External Evidence Ledger

MetaHistoryBook confirmed the real reviewed Update row in the public ActivityStreams feed.

Confirmed by metahistorybook-harvester-prod; the row is real reviewed metadata evidence, not a synthetic event.

Observed types

Create, Update

Consumer

metahistorybook-harvester-prod

Next: MetaHistoryBook can optionally re-read type=Update and fetch orderedItems[0].linkedArt.id into /api/events/.

Evidence: docs/linked-art/metahistorybook-prod-harvest-evidence.md

The roadmap evidence records all three durable callbacks as verified, including MetaHistoryBook's signed production 204 callback proof.

This row reports partner-facing callback proof only; it does not close the strict Delete type-coverage lane.

Callback proof

3/3 verified

Next: Keep callback endpoints and signing secrets active while waiting for genuine Delete evidence.

Evidence: docs/roadmap-to-10.md

MetaHistoryBook verified FAIR/LOUD dataset discovery, integrity, pagination, license scope, and object-level equivalent[] reuse.

This turns dataset publication from self-verified metadata into partner-confirmed reuse evidence.

Partner

MetaHistoryBook

Object equivalents

53/54

Wikidata equivalents

47/54

Dataset version

unknown

Next: No dataset-thread action is open; keep publishing versioned exports with checksums and per-record provenance.

Evidence: artifacts/dataset-publication/metahistorybook-dataset-reuse-confirmation-2026-07-06.json

Delete remains pending genuine upstream 404/410 tombstone evidence; no synthetic Delete rows are counted.

The feed must stay empty for Delete until a real upstream disappearance is observed, recorded, deployed, and then partner-read.

Strict rule: No fake Delete rows; only real upstream 404/410 evidence can close this strict ActivityStreams lane.

Missing activity types

none

Tombstones found

0

Next: Send a Delete deploy-note only after a genuine upstream 404/410 tombstone row exists.

Evidence: artifacts/activity-syndication/activity-tombstone-scan-latest.json

The provider scan is active, but no genuine upstream tombstone has appeared yet.

This is good-faith monitoring evidence; it explains why Delete is empty without manufacturing activity.

Provider lanes

unknown

Considered records

0

Scanned targets

0

Tombstones found

0

Next: Keep the scheduled scan running; add the real Europeana API key when it arrives to replace the read-only fallback.

Evidence: artifacts/activity-syndication/activity-tombstone-scan-latest.json

30-day SLO/uptime evidence is not complete enough for strict production proof.

Reliability improves from assertion to proof only after the retained production window is clean.

SLO samples

0/30

SLO days

0/30

Uptime

unknown

Uptime days

0/30

Next: Keep collecting 30-day SLO/uptime evidence.

Evidence: artifacts/long-term-evidence/long-term-evidence-runway-latest.json

No real invoice-backed pilot evidence is recorded yet; sister-project help cannot replace commercial proof.

MetaHistoryBook can help with technical verification, but strict SaaS traction needs a real buyer, invoice reference, activation, support, KPI, retention, and margin evidence.

Strict gate

unknown

Real-world blockers

0

Next: Convert one pilot into invoice-backed production evidence.

Evidence: artifacts/review-goals/review-goals-latest.json

The live type=Update feed is reachable and contains at least one Update row.

GET /api/activity?type=Update with activity+json accept header.

HTTP

200

Duration

2072ms

totalItems

1

items

1

linkedArt.id

https://www.metamuseum.org/api/events/https%3A%2F%2Fcollectionapi.metmuseum.org%2Fpublic%2Fcollection%2Fv1%2Fobjects%2F437133%23reviewed-update-2026-07-05-measurements

URL: https://www.metamuseum.org/api/activity?limit=100&type=Update

The first Update row's linkedArt.id dereferences as a partial Linked Art event.

Expected HTTP 200, Linked Art context, entity.id matching the requested URL, _complete:false, and equivalent[].

HTTP

200

Duration

201ms

Linked Art context

yes

entity.id matches URL

yes

_complete:false

yes

equivalent[]

1

URL: https://www.metamuseum.org/api/events/https%3A%2F%2Fcollectionapi.metmuseum.org%2Fpublic%2Fcollection%2Fv1%2Fobjects%2F437133%23reviewed-update-2026-07-05-measurements

The live type=Delete feed is reachable and intentionally empty.

An empty Delete feed is acceptable until a genuine upstream 404/410 tombstone exists.

HTTP

200

Duration

847ms

totalItems

0

items

0

URL: https://www.metamuseum.org/api/activity?limit=100&type=Delete

The live dataset landing page is reachable with Linked Data media type, license link, and checksum.

Expected application/ld+json, Link rel=license, X-Metamuseum response checksum, and dataset id.

HTTP

200

Duration

1754ms

Content-Type

application/ld+json; charset=utf-8

Checksum header

present

License link

present

Dataset id

https://www.metamuseum.org/api/datasets

URL: https://www.metamuseum.org/api/datasets

The live NDJSON export is reachable with integrity headers and page content.

Expected application/x-ndjson, response checksum, Digest, export total, and at least one NDJSON row.

HTTP

200

Duration

1772ms

Content-Type

application/x-ndjson; charset=utf-8

Checksum header

present

Digest header

present

Export total

54

Rows sampled

3

URL: https://www.metamuseum.org/api/datasets/exports/records?format=ndjson&limit=3