Dataset: which photo metadata survives a download
Run: 2026-09-10-viallo-metadata-survival
Measured: 10 September 2026
Published by: Viallo (Zava Solutions LLC)

Licence: CC0 1.0 Universal (public domain dedication)
https://creativecommons.org/publicdomain/zero/1.0/

You may copy, modify and redistribute this data, including for commercial
purposes, without asking and without attribution. Attribution is welcome but
not required.

Contents
  DATASET.csv         one row per fetched file, one column per measured field
  DATASET.json        run metadata, instrument calibration, per-group counts
  PREREGISTRATION.md  the question, the prediction and the rules, all fixed
                      before the first file was fetched

What the data does not contain: no image content, no coordinate values, no
serial numbers and no account names. Every field is a presence flag. Identifiers
for the Mastodon frame are salted hashes and the salt is not published, so the
rows cannot be traced back to accounts.