of this panel — and is printed exactly as it was signed, not re-rounded for display.

Task	Domain	n test	accuracy	calibration	uncertainty	subgroup	corruption	acquisition	limited data	cost	spec sensitivity	Index
jobpost_fraud	labour	4470	66.119551	92.233122	98.71977	0	86.400175	n/a	73.188489	98.91686	n/a	69.85494
ledgar	legal	10000	65.691417	32.079136	90.852472	0	90.25031	n/a	89.735758	100	n/a	61.305236
medabstracts	medicine	2888	42.165887	8.065084	55.835296	28.720083	96.75557	n/a	83.259894	100	n/a	52.2604

Cross-site retention

not measured for this subject — it is only defined within a family of tasks that share a corpus and differ in acquisition, and this model was not run on one.

Private held-out track

this subject was not submitted to a sealed generation.

Known limitations

Subgroup metadataabsent on 2 of 3 corpora, so the subgroup score falls back to the worst diagnostic class. That absence is a disclosure, not a pass.

Training set cappedyes on at least one task — see the raw JSON for which

Observed in deploymentnothing — see the third panel

Audit chain

Bundles re-derived48 of 48

Ledger100 entries, head 6b7b371ff650a8ed…, chain intact

Re-run it yourselfpython src/heldout/audit.py 1f66c7719ab3943c6fcc

8 source files, with hashes

results/heldout/audit_report.json	df460b6d91a6512dfa1e7dc650637fce2b4dd3a1ec32e03446bf6e11f9c597d2
results/heldout/cycle.json	e012b8978457b51b5c31d18d14d2cc92f100731897523306acae19934f943502
results/heldout/manifests/gen1.seal.json	91a7adfa29870a0719125cdd48f6dcb149f1f6485ac1cfa104c6e00057ad9b81
results/heldout/manifests/gen2.seal.json	f61470918a09cf39e074ef14fb7ade4ac3a13d36d9385f18cf9b92e4b5329547
results/heldout/manifests/public.seal.json	1a4fd930d2e781ac7163483990f15d6694e28e507d1b3ca009ff09395e47497c
results/records/jobpost_fraud__biomedbert_probe.json	bef0858284970bb36a8adad4d49155ac59d41ed1922bef00ebfda4993676e997
results/records/ledgar__biomedbert_probe.json	e2ac5f897970fc3592190ce178e005ad29a262a457c8e5b0356a0412651a654f
results/records/medabstracts__biomedbert_probe.json	5c15ff960852d2d31c2aacf26fec9cab1e1cceac54e3b7b0eecb1aa116f706ef

Declared by vendor

Five fields a vendor asserts about its own product — intended use, forbidden use, training cutoff, regulatory clearances, and who is personally attesting. NakedSignal never fills these in on a vendor's behalf.

No vendor declaration. This is an open reference baseline implemented by NakedSignal, not a commercial product: there is no vendor to assert an intended use or to sign an attestation, so the declared block is null rather than filled in on the vendor's behalf.

Observed in deployment

Production history and drift — how the model has actually behaved since it was deployed, on real traffic.

Not available: this requires continuous monitoring. Production history and drift are observed fields, and nothing is deployed, so there is nothing to observe. The object is present and null on purpose. The shape is the roadmap, not a claim.

Raw JSON — the whole signed document, 19,758 characters

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  "signed_over": "the whole document with the `signature` member removed, canonicalised as above and encoded UTF-8"
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   },
   {
    "path": "results/heldout/manifests/gen2.seal.json",
    "sha256": "f61470918a09cf39e074ef14fb7ade4ac3a13d36d9385f18cf9b92e4b5329547"
   },
   {
    "path": "results/heldout/manifests/public.seal.json",
    "sha256": "1a4fd930d2e781ac7163483990f15d6694e28e507d1b3ca009ff09395e47497c"
   },
   {
    "path": "results/records/jobpost_fraud__biomedbert_probe.json",
    "sha256": "bef0858284970bb36a8adad4d49155ac59d41ed1922bef00ebfda4993676e997"
   },
   {
    "path": "results/records/ledgar__biomedbert_probe.json",
    "sha256": "e2ac5f897970fc3592190ce178e005ad29a262a457c8e5b0356a0412651a654f"
   },
   {
    "path": "results/records/medabstracts__biomedbert_probe.json",
    "sha256": "5c15ff960852d2d31c2aacf26fec9cab1e1cceac54e3b7b0eecb1aa116f706ef"
   }
  ]
 },
 "declared": null,
 "declared_note": "No vendor declaration. This is an open reference baseline implemented by NakedSignal, not a commercial product: there is no vendor to assert an intended use or to sign an attestation, so the declared block is null rather than filled in on the vendor's behalf.",
 "expiry_basis": "the sealed held-out generation this evidence cycle is anchored to (gen2, set hash ad30d214daa285c5...) is published to expire 2026-09-20; per spec, a passport lapses when its generation retires or its spec version is superseded, whichever comes first",
 "expiry_utc": "2026-09-20T00:00:00Z",
 "issued_utc": "2026-08-03T16:03:41Z",
 "issuer": {
  "algo": "Ed25519",
  "key_id": "ns-passport-2026-07",
  "name": "NakedSignal",
  "public_key_b64": "0PBCC6mjzcppR5QdPcK7vP/AamB6MP8l1T4ypMYbsMw="
 },
 "observed": null,
 "observed_note": "Not available: this requires continuous monitoring. Production history and drift are observed fields, and nothing is deployed, so there is nothing to observe. The object is present and null on purpose. The shape is the roadmap, not a claim.",
 "passport_version": "0.1",
 "signature": "iXjRxrULUh/kHz/gZ51laDSS/K7kQbIZl4Rb4zqqZfvXCTzBm3vp+acEF2Rc7GPlzOQVGyMuzNCiGGc8qlYdAQ==",
 "spec_version": "MedEval-1 v0.1",
 "subject": {
  "behaviour_version": "1.0.0",
  "code_fingerprint": null,
  "code_fingerprints": [
   "b444c02112cc",
   "b5b34c074f7f"
  ],
  "family": "foundation",
  "model_id": "biomedbert_probe",
  "model_name": "BiomedBERT frozen + linear probe",
  "params": "109M frozen, mean-pooled 768-d, logistic head"
 }
}

Canonicalisation: RFC 8785 (JCS)-compatible: UTF-8, object keys sorted by code point, no insignificant whitespace, ECMAScript number formatting. every float is rounded once at emit to 6 decimal places (Python round(), banker's rounding); integers are left exact. Signed over the whole document with the `signature` member removed, canonicalised as above and encoded UTF-8. The public key for ns-passport-2026-07 is 0PBCC6mjzcppR5QdPcK7vP/AamB6MP8l1T4ypMYbsMw= — see Governance.

← baseline_only_ancova_adAll 42 passportsbiomedclip_ft →

This document

model: biomedbert_probe
spec: MedEval-1 v0.1
issued: 2026-08-03
expires: 2026-09-20
key: ns-passport-2026-07
evaluations: 3

Check it yourself

cd plan_d
python src/verify_passport.py \
  ../site-data/passports/biomedbert_probe.json

Exit 0 at this build. Or drop the file on the evidence check and watch a browser do it.