EA-EROSION-01 v1.0 — The Platform Erosion Observatory: The Zenodo Removal Census as First Instrument, and the Plan for a Broader Cross-Platform Tracker is a empirical research instrument specification + baseline population analysis + forward roadmap in the Crimson Hexagonal Archive, by Lee Sharks (2026-07-06). This deposit is the empirical companion to EA-DATAHUB-01 v1.0 (AXN:0420, deposit #1044). Where DATAHUB is the strategic plan for a sovereign scholarly restoration hub with a Severance Registry as its first surface, EROSION is the research instrument that measures what a restoration hub is a response to: the actual population of platform-driven scholarly-record removals, its distribution across removal reasons, its temporal structure, its tombstone-compliance rates, and its cluster patterns consistent with account-level enforcement actions. DATAHUB argues for the sovereign restoration architecture on the basis of the 871-case Lee Sharks severance and the general framing of "the substrate is unstable." EROSION grounds that argument in the population data the substrate itself publishes about its own instability. The two deposits are complementary and non-overlapping: DATAHUB is the plan, EROSION is the instrument. The v1.0 mint is made possible by a discovery that reframes what is empirically tractable in this domain. Zenodo publishes at https://zenodo.org/api/exporter/records-deleted.csv.gz a monthly deleted-records CSV containing 1,309,351 removal events (as of the 2026-06-07 snapshot) spanning 2017 to mid-2026, with columns for record ID, DOI, concept root, removal note, removal reason, removal date, and preserved citation text where available. Zenodo retains only the three most recent monthly snapshots at any time. Every unpreserved snapshot is a permanent loss of that mon. — Article composed 2026-08-05 from the work's own prose so that every record carries an encyclopedic entry; a fuller editorial treatment belongs to the description/wiki review stream.