PEO Case 001 — T0 Enumeration of the Firenze crui.unifi Corpus

v1.0 · 2026-07-22 · Lee Sharks (Rex Fraction / Nobel Glas) · CC BY 4.0

Recovery map for the 14,284 unique DataCite DOIs formerly registered under client crui.unifi (Università degli Studi di Firenze; Firenze University Press) and abandoned by the registration-agency migration event of 2026-07-16T07:23:35Z.

The Platform Erosion Observatory tier-1 census detected the client-count collapse (14,283 → 0) between 2026-07-13 and 2026-07-20. This dataset resolves that figure to identifiers by streaming the DataCite Public Data File 2025 — a t0 snapshot frozen at 2026-01-06T20:11:59Z, approximately six months prior to the deletion — and filtering on client_id=crui.unifi. Every DOI in this enumeration currently dead-ends at https://journals.fupress.net/inactive-doi/.

Dataset name: peo-case-001-florence-fup

Version: 1.0

Generated: 2026-07-22

Source: DataCite Public Data File 2025 (10.14454/t5qb-d995)

Snapshot frozen at: 2026-01-06T20:11:59Z

Unique DOIs: 14,284 (14,282 findable + 2 registered)

DOI prefix: 10.13128

Deletion event: 2026-07-16T07:23:35Z

Governing deposits

AXN #1408 (pending mint) — primary governing deposit for this dataset
PEO Case 001 — analytic case file

Source containers

DATACITE-PUBLIC-DATA-FILE-2025 — https://datafiles.datacite.org/datafiles/public-2025/ · 108,468,906 records · 34.4 GB · CC-BY-4.0

Update-time distribution

2020: 12,717 · 2021: 1,104 · 2022: 79 · 2023: 379 · 2024: 4 · 2025: 1

Top source months (mid-2020 metadata refresh dominates):

2020-06 — 4,939 DOIs
2020-08 — 3,242 DOIs
2020-07 — 2,392 DOIs
2020-09 — 1,735 DOIs
2021-03 — 528 DOIs
2023-03 — 352 DOIs
2020-12 — 311 DOIs
2021-01 — 173 DOIs
2021-06 — 94 DOIs
2021-09 — 72 DOIs

Files

enumeration.tsv14,284 rows + header. Columns: doi, state, client_id, updated, source_month. ~1 MB.

t0-summary.jsonStructured summary of the corpus with state, prefix, update-year, and source-month distributions.

MANIFEST.jsonFull manifest with provenance, extraction method, and data-quality notes.

Data quality notes

Two DOIs in the corpus (10.13128/10.13128/ahs-23289, 10.13128/10.13128/rea-25108) embed the 10.13128 prefix a second time inside the suffix. They resolve as valid DataCite identifiers in the T0 snapshot and are preserved unaltered in the enumeration.

Reconciliation with tier-1 census

The tier-1 census (2026-07-13) counted 14,283 findable DOIs under this client — one below this enumeration's findable count of 14,282, consistent with a single state transition in the six-month interval between the T0 snapshot and the tier-1 census. The +2 relative to tier-1 comes from the two registered-state DOIs, which DataCite's client-count APIs generally do not surface.