Atoms - build: weekly fingerprints of the study records

Each week, atomsapp LLC computes a SHA-256 fingerprint of the study records that the preregistered analysis (https://osf.io/5qgtz, and its successor [NEW REGISTRATION LINK]) reads for the Atoms - build application, and publishes it here. The records themselves are never published; individual members are not identifiable from this file. What the file shows. fingerprints-build.csv has one row per week with five columns: week, app, sha256, previous_sha256 and a last column naming the OpenTimestamps server that holds an independent timestamp proof of that week's fingerprint. Each row's previous_sha256 is the prior week's sha256, so the file forms a chain. What it proves. A study record was not edited, removed or back-dated after the first weekly fingerprint that contains it. What it does not prove. That a record was genuine when first written, or how the matching model works. The model stays private; this file lets a reviewer check the records without seeing it. Versions. Each week the file is published as a new dated version of this record. Earlier versions cannot be changed, and every earlier week stays in the file. Fingerprints for 2026-09-27 to 2026-10-18 were first published on https://osf.io/ecbyd, which becomes read-only on 19 February 2027; those copies stay there unchanged.