# Proofet Atlas 0.1.0

**Status:** Prerelease
**Published:** 2026-08-25
**Known-value cutoff:** 2026-08-24
**Scope:** Digital Identity Credentials

Atlas 0.1.0 is the first immutable release of Proofet's faceted taxonomy for
classifying and evaluating digital identity credential artifacts. It defines 24
independent characteristics across intrinsic classification, declared
mechanisms, protocol context, and evaluated assurance.

## Release Contents

- [`taxonomy.md`](taxonomy.md): conceptual definitions and assurance boundaries.
- [`registry.md`](registry.md): authoritative characteristic, value, and observation registry.
- [`schemas/`](schemas/): JSON Schema Draft 2020-12 contracts for registry entries, classification assertions, assurance results, and this release manifest.
- [`manifest.json`](manifest.json): version metadata and SHA-256 digests for the release payload.

## Compatibility Boundary

Atlas codes published in 0.1.0 retain their meaning. A patch release can correct
documentation or schemas without intentionally changing those meanings. Before
1.0.0, a minor release can add, deprecate, or refine characteristics, values,
and structured observation contracts. Deprecated codes are never reused.

External identifiers remain open and literal. Atlas does not convert unknown
profiles, algorithms, media types, document types, or registry values into an
`other` bucket.

## Interpretation

The A and B groups classify intrinsic or declared properties. The C group
records checks actually performed. Classification never implies conformance,
cryptographic validity, status, trust, privacy, or fitness for purpose.

The current Proofet API implements only the subset documented in
[`../../docs/implementation_coverage.md`](../../docs/implementation_coverage.md).
Atlas 0.1.0 is therefore a taxonomy release, not a declaration that the API
already emits every registered characteristic.

## Known Limitations

- Profile coverage is bounded to the registered entries and cutoff date.
- Living external algorithm and protocol registries are referenced rather than copied.
- Structured contracts are intentionally format-neutral and do not replace family-specific conformance schemas.
- The schemas establish interchange shapes but do not encode every cross-field semantic rule described by the registry.
- No 0.1.0 API compatibility guarantee is made until an endpoint explicitly declares this Atlas release.

## Citation

Use `Proofet Atlas 0.1.0 (2026-08-25)` and, once created, the Git tag
`atlas-v0.1.0`. For reproducible use, verify the files against
[`manifest.json`](manifest.json).

## Changes

- Established stable identifiers for all A1-C9 characteristics.
- Defined closed, registered, structured, and evaluated value models.
- Registered complete closed value sets and bounded known profile/mechanism entries.
- Defined lossless handling for unknown external identifiers.
- Added common evidence and assurance boundaries.
- Added the initial versioned machine-readable schemas.